▎ 摘　　要

The electrochemical oxidation of formaldehyde over graphene surfaces modified with Pt-Ru co-catalyst is presented. Graphene was chemically converted from graphite and Pt-Ru co-catalyst was electrochemically deposited using cyclic voltammetry. The hybrid surface is prepared using "green approaches" and displayed electrocatalytic activity towards formaldehyde in the form of current oscillations. The current oscillations that were mainly due to adsorption/desorption of carbonaceous oxidative products are a factor of several parameters such as the concentrations of both formaldehyde and supporting electrolyte in solution, the amount of catalyst loading, scan rate of potential, upper potential limit, and the temperature change. CCG/Pt-Ru exhibited higher electrocatalytic activity toward formaldehyde electro-oxidation, and intense electrochemical current oscillations were obtained at relatively low HCHO concentrations compared to other work mentioned in literature for CCG/Pt-Pd.