▎ 摘　　要

NOVELTY - A composite material comprises graphene and reduced graphene oxide laminated by smoothing action. USE - Composite material is used for forming electrode of electrical element e.g. supercapacitor, secondary battery, fuel cell and solar cell (all claimed). ADVANTAGE - The composite material has excellent stability and high porosity characteristics, and can be manufactured by simple process. The battery provided with composite material-based electrode has improved power density. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) electrode, which comprises a collector, and the composite material deposited on the collector; and (2) manufacture of composite material, which involves dispersing graphite powder and graphene oxide in azeotropic mixture comprising ethanol and water, mixing, freeze-drying resultant mixture and reducing graphene oxide.