Pr_(1-x)Sr_xAlO_(3-δ)的合成及其作为固体氧化物燃料电池阴极的性能研究  

Synthesis and Properties of Pr_(1-x)Sr_xAlO_(3-δ) as Cathode of Solid Oxide Fuel Cells

作　　者：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] 

机构地区：[1]哈尔滨工业大学凝聚态科学与技术研究中心 [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

出　　处：《化学学报》2006年第5期449-452,共4页Acta Chimica Sinica

摘　　要：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0.02S/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.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 Sr^2＋ 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 Sr^2＋ 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.

关 键 词：阴极 混合导电 固体氧化物燃料电池 

分 类 号：TM911.4[电气工程—电力电子与电力传动]