▎ 摘　　要

NOVELTY - Preparing catalyst comprises e.g. ultrasonically mixing graphene oxide solution, urea and deionized water, pouring solution into high pressure kettle of polytetrafluoroethylene lining, reacting to obtain nitrogen-doped graphene oxide, mixing with ammonium sulfate, ultrasonically dispersing to deionized water, carrying out rotary evaporation, vacuum extracting the suspension to obtain powder, placing powder in quartz tube furnace, passing argon gas to prevent the reactant from reacting with oxygen, heating, decomposing ammonium sulfate to generate sulfur trioxide group, reducing the nitrogen-doped graphene oxide in powder to nitrogen-doped reduced graphene oxide, reacting sulfur trioxide functional groups with hydrogen atoms of reduced graphene oxide to form sulfonic acid groups grafted on reduced graphene oxide, mixing dihexachloroplatinic (IV) acid hydrate, nickel (II) nitrate hexahydrate with metal ion atoms, adding metal to ethylene glycol, reducing, washing, filtering, drying USE - The catalyst is useful for fuel cell (claimed). ADVANTAGE - The method: reduces the amount of platinum and reduces the cost, and improves the catalytic efficiency and stability of the catalyst. DETAILED DESCRIPTION - Preparing catalyst comprises (i) adding 20 ml of 8 mg/ml graphene oxide solution and 0.5-3 g urea to deionized water, ultrasonically ensuring fully mixing, pouring the solution into high pressure kettle of polytetrafluoroethylene lining for 8 hours, reacting at 180℃ for 2 hours, cooling to room temperature, washing the sample with deionized water for 3 times, drying by vacuum freeze dryer to obtain nitrogen-doped graphene oxide, (ii) mixing ammonium sulfate and nitrogen-doped graphene oxide in a mass ratio of 10-15:100, ultrasonically dispersing into deionized water under the action of ultrasonic waves, carrying out rotary evaporation, vacuum extracting the suspension in the vessel to obtain powder, (iii) placing the powder in step (ii) in a quartz tube furnace, passing argon gas to prevent the reactant from reacting with oxygen, and heating at 260℃, decomposing ammonium sulfate to generate sulfur trioxide group, reducing the nitrogen-doped graphene oxide in the powder to nitrogen-doped reduced graphene oxide during the reaction, reacting sulfur trioxide functional groups with the hydrogen atoms of reduced graphene oxide to form sulfonic acid groups grafted on reduced graphene oxide, forming the reduced graphene oxide vacancies by partial nitrogen doping are grafted with sulfate functional groups, (iv) mixing dihexachloroplatinic (IV) acid hydrate and nickel (II) nitrate hexahydrate with metal ion atoms of 1:1, adding 25 wt.% metal loading into 150 ml of ethylene glycol, and reducing at 180℃ for 2 hours under nitrogen atmosphere to obtain nitrogen-doped reduced graphene oxide-sulfonic acid supported platinum-nickel suspension, and (v) washing the suspension, filtering and drying to obtain platinum-nickel alloy grafted on the sulfonic acid functional group of the nitrogen-doped reduced graphene oxide support to obtain catalyst platinum-nickel/nitrogen-doped reduced graphene oxide-sulfonic acid (PtNi/(N)rGO-SO3H).