二甲醚在铂电极上的电氧化和吸附行为  

Dimethyl-Ether Electro-Oxidation and Adsorption at Pt Electrode

作　　者：邵玉艳[1] 尹鸽平[1] 高云智[1] 

机构地区：[1]哈尔滨工业大学应用化学系,黑龙江哈尔滨150001

出　　处：《武汉大学学报（理学版）》2004年第4期436-440,共5页Journal of Wuhan University:Natural Science Edition

基　　金：黑龙江省自然科学基金(B0201);哈尔滨工业大学科研基金(HIT.2001.39)资助项目

摘　　要：运用循环伏安法和气相色谱法研究了二甲醚在铂电极上的电氧化和吸附行为,并与甲醇进行了比较.二甲醚的循环伏安曲线显示在0.8V(vs.RHE)附近出现两个氧化峰.二甲醚在铂电极上的吸附强度弱于氧、甲醇甚至氢.二甲醚电氧化的起始电位较甲醇低50mV,峰值电位较甲醇低约110mV.气相色谱研究表明二甲醚电氧化过程中有少量甲醛生成.基于电化学和气相色谱研究结果,提出了二甲醚在铂电极上电氧化的反应机理,并认为二甲醚电氧化过程可以有多种途径.Dimethyl-ether (DME) electro-oxidation and adsorption at Pt electrode was investigated by cyclic voltammetry (CV) and gas chromatograph (GC). CV showed that there were two current peaks of DME electro-oxidation at potentials around 0.8 V (vs.RHE). DME adsorbed at Pt electrode more weakly and slowly than oxygen, methanol, even hydrogen. The onset-potential and the peak\|current potential of DME oxidation were 50 mV and 110 mV less than that of methanol respectively, thus advantageous for improving fuel cell voltage. GC showed that small amount of HCHO was generated during DME electro-oxidation. Based on the electrochemical and GC findings, the mechanism of DME electro-oxidation at Pt electrode was first proposed, and from this it is evident that DME electro-oxidation is a multi-pathway reaction.

关 键 词：二甲醚 直接二甲醚燃料电池 铂电极 电氧化 

分 类 号：O646[理学—物理化学]