A catalyst-enhanced mgal-based hydrogen storage material

Abstract

A catalyst-enhanced MgAl-based hydrogen storage material. The catalyst-enhanced MgAl-based hydrogen storage material is prepared by the following method: providing Mg and Al metal raw materials; weighing the Mg and Al metal raw materials according to a molar ratio of Mg:Al=(16-18):(11-13); carrying out first vacuum smelting on the weighed Mg and Al metal raw materials to obtain a primary Mg alloy ingot; breaking the primary Mg alloy ingot to obtain a primary magnesium alloy block; providing Ti, Zr and V metal raw materials; weighing the primary magnesium alloy block and the Ti, Zr, and V metal raw materials according to predetermined weight parts; performing ball milling on the weighed primary magnesium alloy block and Ti, Zr and V metal raw materials to obtain a composite metal powder; using a cold isostatic pressing method to press the composite metal powder into a loose alloy ingot; hot pressing the loose alloy ingot to obtain a dense alloy ingot; performing a heat treatment on the dense alloy ingot; and performing wire cutting on the heat-treated dense alloy ingot.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a catalyst-enhanced MgAl-based hydrogen storage material. Background technique [0002] Metal hydride hydrogen storage materials realize the absorption and release of hydrogen through the reversible reaction between hydrogen and metal hydride. When the hydride is heated, it decomposes into the corresponding metal phase and releases hydrogen gas. Most of the metals used to store hydrogen are alloys composed of multiple elements. At present, the alloys that have been successfully researched in the world are roughly divided into: rare earth series, magnesium series, etc. Compared with gaseous hydrogen storage and liquid hydrogen storage, metal hydride hydrogen storage has the advantages of large hydrogen storage mass density ratio, large hydrogen storage volume ratio, stable pressure, simple hydrogen filling, convenience, safety, etc. Under this condition, its density...

AI Technical Summary

Problems solved by technology

Magnesium is abundant in natural storage, low in price, and has a large application development space, but its alloy hydride (MgH2) has great obstacles in both thermodynamics and kinetics.

From the perspective of thermodynamics, the enthalpy of formation of MgH2 is higher; from the perspective of kinetics, the activation energy of MgH2 dehydrogenation is high, and the rate of hydrogen desorption is slow at lower temperatures