采用固相反应法合成了中温固体氧化物燃料电池阴极材料Pr2-xSrxCoO4+δ(x=0.8,1.0,1.2).通过XRD、SEM、热膨胀法、直流四探针法、交流阻抗谱法和循环伏安法对该体系材料的晶体结构、热膨胀系数、电导率和电化学性能进行了研究.结果表明,合成的粉体均形成了单相K2NiF4结构,Pr0.8Sr1.2CoO4+δ与电解质材料Sm0.2Ce0.8O1.9(SDC)在1100℃空气气氛下混合烧结,未生成杂相.材料的热膨胀系数随着Sr含量的增加而升高.800℃时样品的电导率均大于100 S/cm.随着Sr含量的增加,极化电阻减小,Pr0.8Sr1.2CoO4+δ在空气中的极化电阻最小,700℃为0.29 Ω·cm2.
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