摘要
采用固相反应法制备了Ba离子掺杂的La1-xBaxFeO3 (x = 0, 0.2, 0.35, 0.5, 0.65)系列阴极材料,研究了系列阴极材料的结构、热膨胀行为、电导率及催化活性等阴极工作特性。Ba元素掺杂阴极材料为立方钙钛矿结构,具有良好的稳定性,与电解质有良好的化学兼容性。La1-xBaxFeO3 (x = 0.2, 0.35)与电解质的热膨胀性能比较接近,热膨胀系数匹配良好。高温电导率测试结果表明随着Ba掺杂比例的提升电导率也随之增加,最大电导率为45.5 S•cm−1。La0.5Ba0.5FeO3在整个测试温度范围内拥有最优的ASR值(0.071 Ω cm2)。Ba元素的掺入对基体LaFeO3材料作为中温固体燃料电池阴极性能起到了积极促进作用,La0.5Ba0.5FeO3是该掺杂系列中综合性能最优异的材料,有望成为IT-SOFC阴极候选材料。
La1-xBaxFeO3 (x = 0, 0.2, 0.35, 0.5, 0.65) series cathode materials doped with Ba ions were prepared using solid-state reaction method. The structure, thermal expansion behavior, conductivity, and catalytic activity of the cathode materials were studied. The Ba element doped cathode ma-terial has a cubic perovskite structure, which has good stability and chemical compatibility with electrolytes. La1-xBaxFeO3 (x = 0.2, 0.35) is close to the thermal expansion performance of electrolyte, and the coefficient of thermal expansion matches well. The high-temperature conductivity test results indicate that the conductivity also increases with the increase of Ba doping ratio, with a maximum conductivity of 45.5 S•cm−1.La0.5Ba0.5FeO3 has the optimal ASR value (0.071 Ω cm2) throughout the entire testing temperature range. The doping of Ba element has a positive promot-ing effect on the cathode performance of LaFeO3 matrix material as a medium temperature solid fuel cell cathode. La0.5Ba0.5FeO3 is the most excellent material in this doping series and is expected to become a candidate material for IT-SOFC cathode.
出处
《材料科学》
2023年第5期369-378,共10页
Material Sciences
