▎ 摘　　要

NOVELTY - A composite graphene aerogel electrode comprises aerogel doped with at least two elements of nitrogen, boron and sulfur, and is formed into an atomic bridge layered porous structure by forming carbon-boron bond, nitrogen-boron bond, and carbon-sulfur bond, in the graphene structure, and has specific capacitance of 450 F.g-1. USE - Composite graphene aerogel electrode for flexible supercapacitor (claimed), and supercapacitor current collector. ADVANTAGE - The composite graphene aerogel electrode has excellent electrochemical activity, mechanical stability due to the strong recovery elasticity of the graphene porous structure, and has specific capacitance of 450 F.g-1, when used in supercapacitor current collector under current density of 2 A.g-1. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite graphene aerogel electrode, which involves cleaning electrode substrate to remove surface impurities and oil stains, preparing graphene oxide solution, adding at least two of ammonia, thiourea and boric acid to the graphene oxide solution to obtain a mixed solution, adding the mixed solution to reaction kettle, placing in an oven for hydrothermal reaction to obtain graphene hydrogel, preparing mixed dialyzate of ethanol and water, immersing the graphene hydrogel in the dialysate for dialysis, freezing the graphene hydrogel, naturally drying to obtain graphene aerogel, fixing the graphene aerogel on the electrode substrate, and drying to obtain composite graphene aerogel electrode.