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Degradation of LaSr sub(2)Fe sub(2)CrO sub(9-) delta solid oxide fuel cell anodes in phosphine-containing fuels

The performance and stability of La sub(0.9)Sr sub(0.1)Ga sub(0.8)Mg sub(0.2)O sub(3- delta )-electrolyte supported solid oxide fuel cells with composite LaSr sub(2)Fe sub(2)CrO sub(9- delta )-Gd sub(0.1)Ce sub(0.9)O sub(2) anodes were studied in wet H sub(2) and coal syngas containing phosphine imp...

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Bibliographic Details
Published in:Journal of power sources 2010-07, Vol.195 (13), p.4013-4021
Main Authors: Gong, Mingyang, Bierschenk, David, Haag, J, Poeppelmeier, K R, Barnett, Scott A, Xu, Chunchuan, Zondlo, John W, Liu, Xingbo
Format: Article
Language:English
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Summary:The performance and stability of La sub(0.9)Sr sub(0.1)Ga sub(0.8)Mg sub(0.2)O sub(3- delta )-electrolyte supported solid oxide fuel cells with composite LaSr sub(2)Fe sub(2)CrO sub(9- delta )-Gd sub(0.1)Ce sub(0.9)O sub(2) anodes were studied in wet H sub(2) and coal syngas containing phosphine impurity. Introduction of 5-20 ppm PH sub(3) into the fuels caused an initial slow cell performance degradation followed by a very rapid complete cell degradation that initiated within 11-24 h - earlier at higher PH sub(3) concentration. There was no recovery after removing PH sub(3) impurity from the fuels. Electrochemical impedance analysis suggested that the initial gradual performance degradation was due to conductivity loss of the oxide anode due to chemisorption and reaction of phosphine. X-ray diffraction analysis showed the formation of FeP sub()xand LaPO sub(4) compounds. The rapid degradation presumably occurred when most or all of the Fe initially present in the LaSr sub(2)Fe sub(2)CrO sub(9-) delta was consumed. Thermodynamic calculations confirmed that Fe is highly reactive with PH sub(3) at 800 degree C, even at concentrations below 1 ppm.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2009.12.117