▎ 摘　　要

NOVELTY - The preparation method of graphene-based carbon nanofiber involves adding crystalline flake graphite and concentrated sulfuric acid to phosphoric acid, uniformly mixing, adding potassium permanganate to the mixture and then stirring, adding deionized water and hydrogen peroxide to the mixture and then stirring, separating the mixture and then washing, drying the mixture to obtain graphene oxide, adding graphene oxide to N,N-dimethylformamide and then ultrasonically dispersing, adding polyacrylonitrile to the mixture and then heating at 40-50 degrees C, and carbonizing. USE - The method is useful for preparation of graphene-based carbon nanofiber (claimed). ADVANTAGE - The method enables preparation of graphene-based carbon nanofiber with high specific surface area and excellent conductivity. DETAILED DESCRIPTION - The preparation method of graphene-based carbon nanofiber involves adding 2-5 pts. wt. crystalline flake graphite and 300-500 pts. wt. concentrated sulfuric acid to 30-60 pts. wt. phosphoric acid, uniformly mixing, adding 15-20 pts. wt. potassium permanganate to the mixture and then stirring at 45-55 degrees C for 9-18 hours, adding 300-500 pts. wt. deionized water and 20-50 pts. wt. 10-30 wt.% hydrogen peroxide to the mixture and then stirring at 0-5 degrees C for 5-10 minutes, separating the mixture and then washing using deionized water, 10-30 wt.% hydrochloric acid and absolute ethanol, drying the mixture under vacuum to obtain graphene oxide, adding 0.01-0.1 pt. wt. graphene oxide to 5-20 pts. wt. N,N-dimethylformamide and then ultrasonically dispersing, adding 0.5-1.5 pts. wt. polyacrylonitrile to the mixture and then heating at 40-50 degrees C, continuously stirring the mixture and then dissolving in polyacrylonitrile to obtain a mixed solution, electrostatically spinning the mixed solution and then oxidizing at 250-300 degrees C, and carbonizing at 750-850 degrees C for 30-120 minutes.