【摘要】 La_1-xSr_xCo_1-yFe_yO₃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La_0．6Sr_0．4Co_0．8Fe_0．2O₃（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℃,所合成的粉末具有单一的钙钛矿结构,平均粒径约为40 nm；掺杂后的LSCF仍保持菱方结构；当SOFC的运行温度低于800℃时,LSCF与YSZ具有良好的化学相容性。更多还原

【Abstract】 La_1-xSr_xCo_1-yFe_yO₃ perovskite-type composite oxides are won- derful electronic-ionic conductor,which makes them be potential cath- ode materials for ITSOFC.La_0.6Sr_0.4Co_0.8Fe_0.2O₃（LSCF） powder was syn- thesized by EDTA-citric acid method.The synthesis of the per- ovskite-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 re- sults were as follows:free powder of LSCF with an average particle size of～40nm was prepared by EDTA-citric acid method.The optimum cal- cining temperature was 800℃.After doping,the LSCF phase remained rhombohedral structure.When the operation temperature of SOFC was below 800℃,LSCF worked fine with YSZ electrolyte.更多还原