Fluoride-doped high-capacity Gd-Mg-Ni-based composite hydrogen storage material and preparation method thereof

A hydrogen storage material and high-capacity technology, applied in the field of hydrogen storage materials, can solve the problems of slow kinetics and practical application limitations

Pending Publication Date: 2022-01-04
卜文刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the development of MgH during application 2 The kinetics are relatively slow, while the thermodynamic stability is high, so there is a high standard for the temperature of the working environment, which limits its practical application

Method used

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  • Fluoride-doped high-capacity Gd-Mg-Ni-based composite hydrogen storage material and preparation method thereof
  • Fluoride-doped high-capacity Gd-Mg-Ni-based composite hydrogen storage material and preparation method thereof
  • Fluoride-doped high-capacity Gd-Mg-Ni-based composite hydrogen storage material and preparation method thereof

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Experimental program
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preparation example Construction

[0019] The preparation method of high-capacity hydrogen storage material in the present invention comprises the following steps:

[0020] a. Ingredients: Gd according to the chemical formula x Mg 100-x-y Ni y Carry out the matching ratio, in the formula, 1≤x≤9, 5≤y≤20. Since the metal will be burned during the smelting process, 5wt.% of rare earth elements and 8wt.% of Mg should be added to reduce the amount of burning loss. The metal purity of the raw material is >99.5%.

[0021] b. Preparation of matrix alloy: Place the prepared raw materials evenly in the crucible, then turn on the power, start the vacuum induction melting furnace, and evacuate to 1×10 -2 -5×10 -5 Pa, through 0.01-0.1MPa helium as protective gas. The metal is heated and melted, kept warm for 15 minutes, then poured into a mold, and then slowly cooled with the furnace to obtain an alloy ingot with a diameter of 30mm.

[0022] c. Mechanical ball milling treatment: the alloy ingot obtained by vacuum ind...

Embodiment 1

[0025] Example 1: Gd 5 Mg 85 Ni 10 +2wt.%TiF 3

Embodiment 2

[0026] Example 2: Gd 5 Mg 85 Ni 10 +5wt.%TiF 3

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Abstract

The invention relates to a fluoride-doped high-capacity Gd-Mg-Ni-based composite hydrogen storage material and a preparation method thereof. The fluoride-doped high-capacity Gd-Mg-Ni-based composite hydrogen storage material comprises the following components: GdxMg100-x-yNiy + m wt.% (TiF3, NbF5), x and y are atomic ratios, x is more than or equal to 1 and less than or equal to 9, y is more than or equal to 5 and less than or equal to 20, m is the weight percentage of the TiF3 or the NbF5 in an alloy, and m is more than or equal to 2 and less than or equal to 8. Preferably, x is equal to 5, y is equal to 10, and m is equal to 5, namely Gd5Mg85Ni10 + 5wt.% (TiF3, NbF5). According to the preparation method, the preparation method comprises the following steps that medium-frequency induction heating smelting is adopted under the protection of high-purity helium, liquid alloy is injected into a casting mold, and a cylindrical matrix alloy cast ingot is obtained; and an as-cast alloy is crushed mechanically and sieved with a 200-mesh sieve, sieved alloy powder and a certain amount of catalysts (TiF3 and NbF5) are filled into a stainless steel ball milling tank, vacuumizing is achieved, high-purity argon is filled, and ball milling in a planetary high-energy ball mill is carried out for a certain time to obtain the alloy powder with ultrafine grains (nanoscale). According to the fluoride-doped high-capacity Gd-Mg-Ni-based composite hydrogen storage material and the preparation method thereof, through component design, microstructure regulation and control and addition of a multi-element catalyst, the thermal stability of alloy hydride is reduced, and the hydrogen absorption and desorption thermodynamic and dynamic performance of the alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, in particular doping transition metal fluorides, innovatively introducing rare earth elemental gadolinium, and successfully preparing high-capacity Gd-Mg-Ni-based composite reversible hydrogen storage materials. Background technique [0002] With the sustained and rapid economic development, the population base is also expanding, which has led to severe challenges and tests for the reserves of fossil fuels, leading to increasingly serious pollution of the ecological environment. Based on this situation, it is necessary to develop new types of sustainable clean energy and use advanced technology to manage the environment so as to meet the needs of economic development. For hydrogen energy, it is rich in high chemical energy and has the advantages of being renewable, so it is an ideal energy carrier. It is well known that MgH 2 It has a good application prospect, and the reason...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C32/00C22C1/02C22C1/10B22F9/04
CPCC22C23/06C22C32/0089C22C1/1036B22F9/04B22F2009/043B22F2999/00C22C2202/04C22C1/1047B22F2201/12
Inventor 卜文刚
Owner 卜文刚
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