▎ 摘　　要

NOVELTY - A nickel-doped cobalt selenide-graphitic carbon nitride heterojunction photocatalytic hydrogen production composite catalyst comprises graphitic carbon nitride modified graphene, cobalt nitrate, nickel nitrate, sodium selenite, hydrazine hydrate, cobalt nitrate, and nickel nitrate. The ratio of sodium selenite and hydrazine hydrate is 7.5-9.5:0.5-2.5:20:60-100. USE - Nickel-doped cobalt selenide-graphitic carbon nitride heterojunction photocatalytic hydrogen production composite catalyst. ADVANTAGE - The method accelerates the separation of photogenerated electrons and holes, uses graphene with excellent conductivity to form three-dimensional conductive network which promote the migration of photogenerated electrons to graphene and inhibit the recombination of photogenerated electrons and holes, makes the light absorption edge of graphitic carbon nitride redshift, reduces the energy of photogenerated electrons from the graphitic carbon nitride valence band to guide band, and reduces the band gap of composite catalyst. The composite catalyst exhibits excellent photocatalytic hydrogen production activity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite catalyst comprising adding graphitic carbon nitride modified graphene, cobalt nitrate, nickel nitrate, sodium selenite and hydrazine hydrate to mixed solvent of distilled water and diethylenetriamine at volume ratio of 1.5-2.5:1, pouring to hydrothermal reactor, placing reactor to heating box, heating to 140-180 degrees C for 15-25 hours, filtering, washing, and drying.