固体燃料电池阴极材料La0.6Sr0.4Co0.2Fe0.8O3-δ的微观结构与阻抗特性研究

doi:10.3724/SP.J.1077.2008.00719

无机材料学报

固体燃料电池阴极材料La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ的微观结构与阻抗特性研究

苏丹, 朱满康, 侯育冬, 汪浩, 严辉

北京工业大学材料学院, 北京 100022

收稿日期:2007-09-03 修回日期:2007-11-16 出版日期:2008-07-20 网络出版日期:2008-07-20

Microstructure and Impedance Analysis of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δfor Solid Oxide Fuel Cell Cathode

SU Dan, ZHU Man-Kang, HOU Yu-Dong, WANG Hao, YAN Hui

College of Materials, Beijing University of Technology, Beijing 100022, China

Received:2007-09-03 Revised:2007-11-16 Published:2008-07-20 Online:2008-07-20

摘要/Abstract

摘要： 复合钙钛矿氧化物La_1-xSr_xCo_1-yFe_yO_3-δ是一种适于中温固体氧化物燃料电池的阴极材料. 采用柠檬酸螯合法合成了La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ粉体, 并通过XRD和SEM, 研究了前驱体溶液pH值和煅烧温度对其粉体晶相结构的影响; 同时, 通过烧结体的SEM和交流阻抗分析, 详细讨论了前驱体溶液pH值和烧结温度对烧结体显微结构和阻抗特性的影响. 结果表明, 前驱体溶液pH=4、煅烧温度为900℃的粉体, 1400℃下烧结2h获得的烧结体, 具有最低的阻抗.

关键词: La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ, 柠檬酸法, 微观结构, 阻抗特性

Abstract: Composite perovskite oxides La_1-xSr_xCo_1-yFe_yO_3-δ (LSCF) is an optional cathode material for the intermediate temperature solid oxide fuel cells. La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ powders were synthesized by a citrate method. The effects of the precursor solution pH value and the calcining temperature on the phase structure of the LSCF powders were investigated by Xray diffraction. Besides, the impacts of the precursor solution pH value and sintering temperature on the morphology and impedance characteristics of the LSCF sintered bodies were studied by SEM, AC impedance analysis, respectively. The alternatecurrent impedances of the LSCF sintered bodies were analysized based on the Voigttype equivalent circuit model.
The results show that the LSCF sintered body has the lowest impedance in the condition that the precursor solution pH is 4, the calcination temperature is 900℃, and the sintering temperature is 1400℃ for 2h, respectively.

Key words: La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ, citrate method, microstructure, impedance analysis

中图分类号:

TM911

苏丹,朱满康,侯育冬,汪浩,严辉. 固体燃料电池阴极材料La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ的微观结构与阻抗特性研究[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2008.00719.

SU Dan,ZHU Man-Kang,HOU Yu-Dong,WANG Hao,YAN Hui. Microstructure and Impedance Analysis of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δfor Solid Oxide Fuel Cell Cathode[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00719.

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固体燃料电池阴极材料La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ的微观结构与阻抗特性研究

Microstructure and Impedance Analysis of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δfor Solid Oxide Fuel Cell Cathode

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固体燃料电池阴极材料La0.6Sr0.4Co0.2Fe0.8O3-δ的微观结构与阻抗特性研究

Microstructure and Impedance Analysis of La0.6Sr0.4Co0.2Fe0.8O3-δ for Solid Oxide Fuel Cell Cathode

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固体燃料电池阴极材料La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ的微观结构与阻抗特性研究

Microstructure and Impedance Analysis of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δfor Solid Oxide Fuel Cell Cathode