Sm0.5Sr0.5CoO3 cathodes for low-temperature SOFCs

被引：611

作者：

Xia, CR ^{[1
]}

Rauch, W ^{[1
]}

Chen, FL ^{[1
]}

Liu, ML ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

来源：

SOLID STATE IONICS | 2002年 / 149卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

solid oxide fuel cells; low-temperature SOFC; strontium-doped samarium cobaltite; interfacial resistance; cathode;

D O I：

10.1016/S0167-2738(02)00131-5

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：

The electrochemical properties of the interfaces between an SM0.2Ce0.8O1.9 (samaria-doped ceria, SDC) electrolyte and porous composite cathodes consisting of Sm0.5Sr0.5CoO3 (SSC) and SDC have been investigated in anode-supported single cells at low temperatures (400-600 degreesC). The bilayer structures of the SDC electrolyte films (25 mum thick) and the NiO-SDC anode supports were formed by co-pressing and subsequent co-firing at 1350 degreesC for 5 h. The effect of composition, firing temperature, and microstructure of the composite cathodes on the electrochemical properties is systematically studied. Results indicate that the optimum firing temperature is about 950 degreesC, whereas the optimum content of SDC electrolyte in the composite cathodes is about 30 wt.%. It is noted that the addition of the proper amount of SDC to SSC dramatically improved the catalytic properties of the interfaces; reducing the interfacial resistance by more than one order of magnitude compared with an SSC cathode without SDC. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：11 / 19

页数：9

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