▎ 摘　　要

NOVELTY - Preparation of ultra-high-specific surface area graphene aerogel involves mixing graphite powder and potassium permanganate, mixing with mixed acid of phosphoric acid and concentrated sulfuric acid, dissolving obtained product in deionized water, centrifuging, then dissolving in hydrochloric acid, drying, obtaining graphene oxide, dispersing graphene oxide in deionized water, stirring, ultrasonically frequency, centrifuging, obtaining graphene oxide dispersion liquid, mixing graphene oxide dispersion liquid and siloxane, heating, drying, introducing inert gas, heating, and cooling. USE - Preparation of ultra-high-specific surface area graphene aerogel (claimed). ADVANTAGE - The method enables preparation of graphene aerogel having ultra-high-specific surface area of 2491 m2/g or less and reduced damage of chemical structure, with suppressed occurrence of agglomeration. DETAILED DESCRIPTION - Preparation of ultra-high-specific surface area graphene aerogel involves mixing graphite powder and potassium permanganate in a weight ratio of 1:3-10, obtaining graphite powder and potassium permanganate mixture, mixing phosphoric acid and concentrated sulfuric acid in a weight ratio of 1:5-15, obtaining mixed acid, mixing 10-40 pts. wt. mixed acid and 1 pt. wt. graphite powder and potassium permanganate mixture in an ice bath, heating to 40-90 degrees C, reacting for 5-24 hours, adding obtained mixture to 10-50 pts. wt. ice water containing 0.1-3 pts. wt. hydrogen peroxide solution with concentration of 30%, centrifuging for 1 hour, obtaining extract, dissolving obtained product in 10-100 pts. wt. deionized water, centrifuging for 1 hour, dissolving resultant product in 10-100 pts. wt. hydrochloric acid with concentration of 10-35%, centrifuging for 1 hour, dissolving resultant product in 10-100 pts. wt. ethanol, centrifuging for 1 hour, repeating the processes for 3-10 times, drying, obtaining graphene oxide, dispersing 1 pt. wt. graphene oxide in 30-1000 pts. wt. deionized water, stirring for 20-150 minutes, ultrasonically frequency at 10-100 KHz for 20-600 minutes, centrifuging for 10-120 minutes, obtaining graphene oxide dispersion liquid, mixing 1 pt. wt. graphene oxide dispersion liquid and 0.001-0.1 pt. wt. siloxane, heating to 60-180 degrees C, heat-preserving for 1-48 hours, obtaining silica hybrid graphene gel, drying, adding obtained product to cracking furnace, introducing inert gas, heating at 1000-2000 degrees C for 0.5-10 hours, and cooling.