▎ 摘　　要

NOVELTY - Preparing graphene comprises (i) oxidizing graphite via Hummer method, (ii) feeding graphite oxide and magnesium powder of ratio 1000:1-1:1000 into a ball-milling jar and ball-milling for 0-100 hours, where the ratio of grinding media to material is 1:100-1000:1 and the ball-milling rotating speed is 0-1000 revolutions/minute, (iii) washing the mixture with water and drying the reaction product at 40-200 degrees C, (iv) filtering, washing with hydrochloric acid and drying. USE - The graphene is useful as supercapacitor electrode material. ADVANTAGE - The method is simple. The graphene has electrochemical property, high specific capacitance, high magnification rate and long circulation stability.