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OALib Journal期刊
ISSN: 2333-9721
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La0.8–xBaxSr0.2Co0.8Fe0.2O3–δ 阴极材料的结构与性能
DOI: 10.14062/j.issn.0454-5648.2015.11.02
Abstract:
采用溶胶–凝胶法制备了La0.8–xBaxSr0.2Co0.8Fe0.2O3–δ(LBSCF)阴极粉体。对LBSCF的晶体结构、材料表面的化学状态、烧结体的断面微结构及电导率进行了表征。用交流阻抗谱法在550~700℃范围测试了LBSCF-30%SDC(Sm0.2Ce0.8O1.9)复合阴极的电化学性能。结果表明LBSCF粉体主晶相为六方晶系钙钛矿结构，存在少量的第二相。XPS结果显示，Ba2+掺杂不影响A位离子(La3+、Ba2+、Sr2+)的价态，但对B位离子的价态有不同的影响x=0.10的样品中，钴离子以Co3+和Co4+混合价态存在，其余样品中以低氧化态(Co3+和Co2+混合价)或Co3+价存在；铁离子以高氧化态(Fe3+和Fe4+)存在。在500~700℃空气气氛中，LBSCF的电导率均超过700S/cm，在同一温度下，电导率随着Ba2+掺杂量的增加而增大。x=0.20的样品在500℃时，电导率最大可达1.59×103S/cm。随着Ba2+含量增加，极化电阻减小，x=0.20时，复合阴极LBSCF-30%SDC的极化电阻最小，700℃时的极化电阻为0.20Ω·cm2。
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