▎ 摘　　要

NOVELTY - Preparation of graphene based bi-metallic composite material, involves taking graphene oxide, deionized water, chloroplatinic acid, metal salt and radical scavenger, mixing, ultrasonically dispersing for 1-2 hours, obtaining mixture, introducing nitrogen gas to mixture, obtaining reaction solution, irradiating obtained reaction solution, obtaining composite material product, carrying out centrifugal separation of obtained composite material product, washing with deionized water and ethanol and finally drying in vacuum oven at 45-55 degrees C for 20-24 hours. USE - Preparation of graphene based bi-metallic composite material for fuel cell (claimed). ADVANTAGE - The preparation method uses low-cost magnetic metal cobalt and nickel. Bi-metallic structure is formed with precious metal platinum. The synergistic effect between the precious metal and magnetic metal is exploited. The catalytic performance is improved. The amount of precious metals is significantly reduced so as to reduce the cost. DETAILED DESCRIPTION - Preparation of graphene based bi-metallic composite material, involves taking 0.8-1.2 pts. wt. graphene oxide, 45-55 pts. wt. deionized water, 0.3-1.2 pts. wt. chloroplatinic acid, 0.3-1.2 pts. wt. metal salt and 10-20 pts. wt. radical scavenger, mixing evenly, ultrasonically dispersing for 1-2 hours under condition of 40 kHz-50 kHz, obtaining mixture, introducing nitrogen gas to mixture for 25-35 minutes, obtaining reaction solution, irradiating obtained reaction solution with 60Co for 10-36 hours, obtaining composite material product, carrying out centrifugal separation of obtained composite material product, washing with deionized water and ethanol and finally drying by vacuum oven at temperature of 45-55 degrees C for 20-24 hours. The metal salt is metal cobalt salt or metal nickel salt. Radiation dose rate is 1 kGy/hour-50 kGy/hour.