Structural and Chemical Evolution of the SOFC Anode La0.30Sr0.70Fe0.70Cr0.30O3-δ upon Reduction and Oxidation: An in Situ Neutron Diffraction Study

被引:46
作者
Haag, Jacob M. [1 ]
Barnett, Scott A. [2 ]
Richardson, James W., Jr. [3 ]
Poeppelmeier, Kenneth R. [1 ]
机构
[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA
[2] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[3] Argonne Natl Lab, Intense Pulsed Neutron Source, Argonne, IL 60439 USA
关键词
OXIDE FUEL-CELL; ELECTRICAL-CONDUCTIVITY; MAGNETIC-STRUCTURES; POWDER DIFFRACTION; PHASE-TRANSITION; TEMPERATURE; PEROVSKITES; ATMOSPHERE; STABILITY; KINETICS;
D O I
10.1021/cm100609e
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
Although some perovskite oxides have been shown to be stable solid oxide fuel cell (SOFC) anodes, the actual crystal structure of these materials under operating conditions is largely unknown. In this paper, the structural evolution or the SOFC anode La0.30Sr0.70Fe0.70Cr0.30O3-delta was studied at 800 and 900 degrees C (similar to SOFC operating temperatures) in progressively reducimg and oxidizing environments. The perovskite was shown to be stable down to a pO(2) of 10(-20) atm at 800 degrees C and a pO(2) of 10(-18) atm at 900 degrees C, at which point a spinel phase formed. Further reduction led to the formation of Fe metal. The phase separation of La0.30Sr0.70Fe0.70Cr0.30O3-delta was also shown to be completely reversible with an increase in the partial oxygen pressure and reoxidation of the sample.
引用
收藏
页码:3283 / 3289
页数:7
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