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

Abstract

The invention relates to a metal material hydrogen storage technology, and provides a preparation method of a magnesium-based hydrogen storage material coated by rare earth oxide and nano boron nickel. The preparation method comprises the following steps of dropwise adding sodium borohydride alkali liquor into a mixed solution containing rare earth and nickel, reducing the nickel to form nano amorphous boron-nickel, meanwhile, enabling the pH value of the solution to rise by the alkali liquor to generate rare earth hydroxide colloidal precipitate, then forming nano amorphous boron-nickel doped rare earth hydroxide gel, carrying out vacuum drying treatment on the gel, carrying out high-temperature drying dehydration to obtain a rare earth oxide supported nano boron-nickel composite material, mixing and ball-milling the rare earth oxide supported nano boron-nickel composite material with magnesium hydride, and dehydrogenating the magnesium hydride into magnesium metal, and obtaining the magnesium-based hydrogen storage material. Formation of magnesium-nickel alloy is avoided, and rare earth oxide remains stable, so that performance stability is kept; the hydrogen desorption temperature is reduced, and the hydrogen desorption speed is increased; the hydrogen absorption temperature of rare earth magnesium alloy is reduced and the hydrogen absorption speed is accelerated; the material can be used as a high-capacity hydrogen storage medium for manufacturing a portable power supply for commercial application.

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...

AI Technical Summary

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

Images