La_(0.7)Sr_(0.3)MnO_3电化学特征及氧还原动力学研究  

Study on the electrochemical and kinetic characteristics of La_(0.7)Sr_(0.3)MnO_3

作　　者：徐甜[1] 汪广进[1] 余意[1] 程凤[1] 梁聪[1] 潘牧[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070

出　　处：《电池工业》2012年第6期365-370,共6页Chinese Battery Industry

基　　金：国家高技术研究发展计划重大项目(2009AA034400)

摘　　要：采用溶胶-凝胶法制备了La0.7Sr0.3MnO3催化剂粉体。通过XRD,CV和RDE等物化及电化学测试手段对制备催化剂的物相组成,电化学特征和氧还原催化活性进行了研究。XRD结果分析表明制备催化剂具有的单一物相组成,且平均颗粒粒径大约为60.5nm。电化学测试结果表明La0.7Sr0.3MnO3具有良好的氧还原催化活性,其氧还原起始电势可达到0.025V(vs.Hg/HgO)。La0.7Sr0.3MnO3的ORR催化过程属于混合的二电子和四电子转移过程,但以生成产物为水的四电子转移过程为主。La0.7 Sr0.3 MnO3 catalyst powder is prepared by sol-gel method. X-ray diffraction, cyclic voltammetry and rotating disk electrode techniques are employed to characterize the phase com- posite, the electrochemical feature and the oxygen reduction catalytic activity of the synthesized catalyst powder. The result of XRD shows that the catalyst podwer is a single phase composite and the average particle size of catalyst is about 60. 5 nm. The electrochemical measurements dis- play La0.7 Sr0.3 MnO3 catalyst exhibit excellent catalytic activity for ORR in alkaline electrolyte. It＇s onset potential for ORR is about 0. 025V （vs. Hg/HgO）. The ORR catalyzed by La0.7 Sr0.3 MnO3 is a mixture of 2- and 4-electron transfer pathways, dominated by a 4-electron transfer process.

关 键 词：钙钛矿 LA0 7Sr0 3MnO3 氧还原反应 溶胶-凝胶法 

分 类 号：TM911.4[电气工程—电力电子与电力传动]