Pd–La0.6Sr0.4Co0.2Fe0.8O3–δ composite as active and stable oxygen electrode for reversible solid oxide cells |
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| Affiliation: | 1. Center for Fuel Cell Innovation, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China;2. Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China;1. Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Russia;2. Ural Federal University, Institute of Hydrogen Energy, Russia;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. Center for Fuel Cell Innovation, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China;2. Research Institute of Huazhong University of Science and Technology in Shenzhen, Shenzhen, Guangdong 518000, China;1. School of Mechanical and Electrical Engineering, School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, PR China;2. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi, China;3. Department of Chemistry & Chemical Engineering, Lahore University of Management Sciences (LUMS), Pakistan;4. Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, 842 15, Bratislava, Slovakia;5. College of Electronics and Information Engineering, Shenzhen University, Shenzhen, Guangdong Province, 518000, China;6. Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL–30239, Krakow, Poland;1. Hefei National Laboratory for Physical Science at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science & Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, PR China;2. Research Institute, State Grid Anhui Electric Power Co. Ltd., Hefei, Anhui 230601, PR China |
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| Abstract: | To promote the electrocatalytic activity and stability of traditional La0.6Sr0.4Co0.2Fe0.8O3–δ (LSCF) oxygen electrodes in reversible solid oxide cells (RSOCs), conventional physical mixed method was used to prepare the Pd-LSCF composite oxygen electrode. The cell with Pd-LSCF|GDC|YSZ|Ni-YSZ configuration shows perfect electrochemical performance in both solid oxide fuel cell (SOFC) mode and solid oxide electrolysis cell (SOEC) mode. In the SOFC mode, the cell achieves a power density of 1.73 W/cm2 at 800 °C, higher than that of the LSCF oxygen electrode with 1.38 W/cm2. In the SOEC mode, the current density at 1.5 V is 1.67 A/cm2 at 800 °C under 50 vol% steam concentration. Moreover, the reversibility and stability of the RSOCs were tested during 192 h long-term reversible operation. The degradation rate of the cell is only 2.2%/100 h and 2.5%/100 h in the SOEC and the SOFC modes, respectively. These results confirm that compositing Pd with the LSCF oxygen electrode can considerably boost the electrochemical performance of LSCF electrode in RSOCs field. |
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| Keywords: | Reversible solid oxide cells Composite Oxygen electrode Electrochemical performance Rare earths |
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