Pt及其修饰电极上乙醇吸附和氧化的CV和EQCM研究  

Adsorption and Oxidation of Ethanol on Pt and Sb, S Modified Pt Electrodes Using Cyclic Voltammetry and EQCM

作　　者：陈国良[1] 陈声培[2] 甄春花[2] 周志有[2] 孙世刚[2] 

机构地区：[1]漳州师范学院化学系 [2]厦门大学化学系

出　　处：《化学学报》2001年第8期1253-1257,共5页Acta Chimica Sinica

基　　金：国家自然科学基金，高等学校博士学科点专项科研项目

摘　　要：运用电化学循环伏安和石英晶体微天平研究了乙醇在Pt电极和以Sb,S吸附原子修饰的Pt(Pt/Sbad和Pt/Sad)电极上的吸附和氧化过程.结果表明乙醇的氧化与电极表面氧物种有着极其密切的关系.Pt电极表面Sb吸附原子能在较低的电位下吸附氧,可显著提高乙醇电催化氧化活性.相反,Pt电极表面S吸附原子的氧化会消耗表面氧物种,抑制了乙醇的电氧化.本文从表面质量变化提供了吸附原子电催化作用的新数据.The processes of adsorption and oxidation of ethanol on Pt, Pt,/Sb-ad and Pt/S-ad electrodes were studied by using cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). The results demonstrate that the oxidation of ethanol depends strongly on oxidation states of the electrode surface. Sb adatoms on Pt surface can adsorb oxygen at relatively low potentials and exhibit catalytic effects for ethanol oxidation. In contrary, the oxidation of S adatoms consumes oxygen species of Pt electrode surface. As a consequence, the oxidation of ethanol was inhibited by the presence Of S-ad. The EQCM studies provide quantitative results of surface mass variation during ethanol oxidation and have thrown new light in elucidating different effects of adatoms Sb-ad and S-ad on Pt electrode surface towards ethanol oxidation.

关 键 词：石英晶体微天平 PT电极 修饰电极 乙醇 吸附 电催化氧化 循环伏安 

分 类 号：O623.411[理学—有机化学] O646.5[理学—化学]