▎ 摘　　要

NOVELTY - Composition (C1) comprises reduced graphene oxide in the form of sheets that are interconnected to define pores between the sheets. USE - The composition is useful in an electrode for a supercapacitor (all claimed). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a freestanding film comprising graphene oxide and having a thickness of at least 15 mm; (2) a composition (C2) comprising reduced graphene oxide produced by rapid heating of the film; (3) a slurry comprising the reduced graphene oxide and a carrier; (4) an electrode comprising a layer of the composition and a conductive substrate; (5) reducing (P1) graphene oxide, comprising rapidly heating a freestanding film comprising graphene oxide; (6) preparing (P2) the electrode, comprising rapidly heating a freestanding film comprising graphene oxide to form a film comprising reduced graphene oxide, processing the film comprising reduced graphene oxide to form a powder, dispersing the powder in a carrier comprising an organic solvent to form a slurry, applying the slurry to a conductive substrate to form a wet layer, and removing carrier from the wet layer to form a dried layer; and (7) preparing (P3) a freestanding film comprising graphene oxide, comprising mixing graphene oxide and water to form a suspension, coating the suspension on a substrate to form a layer comprising graphene oxide, drying the layer to remove the carrier, and removing the layer from the substrate.