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Moragues T, Giannakakis G, Ruiz-Ferrando A, Borca CN, Huthwelker T, Bugaev A, de Mello AJ, Pérez-Ramírez J, Mitchell S. Droplet-Based Microfluidics Reveals Insights into Cross-Coupling Mechanisms over Single-Atom Heterogeneous Catalysts. Angew Chem Int Ed Engl 2024; 63:e202401056. [PMID: 38472115 DOI: 10.1002/anie.202401056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/08/2024] [Accepted: 03/12/2024] [Indexed: 03/14/2024]
Abstract
Single-atom heterogeneous catalysts (SACs) hold promise as sustainable alternatives to metal complexes in organic transformations. However, their working structure and dynamics remain poorly understood, hindering advances in their design. Exploiting the unique features of droplet-based microfluidics, we present the first in-situ assessment of a palladium SAC based on exfoliated carbon nitride in Suzuki-Miyaura cross-coupling using X-ray absorption spectroscopy. Our results confirm a surface-catalyzed mechanism, revealing the distinct electronic structure of active Pd centers compared to homogeneous systems, and providing insights into the stabilizing role of ligands and bases. This study establishes a valuable framework for advancing mechanistic understanding of organic syntheses catalyzed by SACs.
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Affiliation(s)
- Thomas Moragues
- Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, Zürich, 8093, Switzerland
| | - Georgios Giannakakis
- Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, Zürich, 8093, Switzerland
| | - Andrea Ruiz-Ferrando
- Institute of Chemical Research of Catalonia (ICIQ-CERCA), Av. Països Catalans 16, Tarragona, 43007, Spain
- University of Rovira i Virgili, Av. Catalunya 35, Tarragona, 43002, Spain
| | - Camelia N Borca
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen, 5232, Switzerland
| | - Thomas Huthwelker
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen, 5232, Switzerland
| | - Aram Bugaev
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen, 5232, Switzerland
| | - Andrew J de Mello
- Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, Zürich, 8093, Switzerland
| | - Javier Pérez-Ramírez
- Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, Zürich, 8093, Switzerland
| | - Sharon Mitchell
- Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, Zürich, 8093, Switzerland
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2
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Chen LX, Yano J. Deciphering Photoinduced Catalytic Reaction Mechanisms in Natural and Artificial Photosynthetic Systems on Multiple Temporal and Spatial Scales Using X-ray Probes. Chem Rev 2024; 124:5421-5469. [PMID: 38663009 DOI: 10.1021/acs.chemrev.3c00560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2024]
Abstract
Utilization of renewable energies for catalytically generating value-added chemicals is highly desirable in this era of rising energy demands and climate change impacts. Artificial photosynthetic systems or photocatalysts utilize light to convert abundant CO2, H2O, and O2 to fuels, such as carbohydrates and hydrogen, thus converting light energy to storable chemical resources. The emergence of intense X-ray pulses from synchrotrons, ultrafast X-ray pulses from X-ray free electron lasers, and table-top laser-driven sources over the past decades opens new frontiers in deciphering photoinduced catalytic reaction mechanisms on the multiple temporal and spatial scales. Operando X-ray spectroscopic methods offer a new set of electronic transitions in probing the oxidation states, coordinating geometry, and spin states of the metal catalytic center and photosensitizers with unprecedented energy and time resolution. Operando X-ray scattering methods enable previously elusive reaction steps to be characterized on different length scales and time scales. The methodological progress and their application examples collected in this review will offer a glimpse into the accomplishments and current state in deciphering reaction mechanisms for both natural and synthetic systems. Looking forward, there are still many challenges and opportunities at the frontier of catalytic research that will require further advancement of the characterization techniques.
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Affiliation(s)
- Lin X Chen
- Chemical Science and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Junko Yano
- Molecular Biophysics & Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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3
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Filimonova ON, Snigireva II, Thompson P, Wermeille D. Incorporation of palladium into pyrite: Insights from X-ray absorption spectroscopy analysis and modelling. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 920:170927. [PMID: 38369156 DOI: 10.1016/j.scitotenv.2024.170927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 02/09/2024] [Accepted: 02/10/2024] [Indexed: 02/20/2024]
Abstract
Pyrite (FeS2) often accommodates elevated concentrations of platinum-group elements in ores of magmatic and hydrothermal origin. In order to elucidate the role of pyrite in concentrating Pd, Pd-doped synthetic crystals were studied via X-ray absorption spectroscopy (XAS). Crystals were obtained by salt-flux method in the system saturated with respect to Pd at the temperature of 580 °C and sulphur fugacity of log f (S2) = -0.4. Scanning electron microscopy, electron probe microanalysis, and laser ablation inductively coupled plasma mass spectrometry studies demonstrated a uniform distribution of Pd within the pyrite crystals. The median and average values of Pd content of ∼0.7 ± 0.1 wt% were measured. Comparison of the Pd K-edge X-ray absorption near edge structure (XANES) spectra with the spectra of standards revealed that the formal oxidation state of Pd was close to +2. Fitting of the extended X-ray absorption fine structure (EXAFS) and Finite Difference Method for Near-Edge Structure (FDMNES) theoretical simulations of XANES spectra showed that Pd substituted for Fe in the crystal structure of pyrite. The isomorphous Pd in pyrite was octahedrally coordinated by S atoms at ∼2.385 Å. The PdS interatomic distance was 5.6 % larger than that of FeS due to the difference in their covalent radii of ∼5.3 %. The expansion caused by the incorporation of Pd into the pyrite structure disappeared at the distance of R > 3 Å. The information on the state of Pd in pyrite, including the local atomic environment and formal oxidation state, is essential for scientific and industrial purposes, e.g. physical-chemical modelling and improvement of leaching and extraction processing respectively.
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Affiliation(s)
- Olga N Filimonova
- The XMaS Beamline CRG c/o European Synchrotron Radiation Facility (ESRF), 71 avenue des Martyrs, 38000 Grenoble, France; Department of Physics, University of Liverpool, Oliver Lodge Laboratory, Liverpool L69 7ZE, UK.
| | | | - Paul Thompson
- The XMaS Beamline CRG c/o European Synchrotron Radiation Facility (ESRF), 71 avenue des Martyrs, 38000 Grenoble, France; Department of Physics, University of Liverpool, Oliver Lodge Laboratory, Liverpool L69 7ZE, UK
| | - Didier Wermeille
- The XMaS Beamline CRG c/o European Synchrotron Radiation Facility (ESRF), 71 avenue des Martyrs, 38000 Grenoble, France; Department of Physics, University of Liverpool, Oliver Lodge Laboratory, Liverpool L69 7ZE, UK
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4
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Borgstahl G, Azadmanesh J, Slobodnik K, Struble L, Lutz W, Coates L, Weiss K, Myles D, Kroll T. Revealing the atomic and electronic mechanism of human manganese superoxide dismutase product inhibition. RESEARCH SQUARE 2024:rs.3.rs-3880128. [PMID: 38405788 PMCID: PMC10889052 DOI: 10.21203/rs.3.rs-3880128/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/27/2024]
Abstract
Human manganese superoxide dismutase (MnSOD) is a crucial oxidoreductase that maintains the vitality of mitochondria by converting O 2 ∙ - to O 2 and H 2 O 2 with proton-coupled electron transfers (PCETs). Since changes in mitochondrial H 2 O 2 concentrations are capable of stimulating apoptotic signaling pathways, human MnSOD has evolutionarily gained the ability to be highly inhibited by its own product, H 2 O 2 . A separate set of PCETs is thought to regulate product inhibition, though mechanisms of PCETs are typically unknown due to difficulties in detecting the protonation states of specific residues that coincide with the electronic state of the redox center. To shed light on the underlying mechanism, we combined neutron diffraction and X-ray absorption spectroscopy of the product-bound, trivalent, and divalent states to reveal the all-atom structures and electronic configuration of the metal. The data identifies the product-inhibited complex for the first time and a PCET mechanism of inhibition is constructed.
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5
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Azadmanesh J, Slobodnik K, Struble LR, Lutz WE, Coates L, Weiss KL, Myles DAA, Kroll T, Borgstahl GEO. Revealing the atomic and electronic mechanism of human manganese superoxide dismutase product inhibition. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.26.577433. [PMID: 38328249 PMCID: PMC10849630 DOI: 10.1101/2024.01.26.577433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Human manganese superoxide dismutase (MnSOD) is a crucial oxidoreductase that maintains the vitality of mitochondria by converting O 2 ●- to O 2 and H 2 O 2 with proton-coupled electron transfers (PCETs). Since changes in mitochondrial H 2 O 2 concentrations are capable of stimulating apoptotic signaling pathways, human MnSOD has evolutionarily gained the ability to be highly inhibited by its own product, H 2 O 2 . A separate set of PCETs is thought to regulate product inhibition, though mechanisms of PCETs are typically unknown due to difficulties in detecting the protonation states of specific residues that coincide with the electronic state of the redox center. To shed light on the underlying mechanism, we combined neutron diffraction and X-ray absorption spectroscopy of the product-bound, trivalent, and divalent states to reveal the all-atom structures and electronic configuration of the metal. The data identifies the product-inhibited complex for the first time and a PCET mechanism of inhibition is constructed.
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6
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Rekhtina M, Bugaev A, Dunstan MT, Dal Pozzo A, Nadjafi M, Borca C, Huthwelker T, Abdala PM, Müller CR. Probing the Local Structure of Na in NaNO 3-Promoted, MgO-Based CO 2 Sorbents via X-ray Absorption Spectroscopy. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2023; 35:10060-10069. [PMID: 38107192 PMCID: PMC10720340 DOI: 10.1021/acs.chemmater.3c02077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 11/15/2023] [Accepted: 11/15/2023] [Indexed: 12/19/2023]
Abstract
This work provides insight into the local structure of Na in MgO-based CO2 sorbents that are promoted with NaNO3. To this end, we use X-ray absorption spectroscopy (XAS) at the Na K-edge to interrogate the local structure of Na during the CO2 capture (MgO + CO2 ↔ MgCO3). The analysis of Na K-edge XAS data shows that the local environment of Na is altered upon MgO carbonation when compared to that of NaNO3 in the as-prepared sorbent. We attribute the changes observed in the carbonated sorbent to an alteration in the local structure of Na at the NaNO3/MgCO3 interfaces and/or in the vicinity of [Mg2+···CO32-] ionic pairs that are trapped in the cooled NaNO3 melt. The changes observed are reversible, i.e., the local environment of NaNO3 was restored after a regeneration treatment to decompose MgCO3 to MgO. The ex situ Na K-edge XAS experiments were complemented by ex situ magic-angle spinning 23Na nuclear magnetic resonance (MAS 23Na NMR), Mg K-edge XAS and X-ray powder diffraction (XRD). These additional experiments support our interpretation of the Na K-edge XAS data. Furthermore, we develop in situ Na (and Mg) K-edge XAS experiments during the carbonation of the sorbent (NaNO3 is molten under the conditions of the in situ experiments). These in situ Na K-edge XANES spectra of molten NaNO3 open new opportunities to investigate the atomic scale structure of CO2 sorbents modified with Na-based molten salts by using XAS.
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Affiliation(s)
- Margarita Rekhtina
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Aram Bugaev
- Paul
Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - Matthew T. Dunstan
- Department
of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K.
| | - Alessandro Dal Pozzo
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
- Laboratory
of Industrial Safety and Environmental Sustainability, Department
of Civil, Chemical, Environmental and Materials Engineering, Alma
Mater, Studiorum—Università
di Bologna, Via Terracini
28, 40131 Bologna, Italy
| | - Manouchehr Nadjafi
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Camelia Borca
- Paul
Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - Thomas Huthwelker
- Paul
Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - Paula M. Abdala
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Christoph R. Müller
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
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7
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Tofoni A, Tavani F, Vandone M, Braglia L, Borfecchia E, Ghigna P, Stoian DC, Grell T, Stolfi S, Colombo V, D’Angelo P. Full Spectroscopic Characterization of the Molecular Oxygen-Based Methane to Methanol Conversion over Open Fe(II) Sites in a Metal-Organic Framework. J Am Chem Soc 2023; 145:21040-21052. [PMID: 37721732 PMCID: PMC10540213 DOI: 10.1021/jacs.3c07216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Indexed: 09/19/2023]
Abstract
Iron-based enzymes efficiently activate molecular oxygen to perform the oxidation of methane to methanol (MTM), a reaction central to the contemporary chemical industry. Conversely, a very limited number of artificial catalysts have been devised to mimic this process. Herein, we employ the MIL-100(Fe) metal-organic framework (MOF), a material that exhibits isolated Fe sites, to accomplish the MTM conversion using O2 as the oxidant under mild conditions. We apply a diverse set of advanced operando X-ray techniques to unveil how MIL-100(Fe) can act as a catalyst for direct MTM conversion. Single-phase crystallinity and stability of the MOF under reaction conditions (200 or 100 °C, CH4 + O2) are confirmed by X-ray diffraction measurements. X-ray absorption, emission, and resonant inelastic scattering measurements show that thermal treatment above 200 °C generates Fe(II) sites that interact with O2 and CH4 to produce methanol. Experimental evidence-driven density functional theory (DFT) calculations illustrate that the MTM reaction involves the oxidation of the Fe(II) sites to Fe(III) via a high-spin Fe(IV)═O intermediate. Catalyst deactivation is proposed to be caused by the escape of CH3• radicals from the relatively large MOF pore cages, ultimately resulting in the formation of hydroxylated triiron units, as proven by valence-to-core X-ray emission spectroscopy. The O2-based MTM catalytic activity of MIL-100(Fe) in the investigated conditions is demonstrated for two consecutive reaction cycles, proving the MOF potential toward active site regeneration. These findings will desirably lay the groundwork for the design of improved MOF catalysts for the MTM conversion.
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Affiliation(s)
- Alessandro Tofoni
- Dipartimento
di Chimica, Università degli Studi
di Roma “La Sapienza”, P.le A. Moro 5, I-00185 Rome, Italy
| | - Francesco Tavani
- Dipartimento
di Chimica, Università degli Studi
di Roma “La Sapienza”, P.le A. Moro 5, I-00185 Rome, Italy
| | - Marco Vandone
- Dipartimento
di Chimica & UdR INSTM di Milano, Università
degli Studi di Milano, Via Golgi 19, 20133 Milan, Italy
| | - Luca Braglia
- CNR-Istituto
Officina dei Materiali, TASC, 34149 Trieste, Italy
| | - Elisa Borfecchia
- Dipartimento
di Chimica & UdR INSTM di Torino, Università
di Torino, Via P. Giuria
7, 10125 Turin, Italy
| | - Paolo Ghigna
- Dipartimento
di Chimica, Università di Pavia, V.le Taramelli 13, I-27100 Pavia, Italy
| | - Dragos Costantin Stoian
- The Swiss-Norwegian
Beamlines (SNBL), European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France
| | - Toni Grell
- Dipartimento
di Chimica & UdR INSTM di Milano, Università
degli Studi di Milano, Via Golgi 19, 20133 Milan, Italy
| | - Sara Stolfi
- CNR-Istituto
Officina dei Materiali, TASC, 34149 Trieste, Italy
| | - Valentina Colombo
- Dipartimento
di Chimica & UdR INSTM di Milano, Università
degli Studi di Milano, Via Golgi 19, 20133 Milan, Italy
- CNR
− SCITEC − Istituto di Scienze e Tecnologie Chimiche
“Giulio Natta”, Via Golgi 19, 20133 Milan, Italy
| | - Paola D’Angelo
- Dipartimento
di Chimica, Università degli Studi
di Roma “La Sapienza”, P.le A. Moro 5, I-00185 Rome, Italy
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8
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Stępień J, Rybicki D, Sikora M, Bukowski Z, Babij M, Gondek Ł, Kapusta C, Strączek T, Goc K, Oliveira De Souza D. Effects of Ni/Co doping on structural and electronic properties of 122 and 112 families of Eu based iron pnictides. Sci Rep 2023; 13:13123. [PMID: 37573469 PMCID: PMC10423243 DOI: 10.1038/s41598-023-40419-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 08/09/2023] [Indexed: 08/14/2023] Open
Abstract
Superconductivity in high-temperature superconductors such as cuprates or iron pnictides is typically achieved by hole or electron doping and it is of great interest to understand how doping affects their properties leading to superconductivity. To study it we conducted Fe and As K edge x-ray absorption spectroscopy measurements on several electron doped compounds from the 112 and 122 family of Eu-based iron pnictides. XANES and EXAFS results confirm that dopants are located at expected sites. For both families we found an electron charge redistribution between As and Fe occurring with doping. The changes it caused are stronger in the 112 family and they are bigger at As sites, which indicates that doped charges are predominantly localized on the dopant site. However, the results obtained do not provide clues why Ni doping in 122 family does not lead to occurrence of superconductivity.
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Affiliation(s)
- Joanna Stępień
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059, Kraków, Poland
| | - Damian Rybicki
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059, Kraków, Poland.
| | - Marcin Sikora
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059, Kraków, Poland
| | - Zbigniew Bukowski
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422, Wrocław, Poland
| | - Michał Babij
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422, Wrocław, Poland
| | - Łukasz Gondek
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059, Kraków, Poland
| | - Czesław Kapusta
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059, Kraków, Poland
| | - Tomasz Strączek
- National Synchrotron Radiation Centre SOLARIS, Jagiellonian University, Czerwone Maki 98, 30-392, Kraków, Poland
| | - Kamil Goc
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059, Kraków, Poland
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9
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Martini A, Hursán D, Timoshenko J, Rüscher M, Haase F, Rettenmaier C, Ortega E, Etxebarria A, Roldan Cuenya B. Tracking the Evolution of Single-Atom Catalysts for the CO 2 Electrocatalytic Reduction Using Operando X-ray Absorption Spectroscopy and Machine Learning. J Am Chem Soc 2023; 145:17351-17366. [PMID: 37524049 PMCID: PMC10416299 DOI: 10.1021/jacs.3c04826] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Indexed: 08/02/2023]
Abstract
Transition metal-nitrogen-doped carbons (TMNCs) are a promising class of catalysts for the CO2 electrochemical reduction reaction. In particular, high CO2-to-CO conversion activities and selectivities were demonstrated for Ni-based TMNCs. Nonetheless, open questions remain about the nature, stability, and evolution of the Ni active sites during the reaction. In this work, we address this issue by combining operando X-ray absorption spectroscopy with advanced data analysis. In particular, we show that the combination of unsupervised and supervised machine learning approaches is able to decipher the X-ray absorption near edge structure (XANES) of the TMNCs, disentangling the contributions of different metal sites coexisting in the working TMNC catalyst. Moreover, quantitative structural information about the local environment of active species, including their interaction with adsorbates, has been obtained, shedding light on the complex dynamic mechanism of the CO2 electroreduction.
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Affiliation(s)
- Andrea Martini
- Department of Interface Science, Fritz-Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | | | - Janis Timoshenko
- Department of Interface Science, Fritz-Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Martina Rüscher
- Department of Interface Science, Fritz-Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Felix Haase
- Department of Interface Science, Fritz-Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Clara Rettenmaier
- Department of Interface Science, Fritz-Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Eduardo Ortega
- Department of Interface Science, Fritz-Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Ane Etxebarria
- Department of Interface Science, Fritz-Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Beatriz Roldan Cuenya
- Department of Interface Science, Fritz-Haber Institute of the Max Planck Society, 14195 Berlin, Germany
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10
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Fonseca A, Bugaev AL, Pnevskaya AY, Janssens K, Marquez C, De Vos D. Copper-cobalt double metal cyanides as green catalysts for phosphoramidate synthesis. Commun Chem 2023; 6:141. [PMID: 37407755 DOI: 10.1038/s42004-023-00927-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 06/08/2023] [Indexed: 07/07/2023] Open
Abstract
Phosphoramidates are common and widespread backbones of a great variety of fine chemicals, pharmaceuticals, additives and natural products. Conventional approaches to their synthesis make use of toxic chlorinated reagents and intermediates, which are sought to be avoided at an industrial scale. Here we report the coupling of phosphites and amines promoted by a Cu3[Co(CN)6]2-based double metal cyanide heterogeneous catalyst using I2 as additive for the synthesis of phosphoramidates. This strategy successfully provides an efficient, environmentally friendly alternative to the synthesis of these valuable compounds in high yields and it is, to the best of our knowledge, the first heterogeneous approach to this protocol. While the detailed study of the catalyst structure and of the metal centers by PXRD, FTIR, EXAFS and XANES revealed changes in their coordination environment, the catalyst maintained its high activity for at least 5 consecutive iterations of the reaction. Preliminary mechanism studies suggest that the reaction proceeds by a continuous change in the oxidation state of the Cu metal, induced by a O2/I- redox cycle.
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Affiliation(s)
- Alejandro Fonseca
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium
- Department of Polymer Engineering and Science, Polymer Processing, Montanuniversitaet Leoben, Otto Gloeckel-Strasse 2, 8700, Leoben, Austria
| | - Aram L Bugaev
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, Rostov-on-Don, 344090, Russia
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen, Switzerland
| | - Anna Yu Pnevskaya
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, Rostov-on-Don, 344090, Russia
| | - Kwinten Janssens
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium
| | - Carlos Marquez
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium.
| | - Dirk De Vos
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium.
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11
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Tofoni A, Tavani F, Persson I, D'Angelo P. P K-Edge XANES Calculations of Mineral Standards: Exploring the Potential of Theoretical Methods in the Analysis of Phosphorus Speciation. Inorg Chem 2023. [PMID: 37385975 DOI: 10.1021/acs.inorgchem.3c01346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/01/2023]
Abstract
Phosphorus K-edge X-ray absorption near-edge structure (XANES) spectroscopy is a technique routinely employed in the qualitative and quantitative analysis of phosphorus speciation in many scientific fields. The data analysis is, however, often performed in a qualitative manner, relying on linear combination fitting protocols or simple comparisons between the experimental data and the spectra of standards, and little quantitative structural and electronic information is thus retrieved. Herein, we report a thorough theoretical investigation of P K-edge XANES spectra of NaH2PO4·H2O, AlPO4, α-Ti(HPO4)2·H2O, and FePO4·2H2O showing excellent agreement with the experimental data. We find that different coordination shells of phosphorus, up to a distance of 5-6 Å from the photoabsorber, contribute to distinct features in the XANES spectra. This high structural sensitivity enables P K-edge XANES spectroscopy to even distinguish between nearly isostructural crystal phases of the same compound. Additionally, we provide a rationalization of the pre-edge transitions observed in the spectra of α-Ti(HPO4)2·H2O and FePO4·2H2O through density of states calculations. These pre-edge transitions are found to be enabled by the covalent mixing of phosphorus s and p orbitals and titanium or iron d orbitals, which happens even though neither metal ion is directly bound to phosphorus in the two systems.
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Affiliation(s)
- Alessandro Tofoni
- Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
| | - Francesco Tavani
- Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
| | - Ingmar Persson
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, SE-750 07 Uppsala, Sweden
| | - Paola D'Angelo
- Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
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12
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Falcone E, Nobili G, Okafor M, Proux O, Rossi G, Morante S, Faller P, Stellato F. Chasing the Elusive "In-Between" State of the Copper-Amyloid β Complex by X-ray Absorption through Partial Thermal Relaxation after Photoreduction. Angew Chem Int Ed Engl 2023; 62:e202217791. [PMID: 36869617 DOI: 10.1002/anie.202217791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 03/03/2023] [Accepted: 03/03/2023] [Indexed: 03/05/2023]
Abstract
The redox activity of Cu ions bound to the amyloid-β (Aβ) peptide is implicated as a source of oxidative stress in the context of Alzheimer's disease. In order to explain the efficient redox cycling between CuII -Aβ (distorted square-pyramidal) and CuI -Aβ (digonal) resting states, the existence of a low-populated "in-between" state, prone to bind Cu in both oxidation states, has been postulated. Here, we exploited the partial X-ray induced photoreduction at 10 K, followed by a thermal relaxation at 200 K, to trap and characterize by X-ray Absorption Spectroscopy (XAS) a partially reduced Cu-Aβ1-16 species different from the resting states. Remarkably, the XAS spectrum is well-fitted by a previously proposed model of the "in-between" state, hence providing the first direct spectroscopic characterization of an intermediate state. The present approach could be used to explore and identify the catalytic intermediates of other relevant metal complexes.
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Affiliation(s)
- Enrico Falcone
- Institut de Chimie (UMR 7177), University of Strasbourg, CNRS, 4 Rue Blaise Pascal, 67081, Strasbourg, France
| | - Germano Nobili
- Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
- INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
| | - Michael Okafor
- Institut de Chimie (UMR 7177), University of Strasbourg, CNRS, 4 Rue Blaise Pascal, 67081, Strasbourg, France
| | - Olivier Proux
- Observatoire des Sciences de l'Univers de Grenoble, UMS 832 CNRS-Université Grenoble Alpes, 38041, Grenoble, France
| | - Giancarlo Rossi
- Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
- INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
- Centro Fermi, Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Via Panisperna 89a, 00184, Roma, Italy
| | - Silvia Morante
- Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
- INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
| | - Peter Faller
- Institut de Chimie (UMR 7177), University of Strasbourg, CNRS, 4 Rue Blaise Pascal, 67081, Strasbourg, France
- Institut Universitaire de France (IUF), 1 rue Descartes, 75231, Paris, France
| | - Francesco Stellato
- Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
- INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
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13
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Wang Y, Cho A, Jia G, Cui X, Shin J, Nam I, Noh KJ, Park BJ, Huang R, Han JW. Tuning Local Coordination Environments of Manganese Single-Atom Nanozymes with Multi-Enzyme Properties for Selective Colorimetric Biosensing. Angew Chem Int Ed Engl 2023; 62:e202300119. [PMID: 36780128 DOI: 10.1002/anie.202300119] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 02/07/2023] [Accepted: 02/13/2023] [Indexed: 02/14/2023]
Abstract
Single-atom nanozymes (SAzymes) are promising in next-generation nanozymes, nevertheless, how to rationally modulate the microenvironment of SAzymes with controllable multi-enzyme properties is still challenging. Herein, we systematically investigate the relationship between atomic configuration and multi-enzymatic performances. The constructed MnSA -N3 -coordinated SAzymes (MnSA -N3 -C) exhibits much more remarkable oxidase-, peroxidase-, and glutathione oxidase-like activities than that of MnSA -N4 -C. Based on experimental and theoretical results, these multi-enzyme-like behaviors are highly dependent on the coordination number of single atomic Mn sites by local charge polarization. As a consequence, a series of colorimetric biosensing platforms based on MnSA -N3 -C SAzymes is successfully built for specific recognition of biological molecules. These findings provide atomic-level insight into the microenvironment of nanozymes, promoting rational design of other demanding biocatalysts.
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Affiliation(s)
- Ying Wang
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 37673 (Republic of, Korea
| | - Ara Cho
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 37673 (Republic of, Korea
| | - Guangri Jia
- State Key Laboratory of Automotive Simulation and Control, School of Materials Science and Engineering, Key Laboratory of Automobile Materials of MOE, Jilin University, Changchun, Jilin, 130012, China
| | - Xiaoqiang Cui
- State Key Laboratory of Automotive Simulation and Control, School of Materials Science and Engineering, Key Laboratory of Automobile Materials of MOE, Jilin University, Changchun, Jilin, 130012, China
| | - Junhyeop Shin
- School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Institute of Energy Converting Soft Materials, Chung-Ang University, Seoul, 06974 (Republic of, Korea
| | - Inho Nam
- School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Institute of Energy Converting Soft Materials, Chung-Ang University, Seoul, 06974 (Republic of, Korea
| | - Kyung-Jong Noh
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 37673 (Republic of, Korea
| | - Byoung Joon Park
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 37673 (Republic of, Korea
| | - Rui Huang
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 37673 (Republic of, Korea
| | - Jeong Woo Han
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 37673 (Republic of, Korea
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14
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Tasioula M, de Clermont Gallerande E, Theofanidis SA, Longo A, Lomachenko KA, Sahle C, Lemonidou AA. Tandem CO 2 Valorization and Ethane Dehydrogenation: Elucidating the Nature of Highly Selective Iron Oxide Active Sites. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Maria Tasioula
- Department of Chemical Engineering, Aristotle University of Thessaloniki, University Campus, 54124Thessaloniki, Greece
| | | | - Stavros A. Theofanidis
- Department of Chemical Engineering, Aristotle University of Thessaloniki, University Campus, 54124Thessaloniki, Greece
- AristEng S.à.r.l., 77, Rue de Merl, L-2146, Luxembourg City, Luxembourg
| | - Alessandro Longo
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000Grenoble, France
- Istituto per lo Studio dei Materiali Nanostrutturati (ISMN)-CNR, UOS Palermo, Via Ugo La Malfa, 153, 90146Palermo, Italy
| | - Kirill A. Lomachenko
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000Grenoble, France
| | - Christoph Sahle
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000Grenoble, France
| | - Angeliki A. Lemonidou
- Department of Chemical Engineering, Aristotle University of Thessaloniki, University Campus, 54124Thessaloniki, Greece
- Chemical Process & Energy Resource Institute, CPERI/CERTH, 57001Thermi, Thessaloniki, Greece
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15
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Salman MS, Yang Y, Zubair M, Bedford NM, Aguey‐Zinsou K. Core-shell NaBH 4 @Ni Nanoarchitectures: A Platform for Tunable Hydrogen Storage. CHEMSUSCHEM 2022; 15:e202200664. [PMID: 35723027 PMCID: PMC9542058 DOI: 10.1002/cssc.202200664] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 05/12/2022] [Indexed: 06/15/2023]
Abstract
The core-shell approach has surfaced as an attractive strategy to make complex hydrides reversible for hydrogen storage; however, no synthetic method exists for taking advantage of this approach. Here, a detailed investigation was undertaken to effectively design freestanding core-shell NaBH4 @Ni nanoarchitectures and correlate their hydrogen properties with structure and chemical composition. It was shown that the Ni shell growth on the surface of NaBH4 particles could be kinetically and thermodynamically controlled. The latter led to varied hydrogen properties. Near-edge X-ray absorption fine structure analysis confirmed that control over the Ni0 /Nix By concentrations upon NiII reduction led to a destabilized hydride system. Hydrogen release from the sphere, cube, and bar-like core-shell nanoarchitectures occurred at around 50, 90, and 95 °C, respectively, compared to the bulk (>500 °C). This core-shell approach, when extended to other hydrides, could open new avenues to decipher structure-property correlation in hydrogen storage/generation.
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Affiliation(s)
- Muhammad Saad Salman
- MERLinSchool of Chemical EngineeringThe University of New South WalesSydneyNSW 2052Australia
- MERLinSchool of ChemistryThe University of SydneySydneyNSW 2006Australia
| | - Yuwei Yang
- School of Chemical EngineeringThe University of New South WalesSydneyNSW 2052Australia
| | - Muhammad Zubair
- School of Chemical EngineeringThe University of New South WalesSydneyNSW 2052Australia
| | - Nicholas M. Bedford
- School of Chemical EngineeringThe University of New South WalesSydneyNSW 2052Australia
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16
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Tavani F, Busato M, Braglia L, Mauri S, Torelli P, D’Angelo P. Caught while Dissolving: Revealing the Interfacial Solvation of the Mg 2+ Ions on the MgO Surface. ACS APPLIED MATERIALS & INTERFACES 2022; 14:38370-38378. [PMID: 35968677 PMCID: PMC9412945 DOI: 10.1021/acsami.2c10005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 07/29/2022] [Indexed: 06/15/2023]
Abstract
Interfaces between water and materials are ubiquitous and are crucial in materials sciences and in biology, where investigating the interaction of water with the surface under ambient conditions is key to shedding light on the main processes occurring at the interface. Magnesium oxide is a popular model system to study the metal oxide-water interface, where, for sufficient water loadings, theoretical models have suggested that reconstructed surfaces involving hydrated Mg2+ metal ions may be energetically favored. In this work, by combining experimental and theoretical surface-selective ambient pressure X-ray absorption spectroscopy with multivariate curve resolution and molecular dynamics, we evidence in real time the occurrence of Mg2+ solvation at the interphase between MgO and solvating media such as water and methanol (MeOH). Further, we show that the Mg2+ surface ions undergo a reversible solvation process, we prove the dissolution/redeposition of the Mg2+ ions belonging to the MgO surface, and we demonstrate the formation of octahedral [Mg(H2O)6]2+ and [Mg(MeOH)6]2+ intermediate solvated species. The unique surface, electronic, and structural sensitivity of the developed technique may be beneficial to access often elusive properties of low-Z metal ion intermediates involved in interfacial processes of chemical and biological interest.
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Affiliation(s)
- Francesco Tavani
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, P.le A. Moro 5, 00185 Roma, Italy
| | - Matteo Busato
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, P.le A. Moro 5, 00185 Roma, Italy
| | - Luca Braglia
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Silvia Mauri
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
- Dipartimento
di Fisica, Università di Trieste, Via A. Valerio 2, 34127 Trieste, Italy
| | - Piero Torelli
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Paola D’Angelo
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, P.le A. Moro 5, 00185 Roma, Italy
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17
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Klein IM, Liu H, Nimlos D, Krotz A, Cushing SK. Ab Initio Prediction of Excited-State and Polaron Effects in Transient XUV Measurements of α-Fe 2O 3. J Am Chem Soc 2022; 144:12834-12841. [PMID: 35816667 DOI: 10.1021/jacs.2c03994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Transient X-ray and extreme ultraviolet (XUV) spectroscopies have become invaluable tools for studying photoexcited dynamics due to their sensitivity to carrier occupations and local chemical or structural changes. One of the most studied materials using transient XUV spectroscopy is α-Fe2O3 because of its rich photoexcited dynamics, including small polaron formation. The interpretation of carrier and polaron effects in α-Fe2O3 is currently carried out using a semi-empirical method that is not transferrable to most materials. Here, an ab initio, Bethe-Salpeter equation (BSE) approach is developed that can incorporate photoexcited-state effects into arbitrary material systems. The accuracy of this approach is proven by calculating the XUV absorption spectra for the ground, photoexcited, and polaron states of α-Fe2O3. Furthermore, the theoretical approach allows for the projection of the core-valence excitons and different components of the X-ray transition Hamiltonian onto the band structure, providing new insights into old measurements. From this information, a physical intuition about the origins and nature of the transient XUV spectra can be built. A route to extracting electron and hole energies is even shown possible for highly angular momentum split XUV peaks. This method is easily generalized to K, L, M, and N edges to provide a general approach for analyzing transient X-ray absorption or reflection data.
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Affiliation(s)
- Isabel M Klein
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Hanzhe Liu
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Danika Nimlos
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Alex Krotz
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Scott Kevin Cushing
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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18
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Shi J, Wei Y, Zhou D, Zhang L, Yang X, Miao Z, Qi H, Zhang S, Li A, Liu X, Yan W, Jiang Z, Wang A, Zhang T. Introducing Co–O Moiety to Co–N–C Single-Atom Catalyst for Ethylbenzene Dehydrogenation. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01873] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Jiajia Shi
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yao Wei
- University of Chinese Academy of Sciences, Beijing 100049, China
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
| | - Dan Zhou
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Leilei Zhang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xiaofeng Yang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Zhili Miao
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Haifeng Qi
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Shengxin Zhang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Anqi Li
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaoyan Liu
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Wensheng Yan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China
| | - Zheng Jiang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
| | - Aiqin Wang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Tao Zhang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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19
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Longo A, Giannici F, Casaletto MP, Rovezzi M, Sahle CJ, Glatzel P, Joly Y, Martorana A. Dynamic Role of Gold d-Orbitals during CO Oxidation under Aerobic Conditions. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05739] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alessandro Longo
- ESRF - The European Synchrotron, CS 40220, 38043 Cedex 9 Grenoble, France
- Istituto per lo Studio dei Materiali Nanostrutturati, Consiglio Nazionale delle Ricerche, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Francesco Giannici
- Dipartimento di Fisica e Chimica, Università di Palermo, Viale delle Scienze, I-90128 Palermo, Italy
| | - Maria Pia Casaletto
- Istituto per lo Studio dei Materiali Nanostrutturati, Consiglio Nazionale delle Ricerche, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Mauro Rovezzi
- ESRF - The European Synchrotron, CS 40220, 38043 Cedex 9 Grenoble, France
- Universitè Grenoble Alpes, CNRS, IRD, Irstea, Météo France, OSUG, FAME, 71 Avenue des Martyrs, CS 40220, 38043 Grenoble, France
| | - Christoph J. Sahle
- ESRF - The European Synchrotron, CS 40220, 38043 Cedex 9 Grenoble, France
| | - Pieter Glatzel
- ESRF - The European Synchrotron, CS 40220, 38043 Cedex 9 Grenoble, France
| | - Yves Joly
- Universitè Grenoble Alpes Inst NEEL, 38042 Grenoble (France) and CNRS, Inst NEEL, 38042 Grenoble, France
| | - Antonino Martorana
- Dipartimento di Fisica e Chimica, Università di Palermo, Viale delle Scienze, I-90128 Palermo, Italy
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20
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Formation of Co-O bonds and reversal of thermal annealing effects induced by X-ray irradiation in (Y, Co)-codoped CeO 2 nanocrystals. Sci Rep 2022; 12:1578. [PMID: 35091660 PMCID: PMC8799635 DOI: 10.1038/s41598-022-05691-0] [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: 10/14/2021] [Accepted: 01/17/2022] [Indexed: 11/21/2022] Open
Abstract
We report an unconventional effect of synchrotron X-ray irradiation in which Co–O bonds in thermally annealed (Y, Co)-codoped CeO2 nanocrystal samples were formed due to, instead of broken by, X-ray irradiation. Our experimental data indicate that escaping oxygen atoms from X-ray-broken Ce–O bonds may be captured by Co dopant atoms to form additional Co–O bonds. Consequently, the Co dopant atoms were pumped by X-rays from the energetically-favored thermally-stable Co-O4 square-planar structure to the metastable octahedral Co-O6 environment, practically a reversal of thermal annealing effects in (Y, Co)-codoped CeO2 nanocrystals. The band gap of doped CeO2 with Co dopant in the Co-O6 structure was previously found to be 1.61 eV higher than that with Co in the Co-O4 environment. Therefore, X-ray irradiation can work with thermal annealing in opposing directions to fine tune and optimize the band gap of the material for specific technological applications.
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21
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Vogt M, Smolentsev G. Time‐Resolved X‐Ray Spectroscopy to Study Luminophores with Relevance for OLEDs. CHEMPHOTOCHEM 2022. [DOI: 10.1002/cptc.202100180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Matthias Vogt
- Fakultät für Naturwissenschaften II, Institut für Chemie Martin-Luther-Universität Halle-Wittenberg Kurt-Mothes-Str. 2 06120 Halle (Saale) Germany
| | - Grigory Smolentsev
- Energy and Environment Research Division Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen-PSI Switzerland
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22
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Shittu TD, Ayodele OB. Catalysis of semihydrogenation of acetylene to ethylene: current trends, challenges, and outlook. Front Chem Sci Eng 2022. [DOI: 10.1007/s11705-021-2113-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Chiara A, Canu G, Longo A, Pipitone C, Martorana A, Giannici F. Solid-state compatibility of Ca:LaNbO4 with perovskite cathodes: Evidences from X-ray microspectroscopy. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2021.139495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Tavani F, Fracchia M, Tofoni A, Braglia L, Jouve A, Morandi S, Manzoli M, Torelli P, Ghigna P, D'Angelo P. Structural and mechanistic insights into low-temperature CO oxidation over a prototypical high entropy oxide by Cu L-edge operando soft X-ray absorption spectroscopy. Phys Chem Chem Phys 2021; 23:26575-26584. [PMID: 34812450 DOI: 10.1039/d1cp03946f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High entropy oxides (HEOs) are an emerging class of materials constituted by multicomponent systems that are receiving special interest as candidates for obtaining novel and desirable properties. In this study we present a detailed investigation of the relevant intermediates arising at the surface of the prototypical HEO Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O during low-temperature CO oxidation. By combining Cu L2,3-edge operando soft X-ray absorption spectroscopy (soft-XAS) with density functional theory simulations and in situ FT-IR spectroscopy, we propose that upon HEO exposure to CO at 235 °C reduced Cu(I) sites arise mostly coordinated to activated CO molecules and partly to bidentate carbonate species. When the HEO surface is then exposed to a stoichiometric mixture of CO + 1/2O2 at 250 °C, CO2 is produced while bidentate carbonate moieties remain interacting with the Cu(I) sites. We structurally characterize the carbonate and CO preferential adsorption geometries on the Cu(I) surface metal centers, and find that CO adopts a bent conformation that may energetically favor its subsequent oxidation. The unique surface, structural and electronic sensitivity of soft-XAS coupled with the developed data analysis work-flow and supported by FT-IR spectroscopy may be beneficial to characterize often elusive surface properties of systems of catalytic interest.
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Affiliation(s)
- Francesco Tavani
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
| | - Martina Fracchia
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 16, 27100 Pavia, Italy
| | - Alessandro Tofoni
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
| | - Luca Braglia
- CNR - Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Andrea Jouve
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Via P. Giuria 9, 10125, Torino, Italy
| | - Sara Morandi
- Dipartimento di Chimica, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy
| | - Maela Manzoli
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Via P. Giuria 9, 10125, Torino, Italy
| | - Piero Torelli
- CNR - Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Paolo Ghigna
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 16, 27100 Pavia, Italy
| | - Paola D'Angelo
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
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25
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Dokania A, Ould-Chikh S, Ramirez A, Cerrillo JL, Aguilar A, Russkikh A, Alkhalaf A, Hita I, Bavykina A, Shterk G, Wehbe N, Prat A, Lahera E, Castaño P, Fonda E, Hazemann JL, Gascon J. Designing a Multifunctional Catalyst for the Direct Production of Gasoline-Range Isoparaffins from CO 2. JACS AU 2021; 1:1961-1974. [PMID: 34841412 PMCID: PMC8611669 DOI: 10.1021/jacsau.1c00317] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Indexed: 06/13/2023]
Abstract
The production of carbon-neutral fuels from CO2 presents an avenue for causing an appreciable effect in terms of volume toward the mitigation of global carbon emissions. To that end, the production of isoparaffin-rich fuels is highly desirable. Here, we demonstrate the potential of a multifunctional catalyst combination, consisting of a methanol producer (InCo) and a Zn-modified zeolite beta, which produces a mostly isoparaffinic hydrocarbon mixture from CO2 (up to ∼85% isoparaffin selectivity among hydrocarbons) at a CO2 conversion of >15%. The catalyst combination was thoroughly characterized via an extensive complement of techniques. Specifically, operando X-ray absorption spectroscopy (XAS) reveals that Zn (which plays a crucial role of providing a hydrogenating function, improving the stability of the overall catalyst combination and isomerization performance) is likely present in the form of Zn6O6 clusters within the zeolite component, in contrast to previously reported estimations.
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Affiliation(s)
- Abhay Dokania
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
| | - Samy Ould-Chikh
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
| | - Adrian Ramirez
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
| | - Jose Luis Cerrillo
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
| | - Antonio Aguilar
- Institut
Neel, UPR 2940 CNRS-Université Grenoble Alpes, F-38000 Grenoble, France
| | - Artem Russkikh
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
| | - Ahmed Alkhalaf
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
| | - Idoia Hita
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
| | - Anastasiya Bavykina
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
| | - Genrikh Shterk
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
| | - Nimer Wehbe
- King
Abdullah University of Science and Technology, Imaging and Characterization Core Laboratories, Thuwal 23955, Saudi Arabia
| | - Alain Prat
- Institut
Neel, UPR 2940 CNRS-Université Grenoble Alpes, F-38000 Grenoble, France
| | - Eric Lahera
- OSUG,
UMS 832 CNRS-Université Grenoble Alpes, F-38041 Grenoble, France
| | - Pedro Castaño
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
| | - Emiliano Fonda
- Synchrotron
SOLEIL, L’orme des Merisiers, BP 48 Saint Aubin, 91192 Gif-sur-Yvette, France
| | - Jean-Louis Hazemann
- Institut
Neel, UPR 2940 CNRS-Université Grenoble Alpes, F-38000 Grenoble, France
| | - Jorge Gascon
- King
Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Thuwal 23955, Saudi Arabia
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Martini A, Guda AA, Guda SA, Bugaev AL, Safonova OV, Soldatov AV. Machine learning powered by principal component descriptors as the key for sorted structural fit of XANES. Phys Chem Chem Phys 2021; 23:17873-17887. [PMID: 34378592 DOI: 10.1039/d1cp01794b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Modern synchrotron radiation sources and free electron laser made X-ray absorption spectroscopy (XAS) an analytical tool for the structural analysis of materials under in situ or operando conditions. Fourier approach applied to the extended region of the XAS spectrum (EXAFS) allows the estimation of the number of structural and non-structural parameters which can be refined through a fitting procedure. The near edge region of the XAS spectrum (XANES) is also sensitive to the coordinates of all the atoms in the local cluster around the absorbing atom. However, in contrast to EXAFS, the existing approaches of quantitative analysis provide no estimation for the number of structural parameters that can be evaluated for a given XANES spectrum. This problem exists both for the classical gradient descent approaches and for modern machine learning methods based on neural networks. We developed a new approach for rational fit based on principal component descriptors of the spectrum. In this work the principal component analysis (PCA) is applied to a dataset of theoretical spectra calculated a priori on a grid of variable structural parameters of a molecule or cluster. Each principal component of the dataset is related then to a combined variation of several structural parameters, similar to the vibrational normal mode. Orthogonal principal components determine orthogonal deformations that can be extracted independently upon the analysis of the XANES spectrum. Applying statistical criteria, the PCA-based fit of the XANES determines the accessible structural information in the spectrum for a given system.
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Affiliation(s)
- A Martini
- The Smart Materials Research Institute, Southern Federal University, 344090 Sladkova 178/24, Rostov-on-Don, Russia.
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Jajko G, Kozyra P, Strzempek M, Indyka P, Zając M, Witkowski S, Piskorz W. Structural Studies of Aluminated form of Zeolites-EXAFS and XRD Experiment, STEM Micrography, and DFT Modelling. Molecules 2021; 26:3566. [PMID: 34200976 PMCID: PMC8230598 DOI: 10.3390/molecules26123566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/27/2021] [Accepted: 06/07/2021] [Indexed: 11/30/2022] Open
Abstract
In this article, the results of computational structural studies on Al-containing zeolites, via periodic DFT + D modelling and FDM (Finite Difference Method) to solve the Schrödinger equation (FDMNES) for XAS simulations, corroborated by EXAFS (Extended X-ray Absorption Fine Structure) spectroscopy and PXRD (powder X-ray diffractometry), are presented. The applicability of Radial Distribution Function (RDF) to screen out the postulated zeolite structure is also discussed. The structural conclusions are further verified by HR-TEM imaging.
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Affiliation(s)
- Gabriela Jajko
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Kraków, Poland; (G.J.); (P.K.); (M.S.); (P.I.); (S.W.)
| | - Paweł Kozyra
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Kraków, Poland; (G.J.); (P.K.); (M.S.); (P.I.); (S.W.)
| | - Maciej Strzempek
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Kraków, Poland; (G.J.); (P.K.); (M.S.); (P.I.); (S.W.)
| | - Paulina Indyka
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Kraków, Poland; (G.J.); (P.K.); (M.S.); (P.I.); (S.W.)
- Małopolska Centre of Biotechnology, ul. Gronostajowa 7A, 30-387 Kraków, Poland
| | - Marcin Zając
- National Synchrotron Radiation Centre SOLARIS, Jagiellonian University, ul. Czerwone Maki 98, 30-392 Kraków, Poland;
| | - Stefan Witkowski
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Kraków, Poland; (G.J.); (P.K.); (M.S.); (P.I.); (S.W.)
| | - Witold Piskorz
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Kraków, Poland; (G.J.); (P.K.); (M.S.); (P.I.); (S.W.)
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Wielinski J, Voegelin A, Grobéty B, Müller CR, Morgenroth E, Kaegi R. Transformation of TiO 2 (nano)particles during sewage sludge incineration. JOURNAL OF HAZARDOUS MATERIALS 2021; 411:124932. [PMID: 33858078 DOI: 10.1016/j.jhazmat.2020.124932] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Revised: 12/18/2020] [Accepted: 12/19/2020] [Indexed: 06/12/2023]
Abstract
Titanium dioxide (TiO2) (nano)particles are produced in large quantities and their potential impacts on ecosystems warrants investigations into their fate after disposal. TiO2 particles released into wastewater are retained by wastewater treatment plants and accumulate in digested sludge, which is increasingly incinerated in industrialized countries. Therefore, we investigated the changes of the Ti-speciation during incineration of as-received sludge and of sludge spiked with anatase (d=20-50 nm) or rutile (d=200-400 nm) using X-ray absorption spectroscopy (XAS) and transmission electron microscopy (TEM). In the as-received sludge, rutile and anatase were the dominant Ti bearing minerals and both remained unaffected by the anaerobic treatment. During incineration, Ti reacts with hematite to members of the hematite-ilmenite solid solution series (Hem-Ilm). Up to 80% of the Ti spiked as anatase transformed into Hem-Ilm, a distorted 6-fold coordinated Ti (Ti(IV)sulfate) and rutile during incineration. Up to 30% and 60% of rutile transformed into Hem-Ilm and Ti(IV)sulfate represented phases in fly and bottom ash, respectively. Fe and Ti were spatially correlated in ash derived from as-received and anatase spiked sludge, whereas only a thin layer of the spiked rutile reacted with Fe, in line with XAS data. This study highlights the transient nature of nano-Ti species during sewage sludge incineration.
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Affiliation(s)
- Jonas Wielinski
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland; ETH Zürich, Institute of Environmental Engineering, 8093 Zürich, Switzerland
| | - Andreas Voegelin
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
| | - Bernard Grobéty
- University of Fribourg, Department of Geosciences, 1700 Fribourg, Switzerland
| | - Christoph R Müller
- ETH Zürich, Department of Mechanical and Process Engineering, 8092 Zürich, Switzerland
| | - Eberhard Morgenroth
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland; ETH Zürich, Institute of Environmental Engineering, 8093 Zürich, Switzerland
| | - Ralf Kaegi
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland.
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Cook M, Etschmann B, Ram R, Ignatyev K, Gervinskas G, Conradson SD, Cumberland S, Wong VNL, Brugger J. The nature of Pu-bearing particles from the Maralinga nuclear testing site, Australia. Sci Rep 2021; 11:10698. [PMID: 34021195 PMCID: PMC8139974 DOI: 10.1038/s41598-021-89757-5] [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: 11/29/2020] [Accepted: 04/20/2021] [Indexed: 11/15/2022] Open
Abstract
The high-energy release of plutonium (Pu) and uranium (U) during the Maralinga nuclear trials (1955–1963) in Australia, designed to simulate high temperature, non-critical nuclear accidents, resulted in wide dispersion µm-sized, radioactive, Pu–U-bearing ‘hot’ particles that persist in soils. By combining non-destructive, multi-technique synchrotron-based micro-characterization with the first nano-scale imagining of the composition and textures of six Maralinga particles, we find that all particles display intricate physical and chemical make-ups consistent with formation via condensation and cooling of polymetallic melts (immiscible Fe–Al–Pu–U; and Pb ± Pu–U) within the detonation plumes. Plutonium and U are present predominantly in micro- to nano-particulate forms, and most hot particles contain low valence Pu–U–C compounds; these chemically reactive phases are protected by their inclusion in metallic alloys. Plutonium reworking was observed within an oxidised rim in a Pb-rich particle; however overall Pu remained immobile in the studied particles, while small-scale oxidation and mobility of U is widespread. It is notoriously difficult to predict the long-term environmental behaviour of hot particles. Nano-scale characterization of the hot particles suggests that long-term, slow release of Pu from the hot particles may take place via a range of chemical and physical processes, likely contributing to on-going Pu uptake by wildlife at Maralinga.
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Affiliation(s)
- Megan Cook
- School of Earth, Atmosphere and Environment, Monash University, Clayton, Australia
| | - Barbara Etschmann
- School of Earth, Atmosphere and Environment, Monash University, Clayton, Australia.
| | - Rahul Ram
- School of Earth, Atmosphere and Environment, Monash University, Clayton, Australia
| | - Konstantin Ignatyev
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxon, OX11 0QX, United Kingdom
| | - Gediminas Gervinskas
- Ramaciotti Centre for Cryo-Electron Microscopy, Monash University, Clayton, Australia
| | - Steven D Conradson
- Department of Chemistry, Washington State University, Pullman, WA, USA.,Department of Complex Matter, Josef Stefan Institute, Ljubljana, Slovenia
| | | | - Vanessa N L Wong
- School of Earth, Atmosphere and Environment, Monash University, Clayton, Australia
| | - Joёl Brugger
- School of Earth, Atmosphere and Environment, Monash University, Clayton, Australia.
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Vlasenko VG, Guda AA, Starikov AG, Chegerev MG, Piskunov AV, Ershova IV, Trigub AL, Tereshchenko AA, Rusalev YV, Kubrin SP, Soldatov AV. Structural Changes in Five‐Coordinate Bromido‐bis(o‐iminobenzo‐semiquinonato)iron(III) Complex: Spin‐Crossover or Ligand‐Metal Antiferromagnetic Interactions? Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202001033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Valery G. Vlasenko
- Research Institute of Physics Southern Federal University 194 Stachki Ave. 344090 Rostov-on-Don Russia
| | - Alexander A. Guda
- The Smart Materials Research Institute Southern Federal University 178/24 A. Sladkova street 344090 Rostov-on-Don Russia
| | - Andrey G. Starikov
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachki Ave. 344090 Rostov-on-Don Russia
| | - Maxim G. Chegerev
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachki Ave. 344090 Rostov-on-Don Russia
| | - Alexander V. Piskunov
- G. A. Razuvaev Institute of Organometallic Chemistry Russian Academy of Sciences 49 Tropinina Str. 603950 Nizhny Novgorod Russia
| | - Irina V. Ershova
- G. A. Razuvaev Institute of Organometallic Chemistry Russian Academy of Sciences 49 Tropinina Str. 603950 Nizhny Novgorod Russia
| | - Alexander L. Trigub
- National Research Center “Kurchatov Institute” 1 pl. Academician Kurchatov 123182 Moscow Russia
| | - Andrei A. Tereshchenko
- The Smart Materials Research Institute Southern Federal University 178/24 A. Sladkova street 344090 Rostov-on-Don Russia
| | - Yurii V. Rusalev
- The Smart Materials Research Institute Southern Federal University 178/24 A. Sladkova street 344090 Rostov-on-Don Russia
| | - Stanislav P. Kubrin
- Research Institute of Physics Southern Federal University 194 Stachki Ave. 344090 Rostov-on-Don Russia
| | - Alexander V. Soldatov
- The Smart Materials Research Institute Southern Federal University 178/24 A. Sladkova street 344090 Rostov-on-Don Russia
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Yalovega GE, Kremennaya MA. Structural Diagnostics of Biological Systems Based on X-Ray Absorption Spectroscopy. CRYSTALLOGR REP+ 2020. [DOI: 10.1134/s1063774520060395] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Cuartero V, Monteseguro V, Otero-de-la-Roza A, El Idrissi M, Mathon O, Shinmei T, Irifune T, Sanson A. Interplay between local structure, vibrational and electronic properties on CuO under pressure. Phys Chem Chem Phys 2020; 22:24299-24309. [PMID: 33094300 DOI: 10.1039/d0cp04878j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electronic and local structural properties of CuO under pressure have been investigated by means of X-ray absorption spectroscopy (XAS) at Cu K edge and ab initio calculations, up to 17 GPa. The crystal structure of CuO consists of Cu motifs within CuO4 square planar units and two elongated apical Cu-O bonds. The CuO4 square planar units are stable in the studied pressure range, with Cu-O distances that are approximately constant up to 5 GPa, and then decrease slightly up to 17 GPa. In contrast, the elongated Cu-O apical distances decrease continuously with pressure in the studied range. An anomalous increase of the mean square relative displacement (EXAFS Debye-Waller, σ2) of the elongated Cu-O path is observed from 5 GPa up to 13 GPa, when a drastic reduction takes place in σ2. This is interpreted in terms of local dynamic disorder along the apical Cu-O path. At higher pressures (P > 13 GPa), the local structure of Cu2+ changes from a 4-fold square planar to a 4+2 Jahn-Teller distorted octahedral ion. We interpret these results in terms of the tendency of the Cu2+ ion to form favorable interactions with the apical O atoms. Also, the decrease in Cu-O apical distance caused by compression softens the normal mode associated with the out-of-plane Cu movement. CuO is predicted to have an anomalous rise in permittivity with pressure as well as modest piezoelectricity in the 5-13 GPa pressure range. In addition, the near edge features in our XAS experiment show a discontinuity and a change of tendency at 5 GPa. For P < 5 GPa the evolution of the edge shoulder is ascribed to purely electronic effects which also affect the charge transfer integral. This is linked to a charge migration from the Cu to O, but also to an increase of the energy band gap, which show a change of tendency occurring also at 5 GPa.
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Affiliation(s)
- Vera Cuartero
- Centro Universitario de la Defensa de Zaragoza, Ctra. Huesca s/n, 50090 Zaragoza, Spain.
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Podkovyrina YS, Butova VV, Bulanova EA, Reshetnikova EA, Soldatov AV, Lamberti C. XAFS investigation of Co/Zn based ZIFs after I2, Cl2 and Br2 adsorption. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.02.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Pankin I, Borfecchia E, Martini A, Lomachenko K, Lamberti C, Soldatov A. DFT-assisted XANES simulations to discriminate different monomeric CuII species in CHA catalysts. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.108510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Guda A, Guda S, Martini A, Bugaev A, Soldatov M, Soldatov A, Lamberti C. Machine learning approaches to XANES spectra for quantitative 3D structural determination: The case of CO2 adsorption on CPO-27-Ni MOF. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.108430] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kirichkov MV, Guda AA, Budnyk AP, Bugaev AL, Lastovina TA, Shapovalov VV, Guda SA, Trigub AL, Rusalev YV, Chernyshev AV, Lamberti C, Soldatov AV. X-ray and optical characterization of the intermediate products in the Au3+ reduction process by oleylamine. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2018.11.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Liu Y, Tan L, Cibin G, Gianolio D, Han S, Yu K, Dove MT, Sapelkin AV. Analysis of the atomic structure of CdS magic-size clusters by X-ray absorption spectroscopy. NANOSCALE 2020; 12:19325-19332. [PMID: 32936194 DOI: 10.1039/d0nr05186a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Magic-size clusters are ultra-small colloidal semiconductor systems that are intensively studied due to their monodisperse nature and sharp UV-vis absorption peak compared with regular quantum dots. However, the small size of such clusters (<2 nm), and the large surface-to-bulk ratio significantly limit characterisation techniques that can be utilised. Here we demonstrate how a combination of EXAFS and XANES analyses can be used to obtain information about sample stoichiometry and cluster symmetry. Investigating two types of clusters that show sharp UV-vis absorption peaks at 311 nm and 322 nm, we found that both samples possess approximately 2 : 1 Cd : S ratio and have similar nearest-neighbour structural arrangements. However, both samples demonstrate a significant departure from the tetrahedral structural arrangement, with an average bond angle determined to be around 106.1° showing a bi-fold bond angle distribution. Our results suggest that both samples are quasi-isomers - their core structures have identical chemical compositions, but different atomic arrangements with distinct bond angle distributions.
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Affiliation(s)
- Ying Liu
- Centre of Condensed Matter and Materials Physics, Queen Mary University of London, Mile End Road, E1 4NS, London, UK.
| | - Lei Tan
- Centre of Condensed Matter and Materials Physics, Queen Mary University of London, Mile End Road, E1 4NS, London, UK.
| | - Giannantonio Cibin
- Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK
| | - Diego Gianolio
- Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK
| | - Shuo Han
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, People's Republic of China
| | - Kui Yu
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, People's Republic of China
| | - Martin T Dove
- Centre of Condensed Matter and Materials Physics, Queen Mary University of London, Mile End Road, E1 4NS, London, UK. and Department of Physics, School of Sciences, Wuhan University of Technology, 205 Luoshi Road, Hongshan District, Wuhan, Hubei 430070, People's Republic of China and College of Computer Science, Sichuan University, Chengdu 610065, People's Republic of China
| | - Andrei V Sapelkin
- Centre of Condensed Matter and Materials Physics, Queen Mary University of London, Mile End Road, E1 4NS, London, UK.
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Usoltsev OA, Pnevskaya AY, Kamyshova EG, Tereshchenko AA, Skorynina AA, Zhang W, Yao T, Bugaev AL, Soldatov AV. Dehydrogenation of Ethylene on Supported Palladium Nanoparticles: A Double View from Metal and Hydrocarbon Sides. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1643. [PMID: 32825750 PMCID: PMC7560039 DOI: 10.3390/nano10091643] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 08/10/2020] [Accepted: 08/18/2020] [Indexed: 02/03/2023]
Abstract
Adsorption of ethylene on palladium, a key step in various catalytic reactions, may result in a variety of surface-adsorbed species and formation of palladium carbides, especially under industrially relevant pressures and temperatures. Therefore, the application of both surface and bulk sensitive techniques under reaction conditions is important for a comprehensive understanding of ethylene interaction with Pd-catalyst. In this work, we apply in situ X-ray absorption spectroscopy, X-ray diffraction and infrared spectroscopy to follow the evolution of the bulk and surface structure of an industrial catalysts consisting of 2.6 nm supported palladium nanoparticles upon exposure to ethylene under atmospheric pressure at 50 °C. Experimental results were complemented by ab initio simulations of atomic structure, X-ray absorption spectra and vibrational spectra. The adsorbed ethylene was shown to dehydrogenate to C2H3, C2H2 and C2H species, and to finally decompose to palladium carbide. Thus, this study reveals the evolution pathway of ethylene on industrial Pd-catalyst under atmospheric pressure at moderate temperatures, and provides a conceptual framework for the experimental and theoretical investigation of palladium-based systems, in which both surface and bulk structures exhibit a dynamic nature under reaction conditions.
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Affiliation(s)
- Oleg A. Usoltsev
- The Smart Materials Research Institute, Southern Federal University, 178/24 Sladkova, 344090 Rostov-on-Don, Russia; (O.A.U.); (A.Y.P.); (E.G.K.); (A.A.T.); (A.A.S.); (A.V.S.)
| | - Anna Yu. Pnevskaya
- The Smart Materials Research Institute, Southern Federal University, 178/24 Sladkova, 344090 Rostov-on-Don, Russia; (O.A.U.); (A.Y.P.); (E.G.K.); (A.A.T.); (A.A.S.); (A.V.S.)
| | - Elizaveta G. Kamyshova
- The Smart Materials Research Institute, Southern Federal University, 178/24 Sladkova, 344090 Rostov-on-Don, Russia; (O.A.U.); (A.Y.P.); (E.G.K.); (A.A.T.); (A.A.S.); (A.V.S.)
| | - Andrei A. Tereshchenko
- The Smart Materials Research Institute, Southern Federal University, 178/24 Sladkova, 344090 Rostov-on-Don, Russia; (O.A.U.); (A.Y.P.); (E.G.K.); (A.A.T.); (A.A.S.); (A.V.S.)
| | - Alina A. Skorynina
- The Smart Materials Research Institute, Southern Federal University, 178/24 Sladkova, 344090 Rostov-on-Don, Russia; (O.A.U.); (A.Y.P.); (E.G.K.); (A.A.T.); (A.A.S.); (A.V.S.)
| | - Wei Zhang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China; (W.Z.); (T.Y.)
| | - Tao Yao
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China; (W.Z.); (T.Y.)
| | - Aram L. Bugaev
- The Smart Materials Research Institute, Southern Federal University, 178/24 Sladkova, 344090 Rostov-on-Don, Russia; (O.A.U.); (A.Y.P.); (E.G.K.); (A.A.T.); (A.A.S.); (A.V.S.)
| | - Alexander V. Soldatov
- The Smart Materials Research Institute, Southern Federal University, 178/24 Sladkova, 344090 Rostov-on-Don, Russia; (O.A.U.); (A.Y.P.); (E.G.K.); (A.A.T.); (A.A.S.); (A.V.S.)
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Spectral Decomposition of X-ray Absorption Spectroscopy Datasets: Methods and Applications. CRYSTALS 2020. [DOI: 10.3390/cryst10080664] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
X-ray absorption spectroscopy (XAS) today represents a widespread and powerful technique, able to monitor complex systems under in situ and operando conditions, while external variables, such us sampling time, sample temperature or even beam position over the analysed sample, are varied. X-ray absorption spectroscopy is an element-selective but bulk-averaging technique. Each measured XAS spectrum can be seen as an average signal arising from all the absorber-containing species/configurations present in the sample under study. The acquired XAS data are thus represented by a spectroscopic mixture composed of superimposed spectral profiles associated to well-defined components, characterised by concentration values evolving in the course of the experiment. The decomposition of an experimental XAS dataset in a set of pure spectral and concentration values is a typical example of an inverse problem and it goes, usually, under the name of multivariate curve resolution (MCR). In the present work, we present an overview on the major techniques developed to realize the MCR decomposition together with a selection of related results, with an emphasis on applications in catalysis. Therein, we will highlight the great potential of these methods which are imposing as an essential tool for quantitative analysis of large XAS datasets as well as the directions for further development in synergy with the continuous instrumental progresses at synchrotron sources.
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Potsi G, Wu J, Portale G, Gengler RYN, Longo A, Gournis D, Rudolf P. Fabrication of highly ordered Cu 2+/Fe 3+ decorated polyhedral oligomeric silsesquioxane hybrids: How metal coordination influences structure. J Colloid Interface Sci 2020; 572:207-215. [PMID: 32244081 DOI: 10.1016/j.jcis.2020.03.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Revised: 02/17/2020] [Accepted: 03/08/2020] [Indexed: 11/25/2022]
Abstract
Incorporation of isolated metal centers into well-organized nanostructures is a promising route in the development of the next generation of chemical, magnetic and electronic devices. In this work, a layer-by-layer protocol to grow highly ordered thin films of metal-decorated organic-inorganic cage-like polyhedral oligomeric silsesquioxane (POSS) is introduced. The key strategy is to use metal ions (Cu2+ or Fe3+) as linker for the amino-functionalized cage-like POSS, which are self-assembled between arachidic acid layers during Langmuir-Schaefer deposition. The Langmuir-Schaefer films are examined by X-ray photoelectron spectroscopy, X-ray diffraction, grazing incidence wide-angle X-ray scattering and extended X-ray absorption fine structure in order to understand how the coordination of metal ions influences the structure in the course of the layer-by-layer formation of the films.
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Affiliation(s)
- Georgia Potsi
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands; Department of Materials Science & Engineering, University of Ioannina, GR-45110 Ioannina, Greece
| | - Jiquan Wu
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands
| | - Giuseppe Portale
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands
| | - Regis Y N Gengler
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands
| | - Alessandro Longo
- Department of Materials, Textiles and Chemical Engineering Technologiepark 125, 9052 University of Ghent, Belgium; Istituto per lo Studio dei Materiali Nanostrutturati (ISMN)-CNR, UOS Palermo, Via Ugo La Malfa, 153, 90146 Palermo, Italy
| | - Dimitrios Gournis
- Department of Materials Science & Engineering, University of Ioannina, GR-45110 Ioannina, Greece.
| | - Petra Rudolf
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands.
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Synthesis of ZnO Nanoparticles Doped with Cobalt Using Bimetallic ZIFs as Sacrificial Agents. NANOMATERIALS 2020; 10:nano10071275. [PMID: 32629755 PMCID: PMC7408057 DOI: 10.3390/nano10071275] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 06/24/2020] [Accepted: 06/26/2020] [Indexed: 01/18/2023]
Abstract
We report here a simple two-stage synthesis of zinc–cobalt oxide nanoparticles. We used Zn/Co-zeolite imidazolate framework (ZIF)-8 materials as precursors for annealing and optional impregnation with a silicon source for the formation of a protective layer on the surface of oxide nanoparticles. Using bimetallic ZIFs allowed us to trace the phase transition of the obtained oxide nanoparticles from wurtzite ZnO to spinel Co3O4 structures. Using (X-ray diffraction) XRD and (X-ray Absorption Near Edge Structure) XANES techniques, we confirmed the incorporation of cobalt ions into the ZnO structure up to 5 mol.% of Co. Simple annealing of Zn/Co-ZIF-8 materials in the air led to the formation of oxide nanoparticles of about 20–30 nm, while additional treatment of ZIFs with silicon source resulted in nanoparticles of about 5–10 nm covered with protective silica layer. We revealed the incorporation of oxygen vacancies in the obtained ZnO nanoparticles using FTIR analysis. All obtained samples were comprehensively characterized, including analysis with a synchrotron radiation source.
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Pustovarenko A, Dikhtiarenko A, Bavykina A, Gevers L, Ramírez A, Russkikh A, Telalovic S, Aguilar A, Hazemann JL, Ould-Chikh S, Gascon J. Metal–Organic Framework-Derived Synthesis of Cobalt Indium Catalysts for the Hydrogenation of CO2 to Methanol. ACS Catal 2020. [DOI: 10.1021/acscatal.0c00449] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Alexey Pustovarenko
- Advanced Catalytic Materials, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Alla Dikhtiarenko
- Advanced Catalytic Materials, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Anastasiya Bavykina
- Advanced Catalytic Materials, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Lieven Gevers
- Advanced Catalytic Materials, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Adrian Ramírez
- Advanced Catalytic Materials, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Artem Russkikh
- Advanced Catalytic Materials, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Selvedin Telalovic
- Advanced Catalytic Materials, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Antonio Aguilar
- Néel, UPR2940 CNRS, University of Grenoble Alpes, Grenoble F-38000, France
| | | | - Samy Ould-Chikh
- Advanced Catalytic Materials, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Jorge Gascon
- Advanced Catalytic Materials, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
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Pankin IA, Martini A, Lomachenko KA, Soldatov AV, Bordiga S, Borfecchia E. Identifying Cu-oxo species in Cu-zeolites by XAS: A theoretical survey by DFT-assisted XANES simulation and EXAFS wavelet transform. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.09.032] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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44
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Tatemizo N, Imada S, Okahara K, Nishikawa H, Tsuruta K, Ina T, Miura Y, Nishio K, Isshiki T. Electronic structure of AlFeN films exhibiting crystallographic orientation change from c- to a-axis with Fe concentrations and annealing effect. Sci Rep 2020; 10:1819. [PMID: 32020058 PMCID: PMC7000734 DOI: 10.1038/s41598-020-58835-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 01/22/2020] [Indexed: 11/11/2022] Open
Abstract
Wurtzite AlN film is a promising material for deep ultraviolet light-emitting diodes. However, some properties that attribute to its crystal orientation, i.e., c-axis orientation, are obstacles in realizing high efficiency devices. Constructing devices with non-c-axis oriented films is a solution to this problem; however, achieving it with conventional growth techniques is difficult. Recently, we succeeded in growing a-axis oriented wurtzite heavily Fe-doped AlN (AlFeN) films via sputtering. In this article, we report the electronic structures of AlFeN films investigated using soft X-ray spectroscopies. As-grown films were found to have conduction and valence band structures for a film with c-axis in film planes. Simultaneously, it was found that large gap states were formed via N-p and Fe-d hybridization. To remove the gap states, the films were annealed, thereby resulting in a drastic decrease of the gap states while maintaining a-axis orientation. We offer heavy Fe-doping and post annealing as a new technique to obtain non-polar AlN films.
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Affiliation(s)
- Nobuyuki Tatemizo
- Faculty of Electrical Engineering and Electronics, Kyoto Institute of Technology, Kyoto, Kyoto, 606-8585, Japan.
| | - Saki Imada
- Faculty of Electrical Engineering and Electronics, Kyoto Institute of Technology, Kyoto, Kyoto, 606-8585, Japan.
| | - Kizuna Okahara
- Faculty of Electrical Engineering and Electronics, Kyoto Institute of Technology, Kyoto, Kyoto, 606-8585, Japan
| | - Haruki Nishikawa
- Faculty of Electrical Engineering and Electronics, Kyoto Institute of Technology, Kyoto, Kyoto, 606-8585, Japan
| | - Kazuki Tsuruta
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo, 679-5198, Japan
| | - Toshiaki Ina
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo, 679-5198, Japan
| | - Yoshio Miura
- Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan
| | - Koji Nishio
- Faculty of Electrical Engineering and Electronics, Kyoto Institute of Technology, Kyoto, Kyoto, 606-8585, Japan
| | - Toshiyuki Isshiki
- Faculty of Electrical Engineering and Electronics, Kyoto Institute of Technology, Kyoto, Kyoto, 606-8585, Japan
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Usoltsev OA, Bugaev AL, Guda AA, Guda SA, Soldatov AV. Absorption of Hydrocarbons on Palladium Catalysts: From Simple Models Towards Machine Learning Analysis of X-ray Absorption Spectroscopy Data. Top Catal 2020. [DOI: 10.1007/s11244-020-01221-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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47
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Bugaev AL, Skorynina AA, Braglia L, Lomachenko KA, Guda A, Lazzarini A, Bordiga S, Olsbye U, Lillerud KP, Soldatov AV, Lamberti C. Evolution of Pt and Pd species in functionalized UiO-67 metal-organic frameworks. Catal Today 2019. [DOI: 10.1016/j.cattod.2019.03.054] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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48
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Guda AA, Guda SA, Lomachenko KA, Soldatov MA, Pankin IA, Soldatov AV, Braglia L, Bugaev AL, Martini A, Signorile M, Groppo E, Piovano A, Borfecchia E, Lamberti C. Quantitative structural determination of active sites from in situ and operando XANES spectra: From standard ab initio simulations to chemometric and machine learning approaches. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.10.071] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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49
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Andreeva AY, Pankin IA, Sukhikh TS, Kravtsova AN, Konchenko SN, Kozlova SG, Soldatov AV. Application of X-ray absorption spectroscopy for L3-edges of Dy and Yb in dibenzoylmethanide complexes: Experiment and theoretical interpretation. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.03.073] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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50
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Iridium Single-Atom Catalyst Performing a Quasi-homogeneous Hydrogenation Transformation of CO2 to Formate. Chem 2019. [DOI: 10.1016/j.chempr.2018.12.014] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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