CoNi-PVP复合催化剂的制备及对乙醇电催化氧化性能研究

采用还原-高分子稳定剂(PVP)络合保护的方法制备用于催化乙醇氧化的纳米复合材料CoNi-PVP.通过红外光谱(IR)、透射电镜(TEM)、扫描电镜能谱(SEM-EDS)等技术对纳米复合催化材料进行表征.结果显示,得到的产物为Co,Ni纳米线,直径3～5 nm,长度约100 nm.利用循环伏安和计时电流法测试了其在碱性介质中对乙醇电化学氧化的催化能力.CoNi-PVP-C电极中的Co、Ni金属含量为2%,PVP∶CoNi物质量比为5∶1时,对乙醇的电化学氧化有最佳催化活性.

Preparation and Electrocatalytic Properties of CoNi-PVP Complex Catalysts for Ethanol Electro-oxidation

The synthesis of a composite electrocatalyst CoNi-PVP using polyvinylpyrrolidone (PVP) as protection agent was studied. The samples were characterized by IR, TEM, SEM-EDS measuremens. The results showed the samples were Co and Ni nanolines with the diameter ranged from 3 to 5 nm and the length 100 nm. The electrocatalytic activity of the CoNi-PVP electrode was investigated by cyclic voltammetry and chronopotentiography. The highest catalytic activity for oxidation of ethanol was found at the electrode with CoNi content of 2% and the mole ratio PVP:CoNi of 5:1.