Boosting the electrocatalytic performance of Fe-based perovskite cathode electrocatalyst for solid oxide fuel cells |
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| Affiliation: | 1. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600, UKM Bangi, Selangor, Malaysia;2. Centre for Materials Engineering and Smart Manufacturing (MERCU), Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, UKM Bangi, Selangor, Malaysia;3. Faculty of Engineering Technology, Universiti Malaysia Perlis (UniMAP), Kampus UniCITI Alam, Sungai Chuchuh, Padang Besar, 02100, Perlis, Malaysia;1. Division of Fuel Cells, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Shandong University of Science and Technology, 579 Qianwangang Road, 266590, China;1. School of Resources, Environment and Safety Engineering, University of South China, Hengyang, Hunan Province 421001, China;2. School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan Province 421001, China |
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| Abstract: | The development of cathode materials with excellent electrocatalytic activity and CO2 tolerance is an important direction for the wide application of solid oxide fuel cells. Herein, the cobalt-free perovskite oxides Bi0.5Sr0.5Fe1-xVxO3-δ (BSFVx, x = 0.025, 0.05 and 0.075) are developed as the efficient cathode electrocatalysts for SOFCs. The V-doping strategy is beneficial to improve the thermal stability, CO2 tolerance and electrochemical performance of undoped Bi0.5Sr0.5FeO3-δ. Among all samples, Bi0.5Si0.5Fe0.95V0.05O3-δ (BSFV0.05) cathode presents excellent oxygen reduction reaction activity, achieving a lower polarization resistance of 0.076 Ω cm2 and the peak power density of the single cell with the BSFV0.05 cathode reaches to 1.16 W cm−2 at 700 °C, which can be comparable to those of the representative cobalt-based cathodes. Furthermore, the improved CO2 tolerance of the BSFV0.05 cathode can be ascribed to the high acidity of the V5+ and the larger average bonding energy in the oxide. |
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| Keywords: | Solid oxide fuel cells Electrocatalytic activity Oxygen reduction reaction |
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