▎ 摘　　要

NOVELTY - Method for preparing graphene, involves (a) using magnesium carbonate as a template, and preparing the composite of graphene and template by fluidized bed chemical vapor deposition method, (b) removing the template agent in the composite of the graphene and template agent by pickling to obtain graphene, and (c) adding the pickled filtrate with carbonate aqueous solution to obtain magnesium carbonate through regeneration, and recycling the magnesium carbonate to step (a) as a template agent to continue the preparation of graphene. USE - The method is useful for preparing graphene used as electrode material of supercapacitor (claimed). ADVANTAGE - The method adopts simple and easy to control process, and has low operating cost, and realizes the recycling of template agent, and reduces the production cost of graphene. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a graphene prepared by the above-mentioned method, where the specific surface area of the graphene is 1500-2000 m2/g, and the pore size distribution is 2-10 nm; and (2) a supercapacitor, where the electrode material of the supercapacitor is the graphene.