Preparation method of magnesium-based hydrogen storage material wrapped by rare earth oxide and nano boron nickel

Abstract

The invention relates to metal material hydrogen storage technology, and aims to provide a preparation method of a magnesium-based hydrogen storage material wrapped by rare earth oxides and nano boron nickel. Including: adding sodium borohydride alkali solution dropwise to a mixed solution containing rare earth and nickel, nickel is reduced to form nano-amorphous boron-nickel, and at the same time, the alkali solution increases the pH value of the solution to produce colloidal precipitation of rare earth hydroxide, thereby forming Rare earth hydroxide gel doped with nano-amorphous boron and nickel; the gel is vacuum-dried and dehydrated at high temperature to obtain nano-boron-nickel composite material supported by rare earth oxide; it is mixed with magnesium hydride and ball-milled , Magnesium hydride is dehydrogenated to metal magnesium, and then the product is obtained. The present invention avoids the formation of magnesium-nickel alloy, and the rare earth oxide keeps stable existence so as to keep the stable performance. It is beneficial to reduce the hydrogen discharge temperature and increase the hydrogen discharge speed. Reduce the hydrogen absorption temperature of the rare earth magnesium alloy and accelerate the hydrogen absorption speed. It can be used as a large-capacity hydrogen storage medium for the manufacture of portable power sources for commercial applications.

Description

technical field [0001] The invention relates to metal material hydrogen storage technology, in particular to a preparation method of a magnesium-based hydrogen storage material modified by rare earth oxide, amorphous nano-boron nickel and Grignard reagent. Background technique [0002] Hydrogen energy is clean, environmentally friendly, and renewable, and is considered to be the most ideal secondary energy source in the 21st century. Proton exchange membrane-electrolyte fuel cell (PEMFC) technology has become increasingly mature. There are two types of storage of hydrogen as a fuel cell fuel, physical method and chemical method. Physical methods mainly include: liquid hydrogen storage, high-pressure hydrogen storage, glass microsphere storage, underground cavern storage, activated carbon adsorption storage, and carbon nanotube storage (including some chemical adsorption storage). Chemical methods mainly include: metal hydride storage, organic liquid hydride storage, inorgan...

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Problems solved by technology

Although this layer of dense oxide film prevents the further oxidation of metal magnesium and plays a role of surface protection, it also hinders the permeability of hydrogen, resulting in difficult activation, slow hydrogen absorption and desorption rate of metal magnesium, and the actual hydrogen absorption and desorption temperature is relatively high. High, which seriously hinders the process of its practical application

The main methods to improve the hydrogen absorption and desorption performance of magnesium are: first, alloying, which catalyzes the hydrogen absorption and desorption reaction by adding alloy elements, but this usually leads to an increase in the alloy density and a decrease in the hydrogen storage capacity

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