摘要：La_0．6Sr_0．4Co_0．8Fe_0．2O₃ 钙钛矿型氧化物具有良好的电子和离子混合导电性能,可作为中温固体氧化物燃料电池(ITSOFC)的阴极材料。本文中采用EDTA-柠檬酸法合成Lag&Sra.CosFeo2O3(LSCF)粉末,借助差热-热重(DTA/TG)、X射线衍射(XRD)、扫描电镜(SEM)等分析手段,对阴极材料的合成、掺杂机理、与电解质(YSZ)间的高温化学相容性进行了研究和讨论:结果表明:干凝胶的最佳煅烧温度为800心,所合成的粉末具有单一的钙钛矿结构,平均粒径约为40nm;掺杂后的LSCF仍保持菱方结构;当SOFC的运行温度低于800 C时,LSCF与YSZ具有良好的化学相容性

关键词:燃料电池;阴极材料;掺杂;化学相容

Abstract:La_0．6Sr_0．4Co_0．8Fe_0．2O₃perovskite-type composite oxides are wonderful electronic-ionic conductor，which makes them be potential cathode materials for ITSOFC. LasSr, Co,sFen2O;(LSCF) powder was synthesized by EDTA-citric acid method.The synthesis of the perovskite-type cathode materials and their mechanisms of doping were discussed besides chemical compatibility with YSZ electrolyte at high temperatures in oxidation atmosphere，by means of DTA/TG，X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results were as follows: fine powder of LSCF with an average particle size of ~40nm was prepared by EDTA-citric acid method. The optimum calcining temperature was 800C. After doping, the LSCF phase remained rhombohedral structure. When the operation temperature of SOFC was below 800 C, LSCF worked fine with YSZ electrolytc.

Keywords: solid oxide fuel cell (SOFC); cathode: doping; chemical compatibility