Boosting the electrochemical performance of cobalt-free Fe-based cathodes by calcium-doping for solid oxide fuel cells

被引：7
作者：
Yu, Zhenqiang [1 ]
Zhang, Xingquan [1 ]
Lu, Zhe [2 ]
Li, Huan [1 ]
机构：
[1] Jiangxi Univ Sci & Technol, Coll Rare Earths, 86 Hong Qi Rd, Ganzhou 341000, Peoples R China
[2] Harbin Inst Technol, Dept Phys, 92 Xi Dazhi St, Harbin 150001, Heilongjiang, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2024年 / 980卷
关键词：
Solid oxide fuel cells; Oxygen reduction reaction; Calcium; -doping; Electrochemical performance; ELECTRICAL-PROPERTIES; PARTIAL SUBSTITUTION; OXYGEN; SM; ELECTROLYTE; PEROVSKITE; CONDUCTIVITY; IMPROVEMENT; ND; CA;
D O I：
10.1016/j.jallcom.2024.173646
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A key obstacle to commercialization of solid oxide fuel cells is the sluggish oxygen reduction on the cathodes. In this work, a series of calcium-doped La0.5-xCaxBa0.5FeO3-delta (x = 0-0.2) are developed as highly active cathode materials and systematically evaluated their physicochemical properties. Among all the components, the La0.35Ca0.15Ba0.5FeO3-delta cathode delivers the minimal polarization resistance (0.059 Omega cm(2)) and maximum power densities (452 mW cm(-2)) at 800 degrees C, and possesses better stability after long-term operation. Based on the analysis results of electrochemical impedance spectra and distribution of relaxation time, the adsorption process of oxygen on the La0.35Ca0.15Ba0.5FeO3-delta cathode surface is proved to be the major rate-limiting step. These results suggest that La0.35Ca0.15Ba0.5FeO3-delta can be used as a candidate cathode material for solid oxide fuel cells.
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页数：9
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