▎ 摘　　要

NOVELTY - Preparation of graphene involves preparing oxidized graphene emulsion by ultrasonically treating a graphene oxide solution and citric acid for 0.5-2 hours, adding an oil phase, mixing and stirring, heating the emulsion at 180-200 degrees C for 0.5-5 hours, obtaining a precursor, freeze-drying the precursor, reacting in an inert atmosphere at 650-1000 degrees C for 1-5 hours, washing and drying. USE - Preparation of graphene used in preparation of supercapacitor (claimed). ADVANTAGE - The method enables simple and controllable preparation of graphene having high specific surface area and conductivity, and stable structure, by realizing self-assembly of graphene oxide layer at emulsion interface, suppressing agglomeration and stacking of graphene sheets, and effectively reducing interface resistance, without requiring expensive equipment, vacuum and high pressure conditions. The supercapacitor obtained using the graphene has high specific capacity, rate characteristics and cycle performance.