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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (5): 449-452. 上一篇    

研究简报

Pr1－xSrxAlO3－δ的合成及其作为固体氧化物燃料电池阴极的性能研究

徐加焕1，黄喜强1，吕喆1，张耀辉1，葛晓东1，苏文辉*,1,2,3   

  1. (1哈尔滨工业大学凝聚态科学与技术研究中心 哈尔滨 150001)
    (2吉林大学凝聚态物理系 吉林 130022)
    (3中国科学院国际材料物理中心 沈阳 110015)
  • 投稿日期:2005-06-24 修回日期:2005-11-03 发布日期:2006-03-15
  • 通讯作者: 苏文辉

Synthesis and Properties of Pr1－xSrxAlO3－δ as Cathode ofSolid Oxide Fuel Cells

XU Jia-Huan1, HUANG Xi-Qiang1, LÜ Zhe1, ZHANG Yao-Hui1, GE Xiao-Dong1, SU Wen-Hui*,1,2,3   

  1. (1 Center for Condensed Matter Science and Technology, Harbin Institute of Technology, Harbin 150001)
    (2 Department of Condensed Matter Physics, Jilin University, Changchun 130022)
    (3 International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015)
  • Received:2005-06-24 Revised:2005-11-03 Published:2006-03-15
  • Contact: SU Wen-Hui

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采用固相反应法合成了一系列样品Pr1－xSrxAlO3－δ (x＝0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5). XRD结果表明, Sr在A位上的固溶度约为20%; 利用交流阻抗法测量了样品的电导率, 结果表明, 电导率随着Sr掺入量的增加而增大, Pr0.8Sr0.2AlO3－δ的电导率最大, 在850 ℃达到0.02 S/cm; 离子迁移数的测试结果说明, Pr1－xSrxAlO3－δ为离子电子混合导体; 考察了它们作为固体氧化物燃料电池(SOFCs)阴极的性能, 极化曲线和阻抗的测试结果表明, 阴极性能随着Sr掺入量的增加而提高; 阴极稳定性测试结果表明, 在测量时间范围内, 阴极过电位随时间缓慢下降.

关键词: 阴极, 混合导电, 固体氧化物燃料电池

Compounds Pr1－xSrxAlO3－δ (x＝0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5) were successfully synthesized by solid state reaction method and XRD results showed that the solubility of Sr2＋ on A site was about 20%. The electrical conductivity measured by alternating current (AC) impedance was increased with increasing Sr content. The sample with x＝0.2 exhibited the best performance on the conductivity. At 850 ℃, the value was 0.02 S/cm. Results of ionic transfer number measurement indicated that the Pr1－xSrxAlO3－δ samples were the mixed ionic-electronic conductors. Both cathode polarization and AC impedance results showed that Sr2＋doping greatly improved the cathode performance. A short-term stability test of the cathode was done and the result showed that there was a slight decrease of the cathode over-potential during the test.

Key words: cathode, mixed conductor, solid oxide fuel cells