▎ 摘　　要

NOVELTY - Preparing polyimide-based composite carbon aerogel involves ultrasonically dispersing graphene oxide in deionized water to obtain stable aqueous dispersion of graphene oxide. The carbon nanotubes are ultrasonically dispersed in acidified deionized water to obtain stabile aqueous carbon nanotube dispersion. The graphene oxide nanotubes are dispersed in acidified deionized water to obtain stable graphite oxide/aqueous carbon nanotube dispersion. The aqueous polyamic acid is dispersed to obtain graphene oxide and/or carbon nanotube/polyamic acid dispersion. USE - Method for preparing polyimide-based composite carbon aerogel used as catalyst support material, hydrogen storage material, adsorption material in super capacitor and lithium ion battery electrode material (claimed). ADVANTAGE - The method enables to prepare polyimide-based composite carbon aerogel that has high porosity and uniform size distribution. DETAILED DESCRIPTION - Preparing polyimide-based composite carbon aerogel involves ultrasonically dispersing graphene oxide in deionized water to obtain stable aqueous dispersion of graphene oxide. The carbon nanotubes are ultrasonically dispersed in acidified deionized water to obtain stabile aqueous carbon nanotube dispersion. The graphene oxide nanotubes are dispersed in acidified deionized water to obtain stable graphite oxide/aqueous carbon nanotube dispersion. The aqueous polyamic acid is dispersed to obtain graphene oxide and/or carbon nanotube/polyamic acid dispersion. The potassium hydroxide solution is added to obtained graphene oxide and/or carbon nanotube/polyamic acid dispersion and stirred by sol-gel process to obtain graphene oxide and/or carbon nanotube/polyamic acid hydrogel. The graphene oxide and/or carbon nanotube/polyamic acid hydrogel is added to the refrigerator and frozen in liquid nitrogen to obtain solid. The solid is freeze-dried in freeze-drying machine to obtain graphene oxide and/or carbon nanotube/polyamic acid aerogel referred to as GO-PAA-X, CNTs-PAA-X, GO/CNTs-PAA-X. The graphene oxide and/or carbon nanotube/polyamic acid aerogel is subjected to imidization and heated to obtain graphene oxide and/or carbon nanotubes crosslinked polyimide aerogel referred to as G-PI-X, CNTs-PI-X, G/CNTs-PI-X. The obtained polyimide-based aerogel is subjected to high temperature carbonization and activation treatment to obtain polyimide-based composite carbon aerogel having high specific surface area.