Pt及其修饰电极对丙三醇氧化的电催化性能研究

运用电化学循环伏安和石英晶体微天平研究了丙三醇在Pt电极和以Sb,S吸附原子修饰的Pt(Pt/Sbad和Pt/Ssd）电极上的吸附和氧化过程。结果表明丙三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，可显著提高丙三醇电催化氧化活性，与Pt电极相比较，Sb吸附原子修饰的Pt电极使丙三醇氧化的峰电位负移了0．14V，相反，Pt电极表面S吸附原子的氧化合消耗表面氧物种，几乎完全抑制了丙三醇的电氧化。本文还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 Glycerol on Pt and Sb, S- Modified Pt Electrodes

The processes of adsorption and oxidation of glycerol on Pt, 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 glycerol depended strongly on oxidation states of electrode surface. Sb adatoms on Pt surface can adsorb oxygen at relatively low potentials, and exhibit catalytic effects for glycerol oxidation. In contrast to Pt electrodes, the oxidation peak potential of glycerol on Pt surface modified with Sb in saturation was negatively shifted by about 140 mV. In a contrary, the oxidation of S adatoms consumes oxygen species of Pt electrode surface. As a consequence, the oxidation of glycerol was inhibited on Pt surface modified with Sb in saturation. The EQCM studies provided quantitative results of surface mass variation during glycerol oxidation, and have thrown new light in elucidating different effects of adatoms Sb ad and S ad on Pt electrode surface towards glycerol oxidation.