▎ 摘　　要

NOVELTY - A cobalt-doped nitrogen-doped graphene oxide-nickel phosphide(I)-nickel phosphide (II)/nickel-cobalt foam composite electrode material is obtained by growing nitrogen-doped graphene oxide-coated cobalt-doped nickel phosphide (I)-nickel phosphide (II) composite phosphide nanorod assemblies in situ on nickel-cobalt foam (NCF) metal sheet current collectors, connecting the composite phosphide nanorods to each other and growing to form a sheet-like network structure, and performing pyrolysis, carbonization and phosphating reactions in one step by coating the liquid precursor on the pretreated foamed nickel-cobalt metal sheet under the protection of aluminum foil and nitrogen atmosphere. USE - Cobalt-doped nitrogen-doped graphene oxide-nickel phosphide-nickel phosphide/nickel-cobalt foam composite electrode material. ADVANTAGE - The composite electrode material has high electro-catalytic hydrogen evolution efficiency in 1mol L-1KOH solution, high catalytic activity and selectivity, and high stability. DETAILED DESCRIPTION - A cobalt-doped nitrogen-doped graphene oxide-nickel phosphide of formula: Ni12P5 (I)-nickel phosphide of formula: Ni3P (II)/nickel-cobalt foam (NCF) composite electrode material is obtained by growing nitrogen-doped graphene oxide-coated cobalt-doped nickel phosphide (I)-nickel phosphide (II) composite phosphide nanorod assemblies in situ on nickel-cobalt foam (NCF) metal sheet current collectors, connecting the composite phosphide nanorods to each other and growing to form a sheet-like network structure, and performing pyrolysis, carbonization and phosphating reactions in one step by coating the liquid precursor on the pretreated foamed nickel-cobalt metal sheet under the protection of aluminum foil and nitrogen atmosphere. The preparation involves (i) pretreating foamed nickel-cobalt metal sheets by cutting the foamed nickel-cobalt metal sheet into square pieces of 1cm x 1cm size, putting into acetone and soaking in ultrasonic for 5 minutes, putting into 1 mol/L dilute hydrochloric acid for ultrasonic soaking for 5 minutes, taking out the foamed nickel-cobalt, washing three times with deionized water and absolute ethanol respectively, and driying in a vacuum drying oven at 40degrees Celsius, (ii) mixing 0.001-0.1 mol methoxymethyltriphenylphosphonium chloride, 0.001-0.05 mol urea and 0.001-0.05 mol ethylene glycol, stirring at 30-90degrees Celsius to form a transparent liquid, and (iii) coating the transparent liquid on the pretreated foamed nickel-cobalt metal sheet, wrapping with aluminum foil, heating to 300-650degrees Celsius under the protection of nitrogen atmosphere, maintaining for 1-5 hours and cooling.