Electrical Properties of La0.8Sr0.2Co1-yFeyO3-δfor SOFC Cathodes
La<,0.8>Sr<,0.2>CO<,1-y>Fe<,y>O<,3-δ> (y=0.2, 0.4, 0.6, 0.8) powders were synthesized by ethylenediamine tetraacetic acid (EDTA) complexing sol-gel process. The powders were characterized via X-ray diffraction (XRD) and scanning electron microscope and energy dispersive X-ray spectroscopy (SEM-EDS). The results showed that single-phased perovskitetype oxide powders with small particle size were obtained by the process, and the compositions of the productions agreed with the designed molar ratio. The electronic conductivity and ionic conductivity of La <,0.8>Sr<,0.2>Co<,1-y>Fe<,y>O<,3-δ>were investigated by DC four-terminal method and AC impedance spectroscopy, respectively. The electronic conductivity of La<,0.8>Sr<,0.2>Co <,1-y>Fe<,y>O<,3-δ> is approximately 2~4 orders of magnitude higher than the ionic conductivity. It was confirmed that the conductivities of the materials were strongly influenced by the composition anions, temperature and sample preparing process.
La<,0.8>Sr<,0.2>Co<1-y>Fe<,y>O<,3-δ> cathode material solid oxide fuel cells electrical conductivity rare earths
Yu Jie(于洁) Ma Wenhui(马文会) Wang Hua(王华) Dai Yongnian(戴永年) He Tianchun(何天淳)
Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology/Nat Yunnan Provincial Department of Education, Kunming 650093, China
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
387-390
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）