▎ 摘　　要

NOVELTY - The method for preparing graphene/nitrogen-doped carbon/nickel/nickel oxide composite material involves dissolving polyacrylamide in deionized water to prepare polymer solution, adding graphene aqueous solution, controlling the concentration of graphene oxide in the polymer solution, and uniformly stirring, adding nickel salt to the solution, fully stirring, and controlling the nickel ion concentration in the solution, adding crosslinking agent to the aqueous polymer solution, then adding ascorbic acid as reducing agent, and fully stirring, then adding hydrochloric acid to the solution and stirring, adjusting the pH value of the solution, transferring the solution to PTFE-lined autoclave, carrying out hydrothermal reaction to obtain reduced graphene oxide/crosslinked polyacrylamide/nickel salt composite hydrogel and cooling, and drying in freeze-dryer to obtain reduced graphene oxide/crosslinked polyacrylamide/nickel salt composite aerogel, and calcining. USE - The method is useful for preparing graphene/nitrogen-doped carbon/nickel/nickel oxide composite material, which is useful for preparing supercapacitor electrode (claimed). ADVANTAGE - The method enables simple and economical preparation of graphene/nitrogen-doped carbon/nickel/nickel oxide composite material with excellent electrochemical performance, high product ratio capacitance and reliability. DETAILED DESCRIPTION - The method for preparing graphene/nitrogen-doped carbon/nickel/nickel oxide composite material involves dissolving polyacrylamide in deionized water to prepare 0.5-3 %mass polymer solution, adding graphene aqueous solution, controlling the concentration of graphene oxide in the polymer solution at 0-1 mg/ml, and uniformly stirring, adding nickel salt to the solution, fully stirring for 0.5 hour, and controlling the nickel ion concentration in the solution at 0.05-0.20 mol/l, adding crosslinking agent to the aqueous polymer solution, then adding ascorbic acid as reducing agent, where the mass ratio of graphene oxide and ascorbic acid is 1:4 and fully stirring for 0.5 hour, then adding 50-400 mu l hydrochloric acid to the solution and stirring, adjusting the pH value of the solution to 3-6.5, transferring the solution to PTFE-lined autoclave, carrying out hydrothermal reaction at 100-150 degrees C for 8-15 hours to obtain reduced graphene oxide/crosslinked polyacrylamide/nickel salt composite hydrogel and naturally cooling to room temperature, subjecting composite hydrogel to liquid nitrogen low temperature at -196 degrees C for 0.5 hours, and drying in freeze-dryer for 8-24 hours to obtain reduced graphene oxide/crosslinked polyacrylamide/nickel salt composite aerogel, and calcining at heating rate of 1 degrees C/minute to 600-900 degrees C for 2 hours. An INDEPENDENT CLAIM is included for graphene/nitrogen-doped carbon/nickel/nickel oxide composite material prepared by the method.