On the interaction of SSC and LSGM in composite SOFC electrodes

被引:20
作者
Duong, Anh T. [1 ,2 ]
Mumm, Daniel R. [1 ,2 ]
机构
[1] Univ Calif Irvine, Irvine, CA 92697 USA
[2] Univ Calif Irvine, Natl Fuel Cell Res Ctr, Irvine, CA 92697 USA
基金
美国国家科学基金会;
关键词
Solid oxide fuel cells; Cathodes; Inter-diffusion; Polarization; Electrode degradation; OXIDE FUEL-CELLS; CHEMICAL COMPATIBILITY; CATHODES; ZIRCONIA; LAMNO3;
D O I
10.1016/j.jpowsour.2013.04.046
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
Composites of Sm0.5Sr0.5CoO3-delta (SSC), a good electronic conductor, and La0.8Sr0.2Ga0.8Mg0.2O3-delta (LSGM), a good ionic conductor, have been evaluated as cathode systems for La-gallate electrolyte based SOFC systems via microstructural analysis and electrochemical testing. SSC and LSGM composite cathode half-cells were fabricated with varying phase fraction ratios. X-ray diffraction and transmission electron microscopy studies show that these electrode and electrolyte materials will inter-diffuse with long-term exposure in service environments. Within an electrode, inter-diffusion occurs between SSC and LSGM particles of varying initial particle sizes, resulting in heterogeneity in the local cation ratios. Of the SSC/LSGM weight ratios analyzed (pure SSC, 80:20, 70:30, and 50:50), the 80:20 ratio was identified to possess the lowest resistance, according to AC impedance results. The microstructural basis of this finding, and implications for optimal materials design, are discussed. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:281 / 287
页数:7
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