Structure-dependent electrocatalytic activity of La_(1-x)SrxMnO_3 for oxygen reduction reaction  

作　　者：Guangjin Wang Tian Xu Sheng Wen Mu Pan 

机构地区：[1]College of Chemistry and Materials Science, Hubei Engineering University [2]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing [3]Wuhan University of Technology [4]Hubei Provincial Key Laboratory of Fuel Cell

出　　处：《Science China Chemistry》2015年第5期871-878,共8页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program of China(2012CB215504);the National High Technology Research and Development Program of China(2009AA034401);the National Natural Science Foundation of China(50632050)

摘　　要：The electrocatalytic activity toward oxygen reduction reaction is studied on the perovskite oxide La~_xbrxMnt）3, as preparea under different firing temperatures. X-ray diffraction shows that three different crystal phases featuring tetragonal, cubic, and orthorhombic symmetries form with increasing crystallinities. The electrocatalytic activity is characterized by cyclic voltam- metry and linear sweeping voltammetry for the three phases of La1-xSrxMnO3. We find that the tetragonal phase has the best catalytic activity among the three crystal phases, with the largest onset potential of 0.147 V. The synergistic effect between the volume per unit cell and crystallinity is indicated to account for the good catalytic activity of the tetragonal phase.The electrocatalytic activity toward oxygen reduction reaction is studied on the perovskite oxide La1?xSrxMn O3, as prepared under different firing temperatures. X-ray diffraction shows that three different crystal phases featuring tetragonal, cubic, and orthorhombic symmetries form with increasing crystallinities. The electrocatalytic activity is characterized by cyclic voltammetry and linear sweeping voltammetry for the three phases of La1?xSrxMn O3. We find that the tetragonal phase has the best catalytic activity among the three crystal phases, with the largest onset potential of 0.147 V. The synergistic effect between the volume per unit cell and crystallinity is indicated to account for the good catalytic activity of the tetragonal phase.

关 键 词：perovskite oxide LA1-XSRXMNO3 crystal phase CRYSTALLINITY oxygen reduction reaction 

分 类 号：O643.36[理学—物理化学]