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Development of (La,Sr)MnO[sub 3]-Based Cathodes for Intermediate Temperature Solid Oxide Fuel Cells

2003; Electrochemical Society; Volume: 6; Issue: 4 Linguagem: Inglês

10.1149/1.1558351

1944-8775

San Ping Jiang, Yongjun Leng, Siew Hwa Chan, K.A. Khor,

Magnetic and transport properties of perovskites and related materials

Conventional (La, (LSM) electrodes modified by ion impregnation methods showed promising potential as cathodes for intermediate temperature solid oxide fuel cells. After impregnation of ionic conducting-type nitrite salt solution into the LSM structure, electrochemical activity of LSM electrodes for the reduction reaction was substantially enhanced. At 700°C, the electrode polarization resistance of impregnated LSM electrodes decreased to 0.72 Ω cm2 as compared to 26.4 Ω cm2 for pure LSM electrodes, a reduction in electrode polarization resistance by 36 times. The polarization losses were also reduced substantially. At 300 mA cm−2 and 700°C, overpotential for the reduction was reduced from 0.79 V on pure LSM to 0.19 V on impregnated LSM electrodes, a reduction in overpotential by four times. Ion-impregnated LSM electrodes showed better performance than those of and composite electrodes as reported in the literature. © 2003 The Electrochemical Society. All rights reserved.