▎ 摘　　要

NOVELTY - A composite material comprises cerium oxide, iron oxide, oriented carbon nanotubes, and graphene. The oriented carbon nanotubes and graphene form an aerogel, and cerium oxide and iron oxide are doped or embedded in it. USE - Composite material with hydrogen production and hydrogen storage function. ADVANTAGE - A synergistic effect between the different components of the composite material, and the oriented carbon nanotubes/graphene can improve the photocatalytic performance of cerium oxide/iron oxide, thereby improving the hydrogen production efficiency. The composite materials have low mass density and high chemical stability when used as hydrogen storage materials, and doping or intercalating metal oxides ceria and iron oxide in carbon nanotubes and graphene can enhance hydrogen adsorption capacity, improve hydrogen storage performance and realize the integration of hydrogen production and hydrogen storage functions. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation of a composite material having both hydrogen production and hydrogen storage functions, which involves (1) adding expandable graphite into a soluble cerium salt solution, then adding a soluble iron salt solution into the cerium salt solution containing expandable graphite, and evaporating the solution moisture to obtain a solid mixture, (2) carrying out instantaneous high temperature reaction with the solid mixture obtained in step (1) to obtain cerium oxide/iron oxide/expanded graphite composite material, (3) ultrasonically peeling the cerium oxide/iron oxide/expanded graphite composite material obtained in step (2) in water, and adding a surfactant to the water to obtain a cerium oxide/iron oxide/graphene mixed solution, (4) adding the cerium oxide/iron oxide/graphene mixed solution obtained in step (3) into the oriented carbon nanotube aqueous dispersion, stirring evenly, and freeze-drying.