▎ 摘　　要

NOVELTY - The preparation method of graphene-carbon nanofiber composite aerogel involves adding dried carbon nanofiber to concentrated nitric acid, reacting, washing with water to obtain acidified carbon nanofiber suspension, dispersing graphene oxide in suspension to obtain graphene oxide-carbon nanofiber dispersion, adding reducing agent to dispersion, restoring at 80-180 degrees C for 1-24 hours or restoring at room temperature for 1-10 days to obtain restored sample, rinsing the restored sample with deionized water, immersing in aqueous ammonia, storing, and freeze drying or supercritical drying. USE - Preparation of graphene-carbon nanofiber composite aerogel (claimed). ADVANTAGE - The method enables the preparation of graphene-carbon nanofiber composite aerogel having excellent strength under mild reaction conditions. DETAILED DESCRIPTION - The preparation method of graphene-carbon nanofiber composite aerogel involves adding dried carbon nanofiber to 69 %mass concentrated nitric acid in a ratio of 1 g:40-100 ml, reacting at 80-100 degrees C for 3-4 hours, washing the resulting product with water to obtain acidified carbon nano fiber suspension, dispersing graphene oxide in acidified carbon nanofiber suspension in a mass ratio of 0.5-10:1 to obtain graphene oxide-carbon nanofiber dispersion, adding reducing agent to graphene oxide-carbon nanofiber dispersion in a mass ratio of 10-1:1, restoring at 80-180 degrees C for 1-24 hours or restoring at room temperature for 1-10 days to obtain restored sample, rinsing the restored sample with deionized water, immersing in 10-28% aqueous ammonia, storing at 90 degrees C for 0.5-2 hours, and freeze drying or supercritical drying. The reducing agent is ammonium sulfide, sodium sulfide, sodium hydrosulfide, melamine, polyethyleneimine, hydrazine hydrate, sodium borohydride and/or hydroiodic acid.