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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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Bonkowski A, Wolf MJ, Wu J, Parker SC, Klein A, De Souza RA. A Single Model for the Thermodynamics and Kinetics of Metal Exsolution from Perovskite Oxides. J Am Chem Soc 2024. [PMID: 39116036 DOI: 10.1021/jacs.4c03412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
Exsolution has emerged as an outstanding route for producing oxide-supported metal nanoparticles. For ABO3-perovskite oxides, various late transition-metal cations can be substituted into the lattice under oxidizing conditions and exsolved as metal nanoparticles after reduction. A consistent and comprehensive description of the point-defect thermodynamics and kinetics of this phenomenon is lacking, however. Herein, supported by hybrid density-functional-theory calculations, we propose a single model that explains diverse experimental observations, such as why substituent transition-metal cations (but not host cations) exsolve from perovskite oxides upon reduction; why different substituent transition-metal cations exsolve under different conditions; why the metal nanoparticles are embedded in the surface; why exsolution occurs surprisingly rapidly at relatively low temperatures; and why the reincorporation of exsolved species involves far longer times and much higher temperatures. Our model's foundation is that the substituent transition-metal cations are reduced to neutral species within the perovskite lattice as the Fermi level is shifted upward within the bandgap upon sample reduction. The calculations also indicate unconventional influences of oxygen vacancies and A-site vacancies. Our model thus provides a fundamental basis for improving existing, and creating new, exsolution-generated catalysts.
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Affiliation(s)
- Alexander Bonkowski
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany
| | - Matthew J Wolf
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany
| | - Ji Wu
- Department of Chemistry, University of Bath, Claverton Down, BA2 7AY Bath, U.K
| | - Stephen C Parker
- Department of Chemistry, University of Bath, Claverton Down, BA2 7AY Bath, U.K
| | - Andreas Klein
- Institute of Materials Science, Technical University of Darmstadt, Otto-Berndt-Str. 3, 64287 Darmstadt, Germany
| | - Roger A De Souza
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany
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3
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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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Bonmassar N, Christiani G, Logvenov G, Suyolcu YE, van Aken PA. Offcut Substrate-Induced Defect Trapping at Step Edges. NANO LETTERS 2024; 24:5556-5561. [PMID: 38668651 PMCID: PMC11082922 DOI: 10.1021/acs.nanolett.4c00832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 04/21/2024] [Accepted: 04/23/2024] [Indexed: 05/01/2024]
Abstract
We report step edge-induced localized defects suppressing subsequent antiphase boundary formation in the bulk structure of a trilayer oxide heterostructure. The heterostructure encompasses a layer of La0.66Sr0.34MnO3 sandwiched between a superconducting La1.84Sr0.16CuO4 bottom layer and an insulating La2CuO4 top layer. The combination of a minor a-axis mismatch (0.11 Å) and a pronounced c-axis mismatch (2.73 Å) at the step edges leads to the emergence of localized defects exclusively forming at the step edge. Employing atomically resolved electron energy-loss spectroscopy maps, we discern the electronic state of those structures in the second La0.66Sr0.34MnO3 unit cell near the step edge. In particular, a reduction in the pre-edge region of the O-K edge indicates the formation of oxygen vacancies induced by the strained step edge. This study underscores our capability to control defects at the nanoscale.
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Affiliation(s)
- Nicolas Bonmassar
- Max Planck Institute for Solid State
Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - Georg Christiani
- Max Planck Institute for Solid State
Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - Gennady Logvenov
- Max Planck Institute for Solid State
Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - Y. Eren Suyolcu
- Max Planck Institute for Solid State
Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - Peter A. van Aken
- Max Planck Institute for Solid State
Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
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5
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Kang S, Kim JK, Kim H, Son YH, Chang J, Kim J, Kim DW, Lee JM, Kwon HJ. Local Structures of Ex-Solved Nanoparticles Identified by Machine-Learned Potentials. NANO LETTERS 2024; 24:4224-4232. [PMID: 38557115 DOI: 10.1021/acs.nanolett.4c00388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
In this study, we identify the local structures of ex-solved nanoparticles using machine-learned potentials (MLPs). We develop a method for training machine-learned potentials by sampling local structures of heterointerface configurations as a training set with its efficacy tested on the Ni/MgO system, illustrating that the error in interface energy is only 0.004 eV/Å2. Using the developed scheme, we train an MLP for the Ni/La0.5Ca0.5TiO3 ex-solution system and identify the local structures for both exo- and endo-type particles. The established model aligns well with the experimental observations, accurately predicting a nucleation size of 0.45 nm. Lastly, the density functional theory calculations on the established atomistic model verify that the kinetic barrier for the dry reforming of methane are substantially reduced by 0.49 eV on the ex-solved catalysts compared to that on the impregnated catalysts. Our findings offer insights into the local structures, growth mechanisms, and underlying origin of the catalytic properties of ex-solved nanoparticles.
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Affiliation(s)
- Sungwoo Kang
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Jun Kyu Kim
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Hyunah Kim
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - You-Hwan Son
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Jaehee Chang
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Jinwoo Kim
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Dong-Wook Kim
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Jong-Min Lee
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Hyuk Jae Kwon
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
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Zhu S, Fan J, Li Z, Wu J, Xiao M, Du P, Wang X, Jia L. Metal exsolution from perovskite-based anodes in solid oxide fuel cells. Chem Commun (Camb) 2024; 60:1062-1071. [PMID: 38167745 DOI: 10.1039/d3cc05688k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Solid oxide fuel cells (SOFCs) are highly efficient and environmentally friendly devices for converting fuel into electrical energy. In this regard, metal nanoparticles (NPs) loaded onto the anode oxide play a crucial role due to their exceptional catalytic activity. NPs synthesized through exsolution exhibit excellent dispersion and stability, garnering significant attention for comprehending the exsolution process mechanism and consequently improving synthesis effectiveness. This review presents recent advancements in the exsolution process, focusing on the influence of oxygen vacancies, A-site defects, lattice strain, and phase transformation on the variation of the octahedral crystal field in perovskites. Moreover, we offer insights into future research directions to further enhance our understanding of the mechanism and achieve significant exsolution of NPs on perovskites.
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Affiliation(s)
- Shasha Zhu
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, P. R. China.
| | - Junde Fan
- Yueyang Yumeikang Biotechnology Co., Ltd., Yueyang, 414100, P. R. China
| | - Zongbao Li
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, P. R. China.
| | - Jun Wu
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, P. R. China.
| | - Mengqin Xiao
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, P. R. China.
| | - Pengxuan Du
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, P. R. China.
| | - Xin Wang
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, P. R. China.
| | - Lichao Jia
- School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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Ding H, Hadaeghi N, Zhang MH, Jiang TS, Zintler A, Carstensen L, Zhang YX, Kleebe HJ, Zhang HB, Molina-Luna L. Translational Antiphase Boundaries in NaNbO 3 Antiferroelectrics. ACS APPLIED MATERIALS & INTERFACES 2023; 15:59964-59972. [PMID: 38085261 DOI: 10.1021/acsami.3c15141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2023]
Abstract
Planar defects are known to be of importance in affecting the functional properties of materials. Translational antiphase boundaries (APBs) in particular have attracted considerable attention in perovskite oxides, but little is known in lead-free antiferroelectric oxides that are promising candidates for energy storage applications. Here, we present a study of translational APBs in prototypical antiferroelectric NaNbO3 using aberration-corrected (scanning) transmission electron microscopy (TEM) techniques at different length scales. The translational APBs in NaNbO3 are characterized by a 2-fold-modulated structure, which is antipolar in nature and exhibits a high density, different from the polar nature and lower density in PbZrO3. The high stability of translational APBs against external electric fields and elevated temperatures was revealed using ex situ and in situ TEM experiments and is expected to be associated with their antipolar nature. Density functional theory calculations demonstrate that translational APBs possess only slightly higher free energy than the antiferroelectric and ferroelectric phase energies with differences of 29 and 33 meV/f.u., respectively, justifying their coexistence down to the nanoscale at room temperature. These results provide a detailed atomistic elucidation of translational APBs in NaNbO3 with antipolar character and stability against external stimuli, establishing the basis of defect engineering of antiferroelectrics for energy storage devices.
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Affiliation(s)
- Hui Ding
- Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64289, Germany
| | - Niloofar Hadaeghi
- Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64289, Germany
| | - Mao-Hua Zhang
- Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64289, Germany
| | - Tian-Shu Jiang
- Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64289, Germany
| | - Alexander Zintler
- Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64289, Germany
| | - Leif Carstensen
- Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64289, Germany
| | - Yi-Xuan Zhang
- Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64289, Germany
| | - Hans-Joachim Kleebe
- Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64289, Germany
| | - Hong-Bin Zhang
- Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64289, Germany
| | - Leopoldo Molina-Luna
- Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64289, 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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Shen Y, Liu T, Li R, Lv H, Ta N, Zhang X, Song Y, Liu Q, Feng W, Wang G, Bao X. In situ electrochemical reconstruction of Sr 2Fe 1.45Ir 0.05Mo 0.5O 6-δ perovskite cathode for CO 2 electrolysis in solid oxide electrolysis cells. Natl Sci Rev 2023; 10:nwad078. [PMID: 37565207 PMCID: PMC10411681 DOI: 10.1093/nsr/nwad078] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 02/23/2023] [Accepted: 03/07/2023] [Indexed: 08/12/2023] Open
Abstract
Solid oxide electrolysis cells provide a practical solution for the direct conversion of CO2 to other chemicals (i.e. CO), however, an in-depth mechanistic understanding of the dynamic reconstruction of active sites for perovskite cathodes during CO2 electrolysis remains a great challenge. Herein, we identify that iridium-doped Sr2Fe1.45Ir0.05Mo0.5O6-δ (SFIrM) perovskite displays a dynamic electrochemical reconstruction feature during CO2 electrolysis with abundant exsolution of highly dispersed IrFe alloy nanoparticles on the SFIrM surface. The in situ reconstructed IrFe@SFIrM interfaces deliver a current density of 1.46 A cm-2 while maintaining over 99% CO Faradaic efficiency, representing a 25.8% improvement compared with the Sr2Fe1.5Mo0.5O6-δ counterpart. In situ electrochemical spectroscopy measurements and density functional theory calculations suggest that the improved CO2 electrolysis activity originates from the facilitated formation of carbonate intermediates at the IrFe@SFIrM interfaces. Our work may open the possibility of using an in situ electrochemical poling method for CO2 electrolysis in practice.
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Affiliation(s)
- Yuxiang Shen
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tianfu Liu
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Rongtan Li
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Houfu Lv
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Na Ta
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xiaomin Zhang
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yuefeng Song
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Qingxue Liu
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Weicheng Feng
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guoxiong Wang
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xinhe Bao
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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10
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Han H, Deniz H, Parkin SSP. Strain-driven formation of epitaxial nanostructures in brownmillerite strontium cobaltite thin films. Proc Natl Acad Sci U S A 2023; 120:e2221651120. [PMID: 36913577 PMCID: PMC10041114 DOI: 10.1073/pnas.2221651120] [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: 12/29/2022] [Accepted: 02/09/2023] [Indexed: 03/15/2023] Open
Abstract
Nanostructured materials can display unique physical properties and are of particular interest for their new functionalities. Epitaxial growth is a promising approach for the controlled synthesis of nanostructures with desired structures and crystallinity. SrCoOx is a particularly intriguing material owing to a topotactic phase transition between an antiferromagnetic insulating brownmillerite SrCoO2.5 (BM-SCO) phase and a ferromagnetic metallic perovskite SrCoO3-δ (P-SCO) phase depending on the oxygen concentration. Here, we present the formation and control of epitaxial BM-SCO nanostructures by substrate-induced anisotropic strain. Perovskite substrates with a (110)-orientation and which allow for compressive strain result in the creation of BM-SCO nanobars, while (111)-oriented substrates give rise to the formation of BM-SCO nanoislands. We have found that substrate-induced anisotropic strain coupled with the orientation of crystalline domains determines the shape and facet of the nanostructures, while their size can be tuned by the degree of strain. Moreover, the nanostructures can be transformed between antiferromagnetic BM-SCO and ferromagnetic P-SCO via ionic liquid gating. Thus, this study provides insights into the design of epitaxial nanostructures whose structure and physical properties can be readily controlled.
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Affiliation(s)
- Hyeon Han
- Max Planck Institute of Microstructure Physics, Halle (Saale)06120, Germany
| | - Hakan Deniz
- Max Planck Institute of Microstructure Physics, Halle (Saale)06120, Germany
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