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Amorphous magnesium-aluminum-base composite hydrogen storage material and preparation method thereof

A hydrogen storage material, magnesium-aluminum-based technology, applied in the field of lightweight hydrogen storage materials, can solve the problem of high hydrogen desorption temperature of magnesium-based hydrogen storage materials, avoid weakening of diffusion capacity, refine particle/grain size, accelerate The effect of hydrogen storage process

Inactive Publication Date: 2016-05-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide an amorphous magnesium-aluminum-based composite hydrogen storage material, which solves the problem that the hydrogen desorption temperature of magnesium-based hydrogen storage materials is too high, and can maintain better kinetic properties of the system at a lower operating temperature

Method used

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  • Amorphous magnesium-aluminum-base composite hydrogen storage material and preparation method thereof
  • Amorphous magnesium-aluminum-base composite hydrogen storage material and preparation method thereof
  • Amorphous magnesium-aluminum-base composite hydrogen storage material and preparation method thereof

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Embodiment 1

[0030] According to Mg 17 al 12 The composition ratio of the alloy, the raw materials are Mg and Al powders with a particle size of 74-154 μm and a purity of 99%. 17 al 12 Mix the proportions evenly and place them in a double-layer ball mill tank in a ball mill controlled by ice and salt water, and ball mill at 0°C for 50 hours to prepare amorphous Mg 17 al 12 Base powder material. Subsequently, the transition metal hydride of choice was TiH 2 powder, with a purity of 99%, the prepared amorphous Mg 17 al 12 Base powder and accounted for the Mg 17 al 12 The total amount of matrix is ​​10wt.% TiH 2 The powder was mechanically ball milled at room temperature 25°C for 20 hours, the protective atmosphere of the ball mill was argon with a purity of 99.99%, the pressure of the protective atmosphere was 0.2MPa, the ball-to-material ratio during the ball milling process was 40:1, and the ball mill speed was 450rpm, and finally prepared Amorphous a-Mg 17 al 12 +10wt.%TiH 2 ...

Embodiment 2

[0033] According to Mg 17 al 12 The composition ratio of the alloy, the raw materials are Mg and Al powders with a particle size of 74-154 μm and a purity of 99%. 17 al 12 Mix the proportions evenly and place it in a double-layer ball mill tank in a ball mill controlled by ice salt water, and ball mill at -1°C for 50h to prepare amorphous Mg 17 al 12 Base powder material. Subsequently, the transition metal hydride of choice was TiH 2 powder, with a purity of 99%, the prepared amorphous Mg 17 al 12 Base powder and accounted for the Mg 17 al 12 The total amount of matrix is ​​8wt.% TiH 2 The powder was mechanically ball milled at room temperature 25°C for 30 hours, and other preparation processes were the same as in Example 1, and finally amorphous a-Mg was prepared 17 al 12 +8wt.%TiH 2 Magnesium-based composite hydrogen storage materials.

[0034] For the analysis of amorphous a-Mg 17 al 12 with TiH 2 The composite situation of the sample is analyzed by energy s...

Embodiment 3

[0036] According to Mg 17 al 12 The composition ratio of the alloy, the raw materials are Mg and Al powders with a particle size of 74-154 μm and a purity of 99%. 17 al 12 Mix the proportions evenly and put them in a double-layer ball mill tank in a ball mill with ice salt water for temperature control, and ball mill at -5°C for 35 hours to prepare amorphous Mg 17 al 12 Base powder material. Subsequently, the transition metal hydride of choice was TiH 2 powder, with a purity of 99%, the prepared amorphous Mg 17 al 12 Base powder and accounted for the Mg 17 al 12 The total amount of matrix is ​​10wt.% TiH 2 The powder was mechanically ball milled at room temperature 25°C for 2 hours, the protective atmosphere of the ball mill was hydrogen with a purity of 99.99%, the pressure of the protective atmosphere was 2.5MPa, the ball-to-material ratio during the ball milling process was 20:1, and the ball mill speed was 200rpm. Crystalline a-Mg 17 al 12 +10wt.%TiH 2 Magnesi...

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Abstract

The invention discloses an amorphous magnesium-aluminum-base composite hydrogen storage material and a preparation method thereof. The amorphous magnesium-aluminum-base composite hydrogen storage material is prepared from an amorphous Mg17Al12 matrix and a transition metal hydride in a mass ratio of 100:(0.5-10), wherein the transition metal hydride is one or more of TiH2, ZrH2 and ScH2. The preparation method comprises the following steps: a) in an inert atmosphere, uniformly mixing raw materials Mg powder and Al powder according to the proportioning of the Mg17Al12, and preparing amorphous Mg17Al12 matrix powder by low-temperature ball milling; and b) carrying out mechanical ball milling on the prepared amorphous Mg17Al12 matrix powder and transition metal hydride powder under the protection of the inert gas to obtain the amorphous magnesium-aluminum-base composite hydrogen storage material. The composite hydrogen storage material has excellent medium / low-temperature hydrogen absorption / desorption properties.

Description

technical field [0001] The invention relates to the field of lightweight hydrogen storage materials, in particular to an amorphous magnesium-aluminum matrix composite hydrogen storage material and a preparation method thereof. Background technique [0002] Hydrogen is a clean and efficient energy carrier. Its combustion products are non-polluting. It has the advantages of good combustion performance, fast ignition, and high calorific value. Its development and utilization can not only solve the energy crisis of fossil energy shortages, but also eliminate fossil fuel combustion. A series of environmental pollution problems such as the greenhouse effect and smog have been caused. The use of metal hydrides to store hydrogen is a safe and very high specific volume hydrogen storage density, which plays an irreplaceable role in the field of secondary energy, especially in fuel cells and nickel-metal hydride battery materials. . Metallic Mg is considered as a promising metal hydr...

Claims

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Application Information

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IPC IPC(8): C01B3/02
CPCC01B3/0031C01B3/0078C01P2002/72C01P2004/03C01P2004/04Y02E60/32
Inventor 肖学章姜夫雷陈立新李露李寿权葛红卫
Owner ZHEJIANG UNIV
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