▎ 摘　　要

NOVELTY - A composite material comprises graphene sheet and cobalt sulfide adhered to a surface of graphene sheet, and has layered structure. The molar ratio of graphene and cobalt sulfide is 1:(5-7). USE - Composite material is used in hydrogen-storage application (claimed). ADVANTAGE - The composite material has maximum hydrogen storage capacity of 3.73 wt.% or less. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of composite material, which involves mixing cobalt powder and sulfur powder in molar ratio of 1:(0.9-1.1), obtaining mixed powder (a), mixing zirconia balls and the mixed powder (a) in mass ratio of (10-15):1, ball milling in a ball milling tank for 8-12 hours in high-pure argon gas atmosphere at 600-800 rpm, cooling the resultant material to room temperature, obtaining cobalt sulfide powder, adding graphene, mixing uniformly, obtaining mixed powder (b), mixing zirconia balls with mixed powder (b) in mass ratio of (15-20):1, ball milling in a ball milling tank for 8-12 hours in high-pure argon gas atmosphere at 600-800 rpm and cooling the resultant material to room temperature.