Influence of electrolyte surface planarization on the performance of the porous SOFC cathodes

被引：10

作者：

Dunyushkina, LA ^{[1
]}

Adler, SB

机构：

[1] Univ Washington, Dept Chem Engn, Seattle, WA 98195 USA

[2] Russian Acad Sci, Inst High Temp Electrochem, Ekaterinburg 620219, Russia

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2005年 / 152卷 / 10期

关键词：

D O I：

10.1149/1.2032448

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electrochemical characteristics of porous Pt and La0.8Sr0.2CoO3-delta (LSC) electrodes has been found to depend strongly on polishing of the underlying Ce0.8Sm0.2O2-delta (SDC) electrolyte using SiC and/or diamond prior to cell fabrication. The effect of surface treatment on the microstructure and composition of SDC was investigated using scanning electron microscopy and electron spectroscopy for chemical analysis. After high-temperature sintering, the surface of SDC is Sm-enriched and has granular morphology; grinding or polishing removes this grained layer and leads to a decrease in Sm concentration. Refiring of the polished electrolyte at 1450-1650 degrees C results in restoration of the grain structure and Sm composition on the surface. It was found using electrochemical impedance spectroscopy that the surface treatment most strongly influences the high-frequency component of the impedance, suggesting the changes are associated primarily with an interfacial resistance. (c) 2005 The Electrochemical Society.

引用

页码：A2040 / A2045

页数：6

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