▎ 摘　　要

NOVELTY - A composite hydrogen storage material is obtained by doping 9-11 %mass cobalt molybdate/reduced graphene oxide nanomaterial into magnesium hydride. USE - The composite hydrogen storage material is useful for storing hydrogen used as widely distributed secondary clean energy. ADVANTAGE - The composite hydrogen storage material has excellent low-temperature absorption hydrogen dynamic performance and cycle stability, effectively improves hydrogen storage performance of magnesium hydroxide, accelerates adsorption and dissociation of hydrogen on magnesium hydride, and greatly reduces the dehydrogenation temperature of magnesium hydride. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite hydrogen storage material, which involves: (1) dissolving cobalt(II) chloride hexahydrate and ammonium molybdate tetrahydrate in a molar ratio of 1:1 in deionized water, and stirring to obtain a cobalt molybdate solution; (2) preparing graphene oxide dispersion liquid, adding to the cobalt molybdate solution, uniformly stirring to obtain a mixed solution, and adjusting the pH of the solution to 10 using a pH regulator; (3) adding homogeneous solution to a high-pressure reaction kettle for sealing and reacting at high temperature of 130±10℃, cooling to room temperature, filtering, and washing precipitate to remove unreacted impurities; (4) drying the precipitate in a drying oven, taking out the dried product, and grinding several times on a grinding bowl to obtain cobalt molybdate/reduced graphene oxide nanosheet; and (5) mixing the nanosheet and magnesium hydride in an inert atmosphere and ball milling in a ball milling jar.