▎ 摘　　要

NOVELTY - Preparing three-dimensional reduced graphene oxide/manganese dioxide composite material comprises adding potassium persulfate, phosphorus pentoxide, concentrated sulfuric acid into graphite powder, placing in water bath, stirring and refluxing, oxidizing with concentrated sulfuric acid and concentrated nitric acid, potassium permanganate, and hydrogen peroxide (30%), washing until pH is 5, to prepare graphene oxide liquid product; preparing 2 mg/ml graphene oxide dispersion liquid by hydrothermal process, heating at 100 degrees C, heating at 180 degrees C, freezing and drying to prepare three-dimensional reduced graphene oxide aerogel; hydrothermal synthesizing three-dimensional reduced graphene oxide/manganese dioxide composite material, where hydrothermal synthesizing three-dimensional reduced graphene oxide/manganese dioxide composite material comprises preparing 1 mg/ml potassium permanganate solution, adding reduced graphene oxide aerogel, heating the mixture, and annealing. USE - The method is useful for preparing three-dimensional reduced graphene oxide/manganese dioxide composite material. ADVANTAGE - The composite material: has sheet structure, regular uniform sheet thickness, and has specific capacitance of 10-20 times that of pure manganese dioxide. DETAILED DESCRIPTION - Preparing three-dimensional reduced graphene oxide/manganese dioxide composite material comprises adding 1.5 g potassium persulfate, 1.7 g phosphorus pentoxide, 7.5 ml concentrated sulfuric acid into 0.65 g of graphite powder, placing in water bath, stirring and refluxing at 80 degrees C for 5 hours, oxidizing with 23 ml concentrated sulfuric acid and 0.5 ml concentrated nitric acid, 3.5 g potassium permanganate, and 7.5 ml hydrogen peroxide (30%), washing until pH is 5, to prepare graphene oxide liquid product; preparing 2 mg/ml graphene oxide dispersion liquid by hydrothermal process, heating at 100 degrees C for 30-60 minutes, heating at 180 degrees C for 5-24 hours, freezing and drying to prepare three-dimensional reduced graphene oxide aerogel; hydrothermal synthesizing three-dimensional reduced graphene oxide/manganese dioxide composite material, where hydrothermal synthesizing three-dimensional reduced graphene oxide/manganese dioxide composite material comprises preparing 1 mg/ml potassium permanganate solution, adding reduced graphene oxide aerogel, where aerogel and manganese dioxide ratio is 1:4,4:1,1:8,8:1, heating the mixture at 150 degrees C for 1 hours, annealing at 300 degrees C for 1 hours to obtain three-dimensional reduced graphene oxide/manganese dioxide composite material. An INDEPENDENT CLAIM is also included for the three-dimensional reduced graphene oxide/manganese dioxide composite material is prepared by above mentioned method.