▎ 摘　　要

NOVELTY - Preparation of bimetallic organic framework composite material involves dissolving zinc salt in solvent to obtain solution (A), dissolving 2-methylimidazole in solvent to obtain solution (B), stirring, slowly adding solution (B) to solution (A), leaving still at room temperature, carrying out centrifugal washing and drying, dissolving ZIF-8 in solvent to obtain solution (C), dissolving 2-methylimidazole and cobalt salt in solvent to obtain solution (D), stirring, slowly adding solution (D) to solution (C), and drying to obtain bimetallic organic framework precursor ZIF-8 doped with ZIF-67, annealing precursor powder, acidifying porous carbon, adding an aqueous solution of polydiallyldimethylammonium chloride and stirring well, centrifuging, adding different amounts of graphene oxide, stirring well, washing, freeze-drying, annealing in tube furnace at high temperature under an argon atmosphere and obtaining porous carbon/reduced graphene composite with different graphene contents. USE - Preparation of bimetallic organic framework composite material used as cathode catalyst for preparing microbial fuel cell (all claimed). ADVANTAGE - The method provides bimetallic organic framework composite material by evenly distributed porous carbon material on the graphene sheet layer. The composite material has excellent stability and is economical. When material is applied to microbial fuel cell (MFC) cathode catalyst, it shows excellent electrochemical catalytic performance. DETAILED DESCRIPTION - Preparation of bimetallic organic framework composite material involves dissolving zinc salt in solvent to obtain solution (A), dissolving 2-methylimidazole in solvent to obtain solution (B), stirring, slowly adding solution (B) to solution (A), leaving still at room temperature, centrifugal washing and drying at 60 degrees C to obtain ZIF-8, dissolving ZIF-8 in solvent to obtain solution (C), dissolving 2-methylimidazole and cobalt salt in solvent to obtain solution (D), stirring, slowly adding solution (D) to solution (C) and leaving still at room temperature, centrifugal washing and drying at 60 degrees C to obtain bimetallic organic framework precursor ZIF-8 doped with ZIF-67, annealing precursor powder in tube furnace at high temperature under argon atmosphere to obtain porous carbon core-shell structure, acidifying porous carbon, adding an aqueous solution of polydiallyldimethylammonium chloride and stirring well, centrifuging, adding different amounts of graphene oxide, stirring well, centrifuging, washing with water, freeze-drying, annealing in tube furnace at high temperature under an argon atmosphere and obtaining porous carbon/reduced graphene composite with different graphene contents. An INDEPENDENT CLAIM is included for use of bimetallic organic framework composite material for assembling microbial fuel cell device, which involves dissolving composite material in an ethanol solution containing an appropriate amount of Nafion (RTM: sulfonated tetrafluoroethylene based fluoropolymer-copolymer), ultrasonically mixing mixture to obtain mixed material, drip-coating mixed material on a glassy carbon electrode, drying in air, building H-type double-chamber microbial fuel cell using Shewanella bacteria as anode chamber, lactate-containing medium as substrate and glassy carbon electrodes modified with composite material as cathode chamber.