阴极
氧化钇稳定氧化锆
材料科学
阳极
分析化学(期刊)
化学工程
化学
复合材料
电极
色谱法
立方氧化锆
工程类
陶瓷
物理化学
作者
Xin Yang,John S. Hardy,Christopher A. Coyle,Jeff F. Bonnett,Shant Mahserejian,Jeffry W. Stevenson
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2022-02-01
卷期号:169 (2): 024512-024512
被引量:4
标识
DOI:10.1149/1945-7111/ac4f6e
摘要
In-operando XRD was conducted on anode supported SOFC button cells with LSM-YSZ cathodes operated at varying cathode air compositions under constant current conditions for over 1000 h. 1-hour XRD scans were continuously collected throughout the entire operation duration. By taking the sum of measured intensities from all of the collected patterns, the resulting cumulative XRD count times allowed the identification of minor phases present at concentrations as low as <0.1 wt%. In dry air with no contaminants, the cathode exhibited improving power output during the first couple of hundred hours, followed by stable operation. The effect of 3% H 2 O + 12% CO 2 on the LSM-YSZ cathode was very similar to the effect of 3% H 2 O alone, exhibiting performance degradation. Increasing contaminants in the cathode air were found to decrease the performance of the cells. In-operando XRD discovered an increase in MnO concentration and decrease in La 2 O 3 . A gradual expansion of the LSM lattice resulting from loss of Sr or O was discovered in the LSM/YSZ cathodes tested in humid cathode air. The inverse relationship between the unit cell volume and operating voltage suggests a possible correlation between Sr segregation and performance degradation in the LSM/YSZ cathodes.
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