Electrochemical characterization of Co-doped Sr0.8Ce0.2MnO3-δ cathodes on Sm0.2Ce0.8O1.9-electrolyte for intermediate-temperature solid oxide fuel cells

被引：7

作者：

Gu, Haitao ^{[1
]}

Chen, Han ^{[1
]}

Gao, Ling ^{[1
]}

Zheng, Yifeng ^{[1
]}

Zhu, Xiaofang ^{[1
]}

Guo, Lucun ^{[1
]}

机构：

[1] Nanjing Univ Technol, Coll Mat Sci & Engn, Nanjing 210009, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2009年 / 54卷 / 13期

关键词：

Solid oxide fuel cells; Electrochemical impedance spectroscopy; Oxygen reduction reaction; Cathodic polarization; Overpotential; ELECTRICAL-PROPERTIES; OXYGEN REDUCTION; COMPOSITE CATHODE; PEROVSKITE OXIDE; SOFC CATHODES; PERFORMANCE; ELECTROLYTE;

D O I：

10.1016/j.electacta.2008.12.039

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Electrochemical properties of Co-doped Sr0.8Ce0.2MnO3-delta cathode were investigated at the cathode/Sm0.2Ce0.8O1.9 electrolyte interface. The electrochemical impedance spectroscopy was measured under applied cathodic voltages (E = -0.4 to 0V). At E = OV, the area-specific resistance decreased from 2.20 Omega cm(2) to 0.19 Omega cm(2) at 700 degrees C with Co doping. Under the cathodic polarization, the rate determining step of oxygen reduction process was different for both cathodes: the charge transfer for Sr0.8Ce0.2MnO3-delta and the diffusion process for Sr0.8Ce0.2Mn0.8Co0.2O3-delta. Besides, the overpotential also decreased from 124 mV to 19 mV at the current density of 0.1 A cm(-2) at 800 degrees C with Co doping. The improved electrochemical properties of Co-doped Sr0.8Ce0.2MnO3-delta can be ascribed to the formation of more oxygen vacancies and more active sites for oxygen reduction reaction. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：3532 / 3537

页数：6

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