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Lee Y, Yoon D, Nam YS, Yu S, Lim C, Sim H, Park Y, Han JW, Choi SY, Son J. Accelerating metal nanoparticle exsolution by exploiting tolerance factor of perovskite stannate. MATERIALS HORIZONS 2024; 11:3835-3843. [PMID: 38835315 DOI: 10.1039/d4mh00294f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
The octahedral symmetry in ionic crystals can play a critical role in atomic nucleation and migration during solid-solid phase transformation. Similarly, octahedron distortion, which is characterized by Goldschmidt tolerance factor, strongly influences the exsolution kinetics in the perovskite lattice framework during high-temperature annealing. However, a fundamental study on manipulating the exsolution process by octahedron distortion is still lacking. In this study, we accelerate Ni metal exsolution on the surface of perovskite stannates by increasing the [BO6] octahedron distortion in the lattices. Decreasing the A-site ionic radius (rBa2+ = 161 pm → rSr2+ = 144 pm → rCa2+ = 134 pm) increased the density of exsolved Ni nanoparticles by up to 640% (i.e., 47 particles μm-2 of Ba(Sn, Ni)O3 → 304 particles μm-2 of Ca(Sn, Ni)O3) after the identical exsolution process. Based on the theoretical calculation and experimental characterization, the decrease in crystal symmetry by octahedral distortion promoted the Ni exsolution owing to the boosted Ni migration by weakening the bond strength and generating domain boundaries. The findings highlight the importance of octahedral distortion to control atomic migration through the perovskite lattice framework and provide a strategy to tailor the density of uniformly populated nanoparticles in nanocomposite oxides for multifunctional material design.
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Affiliation(s)
- Yujeong Lee
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
- Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea.
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Daseob Yoon
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
| | - Yeon-Seo Nam
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
| | - Sangbae Yu
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
| | - Chaesung Lim
- Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea.
| | - Hyeji Sim
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
| | - Yunkyu Park
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
| | - Jeong Woo Han
- Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea.
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Si-Young Choi
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
| | - Junwoo Son
- Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea.
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
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2
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Summerer H, Rath K, Nenning A, Schachinger T, Stöger-Pollach M, Rameshan C, Opitz AK. Electro-tuned catalysts: voltage-controlled activity selection of bimetallic exsolution particles. JOURNAL OF MATERIALS CHEMISTRY. A 2024; 12:20386-20402. [PMID: 39114766 PMCID: PMC11304079 DOI: 10.1039/d4ta00989d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 07/02/2024] [Indexed: 08/10/2024]
Abstract
In this work, we show how the activity states of bimetallic Ni0-Fe0 catalysts exsolved from Nd0.6Ca0.4Fe0.97Ni0.03O3-δ (NCFNi) can be influenced electrochemically. The NCFNi parent oxide was employed in the form of thin film mixed conducting model electrodes, which were operated in a humid hydrogen atmosphere. By precisely controlling the oxygen chemical potential in the parent oxide electrode via applying an electrochemical polarisation, we managed to selectively exsolve Ni nanoparticles from the perovskite lattice and study their catalytic activity switching characteristics. To be able to track the surface chemical changes during the switching process, electrochemical polarisation experiments were combined with near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) measurements. This in situ analytical approach allowed relating the difference we observed in the switching behaviour of Ni particles here and of Fe particles in a recent study, to a different kinetic interplay between electrochemical driving force and atmosphere. We propose that slow oxygen transport through nickel oxide, located at the particle/perovskite interface, is mainly responsible for the observed difference to iron exsolutions, which becomes especially evident for larger nickel particles. In addition, in the case of bimetallic exsolutions and with applied bias voltage as a control parameter, we are able to reversibly switch between three different activity states, namely bimetallic Ni0-Fe0 (medium activity), pure Ni0 (high activity), and the inactive oxides.
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Affiliation(s)
- Harald Summerer
- Institute of Chemical Technologies and Analytics, TU Wien Getreidemarkt 9/164-EC 1060 Vienna Austria
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/165-PC 1060 Vienna Austria
| | - Kirsten Rath
- Institute of Chemical Technologies and Analytics, TU Wien Getreidemarkt 9/164-EC 1060 Vienna Austria
| | - Andreas Nenning
- Institute of Chemical Technologies and Analytics, TU Wien Getreidemarkt 9/164-EC 1060 Vienna Austria
| | - Thomas Schachinger
- Institute of Solid State Physics, TU Wien 1040 Vienna Austria
- University Service Centre for Transmission Electron Microscopy, TU Wien 1040 Vienna Austria
| | - Michael Stöger-Pollach
- Institute of Solid State Physics, TU Wien 1040 Vienna Austria
- University Service Centre for Transmission Electron Microscopy, TU Wien 1040 Vienna Austria
| | - Christoph Rameshan
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/165-PC 1060 Vienna Austria
- Chair of Physical Chemistry, Montanuniversity Leoben Leoben 8700 Austria
| | - Alexander K Opitz
- Institute of Chemical Technologies and Analytics, TU Wien Getreidemarkt 9/164-EC 1060 Vienna Austria
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Carrillo AJ, López-García A, Delgado-Galicia B, Serra JM. New trends in nanoparticle exsolution. Chem Commun (Camb) 2024; 60:7987-8007. [PMID: 38899785 DOI: 10.1039/d4cc01983k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2024]
Abstract
Many relevant high-temperature chemical processes require the use of oxide-supported metallic nanocatalysts. The harsh conditions under which these processes operate can trigger catalyst degradation via nanoparticle sintering, carbon depositions or poisoning, among others. This primarily affects metallic nanoparticles created via deposition methods with low metal-support interaction. In this respect, nanoparticle exsolution has emerged as a promising method for fabricating oxide-supported nanocatalysts with high interaction between the metal and the oxide support. This is due to the mechanism involved in nanoparticle exsolution, which is based on the migration of metal cations in the oxide support to its surface, where they nucleate and grow as metallic nanoparticles partially embedded in the oxide. This anchorage confers high robustness against sintering or coking-related problems. For these reasons, exsolution has attracted great interest in the last few years. Multiple works have been devoted to proving the high catalytic stability of exsolved metallic nanoparticles in several applications for high-temperature energy storage and conversion. Additionally, considerable attention has been directed towards understanding the underlying mechanism of metallic nanoparticle exsolution. However, this growing field has not been limited to these types of studies and recent discoveries at the forefront of materials design have opened new research avenues. In this work, we define six new trends in nanoparticle exsolution, taking a tour through the most important advances that have been recently reported.
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Affiliation(s)
- Alfonso J Carrillo
- Instituto de Tecnología Química, Universitat Politècnica de València, Consejo Superior de Investigaciones Científicas, 46022 Valencia, Spain.
| | - Andrés López-García
- Instituto de Tecnología Química, Universitat Politècnica de València, Consejo Superior de Investigaciones Científicas, 46022 Valencia, Spain.
| | - Blanca Delgado-Galicia
- Instituto de Tecnología Química, Universitat Politècnica de València, Consejo Superior de Investigaciones Científicas, 46022 Valencia, Spain.
| | - Jose M Serra
- Instituto de Tecnología Química, Universitat Politècnica de València, Consejo Superior de Investigaciones Científicas, 46022 Valencia, Spain.
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Kim MJ, Hassan MA, Lee C, Jung WG, Bae H, Jeon S, Jung W, Ha JS, Shim JH, Park JH, Ryu SW, Kim BJ. Maximizing Photoelectrochemical Performance in Metal-Oxide Hybrid Composites via Amorphous Exsolution-A New Exsolution Mechanism for Heterogeneous Catalysis. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308934. [PMID: 38161260 DOI: 10.1002/smll.202308934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/12/2023] [Indexed: 01/03/2024]
Abstract
Exsolution generates metal nanoparticles anchored within crystalline oxide supports, ensuring efficient exposure, uniform dispersion, and strong nanoparticle-perovskite interactions. Increased doping level in the perovskite is essential for further enhancing performance in renewable energy applications; however, this is constrained by limited surface exsolution, structural instability, and sluggish charge transfer. Here, hybrid composites are fabricated by vacuum-annealing a solution containing SrTiO3 photoanode and Co cocatalyst precursors for photoelectrochemical water-splitting. In situ transmission electron microscopy identifies uniform, high-density Co particles exsolving from amorphous SrTiO3 films, followed by film-crystallization at elevated temperatures. This unique process extracts entire Co dopants with complete structural stability, even at Co doping levels exceeding 30%, and upon air exposure, the Co particles embedded in the film oxidize to CoO, forming a Schottky junction at the interface. These conditions maximize photoelectrochemical activity and stability, surpassing those achieved by Co post-deposition and Co exsolution from crystalline oxides. Theoretical calculations demonstrate in the amorphous state, dopant─O bonds become weaker while Ti─O bonds remain strong, promoting selective exsolution. As expected from the calculations, nearly all of the 30% Fe dopants exsolve from SrTiO3 in an H2 environment, despite the strong Fe─O bond's low exsolution tendency. These analyses unravel the mechanisms driving the amorphous exsolution.
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Affiliation(s)
- Myeong-Jin Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Soth Korea
| | - Mostafa Afifi Hassan
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Soth Korea
- Department of Physics, Faculty of Science, New Valley University, El- Kharja, 72511, Egypt
| | - Changhoon Lee
- Max Planck POSTECH Center for Complex Phase of Materials, Pohang University of Science and Technology, Pohang, 37673, South Korea
- Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang, 37673, South Korea
| | - Wan-Gil Jung
- Korea Basic Science Institute, Gwangju, 61186, South Korea
| | - Hyojung Bae
- Korea Photonics Technology Institute (KOPTI), Cheomdanbencheo-ro 108 beon-gil 9, Buk-gu, Gwangju, 61007, South Korea
| | - SungHyun Jeon
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea
| | - WooChul Jung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea
| | - Jun-Seok Ha
- School of Chemical Engineering, Chonnam National University, Gwangju, 61186, South Korea
| | - Ji Hoon Shim
- Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang, 37673, South Korea
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, South Korea
| | - Jae-Hoon Park
- Max Planck POSTECH Center for Complex Phase of Materials, Pohang University of Science and Technology, Pohang, 37673, South Korea
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, South Korea
| | - Sang-Wan Ryu
- Department of Physics, Chonnam National University, Gwangju, 61186, South Korea
| | - Bong-Joong Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Soth Korea
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Weber ML, Šmíd B, Breuer U, Rose MA, Menzler NH, Dittmann R, Waser R, Guillon O, Gunkel F, Lenser C. Space charge governs the kinetics of metal exsolution. NATURE MATERIALS 2024; 23:406-413. [PMID: 38168807 PMCID: PMC10917682 DOI: 10.1038/s41563-023-01743-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 10/30/2023] [Indexed: 01/05/2024]
Abstract
Nanostructured composite electrode materials play a major role in the fields of catalysis and electrochemistry. The self-assembly of metallic nanoparticles on oxide supports via metal exsolution relies on the transport of reducible dopants towards the perovskite surface to provide accessible catalytic centres at the solid-gas interface. At surfaces and interfaces, however, strong electrostatic gradients and space charges typically control the properties of oxides. Here we reveal that the nature of the surface-dopant interaction is the main determining factor for the exsolution kinetics of nickel in SrTi0.9Nb0.05Ni0.05O3-δ. The electrostatic interaction of dopants with surface space charge regions forming upon thermal oxidation results in strong surface passivation, which manifests in a retarded exsolution response. We furthermore demonstrate the controllability of the exsolution response via engineering of the perovskite surface chemistry. Our findings indicate that tailoring the electrostatic gradients at the perovskite surface is an essential step to improve exsolution-type materials in catalytic converters.
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Affiliation(s)
- Moritz L Weber
- Peter Gruenberg Institute - Electronic Materials (PGI-7), Forschungszentrum Juelich GmbH, Juelich, Germany.
- Institute of Energy and Climate Research - Materials Synthesis and Processing (IEK-1), Forschungszentrum Juelich GmbH, Juelich, Germany.
- Juelich-Aachen Research Alliance (JARA-FIT), Juelich, Germany.
- Institute of Mineral Engineering (GHI), RWTH Aachen University, Aachen, Germany.
| | - Břetislav Šmíd
- Department of Surface and Plasma Science, Charles University, Prague, Czech Republic
| | - Uwe Breuer
- Central Institute for Engineering, Electronics and Analytics (ZEA-3), Forschungszentrum Juelich GmbH, Juelich, Germany
| | - Marc-André Rose
- Peter Gruenberg Institute - Electronic Materials (PGI-7), Forschungszentrum Juelich GmbH, Juelich, Germany
- Juelich-Aachen Research Alliance (JARA-FIT), Juelich, Germany
- Institute for Electronic Materials (IWE 2), RWTH Aachen University, Aachen, Germany
| | - Norbert H Menzler
- Institute of Energy and Climate Research - Materials Synthesis and Processing (IEK-1), Forschungszentrum Juelich GmbH, Juelich, Germany
- Institute of Mineral Engineering (GHI), RWTH Aachen University, Aachen, Germany
| | - Regina Dittmann
- Peter Gruenberg Institute - Electronic Materials (PGI-7), Forschungszentrum Juelich GmbH, Juelich, Germany
- Juelich-Aachen Research Alliance (JARA-FIT), Juelich, Germany
| | - Rainer Waser
- Peter Gruenberg Institute - Electronic Materials (PGI-7), Forschungszentrum Juelich GmbH, Juelich, Germany
- Juelich-Aachen Research Alliance (JARA-FIT), Juelich, Germany
- Institute for Electronic Materials (IWE 2), RWTH Aachen University, Aachen, Germany
| | - Olivier Guillon
- Institute of Energy and Climate Research - Materials Synthesis and Processing (IEK-1), Forschungszentrum Juelich GmbH, Juelich, Germany
- Institute of Mineral Engineering (GHI), RWTH Aachen University, Aachen, Germany
- Juelich-Aachen Research Alliance (JARA-Energy), Juelich, Germany
| | - Felix Gunkel
- Peter Gruenberg Institute - Electronic Materials (PGI-7), Forschungszentrum Juelich GmbH, Juelich, Germany.
- Juelich-Aachen Research Alliance (JARA-FIT), Juelich, Germany.
| | - Christian Lenser
- Institute of Energy and Climate Research - Materials Synthesis and Processing (IEK-1), Forschungszentrum Juelich GmbH, Juelich, Germany.
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Kim YH, Jeong H, Won BR, Jeon H, Park CH, Park D, Kim Y, Lee S, Myung JH. Nanoparticle Exsolution on Perovskite Oxides: Insights into Mechanism, Characteristics and Novel Strategies. NANO-MICRO LETTERS 2023; 16:33. [PMID: 38015283 PMCID: PMC10684483 DOI: 10.1007/s40820-023-01258-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 10/19/2023] [Indexed: 11/29/2023]
Abstract
Supported nanoparticles have attracted considerable attention as a promising catalyst for achieving unique properties in numerous applications, including fuel cells, chemical conversion, and batteries. Nanocatalysts demonstrate high activity by expanding the number of active sites, but they also intensify deactivation issues, such as agglomeration and poisoning, simultaneously. Exsolution for bottom-up synthesis of supported nanoparticles has emerged as a breakthrough technique to overcome limitations associated with conventional nanomaterials. Nanoparticles are uniformly exsolved from perovskite oxide supports and socketed into the oxide support by a one-step reduction process. Their uniformity and stability, resulting from the socketed structure, play a crucial role in the development of novel nanocatalysts. Recently, tremendous research efforts have been dedicated to further controlling exsolution particles. To effectively address exsolution at a more precise level, understanding the underlying mechanism is essential. This review presents a comprehensive overview of the exsolution mechanism, with a focus on its driving force, processes, properties, and synergetic strategies, as well as new pathways for optimizing nanocatalysts in diverse applications.
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Affiliation(s)
- Yo Han Kim
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Hyeongwon Jeong
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Bo-Ram Won
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Hyejin Jeon
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Chan-Ho Park
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Dayoung Park
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Yeeun Kim
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Somi Lee
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Jae-Ha Myung
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea.
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Wintzheimer S, Luthardt L, Cao KLA, Imaz I, Maspoch D, Ogi T, Bück A, Debecker DP, Faustini M, Mandel K. Multifunctional, Hybrid Materials Design via Spray-Drying: Much more than Just Drying. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2306648. [PMID: 37840431 DOI: 10.1002/adma.202306648] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/30/2023] [Indexed: 10/17/2023]
Abstract
Spray-drying is a popular and well-known "drying tool" for engineers. This perspective highlights that, beyond this application, spray-drying is a very interesting and powerful tool for materials chemists to enable the design of multifunctional and hybrid materials. Upon spray-drying, the confined space of a liquid droplet is narrowed down, and its ingredients are forced together upon "falling dry." As detailed in this article, this enables the following material formation strategies either individually or even in combination: nanoparticles and/or molecules can be assembled; precipitation reactions as well as chemical syntheses can be performed; and templated materials can be designed. Beyond this, fragile moieties can be processed, or "precursor materials" be prepared. Post-treatment of spray-dried objects eventually enables the next level in the design of complex materials. Using spray-drying to design (particulate) materials comes with many advantages-but also with many challenges-all of which are outlined here. It is believed that multifunctional, hybrid materials, made via spray-drying, enable very unique property combinations that are particularly highly promising in myriad applications-of which catalysis, diagnostics, purification, storage, and information are highlighted.
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Affiliation(s)
- Susanne Wintzheimer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany
- Fraunhofer-Institute for Silicate Research ISC, Neunerplatz 2, 97082, Würzburg, Germany
| | - Leoni Luthardt
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany
| | - Kiet Le Anh Cao
- Chemical Engineering Program, Department of Advanced Science and Engineering, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
| | - Inhar Imaz
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, and Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, Barcelona, 08193, Spain
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain
| | - Daniel Maspoch
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, and Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, Barcelona, 08193, Spain
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain
- ICREA, Pg. Lluís Companys 23, Barcelona, 08010, Spain
| | - Takashi Ogi
- Chemical Engineering Program, Department of Advanced Science and Engineering, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
| | - Andreas Bück
- Institute of Particle Technology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, 91058, Erlangen, Germany
| | - Damien P Debecker
- Université catholique de Louvain (UCLouvain), Institute of Condensed Matter and Nanosciences (IMCN), Place Louis Pasteur, 1, 348, Louvain-la-Neuve, Belgium
| | - Marco Faustini
- Sorbonne Université, Collège de France, CNRS, Laboratoire Chimie de la Matière Condensée de Paris (LCMCP), Paris, F-75005, France
- Institut Universitaire de France (IUF), Paris, 75231, France
| | - Karl Mandel
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany
- Fraunhofer-Institute for Silicate Research ISC, Neunerplatz 2, 97082, Würzburg, Germany
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Lu Y, Huang Y, Xu Z, Yang K, Bao W, Lu Q. Quantifying Electrochemical Driving Force for Exsolution in Perovskite Oxides by Designing Graded Oxygen Chemical Potential. ACS NANO 2023. [PMID: 37390393 DOI: 10.1021/acsnano.3c04008] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/02/2023]
Abstract
Metal nanoparticles exsolved and anchored at the parent perovskite oxide surfaces can greatly enhance the activity and antisintering stability for high-temperature (electro-) chemical catalytic reactions. While exsolution of nanoparticles triggered by using conventional high-temperature thermal reduction suffers from slow kinetics, using an electrochemical driving force can promote the exsolution rate. However, a quantitative correlation between the applied electrochemical driving force and the spatial density of exsolved nanoparticles remains unknown. In this work, we use a specially designed electrochemical device to induce a spatially graded voltage in a La0.43Ca0.37Ti0.94Ni0.06O3-δ electrode, in order to systematically investigate the effect of electrochemical switching on exsolution. With increasing driving force, which leads to decreasing oxygen chemical potential, the density of nanoparticles was observed to increase dramatically, while the average particle size remained roughly constant. We further identified oxygen vacancy pairs or clusters as the preferential nucleation sites for exsolution. Our work provided a high-throughput platform for the systematic study of exsolution of perovskite oxides targeted for fuel electrode materials with improved electrocatalytic performance and stability.
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Affiliation(s)
- Ying Lu
- Research Center for Industries of the Future, Westlake University, Hangzhou, Zhejiang 310030, China
- School of Engineering, Westlake University, Hangzhou, Zhejiang 310024, China
| | - Yiwei Huang
- School of Engineering, Westlake University, Hangzhou, Zhejiang 310024, China
| | - Zihan Xu
- School of Engineering, Westlake University, Hangzhou, Zhejiang 310024, China
| | - Kaichuang Yang
- School of Engineering, Westlake University, Hangzhou, Zhejiang 310024, China
| | - Weichao Bao
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
| | - Qiyang Lu
- Research Center for Industries of the Future, Westlake University, Hangzhou, Zhejiang 310030, China
- School of Engineering, Westlake University, Hangzhou, Zhejiang 310024, China
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9
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Summerer H, Nenning A, Rameshan C, Opitz AK. Exsolved catalyst particles as a plaything of atmosphere and electrochemistry. EES CATALYSIS 2023; 1:274-289. [PMID: 37213935 PMCID: PMC10193834 DOI: 10.1039/d2ey00036a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 03/20/2023] [Indexed: 05/23/2023]
Abstract
A new type of catalyst preparation yields its active sites not by infiltration but exsolution of reducible transition metals of its own host lattice. These exsolution catalysts offer a high dispersion of catalytically active particles, slow agglomeration, and the possibility of reactivation after poisoning due to redox cycling. The formation of exsolved particles by partial decomposition of the host lattice can be driven by applying a sufficiently reducing atmosphere, elevated temperatures but also by a cathodic bias voltage (provided the host perovskite is an electrode on an oxide ion conducting electrolyte). In addition, such an electrochemical polarisation can change the oxidation state and thus the catalytic activity of exsolved particles. In this work, we investigate the electrochemical switching between an active and an inactive state of iron particles exsolved from thin film mixed conducting model electrodes, namely La0.6Sr0.4FeO3-δ (LSF) and Nd0.6Ca0.4FeO3-δ (NCF), in humid hydrogen atmospheres. We show that the transition between two activity states exhibits a hysteresis-like behaviour in the electrochemical I-V characteristics. Ambient pressure XPS measurements proofed that this hysteresis is linked to the oxidation and reduction of iron particles. Furthermore, it is demonstrated that the surface kinetics of the host material itself has only a negligible impact on the particle exsolution, and that the main impact factors are the surrounding atmosphere as well as the applied electrochemical overpotential. In particular, we suggest a 'kinetic competition' between gas atmosphere and oxygen chemical potential in the mixed conducting electrode and discuss possible ways of how this process takes place.
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Affiliation(s)
- Harald Summerer
- TU Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC 1060 Vienna Austria
- TU Wien, Institute of Materials Chemistry, Getreidemarkt 9/165-PC 1060 Vienna Austria
| | - Andreas Nenning
- TU Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC 1060 Vienna Austria
| | - Christoph Rameshan
- TU Wien, Institute of Materials Chemistry, Getreidemarkt 9/165-PC 1060 Vienna Austria
| | - Alexander K Opitz
- TU Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC 1060 Vienna Austria
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10
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Ma X, Huang J, Ma L, Jing D. Bandgap and defects regulation of La2−xAxNi1−yByO4+δ (A = K, Sr, B = Co, Mn) Ruddlesden-Popper type perovskites for efficient photocatalytic hydrogen evolution. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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11
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Ruh T, Berkovec D, Schrenk F, Rameshan C. Exsolution on perovskite oxides: morphology and anchorage of nanoparticles. Chem Commun (Camb) 2023; 59:3948-3956. [PMID: 36916176 PMCID: PMC10065136 DOI: 10.1039/d3cc00456b] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Abstract
Perovskites are very promising materials for a wide range of applications (such as catalysis, solid oxide fuel cells…) due to beneficial general properties (e.g. stability at high temperatures) and tunability - doping both A- and B-site cations opens the path to a materials design approach that allows specific properties to be finely tuned towards applications. A major asset of perovskites is the ability to form nanoparticles on the surface under certain conditions in a process called "exsolution". Exsolution leads to the decoration of the material's surface with finely dispersed nanoparticles (which can be metallic or oxidic - depending on the experimental conditions) made from B-site cations of the perovskite lattice (here, doping comes into play, as B-site doping allows control over the constitution of the nanoparticles). In fact, the ability to undergo exsolution is one of the main reasons that perovskites are currently a hot topic of intensive research in catalysis and related fields. Exsolution on perovskites has been heavily researched in the last couple of years: various potential catalysts have been tested with different reactions, the oxide backbone materials and the exsolved nanoparticles have been investigated with a multitude of different methods, and the effect of different exsolution parameters on the resulting nanoparticles has been studied. Despite all this, to our knowledge no comprehensive effort was made so far to evaluate these studies with respect to the effect that the exsolution conditions have on anchorage and morphology of the nanoparticles. Therefore, this highlight aims to provide an overview of nanoparticles exsolved from oxide-based perovskites with a focus on the conditions leading to nanoparticle exsolution.
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Affiliation(s)
- Thomas Ruh
- Chair of Physical Chemistry, Montanuniversity Leoben, 8700 Leoben, Austria. .,Institute of Materials Chemistry, TU Wien, 1060 Vienna, Austria
| | | | - Florian Schrenk
- Chair of Physical Chemistry, Montanuniversity Leoben, 8700 Leoben, Austria.
| | - Christoph Rameshan
- Chair of Physical Chemistry, Montanuniversity Leoben, 8700 Leoben, Austria. .,Institute of Materials Chemistry, TU Wien, 1060 Vienna, Austria
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12
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Wang X, Zhang Y, Zhang C, Wei H, Jin H, Mu Z, Chen X, Chen X, Wang P, Guo X, Ding F, Liu X, Ma L. Artificial intelligence-aided preparation of perovskite SrFe xZr 1-xO 3-δ catalysts for ozonation degradation of organic pollutant concentrated water after membrane treatment. CHEMOSPHERE 2023; 318:137825. [PMID: 36681194 DOI: 10.1016/j.chemosphere.2023.137825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 12/20/2022] [Accepted: 01/10/2023] [Indexed: 06/17/2023]
Abstract
Membrane technology has been widely used to treat wastewater from a variety of industries, but it also results in a large amount of concentrated wastewater containing organic pollutants after membrane treatment, which is challenging to decompose. Here in this work, a series of perovskite SrFexZr1-xO3-δ catalysts were prepared via a modified co-precipitation method and evaluated for catalytic ozone oxidative degradation of m-cresol. An artificial neural intelligence networks (ANN) model was employed to train the experimental data to optimize the preparation parameters of catalysts, with SrFe0.13Zr0.87O3-δ being the optimal catalysts. The resultant catalysts before and after reduction were then thoroughly characterized and tested for m-cresol degradation. It was found that the co-doping of Fe and Zr at the B-site and the improvement of oxygen vacancies and oxygen active species by reduction dramatically increased TOC removal rates up to 5 times compared with ozone alone, with the conversion rate of m-cresol reaching 100%. We also proposed a possible mechanism for m-cresol degradation via investigating the intermediates using GC-MS, and confirmed the good versatility of the reduced SrFe0.13Zr0.87O3-δ catalyst to remove other common organic pollutants in concentrated wastewater. This work demonstrates new prospects for the use of perovskite materials in wastewater treatment.
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Affiliation(s)
- Xu Wang
- Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology/College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, Beijing, PR China
| | - Yanan Zhang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
| | - Cheng Zhang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
| | - Huangzhao Wei
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
| | - Haibo Jin
- Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology/College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, Beijing, PR China
| | - Zhao Mu
- Institute of Applied Chemical Technology for Oilfield/ College of New Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, Beijing, PR China
| | - Xiaofei Chen
- Chen Ping Laboratory of TIANS Engineering Technology Group Co. Ltd., Shijiazhuang 050000, Hebei, PR China
| | - Xinru Chen
- Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology/College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, Beijing, PR China
| | - Ping Wang
- Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology/College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, Beijing, PR China
| | - Xiaoyan Guo
- Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology/College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, Beijing, PR China
| | - Fuchen Ding
- Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology/College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, Beijing, PR China.
| | - Xiaowei Liu
- Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
| | - Lei Ma
- Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology/College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, Beijing, PR China.
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13
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Wang J, Kalaev D, Yang J, Waluyo I, Hunt A, Sadowski JT, Tuller HL, Yildiz B. Fast Surface Oxygen Release Kinetics Accelerate Nanoparticle Exsolution in Perovskite Oxides. J Am Chem Soc 2023; 145:1714-1727. [PMID: 36627834 DOI: 10.1021/jacs.2c10256] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Exsolution is a recent advancement for fabricating oxide-supported metal nanoparticle catalysts via phase precipitation out of a host oxide. A fundamental understanding and control of the exsolution kinetics are needed to engineer exsolved nanoparticles to obtain higher catalytic activity toward clean energy and fuel conversion. Since oxygen release via oxygen vacancy formation in the host oxide is behind oxide reduction and metal exsolution, we hypothesize that the kinetics of metal exsolution should depend on the kinetics of oxygen release, in addition to the kinetics of metal cation diffusion. Here, we probe the surface exsolution kinetics both experimentally and theoretically using thin-film perovskite SrTi0.65Fe0.35O3 (STF) as a model system. We quantitatively demonstrated that in this system the surface oxygen release governs the metal nanoparticle exsolution kinetics. As a result, by increasing the oxygen release rate in STF, either by reducing the sample thickness or by increasing the surface reactivity, one can effectively accelerate the Fe0 exsolution kinetics. Fast oxygen release kinetics in STF not only shortened the prereduction time prior to the exsolution onset, but also increased the total quantity of exsolved Fe0 over time, which agrees well with the predictions from our analytical kinetic modeling. The consistency between the results obtained from in situ experiments and analytical modeling provides a predictive capability for tailoring exsolution, and highlights the importance of engineering host oxide surface oxygen release kinetics in designing exsolved nanocatalysts.
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Affiliation(s)
- Jiayue Wang
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Dmitri Kalaev
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Jing Yang
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Iradwikanari Waluyo
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York11973, United States
| | - Adrian Hunt
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York11973, United States
| | - Jerzy T Sadowski
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York11973, United States
| | - Harry L Tuller
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Bilge Yildiz
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States.,Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
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14
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Xu M, Liu C, Naden AB, Früchtl H, Bühl M, Irvine JTS. Electrochemical Activation Applied to Perovskite Titanate Fibers to Yield Supported Alloy Nanoparticles for Electrocatalytic Application. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2204682. [PMID: 36372544 DOI: 10.1002/smll.202204682] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 10/07/2022] [Indexed: 06/16/2023]
Abstract
Active bi-metallic nanoparticles are of key importance in catalysis and renewable energy. Here, the in situ formation of bi-metallic nanoparticles is investigated by exsolution on 200 nm diameter perovskite fibers. The B-site co-doped perovskite fibers display a high degree of exsolution, decorated with NiCo or Ni3 Fe bi-metallic nanoparticles with average diameter about 29 and 35 nm, respectively. The perovskite fibers are utilized as cathode materials in pure CO2 electrolysis cells due to their redox stability in the CO/CO2 atmosphere. After in situ electrochemical switching, the nanoparticles exsolved from the perovskite fiber demonstrate an enhanced performance in pure CO2 electrolysis. At 900 °C, the current density of solid oxide electrolysis cell (SOEC) with 200 µm YSZ electrolyte supported NiFe doped perovskite fiber anode reaches 0.75 Acm-2 at 1.6 V superior to the NiCo doped perovskite fiber anode (about 1.5 times) in pure CO2 . According to DFT calculations (PBE-D3 level) the superior CO2 conversion on NiFe compared to NiCo bi-metallic species is related to an enhanced driving force for C-O cleavage under formation of CO chemisorbed on the nanoparticle and a reduced binding energy of CO required to release this product.
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Affiliation(s)
- Min Xu
- School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK
| | - Chencheng Liu
- School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK
| | - Aaron B Naden
- School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK
| | - Herbert Früchtl
- School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK
| | - Michael Bühl
- School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK
| | - John T S Irvine
- School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK
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15
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Zhang Y, Arpino KE, Yang Q, Kikugawa N, Sokolov DA, Hicks CW, Liu J, Felser C, Li G. Observation of a robust and active catalyst for hydrogen evolution under high current densities. Nat Commun 2022; 13:7784. [PMID: 36526636 PMCID: PMC9758214 DOI: 10.1038/s41467-022-35464-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Accepted: 12/05/2022] [Indexed: 12/23/2022] Open
Abstract
Despite the fruitful achievements in the development of hydrogen production catalysts with record-breaking performances, there is still a lack of durable catalysts that could work under large current densities (>1000 mA cm-2). Here, we investigated the catalytic behaviors of Sr2RuO4 bulk single crystals. This crystal has demonstrated remarkable activities under the current density of 1000 mA cm-2, which require overpotentials of 182 and 278 mV in 0.5 M H2SO4 and 1 M KOH electrolytes, respectively. These materials are stable for 56 days of continuous testing at a high current density of above 1000 mA cm-2 and then under operating temperatures of 70 °C. The in-situ formation of ferromagnetic Ru clusters at the crystal surface is observed, endowing the single-crystal catalyst with low charge transfer resistance and high wettability for rapid gas bubble removal. These experiments exemplify the potential of designing HER catalysts that work under industrial-scale current density.
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Affiliation(s)
- Yudi Zhang
- CAS Key Laboratory of Magnetic Materials and Devices, and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- University of Chinese Academy of Sciences, 19A Yuquan Rd, Shijingshan District, Beijing, 100049, China
| | - Kathryn E Arpino
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187, Dresden, Germany
| | - Qun Yang
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187, Dresden, Germany
| | - Naoki Kikugawa
- National Institute for Materials Science (NIMS), Tsukuba, 305-0003, Japan
| | - Dmitry A Sokolov
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187, Dresden, Germany
| | - Clifford W Hicks
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187, Dresden, Germany
| | - Jian Liu
- University of Chinese Academy of Sciences, 19A Yuquan Rd, Shijingshan District, Beijing, 100049, China.
- Center for Advanced Solidification Technology, School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China.
| | - Claudia Felser
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187, Dresden, Germany.
| | - Guowei Li
- CAS Key Laboratory of Magnetic Materials and Devices, and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
- University of Chinese Academy of Sciences, 19A Yuquan Rd, Shijingshan District, Beijing, 100049, China.
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16
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Shin E, Kim DH, Cha JH, Yun S, Shin H, Ahn J, Jang JS, Baek JW, Park C, Ko J, Park S, Choi SY, Kim ID. Ultrafast Ambient-Air Exsolution on Metal Oxide via Momentary Photothermal Effect. ACS NANO 2022; 16:18133-18142. [PMID: 36108309 DOI: 10.1021/acsnano.2c05128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The process of exsolution for the synthesis of strongly anchored metal nanoparticles (NPs) on host oxide lattices has been proposed as a promising strategy for designing robust catalyst-support composite systems. However, because conventional exsolution processes occur in harsh reducing environments at high temperatures for long periods of time, the choice of support materials and dopant metals are limited to those with inherently high thermal and chemical stability. Herein, we report the exsolution of a series of noble metal catalysts (Pt, Rh, and Ir) from metal oxide nanofibers (WO3 NFs) supports in an entirely ambient environment induced by intense pulsed light (IPL)-derived momentary photothermal treatment (>1000 °C). Since the exsolution process spans an extremely short period of time (<20 ms), unwanted structural artifacts such as decreased surface area and phase transition of the support materials are effectively suppressed. At the same time, exsolved NPs (<5 nm) with uniform size distributions could successfully be formed. To prove the practical utility of exsolved catalytic NPs functionalized on WO3 NFs, the chemiresistive gas sensing characteristics of exsolved Pt-decorated WO3 NFs were analyzed, exhibiting high durability (>200 cyclic exposures), enhanced response (Rair/Rgas > 800 @ 1 ppm/350 °C), and selectivity toward H2S target gas. Altogether, we successfully demonstrated that ultrafast exsolution within a few milliseconds could be induced in ambient conditions using the IPL-derived momentary photothermal treatment and contributed to expanding the practical viability of the exsolution-based synthetic approaches for the production of highly stable catalyst systems.
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Affiliation(s)
- Euichul Shin
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Membrane Innovation Center for Anti-Virus and Air-Quality Control, KAIST Institute for Nanocentury, 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
| | - Dong-Ha Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Membrane Innovation Center for Anti-Virus and Air-Quality Control, KAIST Institute for Nanocentury, 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts02139, United States
| | - Jun-Hwe Cha
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Center for Advanced Materials Discovery towards 3D Displays, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
| | - Seolwon Yun
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Center for Advanced Materials Discovery towards 3D Displays, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
| | - Hamin Shin
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Membrane Innovation Center for Anti-Virus and Air-Quality Control, KAIST Institute for Nanocentury, 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
| | - Jaewan Ahn
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Membrane Innovation Center for Anti-Virus and Air-Quality Control, KAIST Institute for Nanocentury, 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
| | - Ji-Soo Jang
- Electronic Materials Center, Korea Institute of Science and Technology, Seoul02792, Republic of Korea
| | - Jong Won Baek
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Membrane Innovation Center for Anti-Virus and Air-Quality Control, KAIST Institute for Nanocentury, 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
| | - Chungseong Park
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Membrane Innovation Center for Anti-Virus and Air-Quality Control, KAIST Institute for Nanocentury, 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
| | - Jaehyun Ko
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Membrane Innovation Center for Anti-Virus and Air-Quality Control, KAIST Institute for Nanocentury, 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
| | - Seyeon Park
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Membrane Innovation Center for Anti-Virus and Air-Quality Control, KAIST Institute for Nanocentury, 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
| | - Sung-Yool Choi
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Center for Advanced Materials Discovery towards 3D Displays, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
| | - Il-Doo Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
- Membrane Innovation Center for Anti-Virus and Air-Quality Control, KAIST Institute for Nanocentury, 291 Daehak-ro, Yuseong-gu, Daejeon34141, Republic of Korea
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17
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Li Z, Wang X, Li X, Zeng M, Redshaw C, Cao R, Sarangi R, Hou C, Chen Z, Zhang W, Wang N, Wu X, Zhu Y, Wu YA. Engineering surface segregation of perovskite oxide through wet exsolution for CO catalytic oxidation. JOURNAL OF HAZARDOUS MATERIALS 2022; 436:129110. [PMID: 35739693 DOI: 10.1016/j.jhazmat.2022.129110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 04/22/2022] [Accepted: 05/06/2022] [Indexed: 06/15/2023]
Abstract
Cation segregation occurring near the surface or interfaces of solid catalysts plays an important role in catalytic reactions. Unfortunately, the native surface of perovskite oxides is dominated by passivated A-site segregation, which severely hampers the catalytic activity and durability of the system. To address this issue, herein, we present a wet exsolution method to reconstruct surface segregation in perovskite cobalt oxide. Under reduction etching treatment of glycol solution, inert surface Sr segregation was transformed into active Co3O4 segregation. By varying the reaction time, we achieved differing coverage of the active Co3O4 segregation on the La0.5Sr0.5CoO3-δ (LSCO) perovskite oxide surface. This study reveals that CO oxidation activity exhibits a volcano-shaped dependence on the coverage of Co3O4 segregation at the surface of a perovskite cobalt oxide. Furthermore, we find that a suitable coverage of Co3O4 segregation can dramatically improve the catalytic activity of the perovskite catalyst by enhancing interface interactions. Co K-edge, Co L-edge, and O K-edge X-ray absorption spectra confirm that the synergistic effect optimizes the covalence of the metal-oxygen bond at the surface and interface. This work not only contributes to the design and development of perovskite-type catalysts, but also provides important insight into the relationship between surface segregation and catalytic activity.
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Affiliation(s)
- Zhen Li
- Guangxi Institute Fullerene Technology (GIFT), State Key Laboratory of Featured Metal Resources and Advanced Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; Department of Mechanical and Mechatronics Engineering, Waterloo Institute for Nanotechnology, Materials Interface Foundry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Xiyang Wang
- Department of Mechanical and Mechatronics Engineering, Waterloo Institute for Nanotechnology, Materials Interface Foundry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Xinbo Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, Jilin University, Changchun 130012, China
| | - Minli Zeng
- Guangxi Institute Fullerene Technology (GIFT), State Key Laboratory of Featured Metal Resources and Advanced Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Carl Redshaw
- Plastics Collaboratory, Department of Chemistry, University of Hull, Hull HU6 7RX, UK
| | - Rui Cao
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Ritimukta Sarangi
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Changmin Hou
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, Jilin University, Changchun 130012, China
| | - Zuolong Chen
- Department of Mechanical and Mechatronics Engineering, Waterloo Institute for Nanotechnology, Materials Interface Foundry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Wenhua Zhang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, Anhui, China
| | - Nannan Wang
- Guangxi Institute Fullerene Technology (GIFT), State Key Laboratory of Featured Metal Resources and Advanced Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.
| | - Xiaofeng Wu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, Jilin University, Changchun 130012, China.
| | - Yanqiu Zhu
- Guangxi Institute Fullerene Technology (GIFT), State Key Laboratory of Featured Metal Resources and Advanced Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Yimin A Wu
- Department of Mechanical and Mechatronics Engineering, Waterloo Institute for Nanotechnology, Materials Interface Foundry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
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18
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Boosting the stability of perovskites with exsolved nanoparticles by B-site supplement mechanism. Nat Commun 2022; 13:4618. [PMID: 35941119 PMCID: PMC9359987 DOI: 10.1038/s41467-022-32393-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 07/29/2022] [Indexed: 11/08/2022] Open
Abstract
Perovskites with exsolved nanoparticles (P-eNs) have immense potentials for carbon dioxide (CO2) reduction in solid oxide electrolysis cell. Despite the recent achievements in promoting the B-site cation exsolution for enhanced catalytic activities, the unsatisfactory stability of P-eNs at high voltages greatly impedes their practical applications and this issue has not been elucidated. In this study, we reveal that the formation of B-site vacancies in perovskite scaffold is the major contributor to the degradation of P-eNs; we then address this issue by fine-regulating the B-site supplement of the reduced Sr2Fe1.3Ni0.2Mo0.5O6-δ using foreign Fe sources, achieving a robust perovskite scaffold and prolonged stability performance. Furthermore, the degradation mechanism from the perspective of structure stability of perovskite has also been proposed to understand the origins of performance deterioration. The B-site supplement endows P-eNs with the capability to become appealing electrocatalysts for CO2 reduction and more broadly, for other energy storage and conversion systems.
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19
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Lv H, Lin L, Zhang X, Song Y, Li R, Li J, Matsumoto H, Ta N, Zeng C, Gong H, Fu Q, Wang G, Bao X. Redox-manipulated RhO nanoclusters uniformly anchored on Sr2Fe1.45Rh0.05Mo0.5O6–δ perovskite for CO2 electrolysis. FUNDAMENTAL RESEARCH 2022. [DOI: 10.1016/j.fmre.2022.07.010] [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] Open
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20
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Zhang Z, Yi J, Han H, Meng Y, Zhang H, Jiang Y. Electrochemical Response of Mixed Conducting Perovskite Enables Low-Cost High-Efficiency Hydrogen Sensing. ACS APPLIED MATERIALS & INTERFACES 2022; 14:33580-33588. [PMID: 35849478 DOI: 10.1021/acsami.2c09642] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
High-performance noble metal-free gas sensors are crucial for widespread applications in various areas. Non-Nernstian electrochemical sensors have attracted tremendous attention, but are limited by the high cost and low efficiency of Pt electrode. Moreover, responses from different electrodes usually have the same polarity, degrading the sensor performance. Here we report a reverse response on a series of mixed ionic-electronic conductors (MIECs). Exemplary SrFe0.5Ti0.5O3-δ (SFT50) perovskite shows excellent H2 sensing properties, including high sensitivity and selectivity, humidity resistance, and long-term stability. Strikingly, the response is positive, as opposed to the usual one. Such an unusual response is ascribed to the change of the surface electrostatic potential due to the gas chemical reaction, which outcompetes traditional mechanisms, thereby reversing the response polarity. A conceptual noble-metal-free sensor with dual oxide electrodes of opposite polarity is designed by substituting SFT50 for the benchmark Pt, achieving a 1.5-2.0× increase in H2 response, sensitivity, and selectivity and a low limit of detection of 16 ppb. The ideal unity of excellent sensing and unusual polarity for MIECs can be used to optimize the performance of a variety of conventional sensors while reducing the cost. Our findings provide new insights into electrochemical gas sensing and offer a facile approach for developing low-cost high-performance gas sensors.
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Affiliation(s)
- Zuobin Zhang
- State Key Laboratory of Fire Science, Department of Safety Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Jianxin Yi
- State Key Laboratory of Fire Science, Department of Safety Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Hongjie Han
- State Key Laboratory of Fire Science, Department of Safety Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Yuqing Meng
- Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
| | - He Zhang
- State Key Laboratory of Fire Science, Department of Safety Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Yong Jiang
- State Key Laboratory of Fire Science, Department of Safety Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
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21
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Wang J, Kumar A, Wardini JL, Zhang Z, Zhou H, Crumlin EJ, Sadowski JT, Woller KB, Bowman WJ, LeBeau JM, Yildiz B. Exsolution-Driven Surface Transformation in the Host Oxide. NANO LETTERS 2022; 22:5401-5408. [PMID: 35771744 DOI: 10.1021/acs.nanolett.2c01439] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Exsolution synthesizes self-assembled metal nanoparticle catalysts via phase precipitation. An overlooked aspect in this method thus far is how exsolution affects the host oxide surface chemistry and structure. Such information is critical as the oxide itself can also contribute to the overall catalytic activity. Combining X-ray and electron probes, we investigated the surface transformation of thin-film SrTi0.65Fe0.35O3 during Fe0 exsolution. We found that exsolution generates a highly Fe-deficient near-surface layer of about 2 nm thick. Moreover, the originally single-crystalline oxide near-surface region became partially polycrystalline after exsolution. Such drastic transformations at the surface of the oxide are important because the exsolution-induced nonstoichiometry and grain boundaries can alter the oxide ion transport and oxygen exchange kinetics and, hence, the catalytic activity toward water splitting or hydrogen oxidation reactions. These findings highlight the need to consider the exsolved oxide surface, in addition to the metal nanoparticles, in designing the exsolved nanocatalysts.
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Affiliation(s)
- Jiayue Wang
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Abinash Kumar
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Jenna L Wardini
- Department of Materials Science & Engineering, University of California, Irvine, California 92697, United States
| | - Zhan Zhang
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Hua Zhou
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Ethan J Crumlin
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jerzy T Sadowski
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Kevin B Woller
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - William J Bowman
- Department of Materials Science & Engineering, University of California, Irvine, California 92697, United States
| | - James M LeBeau
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Bilge Yildiz
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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22
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Sun Z, Fan W, Bai Y. A Flexible Method to Fabricate Exsolution-Based Nanoparticle-Decorated Materials in Seconds. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2200250. [PMID: 35187861 PMCID: PMC9036016 DOI: 10.1002/advs.202200250] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/07/2022] [Indexed: 06/14/2023]
Abstract
Decorating metallic nanoparticles on the surface of oxide support is a promising approach to tailor the catalytic activity of perovskite. Here, for the first time using thermal shock to rapidly fabricate nanoparticle-decorated materials (NDMs) is proposed. Low-cost and size-tailorable carbon paper is used as the heating source during the thermal shock. It is reported that by thermal shock technique, only ≈13 s including heating and treating time is needed to fabricate the exsolution-based NDMs (the fastest method to date). Benefitted by the sufficiently provided driving force and the short treating time, as compared to the product prepared by the conventionally furnace-based method, higher particle density and smaller particle size of the exsolved catalysts are acquired for the thermal shock fabricated NDM, giving rise to a fascinating improvement (12-fold) of the electrochemical performance. This work develops a new technique to rapidly fabricate NDMs in an economic and high-throughput manner, profoundly improving the flexibility of the application of exsolution-based materials in electrochemical devices.
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Affiliation(s)
- Zhu Sun
- State Key Laboratory of Electrical Insulation and Power EquipmentXi'an Jiaotong UniversityXi'an710049P. R. China
| | - Weiwei Fan
- Department of Nuclear Science and EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
| | - Yu Bai
- State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an710049P. R. China
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23
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Fan W, Sun Z, Bai Y. Manipulating Electrocatalytic Activity of Perovskite Oxide Through Electrochemical Treatment. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2107131. [PMID: 35064625 DOI: 10.1002/smll.202107131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 12/12/2021] [Indexed: 06/14/2023]
Abstract
Perovskite oxides are widely used in electrochemical cells, profiting from their excellent accommodation of different elements and structure stability. Here, it is reported that when rapidly exceeding the electrochemical stability window of a perovskite oxide through electrochemical treatment, nanoparticles can dynamically exsolve from the perovskite lattice, yielding a nanoparticle decorated material (NDM) with fascinating particle population and distribution. It is reported that as compared to the NDM produced by chemical gas reduction, electrochemical treatment fabricated NDM shows much better electrochemical performance. At 900 °C, a peak power density (PPD) of 896 mW cm-2 (more than tenfold enhancement) is obtained for a yttrium stabilized zirconia (YSZ) electrolyte-supported symmetrical cell with La0.43 Ca0.37 Ti0.8 Co0.1 Fe0.1 O3- δ (LCTCF) electrode after electrochemical treatment for several minutes, while it only reaches to 210 mW cm-2 after chemical gas treatment for tens of hours using humidified hydrogen as fuel. The study establishes a new fairyland for tuning the performance of-but not limited to-the electrochemical cells.
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Affiliation(s)
- Weiwei Fan
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Zhu Sun
- State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Yu Bai
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
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Thyssen VV, Vilela VB, de Florio DZ, Ferlauto AS, Fonseca FC. Direct Conversion of Methane to C 2 Hydrocarbons in Solid-State Membrane Reactors at High Temperatures. Chem Rev 2021; 122:3966-3995. [PMID: 34962796 DOI: 10.1021/acs.chemrev.1c00447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Direct conversion of methane to C2 compounds by oxidative and nonoxidative coupling reactions has been intensively studied in the past four decades; however, because these reactions have intrinsic severe thermodynamic constraints, they have not become viable industrially. Recently, with the increasing availability of inexpensive "green electrons" coming from renewable sources, electrochemical technologies are gaining momentum for reactions that have been challenging for more conventional catalysis. Using solid-state membranes to control the reacting species and separate products in a single step is a crucial advantage. Devices using ionic or mixed ionic-electronic conductors can be explored for methane coupling reactions with great potential to increase selectivity. Although these technologies are still in the early scaling stages, they offer a sustainable path for the utilization of methane and benefit from the advances in both solid oxide fuel cells and electrolyzers. This review identifies promising developments for solid-state methane conversion reactors by assessing multifunctional layers with microstructural control; combining solid electrolytes (proton and oxygen ion conductors) with active and selective electrodes/catalysts; applying more efficient reactor designs; understanding the reaction/degradation mechanisms; defining standards for performance evaluation; and carrying techno-economic analysis.
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Affiliation(s)
- Vivian Vazquez Thyssen
- Nuclear and Energy Research Institute (IPEN-CNEN), Av. Lineu Prestes, 2242, 05508-000 São Paulo, SP, Brazil
| | - Vanessa Bezerra Vilela
- Nuclear and Energy Research Institute (IPEN-CNEN), Av. Lineu Prestes, 2242, 05508-000 São Paulo, SP, Brazil
| | - Daniel Zanetti de Florio
- Center for Engineering, Modeling and Applied Social Sciences, Federal University of ABC (UFABC), Av. dos Estados, 5001, 09210-580 Santo André, SP, Brazil
| | - Andre Santarosa Ferlauto
- Center for Engineering, Modeling and Applied Social Sciences, Federal University of ABC (UFABC), Av. dos Estados, 5001, 09210-580 Santo André, SP, Brazil
| | - Fabio Coral Fonseca
- Nuclear and Energy Research Institute (IPEN-CNEN), Av. Lineu Prestes, 2242, 05508-000 São Paulo, SP, Brazil
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25
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Kim H, Lim C, Kwon O, Oh J, Curnan MT, Jeong HY, Choi S, Han JW, Kim G. Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites. Nat Commun 2021; 12:6814. [PMID: 34819509 PMCID: PMC8613209 DOI: 10.1038/s41467-021-26739-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 10/01/2021] [Indexed: 11/09/2022] Open
Abstract
To significantly increase the amount of exsolved particles, the complete phase reconstruction from simple perovskite to Ruddlesden-Popper (R-P) perovskite is greatly desirable. However, a comprehensive understanding of key parameters affecting the phase reconstruction to R-P perovskite is still unexplored. Herein, we propose the Gibbs free energy for oxygen vacancy formation in Pr0.5(Ba/Sr)0.5TO3-δ (T = Mn, Fe, Co, and Ni) as the important factor in determining the type of phase reconstruction. Furthermore, using in-situ temperature & environment-controlled X-ray diffraction measurements, we report the phase diagram and optimum 'x' range required for the complete phase reconstruction to R-P perovskite in Pr0.5Ba0.5-xSrxFeO3-δ system. Among the Pr0.5Ba0.5-xSrxFeO3-δ, (Pr0.5Ba0.2Sr0.3)2FeO4+δ - Fe metal demonstrates the smallest size of exsolved Fe metal particles when the phase reconstruction occurs under reducing condition. The exsolved nano-Fe metal particles exhibit high particle density and are well-distributed on the perovskite surface, showing great catalytic activity in fuel cell and syngas production.
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Affiliation(s)
- Hyunmin Kim
- grid.42687.3f0000 0004 0381 814XSchool of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea
| | - Chaesung Lim
- grid.49100.3c0000 0001 0742 4007Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673 Republic of Korea
| | - Ohhun Kwon
- grid.25879.310000 0004 1936 8972Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104 USA
| | - Jinkyung Oh
- grid.42687.3f0000 0004 0381 814XSchool of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea
| | - Matthew T. Curnan
- grid.49100.3c0000 0001 0742 4007Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673 Republic of Korea
| | - Hu Young Jeong
- grid.42687.3f0000 0004 0381 814XDepartment of Materials Science and Engineering and UNIST Central Research Facilities (UCRF), Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea
| | - Sihyuk Choi
- Department of Mechanical Engineering (Aeronautics, Mechanical and Electronic Convergence Engineering), Kumoh National Institute of Technology, Gyeongbuk, 39177, Republic of Korea.
| | - Jeong Woo Han
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
| | - Guntae Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.
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Cao T, Kwon O, Gorte RJ, Vohs JM. Metal Exsolution to Enhance the Catalytic Activity of Electrodes in Solid Oxide Fuel Cells. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E2445. [PMID: 33297343 PMCID: PMC7762234 DOI: 10.3390/nano10122445] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/01/2020] [Accepted: 12/04/2020] [Indexed: 11/16/2022]
Abstract
Exsolution is a novel technology for attaching metal catalyst particles onto ceramic anodes in the solid oxide fuel cells (SOFCs). The exsolved metal particles in the anode exhibit unique properties for reaction and have demonstrated remarkable stabilities under conditions that normally lead to coking. Despite extensive investigations, the underlying principles behind exsolution are still under investigation. In this review, the present status of exsolution materials for SOFC applications is reported, including a description of the fundamental concepts behind metal incorporation in oxide lattices, a listing of proposed mechanisms and thermodynamics of the exsolution process and a discussion on the catalytic properties of the resulting materials. Prospects and opportunities to use materials produced by exsolution for SOFC are discussed.
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Affiliation(s)
| | | | - Raymond J. Gorte
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 34th Street, Philadelphia, PA 19104, USA; (T.C.); (O.K.); (J.M.V.)
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