高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (5): 791.

• 研究论文 • 上一篇    下一篇

锰酸镧和氧化钇稳定的氧化锆复合阴极的研究

卢自桂, 江义, 董永来, 张义煌, 阎景旺   

  1. 中国科学院大连化学物理研究所, 大连 116023
  • 收稿日期:1999-08-02 出版日期:2001-05-24 发布日期:2001-05-24
  • 通讯作者: 江　义(1963年出生),男,研究员,博士生导师,从事燃料电池研究.
  • 基金资助:

    国家自然科学杰出青年科学基金(批准号:29825113)资助

A Study of LSM-YSZ Composite Cathodes by AC Impedance and Polarization

LU Zi-Gui, JIANG Yi, DONG Yong-Lai, ZHANG Yi-Huang, YAN Jing-Wang   

  1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
  • Received:1999-08-02 Online:2001-05-24 Published:2001-05-24

PDF (PC)

被引次数

91

摘要： 用交流阻抗,强极化和电导测量等方法考察了一系列不同氧化钇稳定氧化锆(YSZ)含量的锶掺杂锰酸镧(LSM)复合阴极的电化学性能,发现随着掺入YSZ量的增大,阴极性能大幅度提高,当YSZ质量分数为40%时,电极性能最好,电化学极化电阻约为1.18Ω/cm2.通过分析发现,YSZ的掺杂使电极反应过程的控制步骤发生了变化.同时发现,随着YSZ含量的增加,电极的接触电阻增大.以Pt为电流收集层和40%的YSZ+LSM的复合电极形成的二层电极可有效地消除接触电阻,进一步提高了复合电极的性能.在1223K极化电阻从1.18Ω/cm2下降到0.41Ω/cm2.

关键词: 固体氧化物燃料电池, 复合锰酸镧阴极, YSZ电解质

Abstract: Aseries of composite cathodes with various YSZadditions were investigated by ACimpedance, polarization and conductivity measurement. The electrochemical performance of the cathodes was improved by increasing the YSZaddition, and the optimal YSZaddition for the lowest electrode resistance(1.18 Ω/cm2) was found to be 40%. The rate determining step of the cathode reaction varied when YSZwas added into the LSMelectrode. The contact resistance increased as YSZaddition increased. By applying a layer of platinum on the cathode as a current collecting layer, the contact resistance decreased significantly, and the electrode resistance at1223 Kdropped remarkably from 1.18 Ω/cm2 to 0.41 Ω/cm2.

Key words: Solid oxide fuel cell, Composite La(MnO4)3 cathode, YSZ electrolyte

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