草酸在PPy-HEImTfa电极上的电催化性能及其机理  

Oxalic acid electro-oxidation on polypyrrole electrode prepared in 1-ethylimidazolium trifluoroacetate and its mechanism

作　　者：沈振陆[1] 李美超[1,2] 马淳安[1] 刘艳娜[1] 

机构地区：[1]浙江工业大学化学工程与材料学院、绿色化学合成技术国家重点实验室培育基地,浙江杭州310032 [2]浙江工业大学分析测试中心,浙江杭州310032

出　　处：《化工学报》2009年第4期918-922,共5页CIESC Journal

基　　金：浙江省自然科学基金项目(Y406381);浙江省分析测试科技计划项目(2008F70029)~~

摘　　要：以离子液体1-乙基咪唑三氟乙酸盐为介质,采用恒电流方法在铂电极表面合成了导电聚合物聚吡咯(PPy-HEImTfa)。与相同条件下在硫酸溶液中合成的聚吡咯(PPy-H2SO4)和铂电极相比,PPy-HEImTfa对草酸的电催化活性有了很大的改善。电化学原位红外光谱分析表明:在聚吡咯表面,草酸可经电氧化生成CO2,其氧化中间体主要是吸附态COOH;在高电位下,聚吡咯非常稳定,不易发生过氧化。Polypyrrole （PPy） was prepared galvanostatically in an ionic liquid 1-ethylimidazolium trifluoroacetate （HEIm Tfa）, and its electrocatalytic property for electro-oxidation of oxalic acid was investigated. As compared with PPy prepared in H2804 solution under the same conditions and platinum, the electrocatalytic activity of PPy-HEImTfa was greatly improved. In situ FTIR results showed that oxalic acid could be electro-oxidized to CO2 with an intermediate, adsorbed COOH. In addition, the polypyrrole was very stable and was not easy to be over-oxidized even at a high potential.

关 键 词：聚吡咯 1-乙基咪唑三氟乙酸盐 草酸 原位红外光谱 

分 类 号：O631.5[理学—高分子化学]