Enhanced oxygen reduction reaction activity and electrochemical performance of A-site deficient (La0.6Sr0.4)1-xFe0.8Ni0.2O3−δ cathode for solid oxide fuel cells |
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| Affiliation: | 1. Research Center of Solid Oxide Fuel Cell, China University of Mining and Technology-Beijing, Beijing, 100083, China;2. Department of Energy Conversion and Storage, Technical University of Denmark, Kgs. Lyngby, 2800, Denmark;1. Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, 100083, China;2. Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, CAGS, Zhengzhou, 450006, China;3. Shandong aofu Environmental Protection Technology Limited Company, Dezhou, 251599, China;1. School of Physical Science and Technology, Yangzhou University, Yangzhou, 225002, PR China;2. Guangling College, Yangzhou University, Yangzhou, 225000, PR China;3. Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, PR China;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, China;2. National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, China;3. Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou, 510006, China;1. Key Laboratory of Science and Technology on High-tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China;2. University of Chinese Academy of Sciences, Beijing, 100049, PR China;1. College of Physical Science and Technology, Xiamen University, Xiamen, 361005, China;2. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China;1. Department of Physics, University of Lucknow, Lucknow, 226007, Uttar Pradesh, India;2. Department of Prosthodontics, King George Medical University, Shah Mina Road, Chowk, Lucknow, 226003, Uttar Pradesh, India;3. Department of Mechanical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi, 221005, UP, India |
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| Abstract: | In this work, (La0.6Sr0.4)0.9Fe0.8Ni0.2O3-δ (LSFN90), a stable, highly ORR-active and cost-efficient perovskite oxide, is developed as cathode materials for solid oxide fuel cell (SOFC). The introduction of A-site deficiency results in the crystal expansion of the cubic perovskite phase and an increase in oxygen vacancy concentration at operating temperature. The LSFN90 cathode displays good oxygen reduction reaction activity and low polarization resistance values. The A-site deficiency facilitates the diffusion of oxygen ions in the electrode and accelerates the surface oxygen exchange reaction. LSFN90 is used as cathode materials for SOFC to prepare anode-supported single cells, achieving maximum power densities of 1.51, 1.27, 0.95 and 0.63 W cm−2 under wet hydrogen (3%H2O–97%H2) atmosphere at 850, 800, 750 and 700 °C, respectively. The introduction of A-site deficiency can greatly enhance the oxygen reduction reaction activity and electrochemical performance of the cathode, demonstrating that LSFN90 has significant potential as a cathode material for practical applications in solid oxide fuel cells. |
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| Keywords: | Solid oxide fuel cell (SOFC) A-site deficiency Cathode Distribution of relaxation times (DRT) |
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