中文摘要：

采用EDTA-柠檬酸法合成了中温固体氧化物燃料电池阴极材料Sr1.5La0.5Mn1-xCoxO4（SLMCOx），并利用粉末X射线衍射（XRD）、X射线光电子能谱（XPS）以及电化学交流阻抗谱（EIS）进行表征。结果表明，该材料与Ce0.9Gd0.1O1.95（CGO）在1 200℃烧结12 h不发生化学反应。随着Co掺入量的增加，氧化物中Mn3和Co2含量增多，晶格氧含量降低，晶格畸变率增大。交流阻抗谱（EIS）测试结果显示，钴的掺杂明显降低电极的极化电阻，其中Sr1.5La0.5Mn0.7Co0.3O4阴极在700℃空气中的极化电阻为0.62 Ωcm2，明显小于Sr1.5La0.5MnO4阴极在750℃的极化电阻（1.5 Ωcm2），表明钴掺杂的Sr1.5La0.5Mn1-xCoxO4是一种潜在的IT-SOFC阴极材料。

英文摘要：

Sr1.5La0.5Mn1-xCoxO4 （SLMCOx） cathode materials for IT-SOFCs （intermediate temperature solid oxide fuel cells） were synthesized by EDTA-citric acid method and characterized by XRD, XPS and EIS, respectively. The results show that SLMCOx has no reaction with Ce0.9Gd0.1O1.95 at 1 200℃ for 12 h. Both the amount of Mn3 and Co2 in the oxide increase with the Co doping concentration; at the same time the content of lattice oxygen reduces, and the distortion ratio （c/a） of the lattice increases. The EIS results show that Co-doping dramatically reduces the polarization resistance （Rp） of SLMCOx cathode. The Sr1.5La0.5Mn0.7Co0.3O4 has the lowest Rp of 0.62 Ωcm2 at 700℃ in air, which is clearly smaller than the Rp value of Sr1.5La0.5Mn0.7O4 that measured at 750℃ （1.5 Ωcm2）. Our results indicate that the Co doped Sr1.5La0.5Mn1-xCoxO4 is potential cathode material for IT-SOFC.