摘要
采用溶胶 凝胶法合成了中温固体氧化物燃料电池阴极材料La0 .8Sr0 .2 Co0 .5Fe0 .5O3 (LSCF)粉体 .用热重分析 (TG)、差热分析 (DTA)、X射线衍射分析 (XRD)、扫描电镜 (SEM )、透射电镜 (TEM )、傅里叶红外 (FT IR)、BET和元素分析仪对热分解机理和粉体的性质进行了研究 .结果表明 ,随着温度的不断升高 ,凝胶先经过失水过程 ,然后发生有机物和部分硝酸盐的分解及碳酸盐的生成 ,5 0 0℃时开始形成钙钛矿相 ,6 0 0℃时硝酸盐完全分解 ,80 0℃时残余的碳酸盐完全分解并形成单相的钙钛矿晶型结构 ;在 80 0℃焙烧 2h ,粉体的平均粒径为 34.2nm ,比表面积为 2 8.2m2 / g .
La 0.8 Sr 0.2 Co 0.5 Fe 0.5 O 3(LSCF) nanometer powder for IT sofc′s cathode was prepared by sol gel method. The property and process of perovskite phase in LSCF material was investigated by thermogravimetric analysis(TG), differential thermal analysis(DTA), X Ray diffraction (XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), Fourier transformation infrared spectroscopy(FT IR), BET and element analyser. It has been found that water was removed first, then followed citric acid and nitrates decomposition processes and carbonates formation processes; LSCF phase began to form at 500?℃, nitrate ions decomposed completely at 600?℃ and the single phase of LSCF perovskite is obtained at 800?℃, typical mean particle diameters and specific surface are 34.2?nm and 28.2?m 2/ g respectively, when powders sintered at 800?℃ for 2?h.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第1期81-83,共3页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家高技术研究发展计划资助项目 (2 0 0 1AA32 30 90 ) .
