Nanometer magnesium hydride hydrogen-storage material preparation method

Abstract

The invention belongs to the technical field of nanomaterial preparation and discloses a nanometer magnesium hydride hydrogen-storage material preparation method. By adoption of a thermal field assisted mechanical ball milling process, alkane solution of dibutyl magnesium is subjected to wet ball milling for 1-4h under a condition of heating at 100-200 DEG C to obtain magnesium hydride suspension,and the magnesium hydride suspension is dried to obtain magnesium hydride in a nanometer structure. The particle size of the obtained magnesium hydride is generally smaller than 10nm, size uniformityis achieved, and the hydrogenation and dehydrogenation temperature of nanometer magnesium hydride is sharply lowered. The nanometer magnesium hydride preparation process is convenient and simple in operation, low in time consumption and low in operating temperature; problems of high time consumption or high operating temperature and large grain size of hydrides in previous preparation of nanometer magnesium hydride are solved; in addition, the hydrogen storage performance of magnesium hydride is improved, and a promising application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, in particular to a nanometer metal magnesium-based hydride material, which is a kind of nanometer material with better hydrogen storage performance. Background technique [0002] As a renewable and clean secondary energy source, hydrogen energy has many advantages, but its storage and transportation technology greatly limits its practical application. Compared with hydrogen storage in high-pressure gas cylinders or low-temperature liquid hydrogen storage, solid-state hydrogen storage has the advantages of high energy density, high safety, and high efficiency, and is considered to be the most promising hydrogen storage method. Magnesium hydride has a high hydrogen storage capacity (theoretical capacity is 7.6wt%), and at the same time, magnesium resources are abundant and low in cost, so it is one of the ideal solid-state reversible hydrogen storage materials, but the dehydr...

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Problems solved by technology

These preparation methods have their own characteristics and advantages, but there are also some disadvantages, such as the ball milling process is simple, but the general high-energy ball milling can achieve a grain size of more than 20nm and a particle size of more than 100nm even if the ball milling is as long as 100 hours. The nano-magnesium hydride usually only improves the kinetic properties and has little influence on the thermodynamic properties; the product obtained by the deposition method is high in purity, but usually the overall hydrogen storage capacity of the material is very low due to the existence of the substrate; the product produced by the plasma method The efficiency is high, but the equipment requirements are relatively high and the cost is expensive; the magnesium hydride nanoparticles prepared by the organic solution pyrolysis method have uniform size, good particle shape, and strong controllability, but generally require high temperature and long time for pyrolysis. It needs to be heated at 200°C for 24 hours, the product grain size is large (greater than 30nm), or graphene is required for loading

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