▎ 摘　　要

NOVELTY - Preparing porous graphene comprises (1) mixing the graphene oxide hydrogel and alkali solution, obtaining mixture; and (2) subjecting the mixture obtained in the above step to heat treatment under protective atmosphere, obtaining porous graphene. USE - The porous graphene is useful for supercapacitor (claimed). ADVANTAGE - The method: is sample, environmentally-friendly, and is suitable for large-scale industrial production; and can handle the waste liquid in simple manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the supercapacitor comprising the porous graphene prepared by above mentioned method.