▎ 摘　　要

NOVELTY - Preparing graphene quantum dot airgel derived porous carbon comprises adding coal powder to mixed acid solution, refluxing under heating and cooling down to obtain black-brown mixed solution, obtaining supernatant solution and black precipitate after diluting, separating and filtering black-brown mixed solution, dialyzing supernatant solution to neutrality, concentrating and drying to obtain coal-based graphene-based quantum dots, adding coal-based graphene-based quantum dots to acetic acid solution, uniformly dispersing to obtain mixed solution, heating mixed solution and under condition of heat preservation, adding hydrophilic colloid until hydrophilic colloid is completely dissolved and cooling, adding pore-forming agent under stirring conditions, mixing solution to form foam gel, freeze-drying foam gel to obtain graphene quantum dot airgel, and preparing graphene airgel-derived porous carbon by calcining the graphene quantum dot airgel at high temperature of 700-900℃. USE - The dot airgel is useful for preparing supercapacitor electrodes (claimed). ADVANTAGE - The dot airgel: has three-dimensional porous structure; provides high porosity and large specific surface area for supercapacitors; and solves the problems that graphene is easy to stack and difficult to disperse, which inhibits electrochemical activity.