▎ 摘　　要

NOVELTY - Hydrogen-accumulating materials comprise 97-75 wt.% magnesium hydride and 3-25 wt.% nickel-graphene hydrogenation catalyst which is a nickel nanoparticle of size 1-10 nm and uniformly fixed on the graphene surface. USE - Used as hydrogen-accumulating materials. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for production of magnesium hydride-accumulating composites, comprising mechanochemical treatment of metallic magnesium with a catalyst at room temperature and a hydrogen pressure of 10-30 atm, where a nickel-graphene composite is used as the catalyst at 3-25 wt.% of the total amount of material.