物理化学学报 >> 2007, Vol. 23 >> Issue (02): 232-236.doi: 10.3866/PKU.WHXB20070218

研究论文 上一篇    下一篇

纳米La0.6Sr0.4Co0.2Fe0.8O3-δ阴极粉体的溶液燃烧法合成与性能表征

雷泽;朱庆山   

  1. 中国科学院过程工程研究所, 多相反应重点实验室, 北京 100080;中国科学院研究生院, 北京 100049
  • 收稿日期:2006-07-14 修回日期:2006-10-25 发布日期:2007-02-01
  • 通讯作者: 朱庆山 E-mail:qszhu@home.ipe.ac.cn

Solution Combustion Synthesis and Characterization of Nanocrystalline La0.6Sr0.4Co0.2Fe0.8O3-δ Cathode Powders

LEI Ze;ZHU Qing-Shan   

  1. Key Laboratory of Multiphase Reactions, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, P. R. China;Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2006-07-14 Revised:2006-10-25 Published:2007-02-01
  • Contact: ZHU Qing-Shan E-mail:qszhu@home.ipe.ac.cn

摘要: 采用硝酸盐-甘氨酸溶液燃烧法合成了La0.6Sr0.4Co0.2Fe0.8O3-?啄(LSCF)前驱粉体, 通过XRD、BET、FESEM及激光粒度仪等手段对粉体进行表征. 结果表明, 所合成的LSCF粉体为纯钙钛矿结构, 具有高达22.9 m2·g-1的比表面积, 粒度均匀, 平均颗粒尺寸为175 nm. 非等温烧结实验表明该粉体具有良好的低温烧结活性. 在阳极NiO-YSZ(氧化钇稳定氧化锆)负载的电解质YSZ上, 于800 ℃烧结制备LSCF阴极组成的单元电池Ni-YSZ/YSZ/LSCF, 在700 ℃下以H2作燃料时具有良好的电池性能, 最大功率密度为0.97 W·cm-2, 在0.7 V时的功率密度约达到0.83 W·cm-2. 这种无中间缓冲层的低温制备LSCF阴极方法, 简化了电池结构及其制备过程, 同时提高了电池的性能.

关键词: LSCF, 阴极, YSZ, 固体氧化物燃料电池, 溶液燃烧法

Abstract: La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) precursor powder was prepared by a nitrate-glycine solution combustion method. The properties of LSCF powder were characterized by XRD, BET, FESEM, and dynamic laser scattering (DLS) method. The results showed that LSCF powder was in the perovskite structure with a specific surface area of 22.9 m2·g-1 and an average particle size of 175 nm. The results of non-isothermal sintering tests suggested that LSCF powder possessed good low-temperature sintering activity. The cell Ni-YSZ/YSZ/LSCF(YSZ: yttria stabilized zirconia) with the cathode sintered at 800 ℃ for 2 h demonstrated excellent generation performance with the maximum power density of 0.97 W·cm-2 and the power density of 0.83 W·cm-2 at 0.7 V under operation at 700 ℃. Low temperature processing of the interlayer-free LSCF cathode was beneficial to simplify the cell structure and manufacturing process and to improve the cell performance.

Key words: LSCF, Cathode, YSZ, Solid oxide fuel cell (SOFC), Solution combustion method