摘要
用溶胶-凝胶法制备了钙钛矿型氧化物Nd0.6Ca0.4MnO3,以X射线衍射分析(XRD)、扫描电镜(SEM)、热重-差热(TG-DSC)手段对产物进行了分析和表征。结果表明:在一定实验条件下制备的氧化物纯度高,粒径小,结构稳定。以该氧化物为催化剂,制备了应用于碱性介质中氧还原反应的气体扩散氧电极,用极化曲线和交流阻抗方法测试和研究了其电化学性能。结果显示:制备的Nd0.6Ca0.4MnO3对氧还原具有优良的催化性能,-0.2V(vs.HgO/Hg)下,电极电流密度在静止的空气和氧气气氛环境中分别达到-82mA/cm2和-142mA/cm2,制备时柠檬酸的配比对其催化的性能有显著影响。
The perovskite-type Nd0.6Ca0.4MnO3 was prepared by sol-gel method, and the products were characterized by XRD, SEM and TG-DSC. The results show that perovskite Nd0.6Ca0.4MnO3 has steady structure, smaller particle size and high purity. The gas diffusion electrode used for ORR in alkaline medium was prepared with Nd0.6Ca0.4MnO3 as catalyst. The electrochemical properties were characterized by linear sweep voltammetry and EIS, and the results indicate that the products exhibit a remarkable catalytic activity for oxygen reduction. The test results by LSV curves reveal that when the current density reaches -82 mA/ cm2 in the air and -142 mA/cm2 in the oxygen at -0.2 V （vs. Hg/HgO）, the electrocatalystic properties are signally influenced by the proportion of citric acid.
出处
《电源技术》
CAS
CSCD
北大核心
2010年第1期24-27,共4页
Chinese Journal of Power Sources
