▎ 摘　　要

NOVELTY - Multi-stage sub-porous carbon aerogel material comprises graphene aerogel as skeleton and zeolitic imidazolate framework-8 (ZIF-8) derived carbon as modified particles, where the mass ratio of ZIF-8 derived carbon and graphene aerogel is 2:1-6:1. The ZIF-8 derived carbon has a nitrogen content of 5-15% and a diameter of 0.6-1.2 mu m. USE - The aerogel material is useful for preparing supercapacitor electrode material (claimed). ADVANTAGE - The aerogel material overcomes the technical defects of the current supercapacitor electrode material in the aspect of hole structure and surface functionalization, and has microporous-mesoporous-macropore multi-level pore structure and uniform distribution of nitrogen atoms, abundant pores, excellent conductivity and double-layer capacitance-pseudocapacitance compound. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the multi-stage sub-porous carbon aerogel material, involving (i) dispersing ascorbic acid and graphene oxide in water in a mass ratio of 5:1-10:1 to obtain a premixed solution, hydrothermally reacting hydrothermally reacting the premixed solution and drying to obtain a graphene aerogel, (ii) placing the graphene aerogel in a methanol solution of zinc nitrate hexahydrate for a first soaking at room temperature, taking out the graphene aerogel, putting in solution of dimethylimidazole in methanol for a second soaking, performing the first soaking and the second soaking for more than 2 cycles to obtain a graphene aerogel-ZIF-8 pre-composite, where in the methanol solution of zinc nitrate hexahydrate, the mass concentration of zinc nitrate is 10-15 g/l and the mass concentration ratio of methanol solution of zinc nitrate hexahydrate and methanol solution of dimethylimidazole is 1:(1.4-1.6), and (iii) heat-preserving the graphene aerogel-ZIF-8 pre-composite at 750-850 degrees C under a nitrogen atmosphere for calcining to obtain the product; (2) a supercapacitor electrode material comprising active material containing the multi-stage sub-porous carbon aerogel material; and (3) a method for preparing the supercapacitor electrode material, involving preparing the multi-stage sub-porous carbon aerogel material, mixing with polyvinylidene fluoride, dispersing in N-methylpyrrolidone to form a slurry, coating the slurry on a graphite sheet and drying to obtain the product.