▎ 摘　　要

NOVELTY - Preparation of composite proton exchange membrane involves mixing graphene oxide, imidazole ionic liquid and organic solvent to obtain dispersion, mixing the dispersion with perfluorosulfonic acid resin solution to obtain mixed solution, preparing a membrane using the mixed solution, and heat-treating. USE - Preparation of composite proton exchange membrane used for fuel cell (all claimed). ADVANTAGE - The method is simple, suitable for industrial production, the prepared proton exchange membrane has high proton conductivity, thin thickness and good mechanical performance. The graphene oxide has good dispersibility in the perfluorosulfonic acid resin solution and keeps the original lattice structure, imidazole ionic liquid, graphene oxide and perfluorosulfonic acid resin, on the one hand, increasing the proton conduction site. The method improves the mechanical strength the condition of thinner thickness, high tensile strength, good hydrogen permeability, and the lower film thickness is good for reducing proton-exchange membrane internal resistance. The preparation technique of the invention is simple and environment-friendly, the thickness of the membrane is controllable, the efficiency is high, and it is also good for mass production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the composite proton exchange membrane, which has thickness of 12-25 µm.