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《Journal of Materials Science and Engineering》 2005-06
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Electrical Properties of La_(0.6)Sr_(0.4)Co_(1-y)Fe_yO_3 Cathode Materials

JIANG Jin-guo,CUI Chong,CHEN Guang(Department of Materials Science and Engineering,Nanjing University of Science & Technology,Nanjing 210094,China)  
La_(1-x)Sr_xCo_(1-y)Fe_yO_3(LSCF) perovskite-type oxide is a wonderful electronic-ionic combine conductor and possesses,the characteristic of good chemical stability and catalyze activity,which can be used as a potential candidate for the cathode materials of Solid Oxide Fuel Cell(SOFC).In this paper,the electrical conduction mechanism of La_(0.6)Sr_(0.4)Co_(1-y)Fe_yO_3(y=0.2~0.8) cathode materials was studied.Analyses indicate that the electrical conduction appears to occur via a small-polaron hopping mechanism,In addition,the XPS results show that the other three factors: 1) the thermally activated disproportionation of Co~(3+) ions into Co~(2+) and Co~(4+) pairs;2) the ionic compensation of oxygen vacancies formed at high temperatures;3) Fe~(4+) ions electronic compensation preferential to Co~(4+),contribute to electrical conduction too.
【Fund】: 南京理工大学科研发展基金资助项目(AB96055)
【CateGory Index】: TM911.4;
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