▎ 摘　　要

NOVELTY - The method for preparing rice hull-based graphene porous carbon material involves mixing nickel element and rice hull in ratio of 0.03-0.06:1, immersing rice hull in the nickel salt solution, stirring and drying to obtain rice hull-nickel salt mixture, carbonizing rice hull-nickel salt mixture at 700 degrees C to obtain RHNi-700, removing nickel salt particles in the RHNi-700, acid soaking, washed and drying to obtain RHNi-700A, dissolving RHNi-700A and alkali in water in mass ratio of 1:3-5, uniformly mixing and drying, heating under an inert gas atmosphere, drying and activating. USE - The method is useful for preparing rice hull-based graphene porous carbon material for preparing electrode (all claimed). ADVANTAGE - The method enables simple and economical preparation of rice hull-based graphene porous carbon material with high volume specific capacity and specific capacitance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) rice hull-based graphene porous carbon material prepared by the method; (2) electrode, which comprises rice hull-based graphene porous carbon material, conductive carbon black, PTFE and nickel foam; and (3) preparation method of electrode, which involves mixing rice hull-based graphene porous carbon material, conductive carbon black and PTFE with an anhydrous ethanol solution in mass ratio of 8:1:1, coating obtained slurry on the substrate, placing foamed nickel in the coated slurry, and drying at 80 degrees C for 12 hours.