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固体氧化物燃料电池Sr_2MgMoO_(6–δ)阳极材料制备及电导性能

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Abstract:

通过溶胶–凝胶热分解法制备了Sr2MgMoO6–δ(SMMO)阳极粉体。对粉体的物相和微观组织进行分析,研究了SMMO的烧结活性及烧结后在不同气氛中的电导率。结果表明1450℃烧结12h后,SMMO形成完整的双钙钛矿相;100MPa压力下的SMMO形成致密的陶瓷块体。能谱分析显示实验组分的摩尔比与理论值吻合。SMMO在空气气氛中的电导率较低,800℃的电导率为1.3×10–3S/cm,导电活化能为136.4kJ/mol;在H2气氛中的电导率大大增强,800?C的电导率为0.41S/cm,导电活化能降低到12kJ/mol,表现出很好的导电性。

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