▎ 摘　　要

In this study, Pt-Pd nanoparticles (NPs) supported on few-layer graphene (FLG) have been firstly prepared by one-step arc discharge evaporation of carbon electrodes containing both Pt and Pd elements. The few-layer graphene and Pt-Pd nanoparticles were achieved simultaneously through the evaporation process. After a high-temperature hydrogen treatment, the Pt-Pd/graphene was applied in the study of methanol oxidation in direct methanol fuel cell. The total weight of electrocatalyst keeps 2 wt% of the electrode. The sample with a mass ratio of Pt: Pd = 3: 1 (H-Pt3Pd1/G) exhibits better electrocatalytic activity (198 mA mg(-1) pt) and better tolerance to carbon monoxide(CO) poisoning (I-f/I-b= 1.26). It is noteworthy that the value of I-f/I-b can reach to 1.55 for the sample with the mass ratio of Pt: Pd = 2: 1 (H-Pt2Pd1/G), which implies its excellent ability of CO tolerance. The introduction of Pd element may open a new strategy to improve the CO tolerance by arc discharge evaporation.