1
|
Draz U, Di Bartolomeo E, Panunzi AP, Pasqual Laverdura U, Lisi N, Chierchia R, Duranti L. Copper-Enhanced CO 2 Electroreduction in SOECs. ACS APPLIED MATERIALS & INTERFACES 2024; 16:8842-8852. [PMID: 38334118 DOI: 10.1021/acsami.3c17766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
The development of a Co-free and Ni-free electrocatalyst for carbon dioxide electrolysis would be a turning point for the large-scale commercialization of solid-oxide electrolysis cells (CO2-SOECs). Indeed, the demand for cobalt and nickel is expected to become critical by 2050 due to automotive electrification. Currently, the reference materials for CO2-SOEC electrodes are perovskite oxides containing Mn or Co (anodes) and Ni-YSZ cermets (cathodes). However, issues need to be addressed, such as structural degradation and/or carbon deposition at the cathode side, especially at high overpotentials. This work designs the 20 mol % replacement of iron by copper in La0.6Sr0.4FeO3-δ as a multipurpose electrode for CO2-SOECs. La0.6Sr0.4Fe0.8Cu0.2O3-δ (LSFCu) is synthesized by the solution combustion method, and iron partial substitution with copper is evaluated by X-ray powder diffraction with Rietveld refinement, X-ray photoelectron spectroscopy, thermogravimetric analyses, and electrical conductivity assessment. LSFCu is tested as the SOEC anode by measuring the area-specific resistance versus T and pO2. LSFCu structural, electrical, and electrocatalytic properties are also assessed in pure CO2 for the cathodic application. Finally, the proof of concept of a symmetric LSFCu-based CO2-SOEC is tested at 850 °C, revealing a current density value at 1.5 V of 1.22 A/cm2, which is remarkable when compared to similar Ni- or Co-containing systems.
Collapse
Affiliation(s)
- Umer Draz
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Elisabetta Di Bartolomeo
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Anna Paola Panunzi
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
| | | | - Nicola Lisi
- ENEA C.R. Casaccia, Via Anguillarese 301, S.M. di Galeria, 0123 Roma, Italy
| | - Rosa Chierchia
- ENEA C.R. Casaccia, Via Anguillarese 301, S.M. di Galeria, 0123 Roma, Italy
| | - Leonardo Duranti
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
| |
Collapse
|
2
|
Stramaglia F, Panchal G, Nolting F, Vaz CAF. Fully Magnetically Polarized Ultrathin La 0.8Sr 0.2MnO 3 Films. ACS APPLIED MATERIALS & INTERFACES 2024; 16:4138-4149. [PMID: 38216138 PMCID: PMC10811626 DOI: 10.1021/acsami.3c14031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 12/18/2023] [Accepted: 12/18/2023] [Indexed: 01/14/2024]
Abstract
We report the observation of fully magnetically polarized ultrathin La0.8Sr0.2MnO3 films by using LaMnO3 and La0.45Sr0.55MnO3 buffer layers grown epitaxially on SrTiO3(001) substrates by molecular beam epitaxy. Specifically, we show that La0.8Sr0.2MnO3 films grown on 12-unit-cell LaMnO3 have bulk-like magnetic moments starting from a single unit cell thickness, while for the 15-unit-cell La0.45Sr0.55MnO3 buffer layer, the La0.8Sr0.2MnO3 transitions from an antiferromagnetic state to a fully spin-polarized ferromagnetic state at 4 unit cells. The magnetic results are confirmed by X-ray magnetic circular dichroism, while linear dichroic measurements carried out for the La0.8Sr0.2MnO3/La0.45Sr0.55MnO3 series show the presence of an orbital reorganization at the transition from the antiferromagnetic to ferromagnetic state corresponding to a change from a preferred in-plane orbital hole occupancy, characteristic of the A-type antiferromagnetic state of La0.45Sr0.55MnO3, to preferentially out of plane. We interpret our findings in terms of the different electronic charge transfers between the adjacent layers, confined to the unit cell in the case of insulating LaMnO3 and extended to a few unit cells in the case of conducting La0.45Sr0.55MnO3. Our work demonstrates an approach to growing ultrathin mixed-valence manganite films that are fully magnetically polarized from the single unit cell, paving the way to fully exploring the unique electronic properties of this class of strongly correlated oxide materials.
Collapse
Affiliation(s)
| | - Gyanendra Panchal
- Swiss Light Source, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Frithjof Nolting
- Swiss Light Source, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Carlos A. F. Vaz
- Swiss Light Source, Paul Scherrer Institut, Villigen 5232, Switzerland
| |
Collapse
|
3
|
Marelli E, Lyu J, Morin M, Leménager M, Shang T, Yüzbasi NS, Aegerter D, Huang J, Daffé ND, Clark AH, Sheptyakov D, Graule T, Nachtegaal M, Pomjakushina E, Schmidt TJ, Krack M, Fabbri E, Medarde M. Cobalt-free layered perovskites RBaCuFeO 5+δ (R = 4f lanthanide) as electrocatalysts for the oxygen evolution reaction. EES CATALYSIS 2024; 2:335-350. [PMID: 38222064 PMCID: PMC10782807 DOI: 10.1039/d3ey00142c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 10/30/2023] [Indexed: 01/16/2024]
Abstract
Co-based perovskite oxides are intensively studied as promising catalysts for electrochemical water splitting in an alkaline environment. However, the increasing Co demand by the battery industry is pushing the search for Co-free alternatives. Here we report a systematic study of the Co-free layered perovskite family RBaCuFeO5+δ (R = 4f lanthanide), where we uncover the existence of clear correlations between electrochemical properties and several physicochemical descriptors. Using a combination of advanced neutron and X-ray synchrotron techniques with ab initio DFT calculations we demonstrate and rationalize the positive impact of a large R ionic radius in their oxygen evolution reaction (OER) activity. We also reveal that, in these materials, Fe3+ is the transition metal cation the most prone to donate electrons. We also show that similar R3+/Ba2+ ionic radii favor the incorporation and mobility of oxygen in the layered perovskite structure and increase the number of available O diffusion paths, which have an additional, positive impact on both, the electric conductivity and the OER process. An unexpected result is the observation of a clear surface reconstruction exclusively in oxygen-rich samples (δ > 0), a fact that could be related to their superior OER activity. The encouraging intrinsic OER values obtained for the most active electrocatalyst (LaBaCuFeO5.49), together with the possibility of industrially producing this material in nanocrystalline form should inspire the design of other Co-free oxide catalysts with optimal properties for electrochemical water splitting.
Collapse
Affiliation(s)
- Elena Marelli
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
- Electrochemistry Laboratory, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Jike Lyu
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Mickaël Morin
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
- Excelsus Structural Solutions (Swiss) AG, PARK InnovAARE CH-5234 Villigen PSI Switzerland
| | - Maxime Leménager
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Tian Shang
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
- Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University Shanghai China
| | - N Sena Yüzbasi
- High Performance Ceramics, EMPA, Swiss Federal Laboratories for Materials Science and Technology CH-8600 Dübendorf Switzerland
| | - Dino Aegerter
- Electrochemistry Laboratory, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Jinzhen Huang
- Electrochemistry Laboratory, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Niéli D Daffé
- Laboratory for Condensed Matter, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Adam H Clark
- Laboratory for Synchrotron Radiation and Femtochemistry, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Denis Sheptyakov
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Thomas Graule
- High Performance Ceramics, EMPA, Swiss Federal Laboratories for Materials Science and Technology CH-8600 Dübendorf Switzerland
| | - Maarten Nachtegaal
- Laboratory for Synchrotron Radiation and Femtochemistry, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Ekaterina Pomjakushina
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Thomas J Schmidt
- Electrochemistry Laboratory, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
- Laboratory of Physical Chemistry, ETH Zürich CH-8093 Zürich Switzerland
| | - Matthias Krack
- Laboratory for Materials Simulations, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Emiliana Fabbri
- Electrochemistry Laboratory, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| | - Marisa Medarde
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut CH-5232 Villigen PSI Switzerland
| |
Collapse
|
4
|
Feng M, Ahlm N, Sasaki DY, Chiu IT, N’Diaye AT, Shafer P, Klewe C, Mehta A, Takamura Y. Tuning In-Plane Magnetic Anisotropy and Interfacial Exchange Coupling in Epitaxial La 2/3Sr 1/3CoO 3/La 2/3Sr 1/3MnO 3 Heterostructures. ACS APPLIED MATERIALS & INTERFACES 2023; 15. [PMID: 37910813 PMCID: PMC10658449 DOI: 10.1021/acsami.3c10376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Revised: 09/18/2023] [Accepted: 10/16/2023] [Indexed: 11/03/2023]
Abstract
Controlling the in-plane magnetocrystalline anisotropy and interfacial exchange coupling between ferromagnetic (FM) layers plays a key role in next-generation spintronic and magnetic memory devices. In this work, we explored the effect of tuning the magnetocrystalline anisotropy of La2/3Sr1/3CoO3 (LSCO) and La2/3Sr1/3MnO3 (LSMO) layers and the corresponding effect on interfacial exchange coupling by adjusting the thickness of the LSCO layer (tLSCO). The epitaxial LSCO/LSMO bilayers were grown on (110)o-oriented NdGaO3 (NGO) substrates with a fixed LSMO (top layer) thickness of 6 nm and LSCO (bottom layer) thicknesses varying from 1 to 10 nm. Despite the small difference (∼0.2%) in lattice mismatch between the two in-plane directions, [001]o and [11̅0]o, a pronounced in-plane magnetic anisotropy was observed. Soft X-ray magnetic circular dichroism hysteresis loops revealed that for tLSCO ≤ 4 nm, the easy axes for both LSCO and LSMO layers were along the [001]o direction, and the LSCO layer was characterized by magnetically active Co2+ ions that strongly coupled to the LSMO layer. No exchange bias effect was observed in the hysteresis loops. In contrast, along the [11̅0]o direction, the LSCO and LSMO layers displayed a small difference in their coercivity values, and a small exchange bias shift was observed. As tLSCO increased above 4 nm, the easy axis for the LSCO layer remained along the [100]o direction, but it gradually rotated to the [11̅0]o direction for the LSMO layer, resulting in a large negative exchange bias shift. Therefore, we provide a way to control the magnetocrystalline anisotropy and exchange bias by tuning the interfacial exchange coupling between the two FM layers.
Collapse
Affiliation(s)
- Mingzhen Feng
- Department
of Materials Science and Engineering, University
of California, Davis, Davis, California 95616, United States
| | - Nolan Ahlm
- Department
of Materials Science and Engineering, University
of California, Davis, Davis, California 95616, United States
| | - Dayne Y. Sasaki
- Department
of Materials Science and Engineering, University
of California, Davis, Davis, California 95616, United States
| | - I-Ting Chiu
- Department
of Chemical Engineering, University of California,
Davis, Davis, California 95616, United States
| | - Alpha T. N’Diaye
- Advanced
Light Source, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Padraic Shafer
- Advanced
Light Source, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Christoph Klewe
- Advanced
Light Source, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Apurva Mehta
- Stanford
Synchrotron Radiation Lightsource, SLAC
National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Yayoi Takamura
- Department
of Materials Science and Engineering, University
of California, Davis, Davis, California 95616, United States
| |
Collapse
|
5
|
Sha Z, Kerherve G, van Spronsen MA, Wilson GE, Kilner JA, Held G, Skinner SJ. Studying Surface Chemistry of Mixed Conducting Perovskite Oxide Electrodes with Synchrotron-Based Soft X-rays. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:20325-20336. [PMID: 37876977 PMCID: PMC10591506 DOI: 10.1021/acs.jpcc.3c04278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 09/18/2023] [Indexed: 10/26/2023]
Abstract
A fundamental understanding of the electrochemical reactions and surface chemistry at the solid-gas interface in situ and operando is critical for electrode materials applied in electrochemical and catalytic applications. Here, the surface reactions and surface composition of a model of mixed ionic and electronic conducting (MIEC) perovskite oxide, (La0.8Sr0.2)0.95Cr0.5Fe0.5O3-δ (LSCrF8255), were investigated in situ using synchrotron-based near-ambient pressure (AP) X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine-structure spectroscopy (NEXAFS). The measurements were conducted with a surface temperature of 500 °C under 1 mbar of dry oxygen and water vapor, to reflect the implementation of the materials for oxygen reduction/evolution and H2O electrolysis in the applications such as solid oxide fuel cell (SOFC) and electrolyzers. Our direct experimental results demonstrate that, rather than the transition metal (TM) cations, the surface lattice oxygen is the significant redox active species under both dry oxygen and water vapor environments. It was proven that the electron holes formed in dry oxygen have a strong oxygen character. Meanwhile, a relatively higher concentration of surface oxygen vacancies was observed on the sample measured in water vapor. We further showed that in water vapor, the adsorption and dissociation of H2O onto the perovskite surface were through forming hydroxyl groups. In addition, the concentration of Sr surface species was found to increase over time in dry oxygen due to Sr surface segregation, with the presence of oxygen holes on the surface serving as an additional driving force. Comparatively, less Sr contents were observed on the sample in water vapor, which could be due to the volatility of Sr(OH)2. A secondary phase was also observed, which exhibited an enrichment in B-site cations, particularly in Fe and relatively in Cr, and a deficiency in A-site cation, notably in La and relatively in Sr. The findings and methodology of this study allow for the quantification of surface defect chemistry and surface composition evolution, providing crucial understanding and design guidelines in the electrocatalytic activity and durability of electrodes for efficient conversions of energy and fuels.
Collapse
Affiliation(s)
- Zijie Sha
- Department
of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K.
| | - Gwilherm Kerherve
- Department
of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K.
| | | | - George E. Wilson
- Department
of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K.
| | - John A. Kilner
- Department
of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K.
| | - Georg Held
- Diamond
Light Source Ltd, Didcot OX11 0DE, U.K.
| | - Stephen J. Skinner
- Department
of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K.
| |
Collapse
|
6
|
Shee A, Yeh CN, Peng B, Kowalski K, Zgid D. Triple Excitations in Green's Function Coupled Cluster Solver for Studies of Strongly Correlated Systems in the Framework of Self-Energy Embedding Theory. J Phys Chem Lett 2023; 14:2416-2424. [PMID: 36856741 DOI: 10.1021/acs.jpclett.2c03616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Embedding theories became important approaches used for accurate calculations of both molecules and solids. In these theories, a small chosen subset of orbitals is treated with an accurate method, called an impurity solver, capable of describing higher correlation effects. Ideally, such a chosen fragment should contain multiple orbitals responsible for the chemical and physical behavior of the compound. Handling a large number of chosen orbitals presents a very significant challenge for the current generation of solvers used in the physics and chemistry community. Here, we develop a Green's function coupled cluster singles doubles and triples (GFCCSDT) solver that can be used for a quantitative description in both molecules and solids. This solver allows us to treat orbital spaces that are inaccessible to other accurate solvers. At the same time, GFCCSDT maintains high accuracy of the resulting self-energy. Moreover, in conjunction with the GFCCSD solver, it allows us to test the systematic convergence of computational studies. Developing the CC family of solvers paves the road to fully systematic Green's function embedding calculations in solids. In this paper, we focus on the investigation of GFCCSDT self-energies for a strongly correlated problem of SrMnO3 solid. Subsequently, we apply this solver to solid MnO showing that an approximate variant of GFCCSDT is capable of yielding a high accuracy orbital resolved spectral function.
Collapse
Affiliation(s)
- Avijit Shee
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Chia-Nan Yeh
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Bo Peng
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Karol Kowalski
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Dominika Zgid
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
7
|
Soltan S, Macke S, Ilse SE, Pennycook T, Zhang ZL, Christiani G, Benckiser E, Schütz G, Goering E. Ferromagnetic order controlled by the magnetic interface of LaNiO 3/La 2/3Ca 1/3MnO 3 superlattices. Sci Rep 2023; 13:3847. [PMID: 36890187 PMCID: PMC9995495 DOI: 10.1038/s41598-023-30814-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 03/01/2023] [Indexed: 03/10/2023] Open
Abstract
Interface engineering in complex oxide superlattices is a growing field, enabling manipulation of the exceptional properties of these materials, and also providing access to new phases and emergent physical phenomena. Here we demonstrate how interfacial interactions can induce a complex charge and spin structure in a bulk paramagnetic material. We investigate a superlattice (SLs) consisting of paramagnetic LaNiO3 (LNO) and highly spin-polarized ferromagnetic La2/3Ca1/3MnO3 (LCMO), grown on SrTiO3 (001) substrate. We observed emerging magnetism in LNO through an exchange bias mechanism at the interfaces in X-ray resonant magnetic reflectivity. We find non-symmetric interface induced magnetization profiles in LNO and LCMO which we relate to a periodic complex charge and spin superstructure. High resolution scanning transmission electron microscopy images reveal that the upper and lower interfaces exhibit no significant structural variations. The different long range magnetic order emerging in LNO layers demonstrates the enormous potential of interfacial reconstruction as a tool for tailored electronic properties.
Collapse
Affiliation(s)
- S Soltan
- Physics Department, Faculty of Science, Helwan University, Helwan, Cairo, 11798, Egypt. .,Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany. .,Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany.
| | - S Macke
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - S E Ilse
- Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany
| | - T Pennycook
- EMAT, University of Antwerp Campus Groenenborger, 2020, Antwerp, Belgium.,Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090, Vienna, Austria
| | - Z L Zhang
- Erich-Schmid-Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700, Leoben, Austria
| | - G Christiani
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - E Benckiser
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - G Schütz
- Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany
| | - E Goering
- Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany.
| |
Collapse
|
8
|
Royer L, Bonnefont A, Asset T, Rotonnelli B, Velasco-Vélez JJ, Holdcroft S, Hettler S, Arenal R, Pichon B, Savinova E. Cooperative Redox Transitions Drive Electrocatalysis of the Oxygen Evolution Reaction on Cobalt–Iron Core–Shell Nanoparticles. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Lisa Royer
- ICPEES, UMR 7515 CNRS-ECPM-Université de Strasbourg, 25, rue Becquerel, F 67087 CEDEX 2 Strasbourg, France
- IPCMS Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Strasbourg, F-67034 France
| | - Antoine Bonnefont
- Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081 CEDEX Strasbourg, France
| | - Tristan Asset
- ICPEES, UMR 7515 CNRS-ECPM-Université de Strasbourg, 25, rue Becquerel, F 67087 CEDEX 2 Strasbourg, France
| | - Benjamin Rotonnelli
- ICPEES, UMR 7515 CNRS-ECPM-Université de Strasbourg, 25, rue Becquerel, F 67087 CEDEX 2 Strasbourg, France
| | - Juan-Jesús Velasco-Vélez
- Fritz-Haber-Institute of the Max-Planck-Society, Faradayweg 4-6, 14195 Berlin, Germany
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
- ALBA Synchrotron Light Source, Cerdanyola del Vallés, Barcelona 08290, Spain
| | - Steven Holdcroft
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Simon Hettler
- Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza, Calle Pedro Cerbuna 12, 50009 Zaragoza, Spain
- Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, Calle Mariano Esquillor, 50018 Zaragoza, Spain
| | - Raul Arenal
- Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza, Calle Pedro Cerbuna 12, 50009 Zaragoza, Spain
- Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, Calle Mariano Esquillor, 50018 Zaragoza, Spain
- ARAID Foundation, 50018 Zaragoza, Spain
| | - Benoit Pichon
- IPCMS Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Strasbourg, F-67034 France
- Institut Universitaire de France, 75231 CEDEX 05 Paris, France
| | - Elena Savinova
- ICPEES, UMR 7515 CNRS-ECPM-Université de Strasbourg, 25, rue Becquerel, F 67087 CEDEX 2 Strasbourg, France
| |
Collapse
|
9
|
Bernal-Salamanca M, Herrero-Martín J, Konstantinović Z, Balcells L, Pomar A, Martínez B, Frontera C. X-ray Absorption Spectroscopy Study of Thickness Effects on the Structural and Magnetic Properties of Pr 2-δNi 1-xMn 1+xO 6-y Double Perovskite Thin Films. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:4337. [PMID: 36500960 PMCID: PMC9741309 DOI: 10.3390/nano12234337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/01/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
In this work, we report a systematic study of the influence of film thickness on the structural and magnetic properties of epitaxial thin films of Pr2-δNi1-xMn1+xO6-y (PNMO) double perovskite grown on top of two different (001)-SrTiO3 and (001)-LaAlO3 substrates by RF magnetron sputtering. A strong dependence of the structural and magnetic properties on the film thickness is found. The ferromagnetic transition temperature (TC) and saturation magnetization (Ms) are found to decrease when reducing the film thickness. In our case, the thinnest films show a loss of ferromagnetism at the film-substrate interface. In addition, the electronic structure of some characteristic PNMO samples is deeply analyzed using X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) measurements and compared with theoretical simulations. Our results show that the oxidation states of Ni and Mn ions are stabilized as Ni2+ and Mn4+, thus the ferromagnetism is mainly due to Ni2+-O-Mn4+ superexchange interactions, even in samples with poor ferromagnetic properties. XMCD results also make evident large variations on the spin and orbital contributions to the magnetic moment as the film's thickness decreases.
Collapse
Affiliation(s)
- Mónica Bernal-Salamanca
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Cerdanyola del Vallès, Spain
| | | | - Zorica Konstantinović
- Center for Solid State Physics and New Materials, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia
| | - Lluis Balcells
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Cerdanyola del Vallès, Spain
| | - Alberto Pomar
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Cerdanyola del Vallès, Spain
| | - Benjamín Martínez
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Cerdanyola del Vallès, Spain
| | - Carlos Frontera
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Cerdanyola del Vallès, Spain
| |
Collapse
|
10
|
Kagomiya I, Hirano T, Yagi Y, Kakimoto KI, Yamamoto S, Matsuda I. Surface Exchange Reaction of Mixed Conductive La 0.65Ca 0.35FeO 3-δ during Oxygen Evolution and Incorporation as Traced by Operando X-ray Photoelectron Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2022; 14:48194-48199. [PMID: 36221309 DOI: 10.1021/acsami.2c10700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
High oxygen permeability of mixed conductive La0.65Ca0.35FeO3-δ (LCF) is applicable to pure oxygen gas generators and cathodes for solid oxide fuel cells, etc.; however, lower surface exchange reactions at temperatures below 800 °C reduce permeability. To understand the microscopic surface reaction mechanism, operando soft X-ray photoelectron spectroscopy of an LCF film surface was conducted during the evolution and incorporation of oxygen. LCF film was prepared on yttria-stabilized zirconia and a current was applied throughout the film at ∼600 °C. From operando X-ray photoelectron spectra, surface oxide species involved in the surface exchange reaction obviously appeared on the film during the evolution of oxygen from the surface. The number of surface oxide species abruptly decreased during incorporation of oxygen. By applying the current from a negative to positive value, the numbers of surface oxide species and ligand holes near Fe3+ ions on the surface both significantly increased. The results infer that ligand holes in the Fe 3d-O 2p hybrid orbitals correspond to active reaction sites at which surface oxide species change to oxygen molecules. Increasing the number of active reaction sites is key to improving oxygen evolution of mixed conductive oxides.
Collapse
Affiliation(s)
- Isao Kagomiya
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Showa-Ku, Nagoya 466-8555, Japan
| | - Tomohiro Hirano
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Showa-Ku, Nagoya 466-8555, Japan
| | - Yutaro Yagi
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Showa-Ku, Nagoya 466-8555, Japan
| | - Ken-Ichi Kakimoto
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Showa-Ku, Nagoya 466-8555, Japan
| | - Susumu Yamamoto
- International Center for Synchrotron Radiation Innovation Smart, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-Ku, Sendai-Shi, Miyagi 980-8577, Japan
| | - Iwao Matsuda
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| |
Collapse
|
11
|
Yin Z, Wang J, Wang J, Li J, Zhou H, Zhang C, Zhang H, Zhang J, Shen F, Hao J, Yu Z, Gao Y, Wang Y, Chen Y, Sun JR, Bai X, Wang JT, Hu F, Zhao TY, Shen B. Compressive-Strain-Facilitated Fast Oxygen Migration with Reversible Topotactic Transformation in La 0.5Sr 0.5CoO x via All-Solid-State Electrolyte Gating. ACS NANO 2022; 16:14632-14643. [PMID: 36107149 DOI: 10.1021/acsnano.2c05243] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Modifying the crystal structure and corresponding functional properties of complex oxides by regulating their oxygen content has promising applications in energy conversion and chemical looping, where controlling oxygen migration plays an important role. Therefore, finding an efficacious and feasible method to facilitate oxygen migration has become a critical requirement for practical applications. Here, we report a compressive-strain-facilitated oxygen migration with reversible topotactic phase transformation (RTPT) in La0.5Sr0.5CoOx films based on all-solid-state electrolyte gating modulation. With the lattice strain changing from tensile to compressive strain, significant reductions in modulation duration (∼72%) and threshold voltage (∼70%) for the RTPT were observed, indicating great promotion of RTPT by compressive strain. Density functional theory calculations verify that such compressive-strain-facilitated efficient RTPT comes from significant reduction of the oxygen migration barrier in compressive-strained films. Further, ac-STEM, EELS, and sXAS investigations reveal that varying strain from tensile to compressive enhances the Co 3d band filling, thereby suppressing the Co-O hybrid bond in oxygen vacancy channels, elucidating the micro-origin of such compressive-strain-facilitated oxygen migration. Our work suggests that controlling electronic orbital occupation of Co ions in oxygen vacancy channels may help facilitate oxygen migration, providing valuable insights and practical guidance for achieving highly efficient oxygen-migration-related chemical looping and energy conversion with complex oxides.
Collapse
Affiliation(s)
- Zhuo Yin
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Jianlin Wang
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Jing Wang
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Fujian Innovation Academy, Chinese Academy of Sciences, Fuzhou, Fujian 350108, People's Republic of China
| | - Jia Li
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Houbo Zhou
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Cheng Zhang
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, People's Republic of China
| | - Hui Zhang
- School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
| | - Jine Zhang
- School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
| | - Feiran Shen
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
- Spallation Neutron Source Science Center, Dongguan 523803, People's Republic of China
| | - Jiazheng Hao
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
- Spallation Neutron Source Science Center, Dongguan 523803, People's Republic of China
| | - Zibing Yu
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Yihong Gao
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Yangxin Wang
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Spallation Neutron Source Science Center, Dongguan 523803, People's Republic of China
| | - Yunzhong Chen
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Ji-Rong Sun
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Xuedong Bai
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Jian-Tao Wang
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Fengxia Hu
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Tong-Yun Zhao
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, Jiangxi 341000, People's Republic of China
| | - Baogen Shen
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, People's Republic of China
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, Jiangxi 341000, People's Republic of China
| |
Collapse
|
12
|
Singh B, Singh P, Siddiqui S, Singh D, Gupta M. Wastewater treatment using Fe-doped perovskite manganites by photocatalytic degradation of methyl orange, crystal violet and indigo carmine dyes in tungsten bulb/sunlight. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2022.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
13
|
Fukuma R, Harada M, Zhao W, Sawamura M, Noda Y, Nakayama M, Goto M, Kan D, Shimakawa Y, Yonemura M, Ikeda N, Watanuki R, Andersen HL, D’Angelo AM, Sharma N, Park J, Byon HR, Fukuyama S, Han Z, Fukumitsu H, Schulz-Dobrick M, Yamanaka K, Yamagishi H, Ohta T, Yabuuchi N. Unexpectedly Large Contribution of Oxygen to Charge Compensation Triggered by Structural Disordering: Detailed Experimental and Theoretical Study on a Li 3NbO 4-NiO Binary System. ACS CENTRAL SCIENCE 2022; 8:775-794. [PMID: 35756387 PMCID: PMC9228563 DOI: 10.1021/acscentsci.2c00238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Indexed: 06/15/2023]
Abstract
Dependence on lithium-ion batteries for automobile applications is rapidly increasing. The emerging use of anionic redox can boost the energy density of batteries, but the fundamental origin of anionic redox is still under debate. Moreover, to realize anionic redox, many reported electrode materials rely on manganese ions through π-type interactions with oxygen. Here, through a systematic experimental and theoretical study on a binary system of Li3NbO4-NiO, we demonstrate for the first time the unexpectedly large contribution of oxygen to charge compensation for electrochemical oxidation in Ni-based materials. In general, for Ni-based materials, e.g., LiNiO2, charge compensation is achieved mainly by Ni oxidation, with a lower contribution from oxygen. In contrast, for Li3NbO4-NiO, oxygen-based charge compensation is triggered by structural disordering and σ-type interactions with nickel ions, which are associated with a unique environment for oxygen, i.e., a linear Ni-O-Ni configuration in the disordered system. Reversible anionic redox with a small hysteretic behavior was achieved for LiNi2/3Nb1/3O2 with a cation-disordered Li/Ni arrangement. Further Li enrichment in the structure destabilizes anionic redox and leads to irreversible oxygen loss due to the disappearance of the linear Ni-O-Ni configuration and the formation of unstable Ni ions with high oxidation states. On the basis of these results, we discuss the possibility of using σ-type interactions for anionic redox to design advanced electrode materials for high-energy lithium-ion batteries.
Collapse
Affiliation(s)
- Ryutaro Fukuma
- Department
of Applied Chemistry, Tokyo Denki University, 5 Senju Asahi-cho, Adachi-ku, Tokyo, Tokyo 120-8551, Japan
| | - Maho Harada
- Frontier
Research Institute for Materials Science (FRIMS), Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555, Japan
| | - Wenwen Zhao
- Department
of Applied Chemistry, Tokyo Denki University, 5 Senju Asahi-cho, Adachi-ku, Tokyo, Tokyo 120-8551, Japan
| | - Miho Sawamura
- Department
of Applied Chemistry, Tokyo Denki University, 5 Senju Asahi-cho, Adachi-ku, Tokyo, Tokyo 120-8551, Japan
| | - Yusuke Noda
- GREEN
and MaDiS/CMi, National Institute
of Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
- Department
of Information and Communication Engineering, Okayama Prefectural University, 111 Kuboki, Soja, Okayama 719-1197, Japan
| | - Masanobu Nakayama
- Frontier
Research Institute for Materials Science (FRIMS), Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555, Japan
- GREEN
and MaDiS/CMi, National Institute
of Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
- Elements
Strategy Initiative for Catalysts and Batteries, Kyoto University, f1-30
Goryo-Ohara, Nishikyo-ku, Kyoto, Kyoto 615-8245, Japan
| | - Masato Goto
- Institute
for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Daisuke Kan
- Institute
for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Yuichi Shimakawa
- Institute
for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Masao Yonemura
- High
Energy Accelerator Research Organization, Institute of Materials Structure Science, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
- Department
of Materials Structure Science, The Graduate
University for Advanced Studies, SOKENDAI, 203-1 Shirakata, Tokai, Ibaraki 319-1106, Japan
| | - Naohiro Ikeda
- Department
of Chemistry and Life Science, Yokohama
National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Ryuta Watanuki
- Elements
Strategy Initiative for Catalysts and Batteries, Kyoto University, f1-30
Goryo-Ohara, Nishikyo-ku, Kyoto, Kyoto 615-8245, Japan
- Department
of Chemistry and Life Science, Yokohama
National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Henrik L. Andersen
- School
of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | | | - Neeraj Sharma
- School
of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - Jiwon Park
- Department
of Chemistry, KAIST Institute for NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Hye Ryung Byon
- Department
of Chemistry, KAIST Institute for NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Sayuri Fukuyama
- Battery
Materials Laboratory, BASF Japan Ltd., 7-1-13 Doi-cho, Amagasaki, Hyogo 660-0083, Japan
| | - Zhenji Han
- Battery
Materials Laboratory, BASF Japan Ltd., 7-1-13 Doi-cho, Amagasaki, Hyogo 660-0083, Japan
| | - Hitoshi Fukumitsu
- Battery
Materials Laboratory, BASF Japan Ltd., 7-1-13 Doi-cho, Amagasaki, Hyogo 660-0083, Japan
| | - Martin Schulz-Dobrick
- Battery
Materials Laboratory, BASF Japan Ltd., 7-1-13 Doi-cho, Amagasaki, Hyogo 660-0083, Japan
| | - Keisuke Yamanaka
- SR
Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Hirona Yamagishi
- SR
Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Toshiaki Ohta
- SR
Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Naoaki Yabuuchi
- Elements
Strategy Initiative for Catalysts and Batteries, Kyoto University, f1-30
Goryo-Ohara, Nishikyo-ku, Kyoto, Kyoto 615-8245, Japan
- Department
of Chemistry and Life Science, Yokohama
National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
- Advanced
Chemical Energy Research Center, Yokohama
National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| |
Collapse
|
14
|
Liu X, Xie Y, Hu Z, Lin HJ, Chen CT, Dong L, Zhang Y, Wang Q, Luo SH. Tuning the structural stability and spin-glass behavior in α-MnO 2 nanotubes by Sn ion doping. Phys Chem Chem Phys 2022; 24:12300-12310. [PMID: 35545001 DOI: 10.1039/d1cp05459g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of α-Mn1-xSnxO2 was synthesized by a simple hydrothermal method to shed light on the effect of substitution. Powder X-ray diffraction and scanning electron microscopy indicated that the particle size, crystal structure and morphology of the samples did not change with an increase of the Sn content. Sn, Mn, O and K elements were all uniformly distributed in the particles, which was observed using energy-dispersive X-ray spectroscopy. However, thermogravimetric analysis showed that the structural stability increased, and an increase of the Mn oxidation state from 3.8+ to nearly 4.0+ was observed by X-ray absorption spectroscopy. Besides, 119Sn Mössbauer spectroscopy revealed that the Sn ions are all 4+ and incorporate into the lattice by replacing the Mn ions. The DC and AC magnetic susceptibility measurements down to 2 K exhibited a spin-glass phenomenon, and the freezing temperature, Tf, decreased from 44 K to 30.5 K with increasing Sn content. This indicates that increased disorder by nonmagnetic substitution results in the enhancement of the frustration in the lattice. Meanwhile, with doping of Sn4+ ions, the Curie-Weiss temperature increased, indicating enhanced antiferromagnetic interaction. Although the mixed valence of Mn3+ and Mn4+ almost disappeared, the reduction of charge disorder did not lead to the magnetic ordering in the sample. Since the Sn4+ ions are diamagnetic and have the same magnetic effect as cation vacancies in the lattice, so it is reasonable to believe that the spin-glass transition in α-MnO2 results from the cation vacancies rather than the mixture of Mn3+ and Mn4+.
Collapse
Affiliation(s)
- Xin Liu
- School of Materials Science and Engineering, Northeastern University, 110819, Shenyang, China. .,School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Qinhuangdao, 066004, China
| | - Yang Xie
- School of Materials Science and Engineering, Northeastern University, 110819, Shenyang, China. .,School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China
| | - Zhiwei Hu
- Max-Planck Institute for Chemical Physics of Solids, Nöthnitzer Str.40, 01187 Dresden, Germany.
| | - Hong-Ji Lin
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan
| | - Chien-Te Chen
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan
| | - Liang Dong
- School of Materials Science and Engineering, Northeastern University, 110819, Shenyang, China. .,School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China
| | - Yahui Zhang
- School of Materials Science and Engineering, Northeastern University, 110819, Shenyang, China. .,School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Qinhuangdao, 066004, China
| | - Qing Wang
- School of Materials Science and Engineering, Northeastern University, 110819, Shenyang, China. .,School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Qinhuangdao, 066004, China
| | - Shao-Hua Luo
- School of Materials Science and Engineering, Northeastern University, 110819, Shenyang, China. .,School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Qinhuangdao, 066004, China
| |
Collapse
|
15
|
Chaluvadi SK, Polewczyk V, Petrov AY, Vinai G, Braglia L, Diez JM, Pierron V, Perna P, Mechin L, Torelli P, Orgiani P. Electronic Properties of Fully Strained La 1-x Sr x MnO 3 Thin Films Grown by Molecular Beam Epitaxy (0.15 ≤ x ≤ 0.45). ACS OMEGA 2022; 7:14571-14578. [PMID: 35557663 PMCID: PMC9088787 DOI: 10.1021/acsomega.1c06529] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 02/04/2022] [Indexed: 06/15/2023]
Abstract
The structural, electronic, and magnetic properties of Sr-hole-doped epitaxial La1-x Sr x MnO3 (0.15 ≤ x ≤ 0.45) thin films deposited using the molecular beam epitaxy technique on 4° vicinal STO (001) substrates are probed by the combination of X-ray diffraction and various synchrotron-based spectroscopy techniques. The structural characterizations evidence a significant shift in the LSMO (002) peak to the higher diffraction angles owing to the increase in Sr doping concentrations in thin films. The nature of the LSMO Mn mixed-valence state was estimated from X-ray photoemission spectroscopy together with the relative changes in the Mn L2,3 edges observed in X-ray absorption spectroscopy (XAS), both strongly affected by doping. CTM4XAS simulations at the XAS Mn L2,3 edges reveal the combination of epitaxial strain, and different MnO6 crystal field splitting give rise to a peak at ∼641 eV. The observed changes in the occupancy of the eg and the t2g orbitals as well as their binding energy positions toward the Fermi level with hole doping are discussed. The room-temperature magnetic properties were probed at the end by circular dichroism.
Collapse
Affiliation(s)
- Sandeep Kumar Chaluvadi
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Vincent Polewczyk
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Aleksandr Yu Petrov
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Giovanni Vinai
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Luca Braglia
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | | | - Victor Pierron
- Normandie
Univ, UNICAEN, ENSICAEN, CNRS, GREYC (UMR 6072), 14000 Caen, France
| | - Paolo Perna
- IMDEA-Nanociencia, Campus de Cantoblanco, 28049 Madrid, Spain
| | - Laurence Mechin
- Normandie
Univ, UNICAEN, ENSICAEN, CNRS, GREYC (UMR 6072), 14000 Caen, France
| | - Piero Torelli
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Pasquale Orgiani
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| |
Collapse
|
16
|
Huang Y, Zhu Y, Nie A, Fu H, Hu Z, Sun X, Haw SC, Chen JM, Chan TS, Yu S, Sun G, Jiang G, Han J, Luo W, Huang Y. Enabling Anionic Redox Stability of P2-Na 5/6 Li 1/4 Mn 3/4 O 2 by Mg Substitution. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2105404. [PMID: 34961966 DOI: 10.1002/adma.202105404] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 10/12/2021] [Indexed: 06/14/2023]
Abstract
Oxygen-based anionic redox reactions have recently emerged as a lever to increase the capacity of Mn-rich layered oxide cathodes in addition to the charge compensation based on cationic redox reactions for sodium-ion batteries. Unfortunately, the irreversibility of anionic redox often aggravates irreversible structure change and poor cycling performance. Here, a stable anionic redox is achieved through substituting Na ions by Mg ions in P2-type Na0.83 Li0.25 Mn0.75 O2 . Density functional theory (DFT) calculations reveal that Mg substitution effectively decreases the oxygen chemical potential, causing an improvement in lattice oxygen stability. Moreover, at a highly desodiated state, Mg ions that remain in the lattice and interact with O 2p orbitals can decrease the undercoordinated oxygen and the nonbonded, electron-deficient O 2p states, facilitating the reversibility of oxygen redox. When cycled in the voltage range of 2.6-4.5 V where only anionic redox occurs for charge compensation, Na0.773 Mg0.03 Li0.25 Mn0.75 O2 presents a much better reversibility, giving a 4 times better cycle stability than that of Na0.83 Li0.25 Mn0.75 O2 . Experimentally, Na0.773 Mg0.03 Li0.25 Mn0.75 O2 exhibits a ≈1.1% volume expansion during sodium insertion/extraction, suggestive of a "zero-strain" cathode. Overall, the work opens a new avenue for enhancing anionic reversibility of oxygen-related Mn-rich cathodes.
Collapse
Affiliation(s)
- Yangyang Huang
- Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China
| | - Yongcheng Zhu
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan, 610065, China
| | - Anmin Nie
- State Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei, 066004, China
| | - Haoyu Fu
- Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China
| | - Zhiwei Hu
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187, Dresden, Germany
| | - Xueping Sun
- State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China
| | - Shu-Chih Haw
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Jin-Ming Chen
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Sijie Yu
- Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China
| | - Guang Sun
- Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China
| | - Gang Jiang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan, 610065, China
| | - Jiantao Han
- State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China
| | - Wei Luo
- Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China
| | - Yunhui Huang
- State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China
| |
Collapse
|
17
|
Giordano L, Akkiraju K, Jacobs R, Vivona D, Morgan D, Shao-Horn Y. Electronic Structure-Based Descriptors for Oxide Properties and Functions. Acc Chem Res 2022; 55:298-308. [PMID: 35050573 DOI: 10.1021/acs.accounts.1c00509] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
ConspectusThe transition from fossil fuels to renewable energy requires the development of efficient and cost-effective energy storage technologies. A promising way forward is to harness the energy of intermittent renewable sources, such as solar and wind, to perform (electro)catalytic reactions to generate fuels, thus storing energy in the form of chemical bonds. However, current catalysts rely on the use of expensive, rare, or geographically localized elements, such as platinum. Widespread adoption of new (electro)catalytic technologies hinges on the discovery and development of materials containing earth-abundant elements, which can efficiently catalyze an array of (electro)chemical reactions.In the context of catalysis, descriptors provide correlations between fundamental physical properties, such as the electronic structure, and the resulting catalytic activity. The use of easily accessible descriptors has proven to be a powerful method to advance and accelerate discovery and design of new catalyst materials. The position of the oxygen electronic 2p band center has been proposed to capture the basic physical properties of oxides, including oxygen vacancy formation energy, diffusion barrier of oxygen ions, and work function. Moreover, the adsorption strength of relevant reaction intermediates at the surface of oxides can be strongly correlated with the energy of the oxygen 2p states, which affects the catalytic activity of reactions, such as oxygen electrocatalysis, and oxidative dehydrogenation of organic molecules. Such descriptors for catalytic activity can be used to predict the activity of new catalysts and understand trends and behavior among different catalysts.In this Account, we discuss how the energy of the oxygen 2p states can be used as a descriptor for oxide bulk and surface chemical properties. We show how the oxide redox properties vary linearly with the position of the oxygen 2p band center with respect to the Fermi level, and we discuss how this descriptor can be expanded across different materials and structural families, including possible generalizations to compounds outside oxides. We highlight the power of the oxygen 2p band center to predict the catalytic activity of oxides. We conclude with an outlook examining under which conditions this descriptor can be applied to predict oxide properties and possible opportunities for further refining and accelerating property predictions of oxides by leveraging material databases and machine learning.
Collapse
Affiliation(s)
- Livia Giordano
- Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Karthik Akkiraju
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Ryan Jacobs
- Department of Materials Science and Engineering, University of Wisconsin−Madison, 1509 University Avenue, Madison, Wisconsin 53706, United States
| | - Daniele Vivona
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Dane Morgan
- Department of Materials Science and Engineering, University of Wisconsin−Madison, 1509 University Avenue, Madison, Wisconsin 53706, United States
| | - Yang Shao-Horn
- Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| |
Collapse
|
18
|
Filimonenkov IS, Istomin SY, Rotonnelli B, Gallet JJ, Bournel F, Antipov EV, Savinova ER, Tsirlina GA. Interfacial recharging behavior of mixed Co, Mn-based perovskite oxides. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.139257] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
19
|
Zhao J, Chen K, Li SE, Zhang Q, Wang JO, Guo EJ, Qian H, Gu L, Qian T, Ibrahim K, Fan Z, Guo H. Electronic-structure evolution of SrFeO 3-xduring topotactic phase transformation. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 34:064001. [PMID: 34740209 DOI: 10.1088/1361-648x/ac36fd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Accepted: 11/05/2021] [Indexed: 06/13/2023]
Abstract
Oxygen-vacancy-induced topotactic phase transformation between the ABO2.5brownmillerite structure and the ABO3perovskite structure attracts ever-increasing attention due to the perspective applications in catalysis, clean energy field, and memristors. However, a detailed investigation of the electronic-structure evolution during the topotactic phase transformation for understanding the underlying mechanism is highly desired. In this work, multiple analytical methods were used to explore evolution of the electronic structure of SrFeO3-xthin films during the topotactic phase transformation. The results indicate that the increase in oxygen content induces a new unoccupied state of O 2pcharacter near the Fermi energy, inducing the insulator-to-metal transition. More importantly, the hole states are more likely constrained to thedx2-y2orbital than to thed3z2-r2orbital. Our results reveal an unambiguous evolution of the electronic structure of SrFeO3-xfilms during topotactic phase transformation, which is crucial not only for fundamental understanding but also for perspective applications such as solid-state oxide fuel cells, catalysts, and memristor devices.
Collapse
Affiliation(s)
- Jiali Zhao
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Kaihui Chen
- Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, People's Republic of China
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, People's Republic of China
| | - Shi-En Li
- Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, People's Republic of China
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Jia-Ou Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Er-Jia Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Haijie Qian
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Lin Gu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Tian Qian
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Kurash Ibrahim
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Zhen Fan
- Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, People's Republic of China
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, People's Republic of China
| | - Haizhong Guo
- Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, People's Republic of China
- Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, People's Republic of China
| |
Collapse
|
20
|
Iqbal S, Mady AH, Kim YI, Javed U, Shafi PM, Nguyen VQ, Hussain I, Tuma D, Shim JJ. Self-templated hollow nanospheres of B-site engineered non-stoichiometric perovskite for supercapacitive energy storage via anion-intercalation mechanism. J Colloid Interface Sci 2021; 600:729-739. [PMID: 34051462 DOI: 10.1016/j.jcis.2021.03.147] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 03/21/2021] [Accepted: 03/26/2021] [Indexed: 11/29/2022]
Abstract
The continual increase in energy demand and inconsistent supply have attracted attention towards sustainable energy storage/conversion devices, such as electrochemical capacitors with high energy densities and power densities. Perovskite oxides have received significant attention as anion-intercalation electrode materials for electrochemical capacitors. In this study, hollow nanospheres of non-stoichiometric cubic perovskite fluorides, KNi1-xCoxF3-δ (x = 0.2; δ = 0.33) (KNCF-0.2) have been synthesized using a localized Ostwald ripening. The electrochemical performance of the non-stoichiometric perovskite has been studied in an aqueous 3 M KOH electrolyte to categorically investigate the fluorine-vacancy-mediated charge storage capabilities. High capacities up to 198.55 mA h g-1 or 714.8 C g-1 (equivalent to 1435 F g-1) have been obtained through oxygen anion-intercalation mechanism (peroxide pathway, O-). The results have been validated using ICP (inductively coupled plasma mass spectrometry) analysis and cyclic voltammetry. An asymmetric supercapacitor device has been fabricated by coupling KNCF-0.2 with activated carbon to deliver a high energy density of 40 W h kg-1 as well as excellent cycling stability of 98% for 10,000 cycles. The special attributes of hollow-spherical, non-stoichiometric perovskite (KNCF-0.2) have exhibited immense promise for their usability as anion-intercalation type electrodes in supercapacitors.
Collapse
Affiliation(s)
- Sarmad Iqbal
- School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea
| | - Amr Hussein Mady
- School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea; Petrochemical Department, Egyptian Petroleum Research Institute, Nasr City, Cairo 11727, Egypt
| | - Young-Il Kim
- Department of Chemistry, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea
| | - Umer Javed
- School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea
| | - P Muhammed Shafi
- School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea
| | - Van Quang Nguyen
- School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea
| | - Iftikhar Hussain
- Department of Mechanical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
| | - Dirk Tuma
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str. 11, 12489 Berlin, Germany
| | - Jae-Jin Shim
- School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
| |
Collapse
|
21
|
Mandal AK, Jana A, Chowdhury S, Tiwari A, Choudhary RJ, Phase DM. Mixed Mott-Hubbard and charge transfer nature of 4H-SrMnO 3thin film on Si (100). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:235501. [PMID: 33973533 DOI: 10.1088/1361-648x/abe8a3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Accepted: 02/22/2021] [Indexed: 06/12/2023]
Abstract
Room temperature electronic structure of polycrystalline 4H-SrMnO3thin film grown on Si (100) substrate has been studied using resonance photo emission spectroscopy and soft x-ray absorption spectroscopy measurements. Presence of charge transfer screen Mn 3dnLfinal state along with the 3dn-1final state at the valence band edge of 4H-SrMnO3thin film confirms that the ground state is strongly mixed between Mn 3dand O 2pstates. The estimated equivalent values of on-site Coulomb interaction energy (U) and O 2pto Mn 3d- charge transfer energy (Δ) (U≈ Δ ≈ 4.8 eV) from the combination of occupied and unoccupied spectra further confirm the intermediate Mott-Hubbard and charge transfer insulator nature of 4H-SrMnO3film. Despite having similar Mn 4+ valence state in 4H-SrMnO3and cubic SrMnO3, 4H phase is observed to reveal much higher band gap ∼1.5 eV than the cubic phase (0.3 eV), which arises due to different MnO6octahedra environment.
Collapse
Affiliation(s)
- Arup Kumar Mandal
- UGC-DAE Consortium for Scientific Research, Indore-452001, Madhya Pradesh, India
| | - Anupam Jana
- UGC-DAE Consortium for Scientific Research, Indore-452001, Madhya Pradesh, India
| | - Sourav Chowdhury
- UGC-DAE Consortium for Scientific Research, Indore-452001, Madhya Pradesh, India
| | - Achyut Tiwari
- Indian Institute of Technology (Indian School of Mines), Dhanbad-826004, Jharkhand, India
| | - R J Choudhary
- UGC-DAE Consortium for Scientific Research, Indore-452001, Madhya Pradesh, India
| | - D M Phase
- UGC-DAE Consortium for Scientific Research, Indore-452001, Madhya Pradesh, India
| |
Collapse
|
22
|
Gao R, Fernandez A, Chakraborty T, Luo A, Pesquera D, Das S, Velarde G, Thoréton V, Kilner J, Ishihara T, Nemšák S, Crumlin EJ, Ertekin E, Martin LW. Correlating Surface Crystal Orientation and Gas Kinetics in Perovskite Oxide Electrodes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2100977. [PMID: 33829572 DOI: 10.1002/adma.202100977] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 02/25/2021] [Indexed: 06/12/2023]
Abstract
Solid-gas interactions at electrode surfaces determine the efficiency of solid-oxide fuel cells and electrolyzers. Here, the correlation between surface-gas kinetics and the crystal orientation of perovskite electrodes is studied in the model system La0.8 Sr0.2 Co0.2 Fe0.8 O3 . The gas-exchange kinetics are characterized by synthesizing epitaxial half-cell geometries where three single-variant surfaces are produced [i.e., La0.8 Sr0.2 Co0.2 Fe0.8 O3 /La0.9 Sr0.1 Ga0.95 Mg0.05 O3-δ /SrRuO3 /SrTiO3 (001), (110), and (111)]. Electrochemical impedance spectroscopy and electrical conductivity relaxation measurements reveal a strong surface-orientation dependency of the gas-exchange kinetics, wherein (111)-oriented surfaces exhibit an activity >3-times higher as compared to (001)-oriented surfaces. Oxygen partial pressure ( p O 2 )-dependent electrochemical impedance spectroscopy studies reveal that while the three surfaces have different gas-exchange kinetics, the reaction mechanisms and rate-limiting steps are the same (i.e., charge-transfer to the diatomic oxygen species). First-principles calculations suggest that the formation energy of vacancies and adsorption at the various surfaces is different and influenced by the surface polarity. Finally, synchrotron-based, ambient-pressure X-ray spectroscopies reveal distinct electronic changes and surface chemistry among the different surface orientations. Taken together, thin-film epitaxy provides an efficient approach to control and understand the electrode reactivity ultimately demonstrating that the (111)-surface exhibits a high density of active surface sites which leads to higher activity.
Collapse
Affiliation(s)
- Ran Gao
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Abel Fernandez
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Tanmoy Chakraborty
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Aileen Luo
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - David Pesquera
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Catalan Institute of Nanoscience and Nanotechnology, Campus UAB, Bellaterra, Barcelona, 08193, Spain
| | - Sujit Das
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Gabriel Velarde
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Vincent Thoréton
- WPI International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, 81-0395, Japan
| | - John Kilner
- WPI International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, 81-0395, Japan
- Department of Materials, Imperial College London, London, SW72AZ, UK
| | - Tatsumi Ishihara
- WPI International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, 81-0395, Japan
| | - Slavomír Nemšák
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Ethan J Crumlin
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Elif Ertekin
- Department of Mechanical Science and Engineering, University of Illinois, Urbana-Champaign, Urbana, IL, 61801, USA
| | - Lane W Martin
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| |
Collapse
|
23
|
Heuer S, Schierholz R, Alekseev EV, Peters L, Mueller DN, Duchoň T, Vibhu V, Tempel H, de Haart LGJ, Kungl H, Eichel RA. Oxygen Nonstoichiometry and Valence State of Manganese in La 1-x Ca x MnO 3+δ. ACS OMEGA 2021; 6:9638-9652. [PMID: 33869944 PMCID: PMC8047706 DOI: 10.1021/acsomega.1c00208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 03/16/2021] [Indexed: 06/12/2023]
Abstract
Perovskites of the ABO3 type, such as LaMnO3, can be used as air electrodes in solid oxide fuel cells and electrolyzers. Their properties can be tuned by A- and B-site substitutions. The influence of La substitution by Ca on the oxygen nonstoichiometry has been investigated frequently, but the results depend highly on the synthesis and atmospheric conditions. In this work, a series of La1-x Ca x MnO3+δ (x = 0-0.5) was synthesized using conventional solid-state synthesis under an air atmosphere. The structures of the materials were studied in detail with powder X-ray diffraction. The initial oxygen nonstoichiometries were determined using thermogravimetric reduction. The samples were subsequently analyzed in terms of defect chemistry in dependence of temperature, atmosphere, and Ca content via thermogravimetric analysis. The changes in the manganese charge states were investigated by X-ray absorption near-edge spectroscopy experiments. The influence of intrinsic and extrinsic effects on the Mn-valence state of the differently Ca-substituted samples as calculated from thermogravimetric analysis and as determined directly from X-ray absorption near-edge spectroscopy is presented.
Collapse
Affiliation(s)
- Sabrina
A. Heuer
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
- Institute
of Physical Chemistry, RWTH Aachen University, Landoltweg 2, DE-52074 Aachen, Germany
| | - Roland Schierholz
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Evgeny V. Alekseev
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Lars Peters
- Institute
of Crystallography, RWTH Aachen University, Jägerstraße 17-19, DE-52066 Aachen, Germany
| | - David N. Mueller
- Peter
Grünberg Institute (PGI-6), Forschungszentrum
Jülich GmbH, Wilhelm
Johnen Straße, DE-52425 Jülich, Germany
| | - Tomáš Duchoň
- Peter
Grünberg Institute (PGI-6), Forschungszentrum
Jülich GmbH, Wilhelm
Johnen Straße, DE-52425 Jülich, Germany
| | - Vaibhav Vibhu
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Hermann Tempel
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Lambertus G. J. de Haart
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Hans Kungl
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Rüdiger-A. Eichel
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
- Institute
of Physical Chemistry, RWTH Aachen University, Landoltweg 2, DE-52074 Aachen, Germany
| |
Collapse
|
24
|
De Souza RA, Mueller DN. Electrochemical methods for determining ionic charge in solids. NATURE MATERIALS 2021; 20:443-446. [PMID: 32958883 DOI: 10.1038/s41563-020-0790-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Affiliation(s)
- Roger A De Souza
- Institute of Physical Chemistry, RWTH Aachen University, Aachen, Germany.
| | - David N Mueller
- Peter Grünberg Institute, Forschungszentrum Jülich GmbH, Jülich, Germany.
| |
Collapse
|
25
|
Localized electronic vacancy level and its effect on the properties of doped manganites. Sci Rep 2021; 11:6706. [PMID: 33758221 PMCID: PMC7988069 DOI: 10.1038/s41598-021-85945-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/28/2021] [Indexed: 11/09/2022] Open
Abstract
Oxygen vacancies are common to most metal oxides and usually play a crucial role in determining the properties of the host material. In this work, we perform ab initio calculations to study the influence of vacancies in doped manganites \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$\text {La}_{(1-\text {x})} \text {Sr}_{\text {x}} \text {MnO}_{3}$$\end{document}La(1-x)SrxMnO3, varying both the vacancy concentration and the chemical composition within the ferromagnetic-metallic range (\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$0.2\,<\,\text {x}\,<\,0.5$$\end{document}0.2<x<0.5). We find that oxygen vacancies give rise to a localized electronic level and analyse the effects that the possible occupation of this defect state can have on the physical properties of the host. In particular, we observe a substantial reduction of the exchange energy that favors spin-flipped configurations (local antiferromagnetism), which correlate with the weakening of the double-exchange interaction, the deterioration of the metallicity, and the degradation of ferromagnetism in reduced samples. In agreement with previous studies, vacancies give rise to a lattice expansion when the defect level is unoccupied. However, our calculations suggest that under low Sr concentrations the defect level can be populated, which conversely results in a local reduction of the lattice parameter. Although the exact energy position of this defect level is sensitive to the details of the electronic interactions, we argue that it is not far from the Fermi energy for optimally doped manganites (\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$\text {x}\,\sim \,1/3$$\end{document}x∼1/3), and thus its occupation could be tuned by controlling the number of available electrons, either with chemical doping or gating. Our results could have important implications for engineering the electronic properties of thin films in oxide compounds.
Collapse
|
26
|
Spectroscopic characterization of electronic structures of ultra-thin single crystal La 0.7Sr 0.3MnO 3. Sci Rep 2021; 11:5250. [PMID: 33664335 PMCID: PMC7933230 DOI: 10.1038/s41598-021-84598-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 02/18/2021] [Indexed: 11/08/2022] Open
Abstract
We have successfully fabricated high quality single crystalline La0.7Sr0.3MnO3 (LSMO) film in the freestanding form that can be transferred onto silicon wafer and copper mesh support. Using soft x-ray absorption (XAS) and resonant inelastic x-ray scattering (RIXS) spectroscopy in transmission and reflection geometries, we demonstrate that the x-ray emission from Mn 3s-2p core-to-core transition (3sPFY) seen in the RIXS maps can represent the bulk-like absorption signal with minimal self-absorption effect around the Mn L3-edge. Similar measurements were also performed on a reference LSMO film grown on the SrTiO3 substrate and the agreement between measurements substantiates the claim that the bulk electronic structures can be preserved even after the freestanding treatment process. The 3sPFY spectrum obtained from analyzing the RIXS maps offers a powerful way to probe the bulk electronic structures in thin films and heterostructures when recording the XAS spectra in the transmission mode is not available.
Collapse
|
27
|
Hsu YH, Chen PY, Tu CS, Chen CS, Anthoniappen J. Polarization-enhanced photovoltaic response and mechanisms in Ni-doped (Bi0.93Gd0.07)FeO3 ceramics for self-powered photodetector. Ann Ital Chir 2021. [DOI: 10.1016/j.jeurceramsoc.2020.10.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
28
|
Liu Y, Dou Y, Li S, Xia T, Xie Y, Wang Y, Zhang W, Wang J, Huo L, Zhao H. Synergistic Interaction of Double/Simple Perovskite Heterostructure for Efficient Hydrogen Evolution Reaction at High Current Density. SMALL METHODS 2021; 5:e2000701. [PMID: 34927891 DOI: 10.1002/smtd.202000701] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 09/02/2020] [Indexed: 06/14/2023]
Abstract
Electrocatalytic hydrogen production for industrial level requires highly active and cost-effective catalysts at large current densities. Herein A-site Ba-deficient double perovskite PrBa0.94 Co2 O5+ δ (PB0.94 C) is used as a precursor for fabricating PB0.94 C-based double/simple perovskite heterostructure (PB0.94 C-DSPH). PB0.94 C-DSPH with enhanced electrochemical surface area, more hydrophilic surface, and high conductivity ensures abundant active sites, rapid release of gas, and efficient charge transfer at high current densities. The resultant PB0.94 C-DSPH delivers the overpotential of 364 mV at a current density of 500 mA cm-2 for hydrogen evolution reaction in 1.0 m KOH solution, along with excellent long-term durability. Promisingly, the electrolyzer with PB0.94 C-DSPH cathode and NiFe-layered double hydroxide anode demonstrates high performance for overall water splitting by yielding high current density of 500 mA cm-2 at 1.93 V. Density functional theory calculations indicate that the double/simple perovskite heterostructure promotes the water adsorption, the dissociation of molecular H2 O, and the OH* desorption considerably, which controls the whole hydrogen evolution process. The proposed PB0.94 C-DSPH solves the problem of low hydrogen-evolution efficiency at high current density faced by noble metal-based catalysts in basic environment. This study may provide a route to explore high-demand elements in the earth for addressing the critical catalysts in clean-energy utilizations.
Collapse
Affiliation(s)
- Yingying Liu
- Key Laboratory of Functional Materials Chemistry, Ministry of Education, School of Chemistry, Chemical Engineering and Materials, Heilongjiang University, Harbin, 150080, P. R. China
| | - Yingnan Dou
- Key Laboratory of Functional Materials Chemistry, Ministry of Education, School of Chemistry, Chemical Engineering and Materials, Heilongjiang University, Harbin, 150080, P. R. China
| | - Shuang Li
- Key Laboratory of Functional Materials Chemistry, Ministry of Education, School of Chemistry, Chemical Engineering and Materials, Heilongjiang University, Harbin, 150080, P. R. China
| | - Tian Xia
- Key Laboratory of Functional Materials Chemistry, Ministry of Education, School of Chemistry, Chemical Engineering and Materials, Heilongjiang University, Harbin, 150080, P. R. China
| | - Ying Xie
- Key Laboratory of Functional Materials Chemistry, Ministry of Education, School of Chemistry, Chemical Engineering and Materials, Heilongjiang University, Harbin, 150080, P. R. China
| | - Yan Wang
- Key Laboratory of Automobile Materials MOE, and Electron Microscopy Center, Jilin University, Changchun, 130012, P. R. China
| | - Wei Zhang
- Key Laboratory of Automobile Materials MOE, and Electron Microscopy Center, Jilin University, Changchun, 130012, P. R. China
| | - Jingping Wang
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, P. R. China
| | - Lihuo Huo
- Key Laboratory of Functional Materials Chemistry, Ministry of Education, School of Chemistry, Chemical Engineering and Materials, Heilongjiang University, Harbin, 150080, P. R. China
| | - Hui Zhao
- Key Laboratory of Functional Materials Chemistry, Ministry of Education, School of Chemistry, Chemical Engineering and Materials, Heilongjiang University, Harbin, 150080, P. R. China
| |
Collapse
|
29
|
Lee J, Kim Y, Cho J, Ohta H, Jeen H. Overlayer deposition-induced control of oxide ion concentration in SrFe 0.5Co 0.5O 2.5 oxygen sponges. RSC Adv 2021; 11:32210-32215. [PMID: 35495523 PMCID: PMC9041705 DOI: 10.1039/d1ra06378b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 09/22/2021] [Indexed: 11/21/2022] Open
Abstract
Controlling the oxide ion (O2−) concentration in oxides is essential to develop advanced ionic devices, i.e. solid oxide fuel cells, smart windows, memory devices, energy storage devices, and so on. Among many oxides several transition metal (TM)-based perovskite oxides show high oxide ion conductivity, and their physical properties show high sensitivity to the change of the oxide ion concentration. Here, the change in the oxide ion concentration is shown through the overlayer deposition on the SrFe0.5Co0.5O2.5 (SFCO) oxygen sponge film. We grew SFCO films followed by the deposition of two kinds of complex oxide films under exactly the same growth conditions, and observed the changes in the crystal structure, valence states, and magnetic ground states. As the NSMO overlayer grows, strong evidence of oxidation at the O K edge is shown. In addition, the Fe4+ feature is revealed, and the electron valence state of Co increased from 3 to 3.25. The oxide ion concentration of SFCO changes during layer growth due to oxidation or reduction due to differences in chemical potential. The present results might be useful to develop advanced ionic devices using TM-based perovskite oxides. We form flat oxide-interfaces, i.e. manganite- and titanate-oxygen sponges, and observe peculiar oxygen transport behaviors relying on chemical potential difference at the interfaces. Oxygen transport into oxygen-sponge leads weak ferromagnetism.![]()
Collapse
Affiliation(s)
- Joonhyuk Lee
- Department of Physics, Pusan National University, Busan 46241, Korea
| | - Younghak Kim
- Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Jinhyung Cho
- Department of Physics Education, Pusan National University, Busan 46241, Korea
| | - Hiromichi Ohta
- Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0020, Japan
| | - Hyoungjeen Jeen
- Department of Physics, Pusan National University, Busan 46241, Korea
- Research Center for Dielectric and Advanced Matter Physics, Pusan National University, Busan 46241, Korea
| |
Collapse
|
30
|
Deng C, Gabriel E, Skinner P, Lee S, Barnes P, Ma C, Gim J, Lau ML, Lee E, Xiong H. Origins of Irreversibility in Layered NaNi xFe yMn zO 2 Cathode Materials for Sodium Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2020; 12:51397-51408. [PMID: 33141552 DOI: 10.1021/acsami.0c13850] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Layered NaNixFeyMnzO2 cathode (NFM) is of great interest in sodium ion batteries because of its high theoretical capacity and utilization of abundant, low-cost, environmentally friendly raw materials. Nevertheless, there remains insufficient understanding on the concurrent local environment evolution in each transition metal (TM) that largely influences the reversibility of the cathode materials upon cycling. In this work, we investigate the reversibility of TM ions in layered NFMs with varying Fe contents and potential windows. Utilizing ex situ synchrotron X-ray absorption near-edge spectroscopy and extended X-ray absorption fine structure of precycled samples, the valence and bonding evolution of the TMs are elucidated. It is found that Mn is electrochemically inactive, as indicated by the insignificant change of Mn valence and the Mn-O bonding distance. Fe is electrochemically inactive after the first five cycles. The Ni redox couple contributes most of the charge compensation for NFMs. Ni redox is quite reversible in the cathodes with less Fe content. However, the Ni redox couple shows significant irreversibility with a high Fe content of 0.8. The electrochemical reversibility of the NFM cathode becomes increasingly enhanced with the decrease of either Fe content or with lower upper charge cutoff potential.
Collapse
Affiliation(s)
- Changjian Deng
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Eric Gabriel
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Paige Skinner
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Sungsik Lee
- X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Pete Barnes
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Chunrong Ma
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Jihyeon Gim
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Miu Lun Lau
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Eungje Lee
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Hui Xiong
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- Center for Advanced Energy Studies (CAES), Idaho Falls, Idaho 83401, United States
| |
Collapse
|
31
|
Kwon O, Kim YI, Kim K, Kim JC, Lee JH, Park SS, Han JW, Kim YM, Kim G, Jeong HY. Probing One-Dimensional Oxygen Vacancy Channels Driven by Cation-Anion Double Ordering in Perovskites. NANO LETTERS 2020; 20:8353-8359. [PMID: 33111527 DOI: 10.1021/acs.nanolett.0c03516] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Visualizing the oxygen vacancy distributions is highly desirable for understanding the atomistic oxygen diffusion mechanisms in perovskites. In particular, the direct observation of the one-dimensional oxygen vacancy channels has not yet been achieved in perovskites with dual ion (i.e., cation and anion) ordering. Here, we perform atomic-resolution imaging of the one-dimensional oxygen vacancy channels and their structural dynamics in a NdBaCo2O5.5 double perovskite oxide. An in situ heating transmission electron microscopy investigation reveals the disordering of oxygen vacancy channels by local rearrangement of oxygen vacancies at the specific temperature. A density functional theory calculation suggests that the possible pathway of oxygen vacancy migration is a multistep route via Co-O and Nd-Ov (oxygen vacancy) sites. These findings could provide robust guidance for understanding the static and dynamic behaviors of oxygen vacancies in perovskite oxides.
Collapse
Affiliation(s)
- Ohhun Kwon
- Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Yong In Kim
- Department of Energy Science, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Kyeounghak Kim
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Jong Chan Kim
- Department of Materials Science and Engineering, UNIST, Ulsan, 44919, Republic of Korea
| | - Jong Hoon Lee
- UNIST Central Research Facilities (UCRF), UNIST, Ulsan 44919, Republic of Korea
| | - Sung Soo Park
- Department of Materials Science and Engineering, UNIST, Ulsan, 44919, Republic of Korea
| | - Jeong Woo Han
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Young-Min Kim
- Department of Energy Science, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Guntae Kim
- Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Hu Young Jeong
- Department of Materials Science and Engineering, UNIST, Ulsan, 44919, Republic of Korea
- UNIST Central Research Facilities (UCRF), UNIST, Ulsan 44919, Republic of Korea
| |
Collapse
|
32
|
Tyagi S, Sathe VG, Sharma G, Phase DM, Reddy VR. Strain healing of spin-orbit coupling:a cause for enhanced magnetic moment in epitaxial SrRuO 3 thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:305501. [PMID: 32217827 DOI: 10.1088/1361-648x/ab8424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Enhanced magnetic moment and coercivity in SrRuO3 thin films are significant issues for advanced technological usages and hence are researched extensively in recent times. Most of the previous reports on thin films with enhanced magnetic moment attributed it to the high spin state. Our magnetization results show high magnetic moment of 3.3 μB/Ru ion in the epitaxial thin films grown on LSAT substrate against 1.2 μB/Ru ion observed in bulk compound. Contrary to the previous reports the Ru ions are found to be in low spin state and the orbital moment is shown to be contributing significantly in the enhancement of magnetic moment. We employed x-ray absorption spectroscopy and resonant valance band spectroscopy to probe the spin state and orbital contributions in these films. The existence of strong spin-orbit coupling responsible for the de-quenching of the 4d orbitals is confirmed by the observation of the non-statistical large branching ratio at the Ru M2,3 absorption edges. X-ray magnetic circular dichroism studies performed at the Ru M2,3 edges provided direct evidence of significant contribution of orbital moment in the film grown on LSAT. The relaxation of orbital quenching by strain engineering provides a new tool for enhancing magnetic moment and strain disorder is shown to be an efficient mean to control the spin-orbit coupling.
Collapse
Affiliation(s)
- Shekhar Tyagi
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore-452001, India
| | | | | | | | | |
Collapse
|
33
|
Song J, Ning D, Bouwmeester HJM. Influence of alkaline-earth metal substitution on structure, electrical conductivity and oxygen transport properties of perovskite-type oxides La 0.6A 0.4FeO 3-δ (A = Ca, Sr and Ba). Phys Chem Chem Phys 2020; 22:11984-11995. [PMID: 32420565 DOI: 10.1039/d0cp00247j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structural evolution, electrical conductivity, oxygen nonstoichiometry and oxygen transport properties of perovskite-type oxides La0.6A0.4FeO3-δ (A = Ca, Sr, and Ba) were investigated. La0.6Ca0.4FeO3-δ (LCF64) and La0.6Sr0.4FeO3-δ (LSF64) show a phase transformation in air at elevated temperature, i.e., from orthorhombic (Pnma) to rhombohedral (R3[combining macron]c) and from rhombohedral to cubic (Pm3[combining macron]m), respectively, while La0.6Ba0.4FeO3-δ (LBF64) remains cubic over the entire temperature range from room temperature to 1000 °C. The different phase behaviour of the solids is interpreted to reflect the decreased tendency for octahedral tilting with increasing alkaline-earth-metal dopant ion radius. The electrical conductivity of LSF64 is 191 S cm-1 in air at 800 °C, decreasing to a value of 114 S cm-1 at a pO2 of 0.01 atm, and found over this pO2 range roughly twice as high as those of LCF64 and LBF64. Failure to describe the data of electrical conductivity using Holstein's small polaron theory is briefly discussed. Chemical diffusion coefficients and surface exchange coefficients of the materials in the range 650-900 °C were extracted from data of electrical conductivity relaxation. Data of oxygen nonstoichiometry was used to calculate the vacancy diffusion coefficients from the measured chemical diffusion coefficients. The calculated migration enthalpies are found to decrease in the order LCF64 (1.08 ± 0.04 eV) > LSF64 (0.95 ± 0.01 eV) > LBF64 (0.81 ± 0.01 eV). The estimated ionic conductivities of the materials, at 900 °C, are within a factor of 1.4.
Collapse
Affiliation(s)
- Jia Song
- Electrochemistry Research Group, Membrane Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.
| | - De Ning
- Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Henny J M Bouwmeester
- Electrochemistry Research Group, Membrane Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.
| |
Collapse
|
34
|
Lu Q, Huberman S, Zhang H, Song Q, Wang J, Vardar G, Hunt A, Waluyo I, Chen G, Yildiz B. Bi-directional tuning of thermal transport in SrCoO x with electrochemically induced phase transitions. NATURE MATERIALS 2020; 19:655-662. [PMID: 32094497 DOI: 10.1038/s41563-020-0612-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 01/10/2020] [Indexed: 05/23/2023]
Abstract
Unlike the wide-ranging dynamic control of electrical conductivity, there does not exist an analogous ability to tune thermal conductivity by means of electric potential. The traditional picture assumes that atoms inserted into a material's lattice act purely as a source of scattering for thermal carriers, which can only reduce thermal conductivity. In contrast, here we show that the electrochemical control of oxygen and proton concentration in an oxide provides a new ability to bi-directionally control thermal conductivity. On electrochemically oxygenating the brownmillerite SrCoO2.5 to the perovskite SrCoO3-δ, the thermal conductivity increases by a factor of 2.5, whereas protonating it to form hydrogenated SrCoO2.5 effectively reduces the thermal conductivity by a factor of four. This bi-directional tuning of thermal conductivity across a nearly 10 ± 4-fold range at room temperature is achieved by using ionic liquid gating to trigger the 'tri-state' phase transitions in a single device. We elucidated the effects of these anionic and cationic species, and the resultant changes in lattice constants and lattice symmetry on thermal conductivity by combining chemical and structural information from X-ray absorption spectroscopy with thermoreflectance thermal conductivity measurements and ab initio calculations. This ability to control multiple ion types, multiple phase transitions and electronic conductivity that spans metallic through to insulating behaviour in oxides by electrical means provides a new framework for tuning thermal transport over a wide range.
Collapse
Affiliation(s)
- Qiyang Lu
- Laboratory for Electrochemical Interfaces, Massachusetts Institute of Technology, Cambridge, MA, USA
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Samuel Huberman
- Department of Mechanical Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Hantao Zhang
- Laboratory for Electrochemical Interfaces, Massachusetts Institute of Technology, Cambridge, MA, USA
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Qichen Song
- Department of Mechanical Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jiayue Wang
- Laboratory for Electrochemical Interfaces, Massachusetts Institute of Technology, Cambridge, MA, USA
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Gulin Vardar
- Laboratory for Electrochemical Interfaces, Massachusetts Institute of Technology, Cambridge, MA, USA
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Adrian Hunt
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, USA
| | - Iradwikanari Waluyo
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, USA
| | - Gang Chen
- Department of Mechanical Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Bilge Yildiz
- Laboratory for Electrochemical Interfaces, Massachusetts Institute of Technology, Cambridge, MA, USA.
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
| |
Collapse
|
35
|
Abstract
We review oxygen K-edge X-ray absorption spectra of both molecules and solids. We start with an overview of the main experimental aspects of oxygen K-edge X-ray absorption measurements including X-ray sources, monochromators, and detection schemes. Many recent oxygen K-edge studies combine X-ray absorption with time and spatially resolved measurements and/or operando conditions. The main theoretical and conceptual approximations for the simulation of oxygen K-edges are discussed in the Theory section. We subsequently discuss oxygen atoms and ions, binary molecules, water, and larger molecules containing oxygen, including biomolecular systems. The largest part of the review deals with the experimental results for solid oxides, starting from s- and p-electron oxides. Examples of theoretical simulations for these oxides are introduced in order to show how accurate a DFT description can be in the case of s and p electron overlap. We discuss the general analysis of the 3d transition metal oxides including discussions of the crystal field effect and the effects and trends in oxidation state and covalency. In addition to the general concepts, we give a systematic overview of the oxygen K-edges element by element, for the s-, p-, d-, and f-electron systems.
Collapse
Affiliation(s)
- Federica Frati
- Inorganic
chemistry and catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584CG Utrecht, The Netherlands
| | | | - Frank M. F. de Groot
- Inorganic
chemistry and catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584CG Utrecht, The Netherlands
| |
Collapse
|
36
|
Wang H, Frontera C, Herrero-Martín J, Pomar A, Roura P, Martínez B, Mestres N. Aqueous Chemical Solution Deposition of Functional Double Perovskite Epitaxial Thin Films. Chemistry 2020; 26:9338-9347. [PMID: 32101347 DOI: 10.1002/chem.202000129] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Indexed: 11/11/2022]
Abstract
Double perovskite structure (A2 BB'O6 ) oxides exhibit a breadth of multifunctional properties with a huge potential range of applications in fields as diverse as spintronics, magneto-optic devices, or catalysis, and most of these applications require the use of thin films and heterostructures. Chemical solution deposition techniques are appearing as a very promising methodology to achieve epitaxial oxide thin films combining high performance with high throughput and low cost. In addition, the physical properties of these materials are strongly dependent on the ordered arrangement of cations in the double perovskite structure. Thus, promoting spontaneous cationic ordering has become a relevant issue. In this work, our recent achievements by using polymer-assisted deposition (PAD) of environmentally friendly, water-based solutions for the growth of epitaxial ferromagnetic insulating double perovskite La2 CoMnO6 and La2 NiMnO6 thin films on SrTiO3 and LaAlO3 single-crystal substrates are presented. It is shown that the particular crystallization and growth process conditions of PAD (very slow rate, close to thermodynamic equilibrium conditions) promote high crystallinity and quality of the films, as well as favors spontaneous B-site cationic ordering.
Collapse
Affiliation(s)
- Hailin Wang
- Institut de Ciència de Materials de Barcelona, ICMAB, Consejo Superior de Investigaciones Científicas, CSIC, Campus de la UAB, 08193, Bellaterra, Barcelona, Spain
| | - Carlos Frontera
- Institut de Ciència de Materials de Barcelona, ICMAB, Consejo Superior de Investigaciones Científicas, CSIC, Campus de la UAB, 08193, Bellaterra, Barcelona, Spain
| | - Javier Herrero-Martín
- ALBA Synchrotron Light Source, C. de la Llum 2-26, 08920, Cerdanyola del Vallès, Spain
| | - Alberto Pomar
- Institut de Ciència de Materials de Barcelona, ICMAB, Consejo Superior de Investigaciones Científicas, CSIC, Campus de la UAB, 08193, Bellaterra, Barcelona, Spain
| | - Pere Roura
- Universitat de Girona, Campus Montilivi, Edif. PII, 17071, Girona, Catalonia, Spain
| | - Benjamín Martínez
- Institut de Ciència de Materials de Barcelona, ICMAB, Consejo Superior de Investigaciones Científicas, CSIC, Campus de la UAB, 08193, Bellaterra, Barcelona, Spain
| | - Narcis Mestres
- Institut de Ciència de Materials de Barcelona, ICMAB, Consejo Superior de Investigaciones Científicas, CSIC, Campus de la UAB, 08193, Bellaterra, Barcelona, Spain
| |
Collapse
|
37
|
Nandy S, Kaur K, Gautam S, Chae KH, Nanda BRK, Sudakar C. Maximizing Short Circuit Current Density and Open Circuit Voltage in Oxygen Vacancy-Controlled Bi 1-xCa xFe 1-yTi yO 3-δ Thin-Film Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2020; 12:14105-14118. [PMID: 32118399 DOI: 10.1021/acsami.9b18357] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Designing solid-state perovskite oxide solar cells with large short circuit current (JSC) and open circuit voltage (VOC) has been a challenging problem. Epitaxial BiFeO3 (BFO) films are known to exhibit large VOC (>50 V). However, they exhibit low JSC (≪μA/cm2) under 1 Sun illumination. In this work, taking polycrystalline BiFeO3 thin films, we demonstrate that oxygen vacancies (VO) present within the lattice and at grain boundary (GB) can explicitly be controlled to achieve high JSC and VOC simultaneously. While aliovalent substitution (Ca2+ at Bi3+ site) is used to control the lattice VO, Ca and Ti cosubstitution is used to bring out only GB-VO. Fluorine-doped tin oxide (FTO)/Bi1-xCaxFe1-yTiyO3-δ/Au devices are tested for photovoltaic characteristics. Introducing VO increases the photocurrent by four orders (JSC ∼ 3 mA/cm2). On the contrary, VOC is found to be <0.5 V, as against 0.5-3 V observed for the pristine BiFeO3. Ca and Ti cosubstitution facilitate the formation of smaller crystallites, which in turn increase the GB area and thereby the GB-VO. This creates defect bands occupying the bulk band gap, as inferred from the diffused reflection spectra and band structure calculations, leading to a three-order increase in JSC. The cosubstitution, following a charge compensation mechanism, decreases the lattice VO concentration significantly to retain the ferroelectric nature with enhanced polarization. It helps to achieve VOC (3-8 V) much larger than that of BiFeO3 (0.5-3 V). It is noteworthy that as Ca substitution maintains moderate crystallite size, the lattice VO concentration dominates GB-VO concentration. Notwithstanding, both lattice and GB-VO contribute to the increase in JSC; the former weakens ferroelectricity, and as a consequence, undesirably, VOC is lowered well below 0.5 V. Using optimum JSC and VOC, we demonstrate that the efficiency ∼0.22% can be achieved in solid-state BFO solar cells under AM 1.5 one Sun illumination.
Collapse
Affiliation(s)
- Subhajit Nandy
- Multifunctional Materials Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600 036, India
| | - Kulwinder Kaur
- Condensed Matter Theory and Computational Lab, Department of Physics, Indian Institute of Technology Madras, Chennai 600 036, India
| | - Sanjeev Gautam
- Advanced Functional Materials Lab, Dr. S. S. Bhatnagar University Institute of Chemical Engineering & Technology, Punjab University, Chandigarh 160014, India
| | - Keun Hwa Chae
- Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 02792, Korea
| | - B R K Nanda
- Condensed Matter Theory and Computational Lab, Department of Physics, Indian Institute of Technology Madras, Chennai 600 036, India
| | - Chandran Sudakar
- Multifunctional Materials Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600 036, India
| |
Collapse
|
38
|
Li W, Zhu B, He Q, Borisevich AY, Yun C, Wu R, Lu P, Qi Z, Wang Q, Chen A, Wang H, Cavill SA, Zhang KHL, MacManus‐Driscoll JL. Interface Engineered Room-Temperature Ferromagnetic Insulating State in Ultrathin Manganite Films. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1901606. [PMID: 31921553 PMCID: PMC6947487 DOI: 10.1002/advs.201901606] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 10/23/2019] [Indexed: 06/10/2023]
Abstract
Ultrathin epitaxial films of ferromagnetic insulators (FMIs) with Curie temperatures near room temperature are critically needed for use in dissipationless quantum computation and spintronic devices. However, such materials are extremely rare. Here, a room-temperature FMI is achieved in ultrathin La0.9Ba0.1MnO3 films grown on SrTiO3 substrates via an interface proximity effect. Detailed scanning transmission electron microscopy images clearly demonstrate that MnO6 octahedral rotations in La0.9Ba0.1MnO3 close to the interface are strongly suppressed. As determined from in situ X-ray photoemission spectroscopy, O K-edge X-ray absorption spectroscopy, and density functional theory, the realization of the FMI state arises from a reduction of Mn eg bandwidth caused by the quenched MnO6 octahedral rotations. The emerging FMI state in La0.9Ba0.1MnO3 together with necessary coherent interface achieved with the perovskite substrate gives very high potential for future high performance electronic devices.
Collapse
Affiliation(s)
- Weiwei Li
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage RoadCambridgeCB3 0FSUK
| | - Bonan Zhu
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage RoadCambridgeCB3 0FSUK
| | - Qian He
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3ATUK
| | - Albina Y. Borisevich
- Center for Nanophase Materials SciencesOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Chao Yun
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage RoadCambridgeCB3 0FSUK
| | - Rui Wu
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage RoadCambridgeCB3 0FSUK
| | - Ping Lu
- Sandia National LaboratoryAlbuquerqueNM87185USA
| | - Zhimin Qi
- School of Materials EngineeringPurdue UniversityWest LafayetteIN47907USA
| | - Qiang Wang
- Department of Physics and AstronomyWest Virginia UniversityMorgantownWV26506USA
| | - Aiping Chen
- Center for Integrated NanotechnologiesLos Alamos National LaboratoryLos AlamosNM87545USA
| | - Haiyan Wang
- School of Materials EngineeringPurdue UniversityWest LafayetteIN47907USA
| | - Stuart A. Cavill
- Department of PhysicsUniversity of YorkYorkYO10 5DDUK
- Diamond Light SourceDidcotOX11 0DEUK
| | - Kelvin H. L. Zhang
- State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China
| | - Judith L. MacManus‐Driscoll
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage RoadCambridgeCB3 0FSUK
| |
Collapse
|
39
|
Carreira SJ, Aguirre MH, Briatico J, Steren LB. Nanoscale magnetic and charge anisotropies at manganite interfaces. RSC Adv 2019; 9:38604-38611. [PMID: 35540222 PMCID: PMC9075869 DOI: 10.1039/c9ra06552k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 11/06/2019] [Indexed: 11/23/2022] Open
Abstract
Strong correlated manganites are still under intense research owing to their complex phase diagrams in terms of Sr-doping and their sensitivity to intrinsic and extrinsic structural deformations. Here, we performed X-ray absorption spectroscopy measurements of manganite bilayers to explore the effects that a local Sr-doping gradient produce on the charge and antiferromagnetic anisotropies. In order to gradually tune the Sr-doping level along the axis perpendicular to the samples we have grown a series of bilayers with different thicknesses of low-doped manganites (from 0 nm to 6 nm) deposited over a La0.7Sr0.3MnO3 metallic layer. This strategy permitted us to resolve with high accuracy the thickness region where the charge and spin anisotropies vary and the critical thickness tc over which the out of plane orbital asymmetry does not have any further modifications. We found that the antiferromagnetic spin axis points preferentially out of the sample plane regardless the capping layer thickness. However, it tilts partially into the sample plane far from this critical thickness, owing to the combined contributions of the external structural strain and electron doping. Furthermore, we found that the doping level of the capping layer strongly affects the critical thickness, giving clear evidence of the influence exerted by the electron doping on the orbital and magnetic configurations. These anisotropic changes induce subtle modifications on the domain reorientation of La0.7Sr0.3MnO3, as evidenced from the magnetic hysteresis cycles. Nanoscale variation of antiferromagnetic and charge anisotropies has been found at manganite interfaces with an artificially created Sr-doping.![]()
Collapse
Affiliation(s)
- Santiago J Carreira
- Consejo Nacional de Investigaciones Científicas y Técnicas Argentina +54-11-6772-7103.,Laboratorio de Nanoestructuras Magnéticas y Dispositivos, Dpto. Materia Condensada, Instituto de Nanociencia y Nanotecnología (INN), Centro Atómico Constituyentes (CNEA) 1650 San Martín Buenos Aires Argentina
| | - Myriam H Aguirre
- Instituto de Ciencia de Materiales de Aragón (ICMA), Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza E-50018 Zaragoza Spain +34 976 76 2776 +34 876 55 5365.,Departamento de Física de la Materia Condensada, Universidad de Zaragoza E-50009 Zaragoza Spain.,Laboratorio de Microscopías Avanzadas, Universidad de Zaragoza E-50018 Zaragoza Spain
| | - Javier Briatico
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Sud, Université Paris-Saclay Palaiseau 91767 France
| | - Laura B Steren
- Consejo Nacional de Investigaciones Científicas y Técnicas Argentina +54-11-6772-7103.,Laboratorio de Nanoestructuras Magnéticas y Dispositivos, Dpto. Materia Condensada, Instituto de Nanociencia y Nanotecnología (INN), Centro Atómico Constituyentes (CNEA) 1650 San Martín Buenos Aires Argentina
| |
Collapse
|
40
|
Kawai K, Asakura D, Nishimura SI, Yamada A. Stabilization of a 4.5 V Cr 4+/Cr 3+ redox reaction in NASICON-type Na 3Cr 2(PO 4) 3 by Ti substitution. Chem Commun (Camb) 2019; 55:13717-13720. [PMID: 31657818 DOI: 10.1039/c9cc04860j] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The development of high-voltage cathode materials composed of abundant metals for rechargeable batteries is a crucial task to realize higher energy density in large-scale electrical energy storage systems. Here we report a reversible Cr4+/Cr3+ redox reaction at 4.5 V vs. Na/Na+ in NASICON-type Na2CrTi(PO4)3 (NCTP). An unstable Cr4+/Cr3+ redox in Na3Cr2(PO4)3 is successfully stabilized by the substitution of Ti with Cr. The charge/discharge mechanism of NCTP was studied by powder X-ray diffraction and soft X-ray absorption spectroscopy.
Collapse
Affiliation(s)
- Kosuke Kawai
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan. .-tokyo.ac.jp
| | - Daisuke Asakura
- Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8564, Japan
| | - Shin-Ichi Nishimura
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan. .-tokyo.ac.jp and Elemental Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Atsuo Yamada
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan. .-tokyo.ac.jp and Elemental Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| |
Collapse
|
41
|
Rogge PC, Shafer P, Fabbris G, Hu W, Arenholz E, Karapetrova E, Dean MPM, Green RJ, May SJ. Depth-Resolved Modulation of Metal-Oxygen Hybridization and Orbital Polarization across Correlated Oxide Interfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1902364. [PMID: 31515864 DOI: 10.1002/adma.201902364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 08/22/2019] [Indexed: 06/10/2023]
Abstract
Interface-induced modifications of the electronic, magnetic, and lattice degrees of freedom drive an array of novel physical properties in oxide heterostructures. Here, large changes in metal-oxygen band hybridization, as measured in the oxygen ligand hole density, are induced as a result of interfacing two isovalent correlated oxides. Using resonant X-ray reflectivity, a superlattice of SrFeO3 and CaFeO3 is shown to exhibit an electronic character that spatially evolves from strongly O-like in SrFeO3 to strongly Fe-like in CaFeO3 . This alternating degree of Fe electronic character is correlated with a modulation of an Fe 3d orbital polarization, giving rise to an orbital superstructure. At the SrFeO3 /CaFeO3 interfaces, the ligand hole density and orbital polarization reconstruct in a single unit cell of CaFeO3 , demonstrating how the mismatch in these electronic parameters is accommodated at the interface. These results provide new insight into how the orbital character of electrons is altered by correlated oxide interfaces and lays out a broadly applicable approach for depth-resolving band hybridization.
Collapse
Affiliation(s)
- Paul C Rogge
- Department of Materials Science and Engineering, Drexel University, 3141 Chestnut St., Philadelphia, PA, 19104, USA
| | - Padraic Shafer
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, CA, 94720, USA
| | - Gilberto Fabbris
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, 98 Rochester St., Upton, NY, 11973, USA
| | - Wen Hu
- National Synchrotron Light Source II, Brookhaven National Laboratory, 98 Rochester St., Upton, NY, 11973, USA
| | - Elke Arenholz
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, CA, 94720, USA
- Cornell High Energy Synchrotron Source, Cornell University, 161 Wilson Laboratory, Synchrotron Drive, Ithaca, NY, 14853, USA
| | - Evguenia Karapetrova
- Advanced Photon Source, Argonne National Laboratory, 9700 S Cass Ave, Lemont, IL, 60439, USA
| | - Mark P M Dean
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, 98 Rochester St., Upton, NY, 11973, USA
| | - Robert J Green
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Pl, Saskatoon, Saskatchewan, S7N 5E2, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, 111-2355 E Mall, Vancouver, British Columbia, V6T 1Z4, Canada
| | - Steven J May
- Department of Materials Science and Engineering, Drexel University, 3141 Chestnut St., Philadelphia, PA, 19104, USA
| |
Collapse
|
42
|
Nallagatla VR, Heisig T, Baeumer C, Feyer V, Jugovac M, Zamborlini G, Schneider CM, Waser R, Kim M, Jung CU, Dittmann R. Topotactic Phase Transition Driving Memristive Behavior. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1903391. [PMID: 31441160 DOI: 10.1002/adma.201903391] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 07/26/2019] [Indexed: 06/10/2023]
Abstract
Redox-based memristive devices are one of the most attractive candidates for future nonvolatile memory applications and neuromorphic circuits, and their performance is determined by redox processes and the corresponding oxygen-ion dynamics. In this regard, brownmillerite SrFeO2.5 has been recently introduced as a novel material platform due to its exceptional oxygen-ion transport properties for resistive-switching memory devices. However, the underlying redox processes that give rise to resistive switching remain poorly understood. By using X-ray absorption spectromicroscopy, it is demonstrated that the reversible redox-based topotactic phase transition between the insulating brownmillerite phase, SrFeO2.5 , and the conductive perovskite phase, SrFeO3 , gives rise to the resistive-switching properties of SrFeOx memristive devices. Furthermore, it is found that the electric-field-induced phase transition spreads over a large area in (001) oriented SrFeO2.5 devices, where oxygen vacancy channels are ordered along the in-plane direction of the device. In contrast, (111)-grown SrFeO2.5 devices with out-of-plane oriented oxygen vacancy channels, reaching from the bottom to the top electrode, show a localized phase transition. These findings provide detailed insight into the resistive-switching mechanism in SrFeOx -based memristive devices within the framework of metal-insulator topotactic phase transitions.
Collapse
Affiliation(s)
- Venkata R Nallagatla
- Peter Gruenberg Institute, Forschungszentrum Juelich GmbH and JARA-FIT, 52425, Juelich, Germany
- Department of Physics and Oxide Research Centre, Hankuk University of Foreign Studies, Yongin, 17035, South Korea
| | - Thomas Heisig
- Peter Gruenberg Institute, Forschungszentrum Juelich GmbH and JARA-FIT, 52425, Juelich, Germany
- Institute of Electronic Materials, IWE2, RWTH Aachen University, 52056, Aachen, Germany
| | - Christoph Baeumer
- Peter Gruenberg Institute, Forschungszentrum Juelich GmbH and JARA-FIT, 52425, Juelich, Germany
- Institute of Electronic Materials, IWE2, RWTH Aachen University, 52056, Aachen, Germany
| | - Vitaliy Feyer
- Peter Gruenberg Institute, Forschungszentrum Juelich GmbH and JARA-FIT, 52425, Juelich, Germany
- Fakultaet f. Physik and Center for Nanointegration Duisburg-Essen (CENIDE), Universitat Duisburg-Essen, 47048, Duisburg, Germany
| | - Matteo Jugovac
- Peter Gruenberg Institute, Forschungszentrum Juelich GmbH and JARA-FIT, 52425, Juelich, Germany
| | - Giovanni Zamborlini
- Peter Gruenberg Institute, Forschungszentrum Juelich GmbH and JARA-FIT, 52425, Juelich, Germany
- Technische Universitaet Dortmund, Experimentelle Physik VI, 44227, Dortmund, Germany
| | - Claus M Schneider
- Peter Gruenberg Institute, Forschungszentrum Juelich GmbH and JARA-FIT, 52425, Juelich, Germany
- Fakultaet f. Physik and Center for Nanointegration Duisburg-Essen (CENIDE), Universitat Duisburg-Essen, 47048, Duisburg, Germany
- Department of Physics, University of California, Davis, CA, 95616, USA
| | - Rainer Waser
- Peter Gruenberg Institute, Forschungszentrum Juelich GmbH and JARA-FIT, 52425, Juelich, Germany
- Institute of Electronic Materials, IWE2, RWTH Aachen University, 52056, Aachen, Germany
| | - Miyoung Kim
- Department of Material Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, South Korea
| | - Chang Uk Jung
- Department of Physics and Oxide Research Centre, Hankuk University of Foreign Studies, Yongin, 17035, South Korea
| | - Regina Dittmann
- Peter Gruenberg Institute, Forschungszentrum Juelich GmbH and JARA-FIT, 52425, Juelich, Germany
| |
Collapse
|
43
|
Anjum G, Bhat FH. Study of magneto capacitance effect, exchange bias, XMCD and XAS in La 0.8Bi 0.2Fe 0.7Mn 0.3O 3/LaNiO 3/LaAlO 3 multiferroic thin film. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:345001. [PMID: 31100746 DOI: 10.1088/1361-648x/ab229c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Magneto capacitance (MC) property of La0.8Bi0.2Fe0.7Mn0.3O3/LaNiO3/LaAlO3 thin film has been studied at an applied magnetic field of 0 T and 5 T. Variation of capacitance versus frequency at different temperatures (80 K, 100 K,180 K and 200 K) with the application of magnetic field depicts the unification of ferroic (ferroelectric and ferromagnetic) properties. This is a significant aspect for a system to be multiferroic, a choice for better device application. Exchange bias effect is observed on meticulous study of hysteresis loop taken at 5 K and 10 K upto ~1 Tesla (while cooling thin film in 5 kOe of applied magnetic field) in the form of systematic shift in loops on positive side of applied magnetic field. Hysteresis loop shifts accordingly on negative side on changing the polarity of field (-5 kOe) in field cooled mode, confirming the intrinsic nature of exchange bias effect in thin film. The NEXAFS technique has been used in finding the electronic structure, charge state and local symmetry of ions present in thin film; therefore the mechanism(s) responsible for its major properties. Magnetic character of thin film is studied using x-ray magnetic circular dichroism (XMCD) measurements. NEXAFS data of Mn L3,2- edge spectra indicates the presence of Mn2+ /Mn3+ valence states with contribution from Mn4+ ions in the system, which corroborates the ferrimagnetic nature revealed by thin film. L3,2- edge of Fe along with reference compound (Fe2O3) reveals that these ions are present in trivalent state (Fe3+) in octahedral symmetry. O K-edge features compliment the magneto-electric (ME) properties of the thin film. Charge transfer multiplet calculations confirm that Mn ions exist in different charge states (Mn2+,3,+4+) whereas Fe ions exhibit single (Fe3+) valent state in thin film.
Collapse
Affiliation(s)
- G Anjum
- Department of Physics, S. P. College, Cluster University, Srinagar, Jammu & Kashmir 190001, India
| | | |
Collapse
|
44
|
Yu J, Xiang C, Zhang G, Wang H, Ji Q, Qu J. Activation of Lattice Oxygen in LaFe (Oxy)hydroxides for Efficient Phosphorus Removal. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:9073-9080. [PMID: 31241325 DOI: 10.1021/acs.est.9b01939] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Lanthanum (La)-based materials have been recognized as promising adsorbents for aqueous phosphate removal. The incorporation of base metals into La (oxy)hydroxides represents an effective strategy to improve adsorption performance. Understanding how base metals affect phosphate adsorption is challenging but essential for the development of effective materials for phosphorus control. Herein, we demonstrated a high-performance LaFe (oxy)hydroxide and studied its mechanisms on phosphate adsorption. The P K edge X-ray absorption near edge structure (XANES) analysis showed that PO43- was preferentially bonded with La, and the lattice oxygen in LaFe (oxy)hydroxide was demonstrated to be the active site. The O K edge XANES suggested that Fe optimized the electron structure of La, and Fe/La metal orbital hybridization resulted in the shift of oxygen p character to unoccupied states, facilitating phosphate adsorption. Furthermore, surface analysis showed that the pore size and volume were increased due to the introduction of Fe, which enabled efficient utilization of the active sites and fast adsorption kinetics. The dual effects of Fe in LaFe (oxy)hydroxide greatly enhance the effectiveness of La and represent a new strategy for the development of future phosphorus-control materials.
Collapse
Affiliation(s)
- Jie Yu
- College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution , Beijing Forestry University , Beijing 100083 , China
- Xiong'an Institute of Eco-Environment , Hebei University , Baoding 071002 , China
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Chao Xiang
- College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution , Beijing Forestry University , Beijing 100083 , China
- Xiong'an Institute of Eco-Environment , Hebei University , Baoding 071002 , China
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Gong Zhang
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Hongjie Wang
- College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution , Beijing Forestry University , Beijing 100083 , China
- Xiong'an Institute of Eco-Environment , Hebei University , Baoding 071002 , China
| | - Qinghua Ji
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Jiuhui Qu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| |
Collapse
|
45
|
Park SH, Yoon J, Kim C, Hwang C, Kim DH, Lee SH, Kwon S. Scientific instruments for soft X-ray photon-in/photon-out spectroscopy on the PAL-XFEL. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:1031-1036. [PMID: 31274424 DOI: 10.1107/s1600577519004272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 03/29/2019] [Indexed: 06/09/2023]
Abstract
An overview is given of the soft X-ray photon-in/photon-out instruments on the free-electron laser (FEL) beamline at the Pohang Accelerator Laboratory, and selected commissioning results are presented. The FEL beamline provides a photon energy of 270 to 1200 eV, with an energy bandwidth of 0.44%, an energy of 200 µJ per pulse and a pulse width of <50 fs (full width at half-maximum). The estimated total time resolution between optical laser and X-ray pulses is <100 fs. Instruments for X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) have been set up. X-ray magnetic circular dichroism spectra for a Co/Pt multilayer film and RIXS spectra for α-Fe2O3(100) have been obtained and the performance of the spectrometer has been evaluated.
Collapse
Affiliation(s)
- Sang Han Park
- PAL-XFEL, Pohang Accelerator Laboratory, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Jungbum Yoon
- Spin Convergence Research Team, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
| | - Changsoo Kim
- Spin Convergence Research Team, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
| | - Chanyong Hwang
- Spin Convergence Research Team, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
| | - Dong Hyun Kim
- Department of Physics, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
| | - Sang Hyuk Lee
- Advanced Instrumentation Institute, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
| | - Soonnam Kwon
- PAL-XFEL, Pohang Accelerator Laboratory, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, Republic of Korea
| |
Collapse
|
46
|
Sun Y, Liu Z, Zhang W, Chu X, Cong Y, Huang K, Feng S. Unfolding BOB Bonds for an Enhanced ORR Performance in ABO 3 -Type Perovskites. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1803513. [PMID: 30427576 DOI: 10.1002/smll.201803513] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 10/05/2018] [Indexed: 06/09/2023]
Abstract
Identifying the relationship between catalytic performance and material structure is crucial to establish the design principle for highly active catalysts. Deficiency in BO bond covalency induced by lattice distortion severely restricts the oxygen reduction reaction (ORR) performance for ABO3 -type perovskite oxides. Herein, a rearrangement of hybridization mode for BO bond is used to tune the overlap of the electron cloud between B 3d and O 2p through A-stie doping with larger radius ions. The BO bond covalency is strengthened with a BOB bond angle recovered from intrinsic structural distortion. As a result, the adsorption and the reduction process for O2 on the oxide surface can be promoted via shifting the O-2p band center toward the Fermi Level. Simultaneously, the spin electrons in the Mn 3d orbit become more parallel. It will lead to a high electrical conductivity by the enhanced double exchange process and thereof mitigate the ORR efficiency loss. Further density functional theory calculation reveals that a flat [BO2 ] plane will make contribution to the charge transfer process from lattice oxygen to adsorbed oxygen (mediated with B ions). Through such exploration of the effect of crystal structure on the electronic state of perovskite oxides, a novel insight into design of highly active ORR catalysts is offered.
Collapse
Affiliation(s)
- Yu Sun
- College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Zhongyuan Liu
- College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Wei Zhang
- School of Materials Science and Engineering and Electron Microscopy Center, Jilin University, Changchun, 130012, P. R. China
| | - Xuefeng Chu
- Jilin Provincial Key Laboratory of Architectural Electricity and Comprehensive Energy Saving, School of Electrical and Electronic Information Engineering, Jilin Jianzhu University, Changchun, 130118, P. R. China
| | - Yingge Cong
- College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Keke Huang
- College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Shouhua Feng
- College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| |
Collapse
|
47
|
Atomic replacement effects on the band structure of doped perovskite thin films. Sci Rep 2019; 9:7828. [PMID: 31127125 PMCID: PMC6534537 DOI: 10.1038/s41598-019-44104-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 04/10/2019] [Indexed: 11/08/2022] Open
Abstract
The potential applications of perovskite manganite R1-xAxMnO3 (R = rare earth element; A = Sr, Ca) thin films have been continuously explored due to their multi-functional properties. In particular, the optimally hole-doped La0.67Ca0.33MnO3 thin film demonstrates a colossal magneto-resistance that is beneficial to the performance of spintronic devices. To understand the effect of R and A ions on the material properties, we systematically measure the resistivity, magnetization, and electronic energy states for three optimally hole-doped R0.67A0.33MnO3 thin films with R = La, Sm and A = Sr, Ca. Various energy parameters are derived based on the X-ray absorption and X-ray photoelectron spectra, including the band gap, the charge frustration energy and the magnetic exchange energy. It is interesting to find that the replacement of La with Sm is more effective than that of Sr with Ca in terms of tuning the electrical property, the Curie temperature, and the band gap. The strain-induced reduction of the O 2p- Mn 3d hybridization and the interplay of R/A site disorder and strain effect are discussed. The results of this study provide useful information for the band design of perovskite oxide films.
Collapse
|
48
|
Huang SW, Liu YT, Lee JM, Chen JM, Lee JF, Schoenlein RW, Chuang YD, Lin JY. Polaronic effect in the x-ray absorption spectra of La 1-x Ca x MnO 3 manganites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:195601. [PMID: 30848247 DOI: 10.1088/1361-648x/ab05a2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
X-ray absorption spectroscopy (XAS) is performed to study changes in the electronic structures of colossal magnetoresistance (CMR) and charged ordered (CO) La1-x Ca x MnO3 manganites with respect to temperature. The pre-edge features in O and Mn K-edge XAS spectra, which are highly sensitive to the local distortion of MnO6 octahedral, exhibit contrasting temperature dependence between CMR and CO samples. The seemingly counter-intuitive XAS temperature dependence can be reconciled in the context of polarons. These results help identify the most relevant orbital states associated with polarons and highlight the crucial role played by polarons in understanding the electronic structures of manganites.
Collapse
Affiliation(s)
- S W Huang
- MAX IV Laboratory, Lund University, PO Box 118, 221 00 Lund, Sweden. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Zeng X, Zhang J, Si M, Cao D, Deng X, Ma H, Lan Q, Xue D, Zhang X, Tao K, Peng Y. Direct imaging of dopant sites in rare-earth element-doped permanent magnet and correlated magnetism origin. NANOSCALE 2019; 11:4385-4393. [PMID: 30801577 DOI: 10.1039/c8nr09922g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Identifying the dopants and their occupation sites in rare-earth-doped permanent magnets is critical not only to understand the mechanism of tuning their magnetic properties, but also to develop guiding principles to further improve their performance. In this study, we present a direct observation of the preferred atomic sites of La atoms in La-doped M-type SrFe12O19 hexaferrite. Our data solidly clarified that only the Sr2+ cations were replaced by La3+ cations, and the La-doping caused the changes in the valence states of iron cations located at the 4f1 and 2a crystallographic sites. First principles calculations further revealed that after La-doping, the changes in the spin states of the Fe3+ cations located at the 4f1 tetrahedral sites resulted in magnetization enhancement and those of the 2a octahedral sites contributed to electrical neutrality, well matching the experimental atomic-column resolution EELS and magnetic measurement results.
Collapse
Affiliation(s)
- Xue Zeng
- Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education, School of Physical Science and Technology and Electron Microscopy Centre of Lanzhou University, Lanzhou University, Lanzhou 730000, P. R. China.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Saleem MS, Cui B, Song C, Sun Y, Gu Y, Zhang R, Fayaz MU, Zhou X, Werner P, Parkin SSP, Pan F. Electric Field Control of Phase Transition and Tunable Resistive Switching in SrFeO 2.5. ACS APPLIED MATERIALS & INTERFACES 2019; 11:6581-6588. [PMID: 30663876 DOI: 10.1021/acsami.8b18251] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
SrFeO x (SFO x) compounds exhibit ionic conduction and oxygen-related phase transformation, having potential applications in solid oxide fuel cells, smart windows, and memristive devices. The phase transformation in SFO x typically requires a thermal annealing process under various pressure conditions, hindering their practical applications. Here, we have achieved a reversible phase transition from brownmillerite (BM) to perovskite (PV) in SrFeO2.5 (SFO2.5) films through ionic liquid (IL) gating. The real-time phase transformation is imaged using in situ high-resolution transmission electron microscopy. The magnetic transition in SFO2.5 is identified by fabricating an assisted La0.7Sr0.3MnO3 (LSMO) bottom layer. The IL-gating-converted PV phase of a SrFeO3-δ (SFO3-δ) layer shows a ferromagnetic-like behavior but applies a huge pinning effect on LSMO magnetic moments, which consequently leads to a prominent exchange bias phenomenon, suggesting an uncompensated helical magnetic structure of SFO3-δ. On the other hand, the suppression of both magnetic and exchange coupling signals for a BM-phased SFO2.5 layer elucidates its fully compensated G-type antiferromagnetic nature. We also demonstrated that the phase transition by IL gating is an effective pathway to tune the resistive switching parameters, such as set, reset, and high/low-resistance ratio in SFO2.5-based resistive random-access memory devices.
Collapse
Affiliation(s)
- Muhammad Shahrukh Saleem
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Bin Cui
- Max Planck Institute for Microstructure Physics , 06120 Halle , Germany
| | - Cheng Song
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Yiming Sun
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Youdi Gu
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Ruiqi Zhang
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Muhammad Umer Fayaz
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Xiaofeng Zhou
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Peter Werner
- Max Planck Institute for Microstructure Physics , 06120 Halle , Germany
| | - Stuart S P Parkin
- Max Planck Institute for Microstructure Physics , 06120 Halle , Germany
| | - Feng Pan
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| |
Collapse
|