▎ 摘　　要

NOVELTY - A perfluorosulfonic acid membrane methanol permeability reducing method involves reducing methanol permeability of perfluorosulfonic acid membrane using sulfonated graphene, taking sulfonating reagent, oxidizing with graphene to obtain sulfonated graphene, dissolving sulfanilic acid and aryl diazonium salt with a synthetic sulfonic acid group, adding sodium nitrite, followed by adding solid graphene oxide to form graphene oxide solution, stirring, adding in diazonium salt solution, centrifuging, washing to give sulfonated graphene, freezing and drying to obtain solid sulfonated graphene. USE - Method for reducing methanol permeability of perfluorosulfonic acid membrane. ADVANTAGE - The method enables reducing perfluorosulfonic acid membrane methanol permeability with improved membrane application rate, improved fuel cell performance and improved service life. DETAILED DESCRIPTION - A perfluorosulfonic acid membrane methanol permeability reducing method involves reducing methanol permeability of perfluorosulfonic acid membrane using sulfonated graphene, taking sulfonating reagent such as diazonium salt with a sulfonic acid group, oxidizing with graphene to obtain sulfonated graphene, dissolving sulfanilic acid and aryl diazonium salt with a synthetic sulfonic acid group at 15-25 degrees C in warm water bath, adding sodium nitrite at 10-35 degrees C, mixing to homogeneous solution, pouring the homogeneous solution into 30 ml concentrated hydrochloric acid of 1 ml ice-water under stirring, maintaining ice-water bath for 40-100 minutes to form aryl diazonium salt, followed by adding solid graphene oxide in 50-100 ml water to form an aqueous solution of graphene oxide, stirring, adding in diazonium salt solution, centrifuging, washing with deionized water several times until neutral to give a solution of the sulfonated graphene, freezing and drying to obtain solid sulfonated graphene. AN INDEPENDENT CLAIM is also included for a method for preparing an active sulfonated graphene doped-Nafion (RTM: Perfluorinated membrane) composite film.