采用EDTA-柠檬酸联合络合法制备La_0.5Sr_0.5Co_1-x-yFe_xCu_yO_3-δ系列阴极材料，利用X射线衍射、扫描电镜、直流四电极法对材料结构与性能进行研究。结果表明，不同组分阴极材料经1 000℃焙烧后均为纯钙钛矿相。阴极材料的致密性、结晶度和粒径随2种元素掺杂量的升高而增加，其中x=0.5时微观结构较优。在400~800℃范围内，La_0.5Sr_0.5Co_0.4Fe_0.5Cu_0.1O_3-δ材料电导率随温度升高先增大后减小，其他样品电导率均随温度升高而降低。Cu、Fe掺杂量增加使材料电导率减小，其中x=0.3、0.5时有所升高，但低于x=0时的数值；x=0.5、600℃时取得最大值596.421 S/cm。

A series of La_0.5Sr_0.5Co_1-x-yFe_xCu_yO_3-δ cathode materials are synthesized by EDTA-citric acid combined complexation method.The structure,cross section morphology and conductivity of the materials are studied by X-ray diffraction,scanning electron microscopy and four-probe DC method.It is shown that different compositions of cathode materials form a single perovskite phase after calcination at 1 000℃.As the doping ratio increases,the particle size of the cathode material increases,whose trend is similar to the compactness and crystallinity,especially the better microstructure of x=0.5 improving its electrical properties.In the test temperature range of 400-800℃,the conductivity of La_0.5Sr_0.5Co_0.4Fe_0.5Cu_0.1O_3-δ material increases first and decreases then with the increase of temperature,but that of other samples always decrease.And the increase of Cu and Fe doping proportions reduces the conductivity,where x=0.3 and 0.5 is the opposite,but it is still lower than that of x=0;The electrical conductivity reaches 596.421 S/cm at 600℃ when Fe doping ratio is x=0.5.

张帆(1994-),男,硕士研究生,研究方向为固体氧化物燃料电池阴极材料,869485478@qq.com