▎ 摘　　要

Nano-Pt/graphene was prepared by adopting ascorbic acid as environmentally friendly reductant in one-step process. The morphology and structure of the products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The results indicate that Pt nanoparticles are well dispersed in the wrinkled graphene nanosheets, which effectively prevents the aggregation of Pt nanoparticles. The electrocatalytic activity and stability of the catalysts for methanol oxidation were investigated by cyclic voltammetry (CV) and chronoamperometry (CA). AC impedance (EIS) shows that nano-Pt/graphene has superior charge transport properties than Pt nanoparticles, leading to the decrease of transfer resistance by 34.8%. Furthermore, the diffusion coefficient of methanol on Pt-G/GC is 1.42x10(-9) cm(2) . s(-1) by chronocoulometry (CC). The results show that the nano-Pt/graphene has higher electrocatalytic activity and stability for methanol oxidation than Pt nanoparticles, which could significantly increase the catalytic active surface area of the electrode and accelerate charge transport and transfer perfor.lnance.