▎ 摘　　要

NOVELTY - Preparing porous graphene nanosheet involves pretreating reactant by weighing potassium hydroxide, nano magnesium oxide, and anthracene. The potassium hydroxide is ground into a powder, uniformly mixed with nano-magnesium oxide and anthracene, and mixture of anthracene, potassium hydroxide and nano-magnesium oxide. The mixture is ground uniformly to obtain reactant. The total mass of the potassium is 2/5-6/11 wt.%, and mass ratio of potassium hydroxide to anthracene is 2:1 to 3:1. The reactant is placed in a corundum boat which is placed in a horizontal tube furnace, and air in the tube furnace is drained by argon gas. The react is then heated to elevated temperature and then naturally cooled to room temperature, washed, dried and sieved to obtain porous graphene nanosheet. USE - Method for preparing porous graphene nanosheet for supercapacitor. ADVANTAGE - The method enables to prepare porous graphene nanosheet which has high specific surface area which is 1457-2343 m2/g. The average pore diameter of product is 2.39-3.32 nanometer, and product has current density of 0.05 Ampere/g, specific volume of the 268 F/g, current density increases to 20 Ampere/g, specific volume of 204 F/g, high capacity and good rate performance.