Pt和Sb、S吸附原子修饰的Pt电极上1,3-丁二醇吸附和氧化过程  

Adsorption and Oxidation of 1,3-Butanediol on Pt and Sb,S Modified Pt Electrodes

作　　者：林珩[1] 陈声培[2] 卢江红[1] 林进妹[1] 薛珲[1] 林爱兰[1] 陈国良[1] 

机构地区：[1]漳州师范学院化学系,福建漳州363000 [2]厦门大学化学系

出　　处：《贵金属》2003年第1期15-20,共6页Precious Metals

基　　金：国家自然科学基金 (2 983 3 0 60 );福建省教委科研基金资助项目 (K2 0 0 110 1)

摘　　要：应用电化学循环伏安和石英晶体微天平 (EQCM )研究了 1 ,3 -丁二醇 ( 1 ,3 -BDL )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。从电极表面质量变化的结果分析 ,可认为 1 ,3 -丁二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 1 ,3 -丁二醇电催化氧化活性。与Pt电极相比较 ,饱和吸附Sb原子的Pt电极 ,1 ,3 -丁二醇氧化的峰电位负移了 0 2 5V ,峰电流增加了近 1倍。相反 ,Pt电极表面S吸附原子的氧化会消耗表面氧物种 ,饱和吸附S原子的Pt电极上 1 ,3 -丁二醇的电氧化受到抑制。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 1,3-butanediol on Pt and Pt modified with Sb and S in saturation(Pt/Sb ad and Pt/S ad )electrodes were studied by using cyclic voltammetry and electrochemical quartz crystal microbalance(EQCM).The results demonstrated that the oxidation of 1,3-butanediol depended strongly on oxidation states of electrode surface.Sb adatoms on Pt surface could adsorb oxygen at relatively low potentials,and exhibited catalytic effects for 1,3-butanediol oxidation.In comparison with the case of Pt electrode,the oxidation peak potential of 1,3-butanediol on Pt surface modified with Sb in saturation was negatively shifted about 250 mV with peak current being doubly increased.In a contrary,the oxidation of S adatoms consumed oxygen species of Pt electrode surface.As a consequence,the oxidation of 1,3-butanediol was inhibited on Pt surface modified with S in saturation.The EQCM studies provided quantitative results of surface mass changes during 1,3-butanediol oxidation,and threw new light in elucidating different effects of adatoms Sb ad and S ad on Pt electrode surface towards 1,3-butanediol oxidation.

关 键 词：1 3-丁二醇 吸附 氧化 铂电极 修饰电极 石英晶体微天平 

分 类 号：O646.54[理学—物理化学]