▎ 摘　　要

NOVELTY - A graphene synergistic heat-storage composite material comprises o-tetrafluoro-substituted azobenzene (I) and reduced graphene oxide. The o-tetrafluoro-substituted azobenzene is grafted on the surface of the reduced graphene oxide by covalent coupling. USE - Graphene synergistic heat-storage composite material. ADVANTAGE - The composite material has excellent performance incompletely visible light driving energy storage, fast heat release and heat storage density under low temperature condition, and uses solar energy for heat energy storage. DETAILED DESCRIPTION - A graphene synergistic heat-storage composite material comprises o-tetrafluoro-substituted azobenzene of formula (I) and reduced graphene oxide. The o-tetrafluoro-substituted azobenzene is grafted on the surface of the reduced graphene oxide by covalent coupling. An INDEPENDENT CLAIM is included for preparation of the composite material comprising uniformly dispersing diazonium salt solution of the tetrafluoro substituted azobenzene in the reduced graphene oxide and reacting, preferably mixing o-tetrafluoro-substituted azobenzene, sodium hydroxide, sodium nitrate and diluted hydrochloric acid aqueous solution and reacting to obtain diazonium salt solution of o-tetrafluoro-substituted azobenzene; and uniformly dispersing in reduced graphene oxide, stirring, and reacting.