Method for nanocrystallization of magnesium-based hydrogen storage material

Abstract

The invention relates to a method for the nanocrystallization of a magnesium-based hydrogen storage material, which utilizes a nanocrystallization process for a nano-carbon material to prepare the magnesium-based hydrogen storage material to form monocrystal or polycrystal nano-particles so as to improve a specific surface area greatly and increase diffusion channels of hydrogen atoms in the hydrogen storage material. Therefore, the method can improve the effective hydrogen capacity of the hydrogen storage material, accelerate the hydrogen absorption and desorption of the hydrogen storage material, and reduce the temperature of the hydrogen absorption and desorption of the hydrogen storage material.

Description

technical field [0001] The present invention relates to a magnesium-based hydrogen storage material, more particularly to a method for nanometerizing a magnesium-based compound. Background technique [0002] In the research of hydrogen storage materials, in order to increase the effective hydrogen storage capacity, accelerate the rate of hydrogen absorption and desorption, and reduce the temperature of hydrogen absorption and desorption, nanotization of materials is a new research direction. At present, it is difficult to mechanically nanonize ductile materials such as magnesium-based compounds or added high-hardness materials, because the size of the grinding ball is not nano-scale and the relative size of the abrasive material is too large, so it is difficult to apply nano-scale stress on the above materials. For ductile materials, although ball milling can destroy the material, the damaged material is easy to recrystallize into a larger size, so it cannot effectively red...

AI Technical Summary

Problems solved by technology

At present, it is difficult to mechanically nanonize ductile materials such as magnesium-based compounds or added high-hardness materials, because the size of the grinding ball is not nano-scale and the relative size of the abrasive material is too large, so it is difficult to apply nano-scale stress in the above material

For ductile materials, although ball milling can destroy the material, the damaged material is prone to recrystallization into larger sizes, so it cannot effectively reduce its crystal size to nanoscale

In order to avoid the recrystallization phenomenon, it is known to use liquid nitrogen to reduce the ductility of ductile materials such as aluminum-based compounds, but the above cryogenic grinding process will increase the cost

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