▎ 摘　　要

NOVELTY - Preparation of metal composite material involves preparing (1) graphene oxide having large diameter by subjecting the graphite flake to modified Hummers method, adding (2) deionized water to obtain a graphene oxide aqueous dispersion, adding 0.55 g nickel source, 12-30 g reducing agent (A) and 10-30 ml 1 M sodium hydroxide, washing the product, removing impurities with deionized water and ethanol, drying to obtain nickel/reduced graphene oxide, and adding (iii) deionized water to prepare nickel/reduced graphene oxide aqueous solution, ultrasonically processing, adding 0.2-0.8 g copper source for each 100 ml nickel/reduced graphene oxide aqueous solution, stirring, adding 10-30 ml 1 M sodium hydroxide solution, separating the stirred precipitate, re-dispersing into deionized water, ultrasonically processing, slowly adding 2-8 g reducing agent (B), filtering the obtained product, washing, drying and obtaining copper-doped-nickel/reduced graphene oxide nanocomposite. USE - Preparation of metal composite material used as catalyst. ADVANTAGE - The process is economical, and highly improves the performance of the composite material as catalyst. DETAILED DESCRIPTION - Preparation of metal composite material involves preparing (1) graphene oxide having large diameter by subjecting the graphite flake to modified Hummers method for 1st order intercalation, adding (2) deionized water to the prepared graphene oxide to obtain a graphene oxide aqueous dispersion having a concentration of 0.5-2 mg/ml, adding 0.55 g nickel source for each 100 ml graphene oxide aqueous dispersion, increasing the temperature to 70-85 degrees C, slowly adding 12-30 g reducing agent (A), stirring for 20-40 minutes, slowly adding 10-30 ml 1 M sodium hydroxide solution, stirring for 1.5-3 hours, washing the product with deionized water and ethanol to remove impurities, drying to obtain a nickel/reduced graphene oxide, and adding (3) deionized water to the nickel/reduced graphene oxide to prepare nickel/reduced graphene oxide aqueous solution having a concentration of 0.5-4 mg/ml, ultrasonically-processing the solution, adding 0.2-0.8 g copper source for each 100 ml nickel/reduced graphene oxide aqueous solution, stirring for 10-30 minutes, adding 10-30 ml 1 M sodium hydroxide solution, adjusting the pH, stirring at room temperature for 10-30 minutes, separating the stirred precipitate, re-dispersing into deionized water, ultrasonically processing, slowly adding 2-8 g reducing agent (B), stirring for 20-40 minutes, filtering the obtained product, washing, and drying at room temperature to obtain copper-doped-nickel/reduced graphene oxide nanocomposite.