▎ 摘　　要

NOVELTY - A nanosheet material comprises a composite sheet structure composed of metal organic framework nanosheets and graphene-based material sheets, which are laminated or alternately laminated. The thickness of each layer of metal organic framework nanosheets is 1-5 nm. The thickness of each layer of graphene-based material is 1-10 nm. The thickness of the composite sheet is 2-100 nm. USE - Nanosheet material used in electrocatalytic reactions such as oxygen reduction electrocatalysis, oxygen evolution electrocatalysis, methanol oxidation or carbon dioxide electroreduction, and gas adsorption materials, drug release materials, and material separation materials (all claimed). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the nanosheet material, which involves preparing graphene oxide by Hummer method with or without the use of graphene oxide to prepare doped graphene and with or without loading graphene with metal nanoparticles, dispersing graphene-based material in solutions of dimethylformamide, dimethylacetamide or dimethyl sulfoxide at a concentration of 0.5-5 mg/ml to obtain a colloidal, adding transition metal salt to the obtained colloidal solution at a concentration of 0.01-0.5 mmol/ml, and uniformly ultrasonically dispersing, adding same amount of ligand as the transition metal salt, and ultrasonically dispersing again to obtain a uniform mixture, adding mixed solvent of ethanol and water in a volume ratio of (1:5)-(5:1) to the above mixture so that the mixed solvent accounts for 5-20% of the total volume of the mixture, and then dispersing again, adding 1-4% of the total volume of the mixture of triethylamine precipitant under inert gas protection, and quickly sealing the container, and placing under ultrasonic conditions for reaction, separating and washing, freeze-drying the precipitate to obtain the composite structural material sample; and (2) use of the nanosheet material used in electrocatalytic reactions such as oxygen reduction electrocatalysis, oxygen evolution electrocatalysis, methanol oxidation or carbon dioxide electroreduction, or gas adsorption materials, drug release materials, or material separation materials.