Pt电极上吸附原子对正丙醇电催化氧化性能的影响  

The Study on the Electrocatalytic Properties of n-propyl Alcohol in Alkaline Media on Pt Electrodes Modified with Adatoms

作　　者：林珩[1] 邓友娥[2] 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]福建师范大学高分子研究所,福建福州350007

出　　处：《福建师范大学学报（自然科学版）》2003年第1期54-58,共5页Journal of Fujian Normal University：Natural Science Edition

基　　金：福建省教育厅科研基金资助项目 ( K2 0 0 110 1);漳州师范学院科研资助项目 ( SK 0 10 0 8;SK0 0 14

摘　　要：用电化学循环伏安和石英晶体微天平研究了碱性介质中正丙醇在 Pt电极和以 Sb,S吸附原子修饰的 Pt( Pt/Sbad和 Pt/Sad)电极上电催化氧化过程 .结果表明正丙醇的氧化与溶液酸碱性关系密切 .酸性介质中正丙醇在 Pt电极上的 CV曲线有两个正向氧化峰 ,而碱性介质中只有一个正向氧化峰 ,第二个氧化峰的消失可能是由于碱性介质中电极钝化引起的 .与 Pt电极相比较 ,饱和 Sb吸附原子修饰的 Pt电极使碱性介质中正丙醇氧化的峰电位负移了 0 .1 0 V,峰电流增加了 2 .2倍 ,表现出显著的电催化活性 .相反 ,Pt电极表面 S吸附原子抑制了正丙醇的电氧化 .还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 n-propyl a lcohol in alkaline media on Pt and Pt modified with Sb and S (Pt/Sb ad and Pt/S ad ) electrodes were studied by using cyclic voltammetry and el ectrochemical quartz crystal microbalance (EQCM). The results demonstrated that the oxidation of n-propyl alcohol depends strongly on oxidation states of elec trode surface and the acidity of the solution. Sb adatoms on Pt surface can ads orb oxygen at relatively low potentials, and exhibit catalytic effects for n-pr opyl alcohol oxidation. In comparison with the case of Pt electrode, the oxidat ion peak potential of n-propyl alcohol on Pt surface modified with Sb was negat ively shifted about 100 mV with peak current being doubly increased. In a contr ary, the oxidation of S adatoms consumes oxygen species of Pt electrode surface . As a consequence, the oxidation of n-propyl alcohol was inhibited by the pre sence of S ad. The EQCM studies provided quantitative results of surfac e mass changes during n-propyl alcohol oxidation, and have thrown new light in elucidating different effects of adatoms Sb ad and S ad on Pt e lectrode towards n-propyl alcohol oxidation.

关 键 词：PT电极 电催化氧化性能 石英晶体微天平 铂电极 修饰电极 正丙醇 电化学循环伏安法 

分 类 号：O646.54[理学—物理化学]