Effect of stoichiometry on (La0.6Sr0.4)xCo0.2Fe0.8O3 cathode evolution in solid oxide fuel cells

被引：9
作者：
Lu, Kathy [1 ]
Shen, Fengyu [1 ]
机构：
[1] Virginia Tech, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
来源：
JOURNAL OF POWER SOURCES | 2014年 / 267卷
关键词：
Solid oxide fuel cell; LSCF cathode; Cathode degradation; Chromium diffusion; Stoichiometry; Interfacial interaction; DOPED LAMNO3 ELECTRODES; THERMOCHEMICAL STABILITY; ELECTRICAL-PROPERTIES; AIR ELECTRODE; ALLOY; DEGRADATION; DEPOSITION; CR; INTERCONNECT; MECHANISM;
D O I：
10.1016/j.jpowsour.2014.05.114
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：
Cathode degradation is a major issue for solid oxide fuel cells servicing under severe high temperature environments. This work studies the effect of stoichiometry on (La0.6Sr0.4)(x)Co0.2Fe0.8O3 (LSCF) cathode evolution at 800 degrees C by investigating the interfacial reaction and degradation through an AISI 441 interconnect/LSCF electrode/yttria-stabilized zirconia (YSZ) electrolyte half-cell structure under an electric load. Detailed high resolution composition analysis shows that Sr, Co, Fe, and Cr distributions vary with stoichiometry after the thermal treatment. Electron diffraction shows that the new phases are CoFe2O4 and amorphous Cr-oxide for LSCF95, SrCrO4 and CoFeO4 for LSCF100, and CoFe2O4 and CoCr2O4 for LSCF105. Based on the elemental distribution and phase analysis, the evolution of the LSCF electrodes and the interaction mechanisms between the LSCF electrodes and the AISI 441 alloy are proposed. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：421 / 429
页数：9
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