【摘要】 以溶胶凝胶法合成了La0.8Sr0.2FeO3(LSF)粉体,用于中温固体氧化物燃料电池阴极材料。分别利用热分析(TG-DTG-DTA)、X射线衍射分析(XRD)、透射电镜(TEM)和交流阻抗谱仪(ACEIS)对粉体和阴极进行表征。结果表明,随着温度升高,经过粉体失水、硝酸盐分解等过程,在600℃已基本形成钙钛矿相,1000℃时为单一的钙钛矿相,煅烧4 h后的粒径约为80 nm。在800℃的阴极界面阻抗为0.12Ω.cm2。更多还原

【Abstract】 La0.8Sr0.2FeO3 powders were prepared by sol-gel method,which can be used as cathode material of intermediate temperature solid oxide fuel cell.The powders and cathode were characterized by thermogravimetry-differential coefficient thermogravimetry-differential thermal analysis(TG-DTG-DTA),X-ray diffraction(XRD),transmission electron microscopy(TEM) and AC electrochemical impedance spectroscopy(ACEIS) respectively.The results indicated that,with the increase of temperature,the powders lost water and nitrate decomposed.After this process,perovskite phase formed basically at 600 ℃,single perovskite phase formed at 1000 ℃ and the grain size was approximately 80 nm after calcination for 4 h.The interfacial impedance of cathode was 0.12 Ω·cm2 at 800 ℃.更多还原