▎ 摘　　要

NOVELTY - Preparation of high specific capacitance graphene comprises putting MCM-22 molecular sieve into carbon source, concentrated sulfuric acid and mixed aqueous solution of nickel salt, immersing, stirring at room temperature, dissolving, pre-processing carbon at 60-200 degrees C to obtain solid powder; roasting solid powder in vacuum tubular furnace, under the protection of inert gas to obtain nickel (Ni)-MCM-22 composite material; removing MCM-22 by centrifugal separation, and drying. USE - Method for preparing high specific capacitance graphene (claimed). ADVANTAGE - The obtained graphene sheet has high specific capacitance with 1-10 layers of graphene nanosheet, bi-dimensional size distribution is 65-700 nm, Brunauer-Emmett-Teller (BET)-Langmuir ratio surface area is 100-1000 m2/g and 200-2000 m2/g, conductivity is 20-150 S/m. The graphene is stacked to form three-dimensional net-like structure with aperture of 2-50 nm. DETAILED DESCRIPTION - Preparation of high specific capacitance graphene comprises: (A) putting MCM-22 molecular sieve into carbon source, concentrated sulfuric acid and mixed aqueous solution of nickel salt, immersing, stirring at room temperature, dissolving, pre-processing carbon at 60-200 degrees C to obtain solid powder, where MCM-22, carbon source, nickel salt and concentrated sulfuric acid ratio is 1:(1-3):(0.02-0.06):(0.1-0.3); (B) roasting solid powder in vacuum tubular furnace, under the protection of inert gas, roasting for 1-3 hours at 500-1200 degrees C to obtain nickel (Ni)-MCM-22 composite material; and (C) removing MCM-22 by centrifugal separation, and drying.