▎ 摘　　要

NOVELTY - The method involves ultrasound peeling off of the graphite oxide to obtain graphene oxide nano-water solution. Thickness of a Nafion film is 25 to 35 micrometer, and Nafion film is used as a base film for heavy casting preprocessing. The p-phenylenediamine hydrochloric acid salt is used as adhesive on the Nafion film. A layer-by-layer assembly method is used, and the graphene oxide is assembled on the Nafion membrane surface for the rear treatment process to obtain a composite proton exchange film. USE - Method for preparing a composite proton exchange film of a methanol fuel cell. ADVANTAGE - The method greatly reduces the methanol permeability of composite proton exchange film, easily obtains the graphene oxide, reduces the cost, simplifies the technique and realizes strong operability, and does not cause pollution to the environment. DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram illustrating a composite proton exchange film preparation method. '(Drawing includes non-English language text)'