Na+ doping activates and stabilizes layered perovskite cathodes for high-performance fuel cells |
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| Affiliation: | 1. Anhui Key Laboratory of Low-Temperature Co-Fired Material, Huainan Engineering Research Center for Fuel Cells, Huainan Normal University, Huainan, 232001, PR China;2. School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, PR China;3. Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001, PR China;1. School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang, 471023, China;2. Key Laboratory of Material Physics of Ministry of Education, School of Physics, Zhengzhou University, Zhengzhou, 450052, China;1. Materials Engineering Department, Ponta Grossa State University, Av. Gal. Carlos Cavalcanti, 4748, 84030-900, Ponta Grossa, PR, Brazil;2. Mechanical Engineering Institute, Federal University of Itajubá. Av. BPS, 1303, 37500-903, Itajubá, MG, Brazil;1. Department of Orthopedics, Guangdong Provincial People''s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, 510080, PR China;2. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, PR China;3. National Engineering Research Center for Tissue Restoration and Reconstruction, Guangzhou, 510006, PR China;1. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;2. Kyushu University Platform of Inter-/Transdisciplinary Energy Research, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan;3. Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei, 230026, China;4. Hefei National Laboratory of Physical Science at the Micro-scale, University of Science and Technology of China, Hefei, 230026, China;1. Department of Chemistry and Chemical Engineering, Lyuliang University, Lyuliang 033001, China;2. College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China;3. Department of Chemical Engineering, COMSATS University Islamabad (CUI), Lahore Campus, 54000, Punjab, Lahore, Pakistan;4. Sustainable Process Integration Laboratory, SPIL, NETME Centre, Faculty of Mechanical Engineering, Brno University of Technology, VUT Brno, Technická 2896/2, 616 00, Brno, Czech Republic;5. Department of Chemical Engineering Technology, College of Applied Industrial Technology (CAIT), Jazan University, Kingdom of Saudi Arabia;6. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, Leuven, 3001, Belgium |
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| Abstract: | A highly active mixed conductive cathode is required for solid oxide fuel cells (SOFCs) based on yttria-stabilized zirconia (YSZ) at reduced temperatures, which is one of the most important factors for their commercialization. Herein, we propose a Na+ doping strategy to activate and stabilize the triple-conducting (H+/O2?/e?) layered perovskite oxide of representative NdBa0.5Sr0.5Co1.5Fe0.5O5+δ (NBSCF) for high-performance YSZ fuel cells. The results show that Na+ doping enhances the electrochemical properties of the NBSCF cathode, with polarization impedance decreasing from 0.105 to 0.080 Ω cm2 at 750 °C and output power increasing from 946.05 to 1435.75 mW cm?2 at 800 °C. Furthermore, high-temperature XRD (HT-XRD) and the oxygen temperature-programmed desorption (O2-TPD) further confirm that Na+ doping can improve the structural stability of NBSCF. The single cell with a Na-doped NBSCF cathode showed no degradation of current density for more than 120 h at 700 °C and exhibited good stability. This work demonstrates the promise of Na+ doping for layered perovskite cathodes and an effective way to promote fuel cell performance. |
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| Keywords: | Fuel cell Layered perovskite cathode Oxygen reduction activity Long-term stability |
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