Nd0.6Ca0.4MnO3的制备及电化学性能研究.pdf

里望煎至团E譬删 Ndo．6Cao．4Mn03的制备及电化学性能研究 程翔，周德璧，黄玉，齐 巍 (中南大学化学化工学院，湖南长沙410083) 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 V 究了其电化学性能。结果显示：制备的Ndo日caoJdn03对氧还原具有优良的催化性能，一0．2I 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--82mNcrn2和一142mNcnl2-，制备时柠檬酸的配比对其催化的 性能有显著影响。 关键词：钙钛矿型氧化物；氧还原；溶胶凝胶 911 中图分类号：TM 文献标识码：A 文章编号：1002埘7 X(2010)01-002伽4 andelectrochemicalof Ndo．6Cao．4]VIn03 Preparation properties CHENG Wei Xiang，ZHOUDe—bi，HUANGYu，QI rInstitute andChemical South Hunan ofChemistry University,Changsha410083，China) Engineering,Ccntral the charactedzed Abstract：111e was method。and were perovskite-typeNdo．6ca0朋n03preparedbysol-gel products TG—DSC．Theresultsthat has XRD。SEMand show structure，smaller by perovskiteNdo．矗an4Mn03steady particle and diffusionelectrodeusedforORRinalkalinemediumwas with size Ndn6Can4^一n03 highpurity．111egas prepared as electrochemicaIwerechamctenzedIinear andEIS．andtheresuIts voltammetry catalyst．The properties by sweep indicatethatthe exhibRaremarkable for reduction．ThetestresuItsLSVcurves products