▎ 摘　　要

NOVELTY - Preparation of copper sulfide and titanium dioxide nanotubes/graphene composite material involves pre-oxidizing graphite using a strong protonic acid, adding a strong oxidant, cooling, diluting, centrifuging, obtaining graphene oxide dispersion, filtering, drying, obtaining graphene oxide powder, mixing titanium dioxide P25 nanoparticles, an alkali solution, an alcohol and graphene oxide powder, cooling, separating, obtaining precipitate, calcining, obtaining a titanium dioxide nanotubes/graphene composite, adding a copper chloride and sodium thiosulfate mixed solution, and heating. USE - Preparation of copper sulfide and titanium dioxide nanotubes/graphene composite material used as cathode material of solar cell, and used in photocatalysis and solar water splitting applications. ADVANTAGE - The method enables simple and economical preparation of environmentally-friendly copper sulfide and titanium dioxide nanotubes/graphene composite material having excellent absorption effect, with low equipment requirement. DETAILED DESCRIPTION - Preparation of copper sulfide and titanium dioxide nanotubes/graphene composite material involves pre-oxidizing graphite using a strong protonic acid, forming a graphite intercalation compound, adding a strong oxidant for oxidation, forming hydrophilic graphite oxide, cooling, diluting, centrifuging, obtaining stable graphene oxide dispersion, filtering, drying, obtaining graphene oxide powder, mixing titanium dioxide P25 nanoparticles, an alkali solution with concentration of 5-20 mol/L, an alcohol as an organic solvent, and graphene oxide powder, forming a mixed solution, transferring resultant product to a reactor, sealing the reactor, cooling to room temperature, separating, obtaining white precipitate, washing, calcining, obtaining titanium dioxide nanotubes/graphene composite material, adding resultant product to a mixed solution of copper chloride and sodium thiosulfate in a high-pressure reactor, sealing, placing the reactor in a furnace, and heating at 60-120 degrees C for 1-24 hours. The concentration of copper chloride and sodium thiosulfate is 0.0025-0.01 mol/L, each.