▎ 摘　　要

NOVELTY - Preparing a three-dimensional porous graphene material based on a high area specific capacity of rice husk involves: (1) immersing the rice husk in a nickel salt solution, where the mass ratio of nickel element to rice husk is (0.03-0.06):1, stirring, and drying to obtain a rice husk-nickel salt mixture; (2) carbonizing the rice husk-nickel salt mixture at 700 degrees C to obtain rice husk-nickel (RHNi-700), removing the nickel salt particles in RHNi-700 by acid soaking, washing and drying to obtain RHNi-700A; and (3) dissolving the RHNi-700A and alkali in water at a mass ratio of 1:(4-5), uniformly mixing and drying, then stirring the dried mixture at 550-650 degrees C under an inert gas atmosphere. USE - The method is useful for preparing a three-dimensional porous graphene material, which is useful in an electrode (claimed). ADVANTAGE - The method: enables simple preparation of the three-dimensional porous graphene material; fully utilizes biological waste; provides the possibility of converting the rice husk into a high value-added large-capacity supercapacitor carbon electrode material; and reduces the environmental pollution caused by the rice husk. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) three-dimensional porous graphene material based on high area specific capacity of rice husk prepared by the above method; and (2) an electrode, which comprises the three-dimensional porous graphene material, a conductive carbon black, PTFE, and foamed nickel.