Electrochemical characteristics of an La0.6Sr0.4Co0.2Fe0.8O3-La0.8Sr0.2MnO3 multi-layer composite cathode for intermediate-temperature solid oxide fuel cells

被引：27

作者：

Jin, Chao ^{[1
]}

Liu, Jiang ^{[1
]}

Guo, Weimin ^{[1
]}

Zhang, Yaohui ^{[1
]}

机构：

[1] S China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510641, Guangdong, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2008年 / 183卷 / 02期

关键词：

solid oxide fuel cell; LSCF; LSM; multi-layer composite cathode; cathodic polarization;

D O I：

10.1016/j.jpowsour.2008.05.049

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：

An La0.6Sr0.4CO0.2Fe0.8O3-La0.8Sr0.2MnO3 (LSCF-LSM) multi-layer composite cathode for solid oxide fuel cells (SOFCs) was prepared on an yttria-stabilized zirconia (YSZ) electrolyte by the screen-printing technique. Its cathodic polarization curves and electrochemical impedance spectra were measured and the results were compared with those for a conventional LSM/LSM-YSZ cathode. While the LSCF-LSM multilayer composite cathode exhibited a cathodic overpotential lower than 0.13 V at 750 degrees C at a Current density of 0.4 A cm(-2), the overpotential for the conventional LSM-YSZ cathode was about 0.2V. The electrochemical impedance spectra revealed a better electrochemical performance of the LSCF-LSM multi-layer composite cathode than that of the conventional LSM/LSM-YSZ cathode; e.g.. the polarization resistance value of the multi-layer composite cathode was 0.25 Omega cm(2) at 800 degrees C, nearly 40% lower than that of LSM/LSM-YSZ at the same temperature. In addition, an encouraging output power from an YSZ-supported cell using an LSCF-LSM multi-layer composite cathode was obtained. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：506 / 511

页数：6

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