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A位Ba~(2+)缺位和B位Cu~(2+)掺杂对中温SOFC阴极材料PrBaCo_2O_(6-δ)结构与性能的影响

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Indexed by:会议论文

Date of Publication:2016-07-01

Page Number:1

Key Words:SOFC阴极;Ba~(2+)缺位;Cu~(2+)掺杂;极化阻抗;热膨胀系数

Abstract:固体氧化物燃料电池(SOFC)是新型、高效绿色能源,阴极是决定中温SOFC性能的关键组元材料。本文以层状钙钛矿结构氧化物阴极材料PrBaCo_2O_(6-δ)(PBCO)为研究对象,通过引入A位Ba~(2+)缺位和进行B位Cu~(2+)掺杂两种方式,进行PBCO阴极性能优化探索研究。X射线衍射测试结果表明:Ba~(2+)缺位和Cu~(2+)掺杂均未改变PBCO的相结构,但A位Ba~(2+)缺位使PBCO晶格收缩而B位Cu~(2+)掺杂使其晶格膨胀;随A位Ba~(2+)缺位量增大(x=0,0.03,0.05,0.08),PBCO电导率先减小后增大,而50%B位Cu~(2+)掺杂使电导率减小;随A位Ba~(2+)缺位量增大,PBCO的氧还原催化活性显著增强,600度下极化阻抗由0.181Ωcm~2降低至0.093Ωcm~2,降低48.6%,但热膨胀系数(TEC)变化不大;而50%B位Cu~(2+)掺杂虽然使PBCO的极化阻抗稍有增大,但使TEC值降低~20%,SOFC的结构与性能稳定性得到提高。通过对氧含量和化学缺陷的表征分析,探讨了Ba~(2+)缺位和Cu~(2+)掺杂对PBCO阴极结构与性能的影响机制。

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