Boron Poisoning of (La, Sr)(Co, Fe)O3 Cathodes of Solid Oxide Fuel Cells

被引：3
|
作者：
Chen, Kongfa [1 ]
Hyodo, Junji [2 ]
Zhao, Ling [1 ]
Ai, Na [1 ]
Ishihara, Tatsumi [2 ]
Jiang, San Ping [1 ]
机构：
[1] Curtin Univ, Fuels & Energy Technol Inst, Perth, WA 6102, Australia
[2] Kyushu Univ, Dept Appl Chem, Fac Engn, Fukuoka, Japan
来源：
SOLID OXIDE FUEL CELLS 13 (SOFC-XIII) | 2013年 / 57卷 / 01期
基金：
中国国家自然科学基金; 澳大利亚研究理事会;
关键词：
SURFACE EXCHANGE PROPERTIES; LONG-TERM PERFORMANCE; STABILIZED ZIRCONIA; DEGRADATION; DESTABILIZATION; MICROSTRUCTURE; (LA; SR)MNO3; ELECTRODE; GLASS;
D O I：
10.1149/05701.1821ecst
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Effect of volatile boron species on the properties of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode materials has been studied in detail by using porous electrode coatings and dense bar samples. Prior to the characterization, the LSCF samples were heat-treated at 800 degrees C in air in the presence of borosilicate glass for 7 and 30 days. Heat-treatment in the presence of glass has a significant detrimental effect on the surface exchange rate, electrical properties, and electrochemical activity of the cathodes. Secondary ion mass spectroscopy (SIMS) detected the deposition of boron as well as sodium and potassium on the surface and in the bulk of the bar samples. The boron deposition results in significant microstructure and composition changes. Sr in the form of SrB2O4 is enriched on the outmost surface of LSCF bar samples, leading to the Srdeficient in the adjacent layer in the bulk. The present study demonstrates the remarkable detrimental effect of volatile boron species on the microstructure and electrochemical activity degradation of the LSCF cathode materials of solid oxide fuel cells.
引用
收藏
页码：1821 / 1830
页数：10
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