▎ 摘　　要

NOVELTY - Preparing multi-element doped three-dimensional porous graphene air gel comprises (i) dispersing ultrasonic graphite oxide in water to obtain oxidized graphene solution, (ii) adding graphene oxide solution obtained in step (i), ion liquid, and evenly mixing to obtain graphene oxide and ionic liquid, (iii) freezing and drying the mixed solution obtained in step (ii) to obtain graphene oxide gel, (iv) calcining step (iii) graphene oxide gel at high temperature under inert gas atmosphere to obtain multi-element doped three-dimensional porous graphene gas gel. USE - The method is useful for preparing multi-element doped three-dimensional porous graphene air gel (claimed). ADVANTAGE - The graphene air gel has porous gas gel structure, large specific surface area; and the method is simple and low cost.