▎ 摘　　要

NOVELTY - Preparation of graphene involves mixing graphite oxide and sulfuric acid and heat-treating mixture at 50-400 degrees C under normal pressure or negative pressure. USE - Preparation of graphene. Uses include but are not limited to optical material, conductive material, sensor material, secondary battery material and supercapacitor material. ADVANTAGE - The method efficiently and economically provides graphene having specific capacity of 400 F/g, by consuming reduced amount of energy, and without causing pollution to environment and without inert gas protection or vacuum protection, in short period of time.