▎ 摘　　要

NOVELTY - Preparing reduced graphene film involves using polyvinyl alcohol as an additive, reducing graphene oxide with metal, and then forming a layer of graphene film uniformly on the metal surface. USE - Method for preparing a reduced graphene film used as an active material for energy storage, preferably lithium-ion battery, supercapacitor, micro-nano electronic device, and integrated circuit (all claimed). ADVANTAGE - The method is green and eco-friendly without using toxic and harmful reducing agent, and prepares the film thickness by controlling the reaction time and the temperature at a lower temperature. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the graphene preparation to any one of said claim.