▎ 摘　　要

NOVELTY - Benzimidazole polymer/modified graphene oxide blend comprises benzimidazole polymer and phosphonic acid modified graphene oxide, where the phosphonic acid in the phosphonic acid-modified graphene oxide is chosen from amino-containing phosphonic acid compounds. USE - Blend useful in proton exchange membrane for fuel cell or flow battery (all claimed). ADVANTAGE - The blend reduces the phosphoric acid doping level to below 10, improves the proton conductivity up to 9.83x 102 second/cm. The method uses phosphonic acid modified graphene oxide to improve compatibility and binding force with benzimidazole polymers, improves the ion conductivity of the blend, reduces the phosphoric acid doping level (ADL) of the blend, improves the anti-swelling performance and mechanical property of the blend, optimizes the overall performance of the blend, and is suitable for manufacturing fuel cell electrolyte membrane material.