▎ 摘　　要

In this article, a facile synthesis of Pt/polyallylamine/reduced graphene oxide (Pt/PAA/RGO) composites is put forward by using PAA as a linker and stabilizer, which is characterized by ultraviolet visible absorption, fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray Photoelectron Spectroscopy and transmission electron microscopy. In the presence of PAA, Pt nanoparticles with an average diameter of 1.4 nm are uniformly dispersed on RGO. In contrast, as to Pt/RGO prepared without PAA, Pt nanoparticles averaged 4 nm are unevenly deposited and aggregated on RGO. Pt/PAA/RGO composites exhibit a higher conversion efficiency of methanol and a faster oxidation removal of adsorbed CO during the electrochemical catalysis process due to their greater electroactive surface area. The molecular pathway of methanol oxidation at the surface of Pt catalysts is revealed in the impedance measurements. The impedance response of Pt/PAA/RGO catalysts shows a capacitive, resistive, pseudoinductive or inductive behavior depending on the applied potential.