The invention relates to a thermal preparation method of a solution of a self-supported
porous graphene-based membrane, relates to a preparation method of a self-supported
porous graphene-based membrane, and aims to solve the technical problems that the size and the thickness of a conventional self-supported
porous graphene-based membrane are limited and the electrochemical performance of the conventional self-supported porous
graphene-based membrane is poor caused by severe interlay lamination of
graphene sheets in the
chemical reduction process. The thermal preparation method comprises the following steps: dispersing
graphene oxide into water, adding or not adding a
doped carbon material, concentrating, and spreading into a membrane, thereby obtaining a graphene
oxide membrane; preparing a
thermal treatment solution by using acid or alkali solute, putting the graphene
oxide membrane into a reaction kettle with a
polytetrafluoroethylene lining, adding the
thermal treatment solution according to the standard that the membrane is submerged, sealing the reaction kettle, and subsequently performing
thermal treatment, thereby obtaining the self-supported porous graphene-based membrane. The self-supported porous graphene-based membrane is prepared by orderly arranging graphene sheets in parallel, and due to the gaps among the graphene sheet
layers, the self-supported porous graphene-based membrane can be used in
electrochemical energy storage devices such as supercapacitors.