▎ 摘　　要

NOVELTY - Functionalized graphene composite proton exchange membrane preparation involves reducing graphene oxide to obtain graphene, and grafting atom transfer radical polymerization (ATRP) initiator to the surface of graphene through diazonium salt addition reaction to obtain atom transfer radical polymerization (ATRP) initiator grafted modified graphene. The monomer containing acidic groups is grafted onto the surface of the obtained ATRP initiator grafted modified graphene by ATRP reaction to obtain acidic group polymer grafted graphene. The functionalized graphene composite proton exchange membrane is prepared by solution casting method. USE - Method for preparing functionalized graphene composite proton exchange membrane used for preparing methanol fuel cell (claimed). ADVANTAGE - The method prepares the functionalized graphene composite proton exchange membrane in a simple, cost-effective and eco-friendly manner with improved dispersibility of graphene in the Nafion (RTM: sulfonated tetrafluoroethylene-based fluoropolymer-copolymer) matrix. The acidic groups on the surface and the acidic groups in the Nafion matrix form an efficient continuous electron transfer channel at the Nafion (RTM: sulfonated tetrafluoroethylene based fluoropolymer-copolymer)-graphene interface to realize high temperature enhanced proton conduction under low humidity conditions, where the two-dimensional layered structure of graphene can effectively control the size of the channel, block the diffusion of methanol molecules, realize the enhancement of the alcohol barrier performance of the Nafion (RTM: sulfonated tetrafluoroethylene based fluoropolymer-copolymer) membrane, and solve the common key problem of the Nafion (RTM: sulfonated tetrafluoroethylene based fluoropolymer-copolymer) proton exchange membrane.