Metal oxide and porous material composite hydrogen storage material and preparation method thereof

Abstract

The invention belongs to the technical field of hydrogen storage materials and particularly relates to a metal oxide and porous material composite hydrogen storage material and a preparation method thereof. The metal oxide and porous material composite hydrogen storage material is formed by compounding magnesium hydride, a porous material and a metal oxide, and the weight ratio of the magnesium hydride to the porous material to the metal oxide is (100-10): (5-0.1): (1-0.05). The magnesium hydride is taken as a base material, and metal oxide particles are mixed and grinded to obtain an activated magnesium hydride material; and the obtained activated magnesium hydride material is mixed with the porous material, and ball milling or compression is carried out to obtain the composite hydrogen storage material. According to the material and the preparation method, nanoscale metal oxide particles are added and compounded with the porous material, so that the hydrogenation speed of magnesium-based composite powder in the hydrogen charging ball milling process can be increased, and meanwhile, the hydrogen storage material has good characteristics in the aspects of hydrogen adsorption and desorption kinetics in combination with the properties such as excellent pore channels and high surface area of the porous material.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, and in particular relates to a metal oxide and porous material composite hydrogen storage material and a preparation method thereof. Background technique [0002] So far, the metal hydrogen storage materials that have been studied more mainly include: (1) LaNi 5 The rare earth system represented by AB 5 type alloy; (2) AB type hydrogen storage alloy represented by TiFe, (3) type ZrV 2 Department represented by AB 2 Type Laves phase hydrogen storage alloy; (4) LaNi 3 A new type of AB represented by 3 Type hydrogen storage alloy; (5) with Mg 2 A represented by Ni 2 Type B hydrogen storage alloy. Although LaNi 5 Type and LaNi 3 Type alloys have excellent hydrogen absorption and desorption kinetics and low hydrogen absorption and desorption temperature, but their hydrogen absorption weight is relatively low (only about 1.5%); TiFe series is 1.8-2.2wt%, and the activation p...

AI Technical Summary

Problems solved by technology

However, magnesium has not been used in practice due to its high hydrogen absorption and desorption temperature and poor kinetic properties.

Chinese patent CN1204282C discloses a material with a high hydrogen storage capacity. Although the hydrogen charging and discharging kinetics and thermodynamic performance of pure magnesium hydrogen storage materials have been improved to a certain extent, due to the addition of nickel that does not absorb hydrogen, resulting in Its hydrogen absorption capacity is reduced, and because nickel is relatively expensive, the cost of materials is increased