双功能氧电极LaCo_(1-y)Mn_yO_3的合成及电化学性能  

Synthesis and electrochemical properties of LaCo_(1-y)Mn_yO_3 as bifunctional oxygen electrodes

作　　者：林生岭[1] 吴家建[1] 朱炜峰[1] 印厚飞[1] 曹旭[1] 陈传祥[1] 

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212003

出　　处：《江苏科技大学学报（自然科学版）》2010年第1期50-55,共6页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金(20704020);江苏科技大学博士启动基金(2006CL0035)

摘　　要：用甘氨酸硝酸盐燃烧法制备了复合氧化物LaCo1-yMnyO3（y=0-0.5,0.7,0.9）,并对它进行了XRD结构分析.用此复合氧化物制备了双功能氧电极,采用三电极体系在通氧或不通氧下测试氧还原和氧析出的循环伏安曲线,同时研究了氧电极的动力学特征,通过化学动力学参数得到氧还原和氧析出的活化能,采用恒电位电化学方法初步评价了该氧电极的电催化活性.结果表明：该复合氧化物粉体均为钙钛矿单相,平均粒径在14.2-20.2 nm之间.该氧电极具有双功能催化特性,但不完全可逆,其中LaCo0.7Mn0.3O3的双功能电催化活性最好.The glycine-nitrate combustion method was used to prepare complex oxide ceramic powders of LaCo1-yMnyO3（y=0～0.5,0.7,0.9）.Their structures and sizes were investigated by XRD.Bifunctional oxygen electrodes were made based on the complex powder.Furthermore,the cyclic volt-ampere curves of oxygen were obtained with and without flowing oxygen.The kinetics characteristics of oxygen electrodes were studied.According to the chemical dynamic parameter,activation energy of oxygen reduction and evolution was obtained.The result shows that the synthesized samples are single perovskite phase with the average particle size 14.2-20.2nm.The oxygen electrodes are not completely reversible and have bifunctional catalyst activity.The electrocatalysts of bifunctional oxygen electrode of LaCo1-yMnyO3 are excellent.

关 键 词：双功能氧电极 循环伏安 LaCo1-yMnyO3 甘氨酸硝酸盐燃烧法 

分 类 号：TM911.4[电气工程—电力电子与电力传动]