The processes of adsorption and oxidation of glycerol on Pt, Pt/Sbad and Pt/Sad 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 Sbad and Sad on Pt electrode surface towards glycerol oxidation.
展开▼
