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采用溶胶-凝胶法制备了电解质材料La1.9Ba0.1Mo1.9Al0.1O8.8(LBMA),通过热重-差示扫描量热分析(TGDSC)、X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)和电化学阻抗谱(EIS)等方法对样品进行测试研究。研究表明干凝胶经700℃煅烧处理即可得到立方相氧化物LBMA,煅烧后的粉体为分散性较好的球形纳米颗粒,平均粒径约为35 nm。SEM分析和致密度研究表明溶胶-凝胶法制备的粉体具有良好的烧结性能,在1100℃烧结2 h能得到相对密度高于98%的致密的陶瓷烧结体。电化学性能研究表明LBMA具有较高的离子电导率,1100℃烧结的LBMA电解质在800℃时电导率达到17.87 mS/cm,电导活化能为1.22 eV,其有望应用于中低温固体氧化物燃料电池。
The electrolyte La1.9Ba0.1Mo1.9Al0.1O8.8 (LBMA) was prepared by sol-gel method and characterized by TG-DSC, XRD and TEM ), Scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) and other methods of testing the sample. The results show that the xero-phase oxide LBMA can be obtained by the calcination of xerogel at 700 ℃. The calcined powders are spherical nanoparticles with good dispersity and the average particle size is about 35 nm. SEM analysis and density study show that the powders prepared by sol-gel method have good sintering properties. The dense ceramic sintered body with relative density above 98% can be obtained by sintering at 1100 ℃ for 2 h. The results of electrochemical properties show that LBMA has high ionic conductivity. The LBMA electrolyte sintered at 1100 ℃ has a conductivity of 17.87 mS / cm at 800 ℃ and an activation energy of 1.22 eV, which is expected to be applied to medium and low temperature solid oxide fuel cells .