Magnesium-based hydrogen storage alloy with long period structure and preparation method thereof

A magnesium-based hydrogen storage alloy and long-period structure technology, applied in the field of hydrogen storage materials, can solve the problems of slow hydrogen desorption kinetics, high hydrogen desorption temperature, etc., achieve good hydrogen storage performance, increase hydrogen desorption speed, and simple preparation process Effect

Active Publication Date: 2012-02-01
SOUTH CHINA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Although these methods can improve the hydrogen storage properties of alloys to varying degrees, the slow hydrogen desorption kinetics and high dehydrogenation temperature are still key issues to be solved.

Method used

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  • Magnesium-based hydrogen storage alloy with long period structure and preparation method thereof
  • Magnesium-based hydrogen storage alloy with long period structure and preparation method thereof
  • Magnesium-based hydrogen storage alloy with long period structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The alloy ingot is sawed into small squares with an electric saw, the oxide layer on the surface of the alloy is removed with a grinding wheel and sandpaper, cleaned and dried in time, and the square is broken into fine granular alloys by mechanical crushing.

[0038] In a glove box with an argon atmosphere, put the alloy prepared above into a ball mill jar, and under the protection of an argon atmosphere, use a planetary high-energy ball mill to perform powerful ball milling. The ball milling time is 2 hours, the ball-to-material ratio is 20:1, and the speed is 400r. / min to obtain a magnesium-based hydrogen storage alloy.

[0039] The hydrogen absorption and desorption performance of the alloy is very good: as figure 1 As shown, the alloy has good hydrogen absorption and desorption cycle performance at 350°C, 300°C, and 250°C, and the hydrogen absorption capacity can reach about 5.8%; figure 2 As shown, the hydrogen absorption capacity of the alloy reaches 3% in 30...

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Abstract

The invention provides a magnesium-based hydrogen storage alloy with a long period structure and a preparation method thereof. The magnesium-based hydrogen storage alloy has the chemical composition of Mg100-(2x-4x)Nix-3xYx (x is not less than 2 and not more than 6), and has a 18R and 14H long period stacking ordered structure. The preparation method comprises the following steps of: taking pure magnesium and Ni-Y intermediate alloys according to the chemical composition, carrying out induction smelting to obtain magnesium-based alloy cast ingots, mechanically crushing, and then carrying out high-energy mechanical milling to finally obtain the magnesium-based hydrogen storage alloy. The magnesium-based hydrogen storage alloy provided by the invention has good activation property and hydriding/dehydriding kinetics property; Ni atoms and Y atoms in the long period structure form Mg2NiHx and YH2-3 in the hydriding process and are evenly distributed among Mg particles in nanoscale, therefore, the hydrogen storage property of the Mg-based hydrogen storage alloy is greatly improved. The preparation method provided by the invention is simple and applicable to industrialized production.

Description

technical field [0001] The invention relates to a hydrogen storage material, in particular to a magnesium-based hydrogen storage alloy with a long-period structure and a preparation method thereof. Background technique [0002] my country's current rapid economic development has greatly increased the demand for energy, but the energy structure system is still dominated by fossil fuels such as coal, oil, and natural gas, and the large-scale use of fossil fuels has caused serious environmental pollution problems. At the same time, due to the non-renewability of fossil fuels, there will be a more serious energy crisis. Therefore, the development of new energy and clean new energy is the only way for the sustainable development of the world. Among many new energy sources, hydrogen energy has incomparable advantages. [0003] The key technical issue of hydrogen storage lies in hydrogen storage, and the metal hydride hydrogen storage technology is the most researched at present....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03B22F9/04
Inventor 刘江文邹长城王辉欧阳柳章朱敏
Owner SOUTH CHINA UNIV OF TECH
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