▎ 摘　　要

NOVELTY - Graphene synergistic photothermal energy storage composite material comprises trifluoromethylated azobenzene and reduced graphene oxide. The graphene synergistic photothermal energy storage composite material is prepared by grafting trifluoromethylated azobenzene on the surface of the reduced graphene oxide sheet in covalent coupling manner. USE - The graphene synergistic photothermal energy storage composite material is useful in solar energy storage device (claimed), and in the field of solar energy utilization and light-to-heat conversion. ADVANTAGE - The graphene synergistic photothermal energy storage composite material has at least low-temperature exothermic performance, excellent energy storage density, low-temperature heat release and energy density. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing graphene synergistic photo-thermal composite energy storage material comprising (i) uniformly dispersing the trifluoromethylated azobenzene in the dilute sulfuric acid aqueous solution, adding sodium nitrite under the low temperature condition, and dispersing to obtain azobenzene diazonium salt solution, and (ii) dispersing the above-mentioned azobenzene diazonium salt solution in the reduced graphene oxide aqueous solution, stirring and reacting to obtain graphene-enhanced photothermal composite energy storage material.