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Pr1-x(La0.37Ce0.63)xCoO 3的制备及催化活性探究 预览

Preparation and Exploration of Catalytic Activity of Pr1-x(La0.37Ce0.63)xCoO3
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摘要 采用溶胶-凝胶法制备了Pr1-x(La0.37Ce0.63)xCoO3,利用TG-DSC、FT-IR分析前驱体的分解特性和化学键变化规律,结合XRD、SEM-EDS检测粉体微观结构、形貌以及元素分布;通过CV、LSV和RRDE技术探讨粉体在碱性溶液中氧还原ORR电催化活性。结果表明,在700℃下焙烧,x<0.4时,有La2O3、CeO2杂相出现,x>0.4时钙钛矿晶体结构消失,x=0.4时得到的纯相粉体呈多孔结构。与商用Pt/C相比,Pr1-x(La0.37Ce0.63)xCoO3粉体质量活性(质量比电流)是其1.7倍,达到172.54mA/mg,而半波电位较低仅为0.60V(vs.RHE)。以二电子发生氧化还原反应过程中,副产物H2O2产率为77%,作为催化材料有待进一步改性。 Pr1-x(La0.37Ce0.63)xCoO3 was prepared by sol-gel method.Decomposition characteristics of dry gel precursors were investigated by TG-DSC and changes of chemical bonds of heat treatment were analyzed by FT-IR.Microstructure, morphology and element distribution of prepared powders were determined by XRD and SEM-EDS.Electro-catalytic activity of powders for oxygen reduction reaction ORR in alkali solution were investigated by CV, LSV and RRDE techniques.The results show that when calcined at 700 ℃, x <0.4, impurity of La2O3 and CeO2 appear, perovskite crystal structures disappear when x >0.4, and pure phase powder is porous when x =0.4.Mass activity (current density) of Pr1-x(La 0.37 Ce 0.63)xCoO3 powder is 172.54 mA/mg, 1.7 times higher than that of commercial Pt/C, but half-wave potential is only 0.60 V ( vs .RHE).It is a two-electron process in oxygen reduction reaction, and yield of by-product H2O2 is 77%.It can be further enhanced as catalyst material.
作者 许林成 郝占忠 李钒 XU Lin-cheng;HAO Zhan-zhong;LI Fan(School of Chemistry, Baotou Teachers College, Baotou 014030, Inner Mongolia, China;College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)
出处 《有色金属:冶炼部分》 CAS 北大核心 2019年第5期63-68,共6页 Nonferrous Metals(Extractive Metallurgy)
基金 内蒙古自治区自然科学基金项目(2015MS0516) 包头师范学院阴山学者培养计划项目(01135005/047)。
关键词 溶胶-凝胶法 Pr1-x(La0.37Ce0.63)xCoO3粉体 制备 催化活性 sol-gel method Pr1-x(La0.37Ce0.63)xCoO3 powder preparation catalytic activity
作者简介 许林成(1993-),男,河南南阳人,硕士研究生;通信作者:郝占忠(1963-),男,陕西府谷人,博士,教授.
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