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Jin Y, Cheng H, Wang Q, Liu X, Mo S, Zhou B, Peng Y, Wang Y, Si W, Li J. Insights into in situ surface reconstruction in cobalt perovskite oxides for enhanced catalytic activity. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:135113. [PMID: 38996683 DOI: 10.1016/j.jhazmat.2024.135113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Revised: 06/24/2024] [Accepted: 07/04/2024] [Indexed: 07/14/2024]
Abstract
An depth understanding of the fundamental interactions between surface termination and catalytic activity is crucial to prompt the properties of functional perovskite materials. The elastic energy due to size mismatch and electrostatic attraction of the charged Sr dopant by positively charged oxygen vacancies induced inert A-site surface enrichment rearrangement for perovskites. Lower temperatures could reduce A-site enrichment, but it is difficult to form perovskite crystals. La0.8Sr0.2CoO3-δ (LSCO) as a model perovskite oxide was modified with additive urea to reduce the crystallization temperature, and suppress Sr segregation. The LSCO catalysts with 600 °C annealing temperature (LSCO-600) exhibited a 19.4-fold reaction reactivity of toluene oxidation than that with 800 °C annealing temperature (LSCO-800). Combined surface-sensitive and depth-resolved techniques for surface and sub-surface analysis, surface Sr enrichment was effectively suppressed due to decreased oxygen vacancy concentration and smaller electrostatic driving force. DFT calculations and in-situ DRIFTs spectra well revealed that tuning the surface composition/termination affected the intrinsic reactivity. The catalyst surface with lower Sr enrichment could easily adsorb toluene, cleave, and decompose benzene rings, thus contributing to toluene degradation to CO2. This work demonstrates a green and efficient way to control surface composition and termination at the atomic scale for higher catalytic activity.
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Affiliation(s)
- Yanyu Jin
- School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; School of Chemical & Environmental Engineering, China University of Mining and Technology, Beijing 100084, China
| | - Hongjun Cheng
- School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China
| | - Qibao Wang
- School of Chemical & Environmental Engineering, China University of Mining and Technology, Beijing 100084, China
| | - Xiaoqing Liu
- School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China
| | - Shengpeng Mo
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Bin Zhou
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yue Peng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yu Wang
- School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China.
| | - Wenzhe Si
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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2
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Xu H, Qi J, Zhang Y, Liu H, Hu L, Feng M, Lü W. Magnetic Field-Enhanced Oxygen Evolution Reaction via the Tuneability of Spin Polarization in a Half-Metal Catalyst. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37384856 DOI: 10.1021/acsami.3c03713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/01/2023]
Abstract
The magnetic field response of an electrochemistry process, such as the oxygen evolution reaction (OER), provides not only a strategy for enhanced catalytic activity by applying an external field but also a platform for revealing the functionality of the multiple degrees of freedom of the catalyst. However, the mechanism of the magnetic field tuneable OER is controversial. The strong correlation between the d and p orbitals of transition metal and oxygen still puzzles the dominant role of spin in an OER process. Here in this study, we have employed the manganite La0.7Sr0.2Ca0.1MnO3 as the ferromagnetic OER catalyst, which has a ferromagnetic/paramagnetic transition (TC) around the room temperature. It is found that the overpotential can be reduced by ∼18% after applying a 5 kOe magnetic field. Furthermore, this magnetic field can trigger a further improvement of the OER performance, and it demonstrates a strong temperature dependence which is incongruent with its magnetoresistive behavior. So our experiments suggest that the observed magnetic response originates dominantly from the triplet state of the O2, where the spin-polarized d and oxygen p orbitals lower the Gibbs free energy for every reaction step in OER. This study offers experimental evidence on comprehending the spin degree in the OER process, meanwhile benefiting the further design and engineering of the promising magnetic electrochemistry catalysts.
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Affiliation(s)
- Hang Xu
- Functional Materials and Acousto-Optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China
| | - Ji Qi
- Functional Materials and Acousto-Optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China
| | - Yuan Zhang
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China
| | - Huan Liu
- Functional Materials and Acousto-Optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
| | - Linglong Hu
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China
| | - Ming Feng
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China
| | - Weiming Lü
- Functional Materials and Acousto-Optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
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Li J, Yousaf M, Akbar M, Noor A, Enyi H, Shah MAKY, Sial QA, Mushtaq N, Lu Y. High-performing and stable semiconductor yttrium-doped gadolinium electrolyte for low-temperature solid oxide fuel cells. Chem Commun (Camb) 2023; 59:6223-6226. [PMID: 37129587 DOI: 10.1039/d2cc06904k] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
High-performing electrolytes at low operating temperatures have become an inevitable trend in the development of low-temperature solid oxide fuel cells (LT-SOFCs). Such electrolytes have drawn significant attention due to their appeal for high performance. Herein, we propose a new material by doping Y3+ into Gd2O3 for LT-SOFC electrolyte use. The prepared material was characterized in terms of crystal structure, surface, and interface properties, followed by its application in LT-SOFCs. YDG delivered promising SOFC performance with a power density of 1046 mW cm-2 at 550 °C along with high ionic conductivity of 0.19 S cm-1. Moreover, impedance spectra revealed that YDG exhibited the least ohmic resistance of 0.06-0.09 Ω cm2 at 550-460 °C. Furthermore, stable operation for 60 h demonstrated the chemical stability of the material in reduced temperature environments. Density function theory was also applied to analyze the electronic band structure and density of states of the synthesized sample. Our findings thus certify that YDG as a high-performing electrolyte at low operating temperatures.
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Affiliation(s)
- Junjiao Li
- Department of Electronic and Engineering, Nanjing Vocational Institute of Mechatronic Technology, Nanjing 211306, P. R. China
| | - Muhammad Yousaf
- Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology/Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Muhammad Akbar
- Key Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei University, Wuhan, Hubei, 430062, P. R. China
| | - Asma Noor
- Shenzhen Key Laboratory of Laser Engineering, Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Hu Enyi
- Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology/Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - M A K Yousaf Shah
- Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology/Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Qadeer Akbar Sial
- Department of Physics, Ajou University Swaan, Suwon, Gyeonggi-do, Korea
| | - Naveed Mushtaq
- Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology/Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Yuzheng Lu
- College of Electronic and Engineering, Nanjing Xiaozhuang University, Nanjing 211171, P. R. China
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4
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Xue S, Chen G, Zhang J, Che R. Insight into Surface Electronic Effects on Pd Nanostructures as Efficient Electrocatalysts. NANO LETTERS 2023; 23:2778-2785. [PMID: 37010265 DOI: 10.1021/acs.nanolett.3c00056] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Although the unique properties of nanomaterials have endowed enzyme-mimic catalysts with broad applications, the development of catalysts still relies on trial-and-error strategies without predictive indicators. Surface electronic structures have rarely been studied in enzyme-mimic catalysts. Herein, we present a platform for understanding the impact of surface electronic structures on electrocatalysis toward H2O2 decomposition, using the Pd icosahedra (Pd ico), Pd octahedra (Pd oct) and Pd cubic nanocrystals as electrocatalysts. The electronic properties on Pd were modulated with a correlation of surface orientation. We revealed the relationship between the electronic properties and electrocatalytic performance, in which the surface electron accumulation can boost the electrocatalytic activity of the enzyme-mimic catalysts. As a result, the Pd icodimer exhibits the highest electrocatalytic and sensing efficiency. This work offers new perspectives for the investigation of structure-activity relationships and provides an effective knob for utilizing the surface electronic structures to boost the catalytic performance for enzyme-mimics.
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Affiliation(s)
- Shuyan Xue
- Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Academy for Engineering & Technology, Fudan University, Shanghai 200438, P. R. China
| | - Guanyu Chen
- Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Academy for Engineering & Technology, Fudan University, Shanghai 200438, P. R. China
| | | | - Renchao Che
- Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Academy for Engineering & Technology, Fudan University, Shanghai 200438, P. R. China
- Zhejiang Laboratory, Hangzhou 311100, China
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Dey S, Chaudhary S, Parvatalu D, Mukhopadhyay M, Sharma AD, Mukhopadhyay J. Advancing Electrode Properties through Functionalization for Solid Oxide Cells Application: A Review. Chem Asian J 2023; 18:e202201222. [PMID: 36621811 DOI: 10.1002/asia.202201222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 01/05/2023] [Accepted: 01/05/2023] [Indexed: 01/10/2023]
Abstract
Hydrogen energy has emerged as the only renewable which is capable of sustaining the prevalent energy crisis in conjunction with other intermittent sources. In this connection, solid oxide cell (SOC) is the most sustainable solid-state devices capable of recycling and reproducing green hydrogen fuel. It is operable in reversible modes viz, fuel cell (FC) and electrolysis cell (EC). SOC is capable of engaging multiple fuels thereby promoting carbon neutral planet. The all-solid design further augments the optimization of cost, efficiency, durability and endurance at higher temperature. Electrodes are therefore, an important component which is responsible for electrocatalytic processing of fuel and oxidant for higher recyclability of cell/stack. The present review article embarks a detailed overview on the past and present status of electrode composition, heterointerface engineering applicable for SOC's. Recent trends in electrode engineering and the possibilities for advancement in SOC is also reviewed with respect to both experimental and computational aspects.
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Affiliation(s)
- Shoroshi Dey
- Energy Materials & Devices Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, 700 032, India.,Academy of Scientific and Innovative Research (AcSIR), Gaziabad, 201002, India
| | - Saroj Chaudhary
- ONGC Energy Research Centre Trust (OECT), IEOT Complex, Energy Centre, Phase -II, Panvel, District, Raigad, 410221, India
| | - Damaraju Parvatalu
- ONGC Energy Research Centre Trust (OECT), IEOT Complex, Energy Centre, Phase -II, Panvel, District, Raigad, 410221, India
| | - Madhumita Mukhopadhyay
- Department of Materials Science & Technology, Maulana Abul Kalam Azad University of Technology (MAKAUT), West Bengal, Haringhata, 741249, India
| | - Abhijit Das Sharma
- Energy Materials & Devices Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, 700 032, India.,Academy of Scientific and Innovative Research (AcSIR), Gaziabad, 201002, India
| | - Jayanta Mukhopadhyay
- Energy Materials & Devices Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, 700 032, India.,Academy of Scientific and Innovative Research (AcSIR), Gaziabad, 201002, India
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Tang Y, Chiabrera F, Morata A, Cavallaro A, Liedke MO, Avireddy H, Maller M, Butterling M, Wagner A, Stchakovsky M, Baiutti F, Aguadero A, Tarancón A. Ion Intercalation in Lanthanum Strontium Ferrite for Aqueous Electrochemical Energy Storage Devices. ACS APPLIED MATERIALS & INTERFACES 2022; 14:18486-18497. [PMID: 35412787 DOI: 10.1021/acsami.2c01379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Ion intercalation of perovskite oxides in liquid electrolytes is a very promising method for controlling their functional properties while storing charge, which opens up its potential application in different energy and information technologies. Although the role of defect chemistry in oxygen intercalation in a gaseous environment is well established, the mechanism of ion intercalation in liquid electrolytes at room temperature is poorly understood. In this study, the defect chemistry during ion intercalation of La0.5Sr0.5FeO3-δ thin films in alkaline electrolytes is studied. Oxygen and proton intercalation into the La1-xSrxFeO3-δ perovskite structure is observed at moderate electrochemical potentials (0.5 to -0.4 V), giving rise to a change in the oxidation state of Fe (as a charge compensation mechanism). The variation of the concentration of holes as a function of the intercalation potential is characterized by in situ ellipsometry, and the concentration of electron holes is indirectly quantified for different electrochemical potentials. Finally, a dilute defect chemistry model that describes the variation of defect species during ionic intercalation is developed.
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Affiliation(s)
- Yunqing Tang
- Department of Advanced Materials for Energy Applications, Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià del Besòs, Barcelona, Spain
| | - Francesco Chiabrera
- Department of Advanced Materials for Energy Applications, Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià del Besòs, Barcelona, Spain
- Department of Energy Conversion and Storage, Functional Oxides Group, Technical University of Denmark, Fysikvej 310, 233, 2800 Kongens Lyngby, Denmark
| | - Alex Morata
- Department of Advanced Materials for Energy Applications, Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià del Besòs, Barcelona, Spain
| | - Andrea Cavallaro
- Department of Materials, Imperial College London, London SW7 2AZ, U.K
| | - Maciej O Liedke
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Hemesh Avireddy
- Department of Advanced Materials for Energy Applications, Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià del Besòs, Barcelona, Spain
| | - Mar Maller
- Department of Advanced Materials for Energy Applications, Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià del Besòs, Barcelona, Spain
| | - Maik Butterling
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Andreas Wagner
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Michel Stchakovsky
- HORIBA Scientific, 14 Boulevard Thomas Gobert, Passage Jobin Yvon, CS 45002-91120 Palaiseau, France
| | - Federico Baiutti
- Department of Advanced Materials for Energy Applications, Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià del Besòs, Barcelona, Spain
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
| | - Ainara Aguadero
- Department of Materials, Imperial College London, London SW7 2AZ, U.K
- Instituto de Ciencia de Materiales de Madrid, ICMM-CSIC, Sor Juana Ines de la Cruz 3, 28049 Madrid, Spain
| | - Albert Tarancón
- Department of Advanced Materials for Energy Applications, Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià del Besòs, Barcelona, Spain
- ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
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Yang G, El Loubani M, Hill D, Lee D. Control of crystallographic orientation in Ruddlesden-Popper for fast oxygen reduction. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.04.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Ma X, Li X, Su C, Zhu M, Miao J, Guan D, Zhou W, Shao Z. Interface engineered perovskite oxides for enhanced catalytic oxidation: The vital role of lattice oxygen. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116944] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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9
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Chen H, Lim C, Zhou M, He Z, Sun X, Li X, Ye Y, Tan T, Zhang H, Yang C, Han JW, Chen Y. Activating Lattice Oxygen in Perovskite Oxide by B-Site Cation Doping for Modulated Stability and Activity at Elevated Temperatures. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2102713. [PMID: 34658158 PMCID: PMC8596113 DOI: 10.1002/advs.202102713] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/02/2021] [Indexed: 05/07/2023]
Abstract
Doping perovskite oxide with different cations is used to improve its electro-catalytic performance for various energy and environment devices. In this work, an activated lattice oxygen activity in Pr0.4 Sr0.6 Cox Fe0.9- x Nb0.1 O3- δ (PSCxFN, x = 0, 0.2, 0.7) thin film model system by B-site cation doping is reported. As Co doping level increases, PSCxFN thin films exhibit higher concentration of oxygen vacancies ( V o • • ) as revealed by X-ray diffraction and synchrotron-based X-ray photoelectron spectroscopy. Density functional theory calculation results suggest that Co doping leads to more distortion in FeO octahedra and weaker metaloxygen bonds caused by the increase of antibonding state, thereby lowering V o • • formation energy. As a consequence, PSCxFN thin film with higher Co-doping level presents larger amount of exsolved particles on the surface. Both the facilitated V o • • formation and B-site cation exsolution lead to the enhanced hydrogen oxidation reaction (HOR) activity. Excessive Co doping until 70%, nevertheless, results in partial decomposition of thin film and degrades the stability. Pr0.4 Sr0.6 (Co0.2 Fe0.7 Nb0.1 )O3 with moderate Co doping level displays both good HOR activity and stability. This work clarifies the critical role of B-site cation doping in determining the V o • • formation process, the surface activity, and structure stability of perovskite oxides.
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Affiliation(s)
- Huijun Chen
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Chaesung Lim
- Department of Chemical EngineeringPohang University of Science and TechnologyPohangGyeongbuk37673Republic of Korea
| | - Mengzhen Zhou
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Zuyun He
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Xiang Sun
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Xiaobao Li
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
| | - Yongjian Ye
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Ting Tan
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Hui Zhang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
| | - Chenghao Yang
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Jeong Woo Han
- Department of Chemical EngineeringPohang University of Science and TechnologyPohangGyeongbuk37673Republic of Korea
| | - Yan Chen
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
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Zhou M, Liu J, Ye Y, Sun X, Chen H, Zhou D, Yin Y, Zhang N, Ling Y, Ciucci F, Chen Y. Enhancing the Intrinsic Activity and Stability of Perovskite Cobaltite at Elevated Temperature Through Surface Stress. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2104144. [PMID: 34605170 DOI: 10.1002/smll.202104144] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/27/2021] [Indexed: 06/13/2023]
Abstract
Perovskite-based oxides attract great attention as catalysts for energy and environmental devices. Nanostructure engineering is demonstrated as an effective approach for improving the catalytic activity of the materials. The mechanism for the enhancement, nevertheless, is still not fully understood. In this study, it is demonstrated that compressive strain can be introduced into freestanding perovskite cobaltite La0.8 Sr0.2 CoO3- δ (LSC) nanofibers with sufficient small size. Crystal structure analysis suggests that the LSC fiber is characterized by compressive strain along the ab plane and less distorted CoO6 octahedron compared to the bulk powder sample. Accompanied by such structural changes, the nanofiber shows significantly higher oxygen reduction reaction (ORR) activity and better stability at elevated temperature, which is attributed to the higher oxygen vacancy concentration and suppressed Sr segregation in the LSC nanofibers. First-principle calculations further suggest that the compressive strain in LSC nanofibers effectively shortens the distance between the Co 3d and O 2p band center and lowers the oxygen vacancy formation energy. The results clarify the critical role of surface stress in determining the intrinsic activity of perovskite oxide nanomaterials. The results of this work can help guide the design of highly active and durable perovskite catalysts via nanostructure engineering.
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Affiliation(s)
- Mengzhen Zhou
- State Key Laboratory of Pulp and Paper Engineering, School of Environment and Energy, South China University of Technology, Guangzhou, 510000, China
| | - Jiapeng Liu
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, 999077, China
| | - Yongjian Ye
- State Key Laboratory of Pulp and Paper Engineering, School of Environment and Energy, South China University of Technology, Guangzhou, 510000, China
| | - Xiang Sun
- State Key Laboratory of Pulp and Paper Engineering, School of Environment and Energy, South China University of Technology, Guangzhou, 510000, China
| | - Huijun Chen
- State Key Laboratory of Pulp and Paper Engineering, School of Environment and Energy, South China University of Technology, Guangzhou, 510000, China
| | - Deng Zhou
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Yimei Yin
- Institute of Electrochemical & Energy Technology, Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Nian Zhang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Yihan Ling
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, PR China
| | - Francesco Ciucci
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, 999077, China
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong, 999077, China
| | - Yan Chen
- State Key Laboratory of Pulp and Paper Engineering, School of Environment and Energy, South China University of Technology, Guangzhou, 510000, China
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Yang J, Hu S, Shi L, Hoang S, Yang W, Fang Y, Liang Z, Pan C, Zhu Y, Li L, Wu J, Hu J, Guo Y. Oxygen Vacancies and Lewis Acid Sites Synergistically Promoted Catalytic Methane Combustion over Perovskite Oxides. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:9243-9254. [PMID: 34106698 DOI: 10.1021/acs.est.1c00511] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
An in-depth understanding of the surface properties-activity relationship could provide a fundamental guidance for the design of highly efficient perovskite-based catalysts for the control of anthropogenic methane emission. Herein, both oxygen vacancies and Con+ Lewis acid sites were purposely introduced on ordered macroporous La0.8Sr0.2CoO3 monolithic catalysts by one-step reduction and selective etching in oxalic acid, and their synergistic effect on methane combustion was investigated. Combined with experimental and theoretical investigations, we revealed that the positively charged Con+ Lewis acid sites and single-electron-trapped oxygen vacancies (Vo·) formed an active pair, which enabled an effective localized electron cloud shift from Vo· to Con+. The characteristic electronic effect modulates surface electronic properties and coordination structures, thus resulting in superior oxygen activation capacity, lattice oxygen mobility, and reducibility, as well as favorable CH4 interaction and oxidation. Our work not only gives insights into surface properties-activity relationships on perovskite for hydrocarbon combustion but also sheds substantial light on future environmental catalyst design and modulation for hydrocarbon pollutants elimination.
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Affiliation(s)
- Ji Yang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Siyu Hu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Limin Shi
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Son Hoang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Weiwei Yang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Yarong Fang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Zhenfeng Liang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Chuanqi Pan
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Yuhua Zhu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Li Li
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Jian Wu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Jinpeng Hu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Yanbing Guo
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
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12
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Porotnikova N, Farlenkov A, Naumov S, Vlasov M, Khodimchuk A, Fetisov A, Ananyev M. Effect of grain boundaries in La 0.84Sr 0.16CoO 3-δ on oxygen diffusivity and surface exchange kinetics. Phys Chem Chem Phys 2021; 23:11272-11286. [PMID: 33972961 DOI: 10.1039/d1cp01099a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The single crystal and polycrystalline specimens of La0.84Sr0.16CoO3-δ oxide were synthesized and characterized by X-ray powder diffraction analysis, energy dispersive X-ray microanalysis, the electron backscatter diffraction technique, and X-ray photoelectron spectroscopy. A thin slab was prepared from the grown single crystal with its surface corresponding to the (110) plane. The kinetics of the oxygen exchange between the gas phase and a single crystal and a polycrystalline specimen was studied by means of 16O/18O oxygen isotope exchange at T = 750-850 °C and PO2 = 5.3 × 10-3-2.2 × 10-2 atm. Temperature dependencies of the oxygen heterogeneous exchange rate, the oxygen dissociative adsorption and incorporation rates, and oxygen diffusion coefficients were obtained. The relationship between the crystallographic orientation of oxides and the kinetic parameters of oxides has been established. Correlations between the surface state and the rates of individual stages of oxygen exchange as well as oxygen diffusion pathways in the single crystal compared with those in the polycrystalline specimen are considered.
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Affiliation(s)
- Natalia Porotnikova
- Institute of High Temperature Electrochemistry, UB RAS, Ekaterinburg, Russia.
| | - Andrei Farlenkov
- Ural Federal University named after the First President of Russia B.N. Yeltsin, Ekaterinburg, Russia
| | - Sergey Naumov
- Institute of Metal Physics, UB RAS, Ekaterinburg, Russia
| | - Maxim Vlasov
- Institute of High Temperature Electrochemistry, UB RAS, Ekaterinburg, Russia.
| | - Anna Khodimchuk
- Institute of High Temperature Electrochemistry, UB RAS, Ekaterinburg, Russia.
| | | | - Maxim Ananyev
- Ural Federal University named after the First President of Russia B.N. Yeltsin, Ekaterinburg, Russia
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13
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A high-entropy manganite in an ordered nanocomposite for long-term application in solid oxide cells. Nat Commun 2021; 12:2660. [PMID: 33976209 PMCID: PMC8113253 DOI: 10.1038/s41467-021-22916-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 03/29/2021] [Indexed: 02/03/2023] Open
Abstract
The implementation of nano-engineered composite oxides opens up the way towards the development of a novel class of functional materials with enhanced electrochemical properties. Here we report on the realization of vertically aligned nanocomposites of lanthanum strontium manganite and doped ceria with straight applicability as functional layers in high-temperature energy conversion devices. By a detailed analysis using complementary state-of-the-art techniques, which include atom-probe tomography combined with oxygen isotopic exchange, we assess the local structural and electrochemical functionalities and we allow direct observation of local fast oxygen diffusion pathways. The resulting ordered mesostructure, which is characterized by a coherent, dense array of vertical interfaces, shows high electrochemically activity and suppressed dopant segregation. The latter is ascribed to spontaneous cationic intermixing enabling lattice stabilization, according to density functional theory calculations. This work highlights the relevance of local disorder and long-range arrangements for functional oxides nano-engineering and introduces an advanced method for the local analysis of mass transport phenomena.
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14
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Li Z, Li M, Zhu Z. Perovskite Cathode Materials for Low-Temperature Solid Oxide Fuel Cells: Fundamentals to Optimization. ELECTROCHEM ENERGY R 2021. [DOI: 10.1007/s41918-021-00098-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Mushtaq N, Lu Y, Xia C, Dong W, Wang B, Wang X, Yousaf Shah M, Rauf S, Jingjing N, Hu E, Xiao H, Raza R, Kim JS, Zhu B. Design principle and assessing the correlations in Sb-doped Ba0.5Sr0.5FeO3–δ perovskite oxide for enhanced oxygen reduction catalytic performance. J Catal 2021. [DOI: 10.1016/j.jcat.2020.12.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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16
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Sun X, Chen H, Yin Y, Curnan MT, Han JW, Chen Y, Ma Z. Progress of Exsolved Metal Nanoparticles on Oxides as High Performance (Electro)Catalysts for the Conversion of Small Molecules. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2005383. [PMID: 33538089 DOI: 10.1002/smll.202005383] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 10/13/2020] [Indexed: 06/12/2023]
Abstract
Utilizing electricity and heat from renewable energy to convert small molecules into value-added chemicals through electro/thermal catalytic processes has enormous socioeconomic and environmental benefits. However, the lack of catalysts with high activity, good long-term stability, and low cost strongly inhibits the practical implementation of these processes. Oxides with exsolved metal nanoparticles have recently been emerging as promising catalysts with outstanding activity and stability for the conversion of small molecules, which provides new possibilities for application of the processes. In this review, it starts with an introduction on the mechanism of exsolution, discussing representative exsolution materials, the impacts of intrinsic material properties and external environmental conditions on the exsolution behavior, and the driving forces for exsolution. The performances of exsolution materials in various reactions, such as alkane reforming reaction, carbon monoxide oxidation, carbon dioxide utilization, high temperature steam electrolysis, and low temperature electrocatalysis, are then summarized. Finally, the challenges and future perspectives for the development of exsolution materials as high-performance catalysts are discussed.
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Affiliation(s)
- Xiang Sun
- School of Environment and Energy, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510006, P. R. China
| | - Huijun Chen
- School of Environment and Energy, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510006, P. R. China
| | - Yimei Yin
- Institute of Electrochemical & Energy Technology, Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Matthew T Curnan
- Department of Chemical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 37673, Korea
| | - Jeong Woo Han
- Department of Chemical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 37673, Korea
| | - Yan Chen
- School of Environment and Energy, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510006, P. R. China
| | - Zifeng Ma
- Institute of Electrochemical & Energy Technology, Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
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17
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Wang Y, Li X, Zhang M, Zhou Y, Rao D, Zhong C, Zhang J, Han X, Hu W, Zhang Y, Zaghib K, Wang Y, Deng Y. Lattice-Strain Engineering of Homogeneous NiS 0.5 Se 0.5 Core-Shell Nanostructure as a Highly Efficient and Robust Electrocatalyst for Overall Water Splitting. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2000231. [PMID: 32870547 DOI: 10.1002/adma.202000231] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Revised: 07/05/2020] [Indexed: 05/28/2023]
Abstract
Developing highly-efficient non-noble-metal electrocatalysts for water splitting is crucial for the development of clean and reversible hydrogen energy. Introducing lattice strain is an effective strategy to develop efficient electrocatalysts. However, lattice strain is typically co-created with heterostructure, vacancy, or substrate effects, which complicate the identification of the strain-activity correlation. Herein, a series of lattice-strained homogeneous NiSx Se1- x nanosheets@nanorods hybrids are designed and synthesized by a facile strategy. The NiS0.5 Se0.5 with ≈2.7% lattice strain exhibits outstanding activity for hydrogen and oxygen evolution reaction (HER/OER), affording low overpotentials of 70 and 257 mV at 10 mA cm-2 , respectively, as well as excellent long-term durability even at a large current density of 100 mA cm-2 (300 h), significantly superior to other benchmarks and the precious metal catalysts. Experimental and theoretical calculation results reveal that the generated lattice strain decreases the metal d-orbital overlap, leading to a narrower bandwidth and a closer d-band center toward the Fermi level. Thus, NiS0.5 Se0.5 possesses favorable H* adsorption kinetics for HER and lower energy barriers for OER. This work provides a new insight to regulate the lattice strain of advanced catalyst materials and further improve the performance of energy conversion technologies.
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Affiliation(s)
- Yang Wang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China
| | - Xiaopeng Li
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China
| | - Mengmeng Zhang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China
| | - Yuanguang Zhou
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China
| | - Dewei Rao
- School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China
| | - Cheng Zhong
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China
| | - Jinfeng Zhang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China
| | - Xiaopeng Han
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China
| | - Wenbin Hu
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou, 350207, China
| | - Yucang Zhang
- College of Materials and Chemical Engineering, Hainan University, Haikou, 570228, China
| | - Karim Zaghib
- Center of Excellence in Transportation Electrification and Energy Storage, Hydro-Quebec, 1806 boulevard Lionel-boulet, Varennes, Quebec, J3X 1S1, Canada
| | - Yuesheng Wang
- Center of Excellence in Transportation Electrification and Energy Storage, Hydro-Quebec, 1806 boulevard Lionel-boulet, Varennes, Quebec, J3X 1S1, Canada
| | - Yida Deng
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China
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18
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Tuning proton-coupled electron transfer by crystal orientation for efficient water oxidization on double perovskite oxides. Nat Commun 2020; 11:4299. [PMID: 32855418 PMCID: PMC7453016 DOI: 10.1038/s41467-020-17657-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 07/13/2020] [Indexed: 01/16/2023] Open
Abstract
Developing highly efficient and cost-effective oxygen evolution reaction (OER) electrocatalysts is critical for many energy devices. While regulating the proton-coupled electron transfer (PCET) process via introducing additive into the system has been reported effective in promoting OER activity, controlling the PCET process by tuning the intrinsic material properties remains a challenging task. In this work, we take double perovskite oxide PrBa0.5Sr0.5Co1.5Fe0.5O5+δ (PBSCF) as a model system to demonstrate enhancing OER activity through the promotion of PCET by tuning the crystal orientation and correlated proton diffusion. OER kinetics on PBSCF thin films with (100), (110), and (111) orientation, deposited on single crystal LaAlO3 substrates, were investigated using electrochemical measurements, density functional theory (DFT) calculations, and synchrotron-based near ambient X-ray photoelectron spectroscopy. The results clearly show that the OER activity and the ease of deprotonation depend on orientation and follow the order of (100) > (110) > (111). Correlated with OER activity, proton diffusion is found to be the fastest in the (100) film, followed by (110) and (111) films. Our results point out a way of boosting PCET and OER activity, which can also be successfully applied to a wide range of crucial applications in green energy and environment.
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19
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Chen K, Jiang SP. Surface Segregation in Solid Oxide Cell Oxygen Electrodes: Phenomena, Mitigation Strategies and Electrochemical Properties. ELECTROCHEM ENERGY R 2020. [DOI: 10.1007/s41918-020-00078-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Abstract
Solid oxide cells (SOCs) are highly efficient and environmentally benign devices that can be used to store renewable electrical energy in the form of fuels such as hydrogen in the solid oxide electrolysis cell mode and regenerate electrical power using stored fuels in the solid oxide fuel cell mode. Despite this, insufficient long-term durability over 5–10 years in terms of lifespan remains a critical issue in the development of reliable SOC technologies in which the surface segregation of cations, particularly strontium (Sr) on oxygen electrodes, plays a critical role in the surface chemistry of oxygen electrodes and is integral to the overall performance and durability of SOCs. Due to this, this review will provide a critical overview of the surface segregation phenomenon, including influential factors, driving forces, reactivity with volatile impurities such as chromium, boron, sulphur and carbon dioxide, interactions at electrode/electrolyte interfaces and influences on the electrochemical performance and stability of SOCs with an emphasis on Sr segregation in widely investigated (La,Sr)MnO3 and (La,Sr)(Co,Fe)O3−δ. In addition, this review will present strategies for the mitigation of Sr surface segregation.
Graphic Abstract
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20
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Sahare S, Ghoderao P, Khan SB, Chan Y, Lee SL. Recent progress in hybrid perovskite solar cells through scanning tunneling microscopy and spectroscopy. NANOSCALE 2020; 12:15970-15992. [PMID: 32761037 DOI: 10.1039/d0nr03499a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Currently, sustainable renewable energy sources are urgently required to fulfill the cumulative energy needs of the world's 7.8 billion population, since the conventional coal and fossil fuels will be exhausted soon. Photovoltaic devices are a direct and efficient means to produce a huge amount of energy to meet these energy targets. In particular, hybrid-perovskite-based photovoltaic devices merit special attention not only due to their exceptional efficiency for generating appreciable energy but also their tunable band gaps and the ease of device fabrication. However, the commercialization of such devices suffers from the instability of the compositional materials. The cause of instability is the perovskite's structure and its morphology at the sub-molecular level; thereby revealing and eliminating these instabilities are a striking challenge. To address this issue, scanning tunneling microscopy/spectroscopy (STM/STS) presents a comprehensive method to allow the visualization of the morphology and electronic structure of materials at atomic-level resolution. Here, we review the recent developments of perovskite-based solar cells (PSCs), the STM/STS analysis of photoactive halide/hybrid and oxide materials, and the real-time STM/STS investigation of electronic structures with defects and traps that are believed to mainly affect device performances. The detailed STM/STS analysis can facilitate a better understanding of the properties of materials at the nanoscale. This informative study may hold great promise to advance the development of stable PSCs under atmospheric conditions.
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Affiliation(s)
- Sanjay Sahare
- Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong, 518060 China. and Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronics Engineering, Shenzhen University, Shenzhen, Guangdong, 518060 China
| | - Prachi Ghoderao
- Department of Applied Physics, Defence Institute of Advanced Technology, Pune, 411025 India
| | - Sadaf Bashir Khan
- Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong, 518060 China. and Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronics Engineering, Shenzhen University, Shenzhen, Guangdong, 518060 China
| | - Yue Chan
- Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong, 518060 China.
| | - Shern-Long Lee
- Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong, 518060 China.
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21
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Buvat G, Eslamibidgoli MJ, Youssef AH, Garbarino S, Ruediger A, Eikerling M, Guay D. Effect of IrO6 Octahedron Distortion on the OER Activity at (100) IrO2 Thin Film. ACS Catal 2019. [DOI: 10.1021/acscatal.9b04347] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gaëtan Buvat
- INRS-Énergie, Matériaux Télécommunications, 1650 Lionel-Boulet Boulevard, P.O. 1020, Varennes, QC, Canada J3X 1S2
| | - Mohammad J. Eslamibidgoli
- INRS-Énergie, Matériaux Télécommunications, 1650 Lionel-Boulet Boulevard, P.O. 1020, Varennes, QC, Canada J3X 1S2
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada V5A 1S6
| | - Azza Hadj Youssef
- INRS-Énergie, Matériaux Télécommunications, 1650 Lionel-Boulet Boulevard, P.O. 1020, Varennes, QC, Canada J3X 1S2
| | | | - Andreas Ruediger
- INRS-Énergie, Matériaux Télécommunications, 1650 Lionel-Boulet Boulevard, P.O. 1020, Varennes, QC, Canada J3X 1S2
| | - Michael Eikerling
- IEK-13, Institute of Energy and Climate Research, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Daniel Guay
- INRS-Énergie, Matériaux Télécommunications, 1650 Lionel-Boulet Boulevard, P.O. 1020, Varennes, QC, Canada J3X 1S2
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22
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Shi Y, Xie R, Liu X, Zhang N, Aruta C, Yang N. Tunable pH-dependent oxygen evolution activity of strontium cobaltite thin films for electrochemical water splitting. Phys Chem Chem Phys 2019; 21:16230-16239. [PMID: 31298262 DOI: 10.1039/c9cp02278c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the oxygen evolution reaction (OER) dependence on the reaction environment pH is important to find alternative strategies to define an optimal pH value for high electrocatalytic activity. SrCoO2.5 films with the brownmillerite phase are investigated in this study for their strain effects on the OER activity, with particular regard to the pH dependence. Pulsed laser deposited films with different thicknesses and, thus, strain conditions, are characterized in terms of long range and near-order structural properties and electrochemical OER activity. By comparison, more strained thinner films have smaller OER current at lower pH conditions, but higher sensitivity to the environment pH. Spectroscopic measurements allow us to correlate such behaviors to the Co 3d-O 2p hybridization effects of the CoO6 octahedral sites, which lead to a variation of the 3d level electronic occupation. At the same time, density functional theory calculations show that the oxygen vacancy channels of the CoO4 tetrahedral sites are stable with respect to the strain effects. These results provide new perspectives to manipulate the pH dependent OER activity through the strain effects, useful for designing water splitting-based devices with optimized performances.
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Affiliation(s)
- Yanuo Shi
- Electrochemical Thin Film Group, School of Physical Science and Technology, ShanghaiTech University, Shanghai, P. R. China.
| | - Renjie Xie
- Electrochemical Thin Film Group, School of Physical Science and Technology, ShanghaiTech University, Shanghai, P. R. China.
| | - Xuetao Liu
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China and Xtalpi Inc, One Broadway, Ninth Floor, Cambridge, Massachusetts 02142, USA
| | - Nian Zhang
- Center for Excellence in Superconducting Electronics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Carmela Aruta
- CNR-SPIN, Università di Roma Tor Vergata, Via del Politecnico, 1, 00133 Roma, Italy.
| | - Nan Yang
- Electrochemical Thin Film Group, School of Physical Science and Technology, ShanghaiTech University, Shanghai, P. R. China.
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23
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Liu X, Zhang L, Zheng Y, Guo Z, Zhu Y, Chen H, Li F, Liu P, Yu B, Wang X, Liu J, Chen Y, Liu M. Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1801898. [PMID: 30937267 PMCID: PMC6425498 DOI: 10.1002/advs.201801898] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 12/03/2018] [Indexed: 05/09/2023]
Abstract
Developing cost effective electrocatalysts with high oxygen evolution reaction (OER) activity is essential for large-scale application of many electrochemical energy systems. Although the impacts of either lattice strain or oxygen defects on the OER performance of oxide catalysts have been extensively investigated, the effects of both factors are normally treated separately. In this work, the coupled effects of both strain and oxygen deficiency on the electrocatalytic activity of La0.7Sr0.3CoO3-δ (LSC) thin films grown on single crystal substrates (LaAlO3 (LAO) and SrTiO3 (STO)) are investigated. Electrochemical tests show that the OER activities of LSC films are higher under compression than under tension, and are diminished as oxygen vacancies are introduced by vacuum annealing. Both experimental and computational results indicate that the LSC films under tension (e.g., LSC/STO) have larger oxygen deficiency than the films under compression (e.g., LSC/LAO), which attribute to smaller oxygen vacancy formation energy. Such strain-induced excessive oxygen vacancies in the LSC/STO increases the eg state occupancy and enlarges the energy gap between the O 2p and Co 3d band, resulting in lower OER activity. Understanding the critical role of strain-defect coupling is important for achieving the rational design of highly active and durable catalysts for energy devices.
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Affiliation(s)
- Xi Liu
- Guangzhou Key Laboratory for Surface Chemistry of Energy MaterialsGuangdong Engineering and Technology and Research Center for Surface Chemistry of Energy MaterialsState Key Laboratory of Pulp and Paper EngineeringSchool of Environment and EnergySouth China University of TechnologyGuangzhouGuangdong510006China
| | - Lei Zhang
- Materials Science and EngineeringGeorgia Institute of TechnologyAtlantaGAUSA
| | - Yun Zheng
- Institute of Nuclear and New Energy TechnologyTsinghua UniversityBeijingChina
| | - Zheng Guo
- School of Advanced MaterialsShenzhen Graduate SchoolPeking UniversityShenzhenChina
| | - Yunmin Zhu
- Guangzhou Key Laboratory for Surface Chemistry of Energy MaterialsGuangdong Engineering and Technology and Research Center for Surface Chemistry of Energy MaterialsState Key Laboratory of Pulp and Paper EngineeringSchool of Environment and EnergySouth China University of TechnologyGuangzhouGuangdong510006China
| | - Huijun Chen
- Guangzhou Key Laboratory for Surface Chemistry of Energy MaterialsGuangdong Engineering and Technology and Research Center for Surface Chemistry of Energy MaterialsState Key Laboratory of Pulp and Paper EngineeringSchool of Environment and EnergySouth China University of TechnologyGuangzhouGuangdong510006China
| | - Fei Li
- Guangzhou Key Laboratory for Surface Chemistry of Energy MaterialsGuangdong Engineering and Technology and Research Center for Surface Chemistry of Energy MaterialsState Key Laboratory of Pulp and Paper EngineeringSchool of Environment and EnergySouth China University of TechnologyGuangzhouGuangdong510006China
| | - Peipei Liu
- Guangzhou Key Laboratory for Surface Chemistry of Energy MaterialsGuangdong Engineering and Technology and Research Center for Surface Chemistry of Energy MaterialsState Key Laboratory of Pulp and Paper EngineeringSchool of Environment and EnergySouth China University of TechnologyGuangzhouGuangdong510006China
| | - Bo Yu
- Institute of Nuclear and New Energy TechnologyTsinghua UniversityBeijingChina
| | - Xinwei Wang
- School of Advanced MaterialsShenzhen Graduate SchoolPeking UniversityShenzhenChina
| | - Jiang Liu
- Guangzhou Key Laboratory for Surface Chemistry of Energy MaterialsGuangdong Engineering and Technology and Research Center for Surface Chemistry of Energy MaterialsState Key Laboratory of Pulp and Paper EngineeringSchool of Environment and EnergySouth China University of TechnologyGuangzhouGuangdong510006China
| | - Yan Chen
- Guangzhou Key Laboratory for Surface Chemistry of Energy MaterialsGuangdong Engineering and Technology and Research Center for Surface Chemistry of Energy MaterialsState Key Laboratory of Pulp and Paper EngineeringSchool of Environment and EnergySouth China University of TechnologyGuangzhouGuangdong510006China
| | - Meilin Liu
- Materials Science and EngineeringGeorgia Institute of TechnologyAtlantaGAUSA
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Controlling the Oxygen Electrocatalysis on Perovskite and Layered Oxide Thin Films for Solid Oxide Fuel Cell Cathodes. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9051030] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Achieving the fast oxygen reduction reaction (ORR) kinetics at the cathode of solid oxide fuel cells (SOFCs) is indispensable to enhance the efficiency of SOFCs at intermediate temperatures. Mixed ionic and electronic conducting (MIEC) oxides such as ABO3 perovskites and Ruddlesden-Popper (RP) oxides (A2BO4) have been widely used as promising cathode materials owing to their attractive physicochemical properties. In particular, oxides in forms of thin films and heterostructures have enabled significant enhancement in the ORR activity. Therefore, we aim to give a comprehensive overview on the recent development of thin film cathodes of SOFCs. We discuss important advances in ABO3 and RP oxide thin film cathodes for SOFCs. Our attention is also paid to the influence of oxide heterostructure interfaces on the ORR activity of SOFC cathodes.
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25
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Zhao P, Fang F, Feng N, Chen C, Liu G, Chen L, Zhu Z, Meng J, Wan H, Guan G. Self-templating construction of mesopores on three-dimensionally ordered macroporous La0.5Sr0.5MnO3 perovskite with enhanced performance for soot combustion. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00096h] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A three-dimensionally ordered macroporous (3DOM) La0.5Sr0.5MnO3 perovskite was prepared by a colloidal crystal templating method, with extra mesopores created by selective dissolution method performed successively.
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Zhang J, Chen X, Zhang Q, Han F, Zhang J, Zhang H, Zhang H, Huang H, Qi S, Yan X, Gu L, Chen Y, Hu F, Yan S, Liu B, Shen B, Sun J. Magnetic Anisotropy Controlled by Distinct Interfacial Lattice Distortions at the La 1- xSr xCoO 3/La 2/3Sr 1/3MnO 3 Interfaces. ACS APPLIED MATERIALS & INTERFACES 2018; 10:40951-40957. [PMID: 30338983 DOI: 10.1021/acsami.8b14981] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Interface engineering is an important approach leading to multifunctional artificial materials. Although most of the previous works focused on the effects of the rotation/tilting of interfacial oxygen octahedron on perovskite multilayers, here, we report on a new kind of lattice distortion characterized by an off-center shift of the Mn ions within the MnO6 oxygen octahedra at the interfaces of La1- xSr xCoO3/La2/3Sr1/3MnO3/La1- xSr xCoO3/LaAlO3 trilayers ( x = 0-1/3), which drives the initially perpendicularly aligned magnetic axis of the La2/3Sr1/3MnO3 (LSMO) film toward the in-plane direction, though the film is in a strongly compressive state. It is further found that the magnetic anisotropy considerably depends on the content of Sr in La1- xSr xCoO3, enhancing as x decreases. The maximal anisotropy constant at 10 K is +2.5 × 106 erg/cm3 for the trilayers with x = 0, whereas it is -1.5 × 105 erg/cm3 for a bare LSMO film on LaAlO3. On the basis of the analysis of X-ray absorption spectroscopy and the results of density functional theory calculations, we found that the off-center displacement of the Mn ions has caused a strong orbital reconstruction at interfaces, resulting in the anomalous spin orientation against magnetoelastic coupling.
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Affiliation(s)
- Jine Zhang
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Xiaobing Chen
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Furong Han
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Jing Zhang
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Hui Zhang
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Hongrui Zhang
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Hailin Huang
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Shaojin Qi
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Xi Yan
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Lin Gu
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Yuansha Chen
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Fengxia Hu
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Shishen Yan
- Spintronics Institute , University of Jinan , Jinan 250022 , Shandong , People's Republic of China
| | - Banggui Liu
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Baogen Shen
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Jirong Sun
- Beijing National Laboratory for Condensed Matter Physics & Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
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Li F, Li Y, Chen H, Li H, Zheng Y, Zhang Y, Yu B, Wang X, Liu J, Yang C, Chen Y, Liu M. Impact of Strain-Induced Changes in Defect Chemistry on Catalytic Activity of Nd 2NiO 4+δ Electrodes. ACS APPLIED MATERIALS & INTERFACES 2018; 10:36926-36932. [PMID: 30277376 DOI: 10.1021/acsami.8b11877] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
It is well known that defect chemistry plays a vital role in determining the electronic structure, ionic conductivity, and catalytic activity of metal oxides, as demonstrated in perovskite-based oxides to achieve desired functionalities. In this work, we explored the possibility of tuning the defect chemistry and hydrogen oxidation reaction (HOR) activity of Nd2NiO4+δ model thin films by controlling the lattice strain. Highly textured Nd2NiO4+δ thin films with different strain states were prepared on (110)- and (100)-oriented single-crystal yttrium-stabilized zirconium (YSZ) substrates using pulsed laser deposition. Electrochemical impedance spectroscopy results indicated that the NNO(100) film on the YSZ(110) substrate with larger tensile strain in the a- b plane and compressive strain along the c axis exhibited higher HOR activity than the NNO(110) film on the YSZ(100) substrate at 500-600 °C. The enhancement in HOR activity is attributed to the strain-induced difference in the oxygen defect concentration, as confirmed by high-resolution X-ray diffraction analysis. We believe that the correlation among the strain state, defect chemistry, and catalytic properties is helpful for rational design of more efficient electrode materials.
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Affiliation(s)
| | - Yifeng Li
- Institute of Nuclear and New Energy Technology (INET) , Tsinghua University , 30 Shuang'qing Road , Beijing 100084 , P. R. China
| | | | - Hao Li
- School of Advanced Materials, Shenzhen Graduate School , Peking University , Shenzhen 518055 , China
| | - Yun Zheng
- Institute of Nuclear and New Energy Technology (INET) , Tsinghua University , 30 Shuang'qing Road , Beijing 100084 , P. R. China
| | | | - Bo Yu
- Institute of Nuclear and New Energy Technology (INET) , Tsinghua University , 30 Shuang'qing Road , Beijing 100084 , P. R. China
| | - Xinwei Wang
- School of Advanced Materials, Shenzhen Graduate School , Peking University , Shenzhen 518055 , China
| | | | | | | | - Meilin Liu
- Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332-0245 , United States
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28
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Rupp GM, Kubicek M, Opitz AK, Fleig J. In Situ Impedance Analysis of Oxygen Exchange on Growing La 0.6Sr 0.4CoO 3-δ Thin Films. ACS APPLIED ENERGY MATERIALS 2018; 1:4522-4535. [PMID: 30272051 PMCID: PMC6158676 DOI: 10.1021/acsaem.8b00586] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 08/20/2018] [Indexed: 06/08/2023]
Abstract
The further development of solid oxide fuel and electrolysis cells (SOFC/SOEC) strongly relies on research activities dealing with electrode materials. Recent studies showed that under operating conditions many perovskite-type oxide electrodes are prone to changes of their surface composition, leading to severe changes of their electrochemical performance. This results in a large scatter of data in literature and complicates comparison of materials. Moreover, little information is available on the potentially excellent properties of surfaces immediately after preparation, that is, before any degradation by exposure to other gas compositions or temperature changes. Here, we introduce in situ impedance spectroscopy during pulsed laser deposition (IPLD) as a new method for electrochemical analysis of mixed ionic and electronic conducting (MIEC) thin films during growth. First, this approach can truly reveal the properties of as-prepared MIEC electrode materials, since it avoids any alterations of their surface between preparation and investigation. Second, the measurements during growth give information on the thickness dependence of film properties. This technique is applied to La0.6Sr0.4CoO3-δ (LSC), one of the most promising SOFC/SOEC oxygen electrode material. From the earliest stages of LSC film deposition on yttria-stabilized zirconia (YSZ) to a fully grown thin film of 100 nm thickness, data are gained on the oxygen exchange kinetics and the defect chemistry of LSC. A remarkable reproducibility is found in repeated film growth experiments, not only for the bulk related chemical capacitance but also for the surface related polarization resistance (±10%). Polarization resistances of as-prepared LSC films are extraordinarily low (2.0 Ω cm2 in 40 μbar O2 at 600 °C). LSC films on YSZ and on La0.95Sr0.05Ga0.95Mg0.05O3-δ (LSGM) single crystals exhibit significantly different electrochemical properties, possibly associated with the tensile strain of LSC on LSGM.
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Symmetry mismatch-driven perpendicular magnetic anisotropy for perovskite/brownmillerite heterostructures. Nat Commun 2018; 9:1923. [PMID: 29765023 PMCID: PMC5953968 DOI: 10.1038/s41467-018-04304-7] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 04/18/2018] [Indexed: 12/22/2022] Open
Abstract
Grouping different transition metal oxides together by interface engineering is an important route toward emergent phenomenon. While most of the previous works focused on the interface effects in perovskite/perovskite heterostructures, here we reported on a symmetry mismatch-driven spin reorientation toward perpendicular magnetic anisotropy in perovskite/brownmillerite heterostructures, which is scarcely seen in tensile perovskite/perovskite heterostructures. We show that alternately stacking perovskite La2/3Sr1/3MnO3 and brownmillerite LaCoO2.5 causes a strong interface reconstruction due to symmetry discontinuity at interface: neighboring MnO6 octahedra and CoO4 tetrahedra at the perovskite/brownmillerite interface cooperatively relax in a manner that is unavailable for perovskite/perovskite interface, leading to distinct orbital reconstructions and thus the perpendicular magnetic anisotropy. Moreover, the perpendicular magnetic anisotropy is robust, with an anisotropy constant two orders of magnitude greater than the in-plane anisotropy of the perovskite/perovskite interface. The present work demonstrates the great potential of symmetry engineering in designing artificial materials on demand. Complex oxide heterostructures exhibit multifunctional behaviour that could be used in a range of device applications. Here, the authors observe that reconstruction at oxide perovskite/brownmillerite interfaces leads to perpendicular magnetic spin orientation, with potential use in spintronic devices.
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30
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Zheng Y, Wang J, Yu B, Zhang W, Chen J, Qiao J, Zhang J. A review of high temperature co-electrolysis of H 2O and CO 2 to produce sustainable fuels using solid oxide electrolysis cells (SOECs): advanced materials and technology. Chem Soc Rev 2018; 46:1427-1463. [PMID: 28165079 DOI: 10.1039/c6cs00403b] [Citation(s) in RCA: 158] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
High-temperature solid oxide electrolysis cells (SOECs) are advanced electrochemical energy storage and conversion devices with high conversion/energy efficiencies. They offer attractive high-temperature co-electrolysis routes that reduce extra CO2 emissions, enable large-scale energy storage/conversion and facilitate the integration of renewable energies into the electric grid. Exciting new research has focused on CO2 electrochemical activation/conversion through a co-electrolysis process based on the assumption that difficult C[double bond, length as m-dash]O double bonds can be activated effectively through this electrochemical method. Based on existing investigations, this paper puts forth a comprehensive overview of recent and past developments in co-electrolysis with SOECs for CO2 conversion and utilization. Here, we discuss in detail the approaches of CO2 conversion, the developmental history, the basic principles, the economic feasibility of CO2/H2O co-electrolysis, and the diverse range of fuel electrodes as well as oxygen electrode materials. SOEC performance measurements, characterization and simulations are classified and presented in this paper. SOEC cell and stack designs, fabrications and scale-ups are also summarized and described. In particular, insights into CO2 electrochemical conversions, solid oxide cell material behaviors and degradation mechanisms are highlighted to obtain a better understanding of the high temperature electrolysis process in SOECs. Proposed research directions are also outlined to provide guidelines for future research.
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Affiliation(s)
- Yun Zheng
- Institute of Nuclear and New Energy Technology (INET), Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, 30 Shuang'qing Road, Beijing 100084, P. R. China.
| | - Jianchen Wang
- Institute of Nuclear and New Energy Technology (INET), Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, 30 Shuang'qing Road, Beijing 100084, P. R. China.
| | - Bo Yu
- Institute of Nuclear and New Energy Technology (INET), Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, 30 Shuang'qing Road, Beijing 100084, P. R. China.
| | - Wenqiang Zhang
- Institute of Nuclear and New Energy Technology (INET), Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, 30 Shuang'qing Road, Beijing 100084, P. R. China.
| | - Jing Chen
- Institute of Nuclear and New Energy Technology (INET), Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, 30 Shuang'qing Road, Beijing 100084, P. R. China.
| | - Jinli Qiao
- College of Environmental Science and Engineering, Donghua University, 2999 Ren'min North Road, Shanghai 201620, P. R. China.
| | - Jiujun Zhang
- NRC Energy, Mining & Environment, National Research Council of Canada, 4250 Wesbrook Mall, Vancouver, B.C. V6T 1W5, Canada. and College of Sciences, Shanghai University, Shanghai 200444, P. R. China.
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31
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Li Y, Zhang W, Zheng Y, Chen J, Yu B, Chen Y, Liu M. Controlling cation segregation in perovskite-based electrodes for high electro-catalytic activity and durability. Chem Soc Rev 2018; 46:6345-6378. [PMID: 28920603 DOI: 10.1039/c7cs00120g] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Solid oxide cell (SOC) based energy conversion systems have the potential to become the cleanest and most efficient systems for reversible conversion between electricity and chemical fuels due to their high efficiency, low emission, and excellent fuel flexibility. Broad implementation of this technology is however hindered by the lack of high-performance electrode materials. While many perovskite-based materials have shown remarkable promise as electrodes for SOCs, cation enrichment or segregation near the surface or interfaces is often observed, which greatly impacts not only electrode kinetics but also their durability and operational lifespan. Since the chemical and structural variations associated with surface enrichment or segregation are typically confined to the nanoscale, advanced experimental and computational tools are required to probe the detailed composition, structure, and nanostructure of these near-surface regions in real time with high spatial and temporal resolutions. In this review article, an overview of the recent progress made in this area is presented, highlighting the thermodynamic driving forces, kinetics, and various configurations of surface enrichment and segregation in several widely studied perovskite-based material systems. A profound understanding of the correlation between the surface nanostructure and the electro-catalytic activity and stability of the electrodes is then emphasized, which is vital to achieving the rational design of more efficient SOC electrode materials with excellent durability. Furthermore, the methodology and mechanistic understanding of the surface processes are applicable to other materials systems in a wide range of applications, including thermo-chemical photo-assisted splitting of H2O/CO2 and metal-air batteries.
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Affiliation(s)
- Yifeng Li
- Institute of Nuclear and New Energy Technology (INET), Tsinghua University, 30 Shuang'qing Road, Beijing 100084, P. R. China.
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32
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Activating cobalt(II) oxide nanorods for efficient electrocatalysis by strain engineering. Nat Commun 2017; 8:1509. [PMID: 29138406 PMCID: PMC5686154 DOI: 10.1038/s41467-017-01872-y] [Citation(s) in RCA: 172] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 10/11/2017] [Indexed: 11/29/2022] Open
Abstract
Designing high-performance and cost-effective electrocatalysts toward oxygen evolution and hydrogen evolution reactions in water–alkali electrolyzers is pivotal for large-scale and sustainable hydrogen production. Earth-abundant transition metal oxide-based catalysts are particularly active for oxygen evolution reaction; however, they are generally considered inactive toward hydrogen evolution reaction. Here, we show that strain engineering of the outermost surface of cobalt(II) oxide nanorods can turn them into efficient electrocatalysts for the hydrogen evolution reaction. They are competitive with the best electrocatalysts for this reaction in alkaline media so far. Our theoretical and experimental results demonstrate that the tensile strain strongly couples the atomic, electronic structure properties and the activity of the cobalt(II) oxide surface, which results in the creation of a large quantity of oxygen vacancies that facilitate water dissociation, and fine tunes the electronic structure to weaken hydrogen adsorption toward the optimum region. The efficiencies of materials-based catalysts are determined by the surface atomic and electronic structures, but harnessing this relationship can be challenging. Here, by engineering strain into cobalt oxide, the authors transform a once poor hydrogen evolution catalyst into one that is competitive with the state of the art.
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Li J, Wang J, Kuang H, Zhang HR, Zhao YY, Qiao KM, Wang F, Liu W, Wang W, Peng LC, Zhang Y, Yu RC, Hu FX, Sun JR, Shen BG. Oxygen defect engineering by the current effect assisted with temperature cycling in a perovskite-type La 0.7Sr 0.3CoO 3 film. NANOSCALE 2017; 9:13214-13221. [PMID: 28853487 DOI: 10.1039/c7nr03162a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Introducing and modulating the oxygen deficiency concentration have been received as an effective way to obtain high catalytic activity in perovskite oxides. However, it is difficult to control the oxygen vacancy in conventional oxygen defect engineering due to harsh reaction conditions at elevated temperatures and the reducing atmosphere, which make it impractical for many technological applications. Herein, we report a new approach to oxygen defect engineering based on the combination of the current effect and temperature cycling at low temperature. Our investigations revealed that the electrical conductivity of the (011)-La0.7Sr0.3CoO3/PMN-PT film changes continuously from metallicity to insulativity under repeated transport measurements below room temperature, which indicates the transformation of the Co4+ state to Co3+ in the film. Further experiments and analysis revealed that oxygen vacancies can be well regulated by the combined current effect and temperature cycling in repeated measurements, which results in a decrease of Co4+/Co3+ and thus the remarkable variation of conductive properties of the film. Our work provides a simple and highly efficient method to engineer oxygen vacancies in perovskite-type oxides and brings new opportunities in designing high-efficiency oxidation catalysts.
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Affiliation(s)
- J Li
- Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
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Equilibrium oxygen storage capacity of ultrathin CeO 2-δ depends non-monotonically on large biaxial strain. Nat Commun 2017; 8:15360. [PMID: 28516915 PMCID: PMC5454370 DOI: 10.1038/ncomms15360] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2017] [Accepted: 03/17/2017] [Indexed: 11/26/2022] Open
Abstract
Elastic strain is being increasingly employed to enhance the catalytic properties of mixed ion–electron conducting oxides. However, its effect on oxygen storage capacity is not well established. Here, we fabricate ultrathin, coherently strained films of CeO2-δ between 5.6% biaxial compression and 2.1% tension. In situ ambient pressure X-ray photoelectron spectroscopy reveals up to a fourfold enhancement in equilibrium oxygen storage capacity under both compression and tension. This non-monotonic variation with strain departs from the conventional wisdom based on a chemical expansion dominated behaviour. Through depth profiling, film thickness variations and a coupled photoemission–thermodynamic analysis of space-charge effects, we show that the enhanced reducibility is not dominated by interfacial effects. On the basis of ab initio calculations of oxygen vacancy formation incorporating defect interactions and vibrational contributions, we suggest that the non-monotonicity arises from the tetragonal distortion under large biaxial strain. These results may guide the rational engineering of multilayer and core–shell oxide nanomaterials. The surface oxygen storage capacity is an important metric of catalytic activity, but its dependence on strain is not well characterized. Here, the authors show the surface oxygen nonstoichiometry in coherently strained CeO2-δ films increases non-monotonically with biaxial strain.
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35
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Enhanced CO catalytic oxidation by Sr reconstruction on the surface of La xSr 1-xCoO 3-δ. Sci Bull (Beijing) 2017; 62:658-664. [PMID: 36659310 DOI: 10.1016/j.scib.2017.03.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 03/02/2017] [Accepted: 03/03/2017] [Indexed: 01/21/2023]
Abstract
Surface electronic structure of solid materials plays a critical role in heterogeneous catalysis. However, surface chemical composition of the perovskite oxides is usually dominated by segregated A-site cations and the amount of oxygen vacancies is relatively low, which seriously restricts their catalytic oxidation property. Here, we prepare perovskite LaxSr1-xCoO3-δ (x=0.3, 0.5, 0.7) with different Sr doping amount and experiment results show that perovskite LSCO with higher content of surface Sr possesses more oxygen vacancies and better catalytic activity. On this basis, we develop a new experimental strategy to create more surface oxygen vacancies to promote their CO catalytic activity. In this method, we use high active hydrogen atoms (BH4-) as reductant to realize surface in-situ chemical composite modification of LaxSr1-xCoO3-δ (x=0.3, 0.5, 0.7), which causes their surface reconstruction (surface Sr enrichment). The regulation mainly focuses on the atomic layer level without damaging their bulk phase structure. Different from traditional high temperature annealing under reducing atmosphere, this method is high-efficiency, green and controllable. Furthermore, we study the surface reconstruction process and demonstrated that it is atomic layer engineering on the surface of LaxSr1-xCoO3-δ (x=0.3, 0.5, 0.7) by X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS). Our experiment results also show that these samples treated by this method exhibit superior activity for CO oxidation compared with original samples.
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36
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A niobium and tantalum co-doped perovskite cathode for solid oxide fuel cells operating below 500 °C. Nat Commun 2017; 8:13990. [PMID: 28045088 PMCID: PMC5216129 DOI: 10.1038/ncomms13990] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 11/18/2016] [Indexed: 11/30/2022] Open
Abstract
The slow activity of cathode materials is one of the most significant barriers to realizing the operation of solid oxide fuel cells below 500 °C. Here we report a niobium and tantalum co-substituted perovskite SrCo0.8Nb0.1Ta0.1O3−δ as a cathode, which exhibits high electroactivity. This cathode has an area-specific polarization resistance as low as ∼0.16 and ∼0.68 Ω cm2 in a symmetrical cell and peak power densities of 1.2 and 0.7 W cm−2 in a Gd0.1Ce0.9O1.95-based anode-supported fuel cell at 500 and 450 °C, respectively. The high performance is attributed to an optimal balance of oxygen vacancies, ionic mobility and surface electron transfer as promoted by the synergistic effects of the niobium and tantalum. This work also points to an effective strategy in the design of cathodes for low-temperature solid oxide fuel cells. Sluggish activity of cathode materials impedes operation of solid oxide fuel cells at low temperatures. Here, the authors report a niobium and tantalum co-doped perovskite cathode exhibiting high electroactivity below 500 °C, and argue that the dopants improve the cathode performance synergistically.
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37
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Shi Y, Lee SC, Monti M, Wang C, Feng ZA, Nix WD, Toney MF, Sinclair R, Chueh WC. Growth of Highly Strained CeO 2 Ultrathin Films. ACS NANO 2016; 10:9938-9947. [PMID: 27934073 DOI: 10.1021/acsnano.6b04081] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Large biaxial strain is a promising route to tune the functionalities of oxide thin films. However, large strain is often not fully realized due to the formation of misfit dislocations at the film/substrate interface. In this work, we examine the growth of strained ceria (CeO2) thin films on (001)-oriented single crystal yttria-stabilized zirconia (YSZ) via pulsed-laser deposition. By varying the film thickness systematically between 1 and 430 nm, we demonstrate that ultrathin ceria films are coherently strained to the YSZ substrate for thicknesses up to 2.7 nm, despite the large lattice mismatch (∼5%). The coherency is confirmed by both X-ray diffraction and high-resolution transmission electron microscopy. This thickness is several times greater than the predicted equilibrium critical thickness. Partial strain relaxation is achieved by forming semirelaxed surface islands rather than by directly nucleating dislocations. In situ reflective high-energy electron diffraction during growth confirms the transition from 2-D (layer-by-layer) to 3-D (island) at a film thickness of ∼1 nm, which is further supported by atomic force microscopy. We propose that dislocations likely nucleate near the surface islands and glide to the film/substrate interface, as evidenced by the presence of 60° dislocations. An improved understanding of growing oxide thin films with a large misfit lays the foundation to systematically explore the impact of strain and dislocations on properties such as ionic transport and redox chemistry.
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Affiliation(s)
- Yezhou Shi
- Department of Materials Science and Engineering and ‡Department of Applied Physics, Stanford University , Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource and ∥Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - Sang Chul Lee
- Department of Materials Science and Engineering and ‡Department of Applied Physics, Stanford University , Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource and ∥Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - Matteo Monti
- Department of Materials Science and Engineering and ‡Department of Applied Physics, Stanford University , Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource and ∥Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - Colvin Wang
- Department of Materials Science and Engineering and ‡Department of Applied Physics, Stanford University , Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource and ∥Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - Zhuoluo A Feng
- Department of Materials Science and Engineering and ‡Department of Applied Physics, Stanford University , Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource and ∥Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - William D Nix
- Department of Materials Science and Engineering and ‡Department of Applied Physics, Stanford University , Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource and ∥Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - Michael F Toney
- Department of Materials Science and Engineering and ‡Department of Applied Physics, Stanford University , Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource and ∥Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - Robert Sinclair
- Department of Materials Science and Engineering and ‡Department of Applied Physics, Stanford University , Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource and ∥Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - William C Chueh
- Department of Materials Science and Engineering and ‡Department of Applied Physics, Stanford University , Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource and ∥Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
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Roles of Bulk and Surface Chemistry in the Oxygen Exchange Kinetics and Related Properties of Mixed Conducting Perovskite Oxide Electrodes. MATERIALS 2016; 9:ma9100858. [PMID: 28773978 PMCID: PMC5456601 DOI: 10.3390/ma9100858] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2016] [Revised: 10/04/2016] [Accepted: 10/10/2016] [Indexed: 11/21/2022]
Abstract
Mixed conducting perovskite oxides and related structures serving as electrodes for electrochemical oxygen incorporation and evolution in solid oxide fuel and electrolysis cells, respectively, play a significant role in determining the cell efficiency and lifetime. Desired improvements in catalytic activity for rapid surface oxygen exchange, fast bulk transport (electronic and ionic), and thermo-chemo-mechanical stability of oxygen electrodes will require increased understanding of the impact of both bulk and surface chemistry on these properties. This review highlights selected work at the International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, set in the context of work in the broader community, aiming to characterize and understand relationships between bulk and surface composition and oxygen electrode performance. Insights into aspects of bulk point defect chemistry, electronic structure, crystal structure, and cation choice that impact carrier concentrations and mobilities, surface exchange kinetics, and chemical expansion coefficients are emerging. At the same time, an understanding of the relationship between bulk and surface chemistry is being developed that may assist design of electrodes with more robust surface chemistries, e.g., impurity tolerance or limited surface segregation. Ion scattering techniques (e.g., secondary ion mass spectrometry, SIMS, or low energy ion scattering spectroscopy, LEIS) with high surface sensitivity and increasing lateral resolution are proving useful for measuring surface exchange kinetics, diffusivity, and corresponding outer monolayer chemistry of electrodes exposed to typical operating conditions. Beyond consideration of chemical composition, the use of strain and/or a high density of active interfaces also show promise for enhancing performance.
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Taibl S, Fafilek G, Fleig J. Impedance spectra of Fe-doped SrTiO3 thin films upon bias voltage: inductive loops as a trace of ion motion. NANOSCALE 2016; 8:13954-13966. [PMID: 27088884 DOI: 10.1039/c6nr00814c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Mass and charge transport properties of slightly Fe-doped SrTiO3 (Fe:STO) thin films on a conducting substrate were investigated by means of impedance spectroscopy under different bias voltages and I-V measurements with varying scan rates. At measurement temperatures between 325 °C and 700 °C the applied bias voltage caused an unusual "inductive loop" in the low frequency range of impedance spectra. DC measurements showed that current-voltage curves strongly depend on the scan rate, indicating that different states of the sample became accessible to probe. Both findings can be understood in terms of bias induced ion motion, i.e. by stoichiometry polarization within the Fe:STO thin films upon voltage. Hence, the appearance of an "inductive loop" in the impedance spectra is considered a very general feature that might exist for many materials, particularly in oxide thin films. It may indicate ion motion and stoichiometry variations taking place in the corresponding frequency range.
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Affiliation(s)
- S Taibl
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9-164/EC, 1060 Vienna, Austria.
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40
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Hao S, Cui L, Wang H, Jiang D, Liu Y, Yan J, Ren Y, Han X, Brown DE, Li J. Retaining Large and Adjustable Elastic Strains of Kilogram-Scale Nb Nanowires. ACS APPLIED MATERIALS & INTERFACES 2016; 8:2917-2922. [PMID: 26745016 DOI: 10.1021/acsami.5b10840] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Individual metallic nanowires can sustain ultralarge elastic strains of 4-7%. However, achieving and retaining elastic strains of such magnitude in kilogram-scale nanowires are challenging. Here, we find that under active load, ∼ 5.6% elastic strain can be achieved in Nb nanowires embedded in a metallic matrix deforming by detwinning. Moreover, large tensile (2.8%) and compressive (-2.4%) elastic strains can be retained in kilogram-scale Nb nanowires when the external load was fully removed, and adjustable in magnitude by processing control. It is then demonstrated that the retained tensile elastic strains of Nb nanowires can increase their superconducting transition temperature and critical magnetic field, in comparison with the unstrained original material. This study opens new avenues for retaining large and tunable elastic strains in great quantities of nanowires and elastic-strain-engineering at industrial scale.
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Affiliation(s)
- Shijie Hao
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China
| | - Lishan Cui
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China
| | - Hua Wang
- State Key Laboratory for Mechanical Behavior of Materials and Frontier Institute of Science and Technology, Xi'an Jiaotong University , Xi'an 710049, China
| | - Daqiang Jiang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China
| | - Yinong Liu
- School of Mechanical and Chemical Engineering, The University of Western Australia , Crawley, Washington 6009, Australia
| | - Jiaqiang Yan
- Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
- Department of Materials Science and Engineering, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Yang Ren
- X-ray Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Xiaodong Han
- Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology , Beijing 100124, China
| | - Dennis E Brown
- Department of Physics, Northern Illinois University , De Kalb, Illinois 60115, United States
| | - Ju Li
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China
- Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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41
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Tsvetkov N, Lu Q, Yildiz B. Improved electrochemical stability at the surface of La(0.8)Sr(0.2)CoO3 achieved by surface chemical modification. Faraday Discuss 2016; 182:257-69. [PMID: 26227310 DOI: 10.1039/c5fd00023h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The degradation of the surface chemistry on perovskite (ABO3) oxides is a critical issue for their performance in energy conversion systems such as solid oxide fuel/electrolysis cells and in splitting of H2O and CO2 to produce fuels. This degradation is typically in the form of segregation and phase separation of dopant cations from the A-site, driven by elastic and electrostatic energy minimization and kinetic demixing. In this study, deposition of Ti at the surface was found to hinder the dopant segregation and the corresponding electrochemical degradation on a promising SOFC cathode material, La(0.8)Sr(0.2)CoO3 (LSC). The surface of the LSC films was modified by Ti (denoted as LSC-T) deposited from a TiCl4 solution. The LSC and LSC-T thin films were investigated by electrochemical impedance spectroscopy, nano-probe Auger electron spectroscopy, and X-ray photoelectron spectroscopy (XPS), upon annealing at 420-530 °C in air up to about 90 hours. The oxygen exchange coefficient, k(q), on LSC-T cathodes was found to be up to 8 times higher than that on LSC cathodes at 530 °C and retained its stability. Sr-rich insulating particles formed at the surface of the annealed LSC and LSC-T films, but with significantly less coverage of such particles on the LSC-T. From this result, it appears that modification of the LSC surface with Ti reduces the segregation of the blocking Sr-rich particles at the surface, and a larger area on LSC surface (with a higher Sr doping level in the lattice) is available for the oxygen reduction reaction. The stabilization of the LSC surface through Ti-deposition can open a new route for designing surface modifications on perovskite oxide electrodes for high temperature electro- and thermo-chemical applications.
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Affiliation(s)
- Nikolai Tsvetkov
- Laboratory for Electrochemical Interfaces, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. and Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
| | - Qiyang Lu
- Laboratory for Electrochemical Interfaces, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. and Department of Material Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
| | - Bilge Yildiz
- Laboratory for Electrochemical Interfaces, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. and Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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Wu T, Yu B, Zhang W, Chen J, Zhao S. Fabrication of a high-performance nano-structured Ln1−xSrxMO3−δ (Ln = La, Sm; M = Mn, Co, Fe) SOC electrode through infiltration. RSC Adv 2016. [DOI: 10.1039/c6ra11932h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In order to solve the problem of degradation and enhance electrochemical activity of oxygen electrode, an effective method is that utilizing the electrode/electrolyte material as a scaffold and then infiltrating oxygen electrode materials into it.
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Affiliation(s)
- Tong Wu
- Institute of Nuclear and New Energy Technology
- Collaborative Innovation Center of Advanced Nuclear Energy Technology
- Tsinghua University
- Beijing 100084
- China
| | - Bo Yu
- Institute of Nuclear and New Energy Technology
- Collaborative Innovation Center of Advanced Nuclear Energy Technology
- Tsinghua University
- Beijing 100084
- China
| | - Wenqiang Zhang
- Institute of Nuclear and New Energy Technology
- Collaborative Innovation Center of Advanced Nuclear Energy Technology
- Tsinghua University
- Beijing 100084
- China
| | - Jing Chen
- Institute of Nuclear and New Energy Technology
- Collaborative Innovation Center of Advanced Nuclear Energy Technology
- Tsinghua University
- Beijing 100084
- China
| | - Suoqi Zhao
- China University of Petroleum
- Beijing 102200
- China
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43
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Chen Y, Ojha S, Tsvetkov N, Kim DH, Yildiz B, Ross CA. Spinel/perovskite cobaltite nanocomposites synthesized by combinatorial pulsed laser deposition. CrystEngComm 2016. [DOI: 10.1039/c6ce01445c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Kwon H, Lee W, Han JW. Suppressing cation segregation on lanthanum-based perovskite oxides to enhance the stability of solid oxide fuel cell cathodes. RSC Adv 2016. [DOI: 10.1039/c6ra15253h] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Relieving the elastic interaction, which is a key origin of dopant segregation on the surface of LaBO3-type perovskites, by using the proper A- and B-site cations is a way to suppress the dopant segregation which often degrades SOFC performance.
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Affiliation(s)
- Hyunguk Kwon
- Department of Chemical Engineering
- University of Seoul
- Seoul 130-743
- Republic of Korea
| | - Wonyoung Lee
- School of Mechanical Engineering
- Sungkyunkwan University
- Suwon 440-746
- Republic of Korea
| | - Jeong Woo Han
- Department of Chemical Engineering
- University of Seoul
- Seoul 130-743
- Republic of Korea
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45
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Tsekouras G, Boudoire F, Pal B, Vondráček M, Prince KC, Sarma DD, Braun A. Electronic structure origin of conductivity and oxygen reduction activity changes in low-level Cr-substituted (La,Sr)MnO3. J Chem Phys 2015; 143:114705. [PMID: 26395726 DOI: 10.1063/1.4931033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The electronic structure of the (La(0.8)Sr(0.2))(0.98)Mn(1-x)Cr(x)O3 model series (x = 0, 0.05, or 0.1) was measured using soft X-ray synchrotron radiation at room and elevated temperature. O K-edge near-edge X-ray absorption fine structure (NEXAFS) spectra showed that low-level chromium substitution of (La,Sr)MnO3 resulted in lowered hybridisation between O 2p orbitals and M 3d and M 4sp valance orbitals. Mn L3-edge resonant photoemission spectroscopy measurements indicated lowered Mn 3d-O 2p hybridisation with chromium substitution. Deconvolution of O K-edge NEXAFS spectra took into account the effects of exchange and crystal field splitting and included a novel approach whereby the pre-peak region was described using the nominally filled t(2g) ↑ state. 10% chromium substitution resulted in a 0.17 eV lowering in the energy of the t(2g) ↑ state, which appears to provide an explanation for the 0.15 eV rise in activation energy for the oxygen reduction reaction, while decreased overlap between hybrid O 2p-Mn 3d states was in qualitative agreement with lowered electronic conductivity. An orbital-level understanding of the thermodynamically predicted solid oxide fuel cell cathode poisoning mechanism involving low-level chromium substitution on the B-site of (La,Sr)MnO3 is presented.
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Affiliation(s)
- George Tsekouras
- Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Florent Boudoire
- Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Banabir Pal
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, India
| | - Martin Vondráček
- Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Kevin C Prince
- Materials Science Beamline, Elettra Synchrotron, Trieste, Italy
| | - D D Sarma
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, India
| | - Artur Braun
- Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
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Investigations on structures, thermal expansion and electrochemical properties of La0.75Sr0.25Cu0.5−xCoxMn0.5O3−δ (x=0, 0.25, and 0.5) as potential cathodes for intermediate temperature solid oxide fuel cells. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.10.166] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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47
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Assessment of LaM0.25Mn0.75O3- (M = Fe, Co, Ni, Cu) as promising cathode materials for intermediate-temperature solid oxide fuel cells. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.04.085] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Piovano A, Ceretti M, Johnson MR, Agostini G, Paulus W, Lamberti C. Anisotropy in the Raman scattering of a CaFeO2.5 single crystal and its link with oxygen ordering in Brownmillerite frameworks. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:225403. [PMID: 25989601 DOI: 10.1088/0953-8984/27/22/225403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Periodic DFT calculations allow an understanding of the strong orientation-dependent Raman spectra of oriented CaFeO2.5 single crystals. Modes involving the oscillation of the apical oxygen (O(ap)) atoms perturb the induced electric dipoles. These are formed by anisotropy in the charge distribution and are found to be strongly enhanced when the electric field of the linearly polarized laser line is parallel to the b axis. For the CaFeO2.5 ordered system, strong polarizability of these modes corresponds to strong Raman intensities. Conversely, the apical oxygen disorder observed in low-temperature oxygen-conducting SrFeO2.5 destroys the long-range coherence of the respective Raman modes, which consequently show a strongly reduced intensity. This study provides a vibrational tool to discriminate between ordered and disordered isomorporphous ABO2.5 Brownmillerite frameworks. Furthermore, in combination with DFT calculations, we have found that the weakening of the interlayer interactions is responsible for the loss of ordering in Brownmillerite compounds.
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Affiliation(s)
- Andrea Piovano
- Institut Laue-Langevin (ILL), 71 avenue des Martyrs, 38000 Grenoble, France
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49
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Sun L, Marrocchelli D, Yildiz B. Edge dislocation slows down oxide ion diffusion in doped CeO2 by segregation of charged defects. Nat Commun 2015; 6:6294. [DOI: 10.1038/ncomms7294] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Accepted: 01/15/2015] [Indexed: 12/11/2022] Open
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50
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Tsvetkov N, Lu Q, Chen Y, Yildiz B. Accelerated oxygen exchange kinetics on Nd2NiO(4+δ) thin films with tensile strain along c-axis. ACS NANO 2015; 9:1613-1621. [PMID: 25651454 DOI: 10.1021/nn506279h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The influence of the lattice strain on the kinetics of the oxygen reduction reaction (ORR) was investigated at the surface of Nd2NiO4+δ (NNO). Nanoscale dense NNO thin films with tensile, compressive and no strain along the c-axis were fabricated by pulsed laser deposition on single-crystalline Y0.08Zr0.92O2 substrates. The ORR kinetics on the NNO thin film cathodes was investigated by electrochemical impedance spectroscopy at 360-420 °C in air. The oxygen exchange kinetics on the NNO films with tensile strain along the c-axis was found to be 2-10 times faster than that on the films with compressive strain along the c-axis. A larger concentration of oxygen interstitials (δ) is found in the tensile NNO films compared to the films with no strain or compressive strain, deduced from the measured chemical capacitance. This is consistent with the increase in the distance between the NdO rock-salt layers observed by transmission electron microscopy. The surface structure of the nonstrained and tensile strained films remained stable upon annealing in air at 500 °C, while a significant morphology change accompanied by the enrichment of Nd was found at the surface of the films with compressive strain. The faster ORR kinetics on the tensile strained NNO films was attributed to the ability of these films to incorporate oxygen interstitials more easily, and to the better stability of the surface chemistry in comparison to the nonstrained or compressively strained films.
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Affiliation(s)
- Nikolai Tsvetkov
- Laboratory for Electrochemical Interfaces, ‡Department of Nuclear Science and Engineering, §Department of Materials Science and Engineering, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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