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

A technology of rare earth oxides and rare earth hydroxides, applied in chemical instruments and methods, reactant parameter control, hydrogen, etc., can solve the problems of slow hydrogen absorption and desorption of metal magnesium, hindering the practical process, hindering hydrogen permeability, etc. , to achieve the effect of accelerating the hydrogen absorption rate, reducing the activation energy of the hydrogen absorption reaction of magnesium, and reducing the activation energy of the hydrogen desorption reaction

Active Publication Date: 2021-04-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Embodiment 1

[0025] Embodiment 1: mixed nitrate solution preparation

[0026] Dissolve 1 mole of nickel nitrate and 0.5 mole of lanthanum nitrate in 1.8 liters of deionized water at a molar ratio of 1:0.5:100 to form a nickel and lanthanum nitrate solution.

Embodiment 2

[0027] Embodiment 2: the formation of nanometer amorphous boron nickel

[0028] Dissolve 1 mole of nickel nitrate and 1 mole of cerium nitrate in 1.8 liters of deionized water at a molar ratio of 1:1:100 to form a nickel and cerium nitrate solution. 0.25 mole of sodium borohydride (9.45 g) was dissolved in 463.05 g of 10 wt % NaOH solution to obtain a lye solution containing 2 wt % sodium borohydride. Sodium borohydride lye is added dropwise to the nitrate solution of nickel and cerium, and the nickel in the solution is reduced to form nano boron nickel.

Embodiment 3

[0029] Embodiment 3: Preparation of nano-amorphous boron-nickel-doped lanthanum hydroxide gel

[0030] Dissolve 1 mole of nickel nitrate and 1 mole of lanthanum nitrate in 1.8 liters of deionized water at a molar ratio of 1:1.5:100 to form a nickel and lanthanum nitrate solution. 0.4 mole of sodium borohydride (15.12 g) was dissolved in 488.88 g of 10 wt % NaOH solution to obtain a lye solution containing 3 wt % sodium borohydride. Sodium borohydride lye is added dropwise to the nitrate solution of nickel and lanthanum, and the nickel in the solution is reduced to form nano-amorphous boron-nickel. Nano-amorphous boron-nickel doped lanthanum hydroxide gel.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C23/00C22C32/00C01B3/00H01M8/04082
CPCC01B3/0057C01B3/0078C22C1/1084C22C23/00C22C32/0036H01M8/04216Y02E60/32Y02E60/50
Inventor 刘宾虹高子钧李洲鹏
Owner ZHEJIANG UNIV
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