催化学报 ›› 2015, Vol. 36 ›› Issue (4): 502-508.DOI: 10.1016/S1872-2067(14)60235-7

• 燃料电池电催化专栏 • 上一篇    下一篇

TiO2修饰La0.6Sr0.4Co0.2Fe0.8O3-δ用于中温固体氧化物燃料电池的阴极

刘伟星a,b, 赵哲a, 涂宝峰a, 崔大安a, 区定容a, 程谟杰a   

  1. a 中国科学院大连化学物理研究所洁净能源国家实验室(筹)燃料电池研究部, 辽宁大连 116023;
    b 中国科学院大学, 北京 100049
  • 收稿日期:2014-07-18 修回日期:2014-09-22 出版日期:2015-03-23 发布日期:2015-03-23
  • 通讯作者: Mojie Cheng
  • 基金资助:

    国家高技术研究发展计划(863计划, 2011AA050704); 国家重点基础研究发展计划(973计划, 2010CB732302, 2012CB215500); 国家自然科学基金(21376238, 21306189, 51101146).

TiO2-modified La0.6Sr0.4Co0.2Fe0.8O3-δ cathode for intermediate temperature solid oxide fuel cells

Weixing Liua,b, Zhe Zhaoa, Baofeng Tua, Daan Cuia, Dingrong Oua, Mojie Chenga   

  1. a Division of Fuel Cells, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-07-18 Revised:2014-09-22 Online:2015-03-23 Published:2015-03-23
  • Supported by:

    This work was supported by the National High Technology Research and Development Program of China (863 Program, 2011AA050704), the National Basic Research Program of China (973 Program, 2010CB732302, 2012CB215500), and the National Natural Science Foundation of China (21376238, 21306189, and 51101146).

摘要:

纳米TiO2修饰的La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF)阴极被直接应用于YSZ电解质电池上. TiO2可阻止LSCF和YSZ间的化学反应, 抑制SrZrO3的形成. LSCF-0.25 wt% TiO2阴极电池在0.7 V和600 ℃下的电流密度是LSCF阴极电池的1.6倍. 电化学阻抗谱结果表明, TiO2修饰显著加快了氧离子注入电解质的过程, 这可能与TiO2抑制了阴极/电解质界面处高电阻SrZrO3层的形成有关. 本文为在ZrO2基电解质上使用高性能的(La,Sr)(Co,Fe)O3阴极材料提供了一种简单有效的方法.

关键词: 中温固体氧化物燃料电池, 阴极, 二氧化钛, 界面反应, 氧化锆基电解质

Abstract:

A La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode modified using nanosized TiO2 was direct prepared on the yttria stabilized zirconia (YSZ) electrolyte in an intermediate temperature solid oxide fuel cell. TiO2 prevents reaction between LSCF and YSZ, which would have formed a SrZrO3 phase. The cell with a LSCF-0.25 wt% TiO2 cathode exhibited a current density that was 1.6 times larger than that with a pure LSCF cathode at 0.7 V and 600 ℃. Electrochemical impedance spectra showed the accelerated incorporation of oxygen anions into the YSZ electrolyte with the TiO2-modified LSCF cathode. The improvement was attributed to the suppressed formation of a non-conductive SrZrO3 layer at the cathode/electrolyte interface.

Key words: Intermediate temperature solid oxide fuel cell, Cathode, Titanium oxide, Interfacial reaction, Zirconia-based electrolyte