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

摘要

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.