SOFC阴极材料LSM的合成及性能研究  

Performance of LSM Prepared by Different Methods

作　　者：张莉[1] 白耀辉[1] 刘江[1] 

机构地区：[1]华南理工大学化学与化工学院,广东省燃料电池技术重点实验室,广东广州510640

出　　处：《中国稀土学报》2013年第4期473-481,共9页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(x2hg-B5120590)资助

摘　　要：分别采用固相法、甘氨酸-硝酸盐燃烧法和溶胶-凝胶法制备了固体氧化物燃料电池阴极材料La0.8Sr0.2MnO3(LSM)。将合成的粉体在不同的温度下烧结,并通过XRD确定粉末成相最低烧结温度为900℃;利用扫描电镜(SEM)对合成的粉体进行微观结构的观察和分析;采用Van-der Pauw四电极法测量片状阴极的直流电阻进而计算电导率;采用三电极法研究LSM阴极材料的电化学性能;结果表明,溶胶-凝胶法制备的LSM阴极与电解质的界面阻抗最小。同时,将3种方法制备的LSM应用到多孔阳极支撑型的固体氧化物燃料电池上,制备成全电池,并采用四电极法对全电池的输出性能进行测试分析,结果表明,溶胶-凝胶法制备的LSM阴极材料电化学性能良好,最大输出功率密度达317mW.cm-2。因此,溶胶-凝胶法合成的LSM粉末能够有效满足固体氧化物燃料电池阴极材料的要求。La0.8Sr0.2MnO3（LSM） cathode powders were prepared by using solid-state reaction,glycine-nitrate process and sol-gel process,respectively.The powders were sintered at different temperatures and the perovskite phase formed at the lowest temperature was confirmed at 900 ℃ by XRD measurement.The microstructure of the powders was investigated by SEM.The electrical conductivity was calculated by measuring the resistance with Van-der Pauw method.The electrochemical performance of LSM was investigated by three-electrode method and the anode-supported SOFCs with LSM cathode was assembled and tested by four-probe setup.The results showed that the interfacial resistance of LSM cathode prepared by sol-gel process was the lowest,and the single cell with LSM cathode prepared by sol-gel process represented good performance with the maximum power density of 317 mW · cm-2 at 800 ℃,indicating that LSM powder made by sol-gel process is an available way to meet the requirement for cathode of SOFC.

关 键 词：固体氧化物燃料电池 LA0 8Sr0 2MnO3(LSM) 固相法 甘氨酸-硝酸盐燃烧法 溶胶-凝胶法 

分 类 号：TM911.4[电气工程—电力电子与电力传动]