▎ 摘　　要

NOVELTY - High energy density graphene aerogel preparation involves mixing water and an acid-containing graphene oxide dispersion under ultrasonication to prepare acid-free graphite oxide by using modified Hummers method. The prepared pure graphite oxide is added to water to obtain a graphene oxide dispersion. The obtained acid-containing graphene oxide dispersion and the obtained graphene oxide dispersion are separately placed in a reaction vessel to carry out water under thermal reaction conditions to obtain columnar graphene hydrogel. The obtained columnar graphene hydrogels are placed in liquid nitrogen for freezing for 5-30 minutes, and then placed in a lyophilizer to freeze-dry to obtain the graphene aerogel. USE - Method for preparing high energy density graphene aerogel. ADVANTAGE - The method prepares the high energy density graphene aerogel in a simple, cost-effective and eco-friendly manner with high efficiency and controllable conditions. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the scanning electron micrograph of the prepared graphene aerogel.