关键词: 电催化氧化, 吸附锑原子, 欠电位沉积, 铂电极, 甲醛, 甲酸

Abstract: The electrocatalytic activity for the oxidation of formaldehyde and formic acid ona Sb-modified platinum (Pt/Sb_(ad))was investigated.Results showed that the Pt/Sb_(ad) electrode waselectrocatalytically more active than a Pt electrode in the anodic oxidation of formaldehyde and formicacid.In the case of formaldehyde,an oxidation peak appeared at a potential of ca.0.7V.During theoxidation of formic acid,a 4-fold increase in the 1st peak current was observed.The Sb-modifiedplatinum electrode was found to be most electrocatalytically active at a coverage of 0.75±0.05.Theelectrocatalytic activity of the Pt/Sb_(ad) electrode can be best explained in terms of the geometrical effect,which may lead to the inhibition of the formation of the adsorbed poison Pt-C=O.The reactionmechanism for the catalytic oxidation of the two subetances at a lower potential on a Pt/Sb_(ad) electrodewas suggested.The effects of other factors including electrolysis time,deposition potential and mediaon the electrocatalytic activity were also studied and discussed.

Key words: Electrocatalytic oxidation, Adsorbed antimony atom, Underpotentialdeposition, Platinum electrode, Formaldehyde