Pt及其修饰电极上乙醇吸附和氧化的CV和EQCM研究

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。

Adsorption and oxidation of ethanol on Pt and Sb, S modified Pt electrodes using cyclic voltammetry and EQCM

The processes of adsorption and oxidation of ethanol on Pt, Pt/Sban and Pt/San electrodes were studied by using cyclic voltammetry and electrochemical quartz crystal micorbalance (EQCM). The results demonstrate that the oxidation of ethanol depends strongly on oxidation states of the electrode surface. Sb adatomes on Pt surface can adsorb oxygen at relatively low potentials and exhibit catalytic effects ofr 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 San. The EQCM studies provide quantitative results of surface mass variation during ethanol oxidation and have thrown new light in elucidating different effects of adatoms Sbad and Sad on Pt electrode surface towards ethanol oxidation.