▎ 摘　　要

NOVELTY - Graphene oxide doped chitosan alkaline anion exchange compound film comprises chitosan, quaternary ammonium group and the polymer solution in the mass ratio of 1:0.1:1, and the total amount of compound film is 0.5-2 wt.% of the graphene oxide. USE - The compound film is used in alkaline fuel battery, metal-air battery, carbon dioxide electrochemical reduction and waste water treatment (claimed). ADVANTAGE - The preparation method is simple, the film has high ion conductivity, good mechanical property and is heat stabile. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the compound film comprising (i) taking chitosan, dissolving in acetic acid solution, heating and stirring, adding quaternary ammonium radicals and polymer solution, stirring, adding graphene oxide aqueous solution, ultrasonicating to obtain a mixed solution, vacuum drying to obtain precursor polymer film, where the mass ratio of chitosan and quaternary ammonium group containing polymer solution is 1:0.1-1,the alkene graphite oxide accounts for 0.5-2 wt.% polymer film, (ii) taking step (i) obtained polymer film and carrying out cross linking, ion exchanging with potassium hydroxide solution, removing, cleaning, and obtain the product.