▎ 摘　　要

NOVELTY - Preparation of cobalt-graphene composite material, involves adding alkali to graphene oxide dispersion, adjusting obtained solution pH to alkaline, warming at 25 degrees C, adding cobalt complex aqueous solution and dispersant to obtained mixture, stirring for 5-10 minutes, adding reducing agent to stirred mixture, reacting for 60 minutes and separating obtained reaction product. USE - Preparation of cobalt-graphene composite material. ADVANTAGE - The method enables preparation of cobalt-graphene composite material with high efficiency. The preparation method is simple and economical. The cobalt-graphene composite material effectively absorbs electromagnetic waves.