▎ 摘　　要

NOVELTY - Preparation of micro-nano structured graphene powder comprises hydrothermally synthesizing urchin-like cobalt hydroxide powder, soaking in 0.5-2% dimethylformamide solution of polymethyl methacrylate for not less than 20 minutes, taking out, drying, annealing at 700-1100 degrees C under hydrogen atmosphere for more than 2 minutes to obtain black powder, steeping with diluted hydrochloric acid solution for more than 24 hours, and drying. USE - Method for preparing micro-nano structured graphene powder (claimed). ADVANTAGE - The graphene powder has high crystal quality, simple preparation method, low cost, and controllable and easy synthesis.