A kind of high-capacity mg-zn-ni ternary hydrogen storage alloy and its preparation method

A mg-zn-ni, hydrogen storage alloy technology, applied in the field of hydrogen storage alloy materials, can solve the problems of magnesium-based hydrogen storage materials limitation, slow hydrogen desorption rate, reducing the thermal stability of alloy hydrides, hydrogen absorption and desorption of alloys, etc. Achieve the effects of improving hydrogen absorption and desorption kinetics, increasing formation capacity, increasing nucleation points and diffusion channels

Active Publication Date: 2020-03-20
CENT IRON & STEEL RES INST
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Problems solved by technology

However, its metal hydride has high thermal stability, which leads to the effective release of hydrogen at a high temperature above 400 °C, and the hydrogen release rate is slow, which greatly limits the practical application of magnesium-based hydrogen storage materials. limit
Therefore, reducing the thermal stability of alloy hydrides and improving the kinetics of hydrogen absorption and desorption of alloys has become a severe challenge for researchers.

Method used

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  • A kind of high-capacity mg-zn-ni ternary hydrogen storage alloy and its preparation method
  • A kind of high-capacity mg-zn-ni ternary hydrogen storage alloy and its preparation method
  • A kind of high-capacity mg-zn-ni ternary hydrogen storage alloy and its preparation method

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preparation example Construction

[0037] The preparation method of the high-capacity Mg-Zn-Ni ternary hydrogen storage alloy for the fuel cell of the present invention comprises the following steps:

[0038] a. Ingredients: Mg according to the chemical formula 85 Zn 5 Ni 10Perform batching, wherein the magnesium in the chemical formula composition increases the burning loss by 5% to 10% during the ratio, and the purity of the raw materials is ≥ 99.5%;

[0039] b. Preparation of as-cast master alloy: put prepared raw materials into a magnesia crucible, add all materials except magnesium into the crucible in no particular order, and finally put magnesium on top. Using conventional heating methods, including arc melting, induction heating melting or other heating methods, vacuumize to 1×10 -2 Pa~5×10 -5 Pa, then fill in an inert protective gas with a pressure of 0.01MPa~0.1MPa, the inert protective gas is high-purity helium; the heating power at the beginning of smelting is adjusted to about 5kW, and the temp...

Embodiment 1

[0044] Example 1: Mg 85 Zn 5 Ni 10 (ball milling 5h)

Embodiment 2

[0045] Example 2: Mg 85 Zn 5 Ni 10 +2wt.% (TiF 3 ) (ball milling 5h)

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Abstract

The invention relates to a high-volume Mg-Zn-Ni ternary hydrogen storage alloy and a preparation method thereof. The hydrogen storage alloy is ultrafine grain powder comprising an Mg85Zn5Ni10 alloy and a catalyst TiF3, wherein the catalyst TiF3 accounts for x% of the Mg85Zn5Ni10 alloy by mass, and x is 0-8. The hydrogen storage alloy has an Mg2Ni phase and an MgZn2 phase, and is further of a nanocrystalline / non-crystalline structure. The Zn and Ni in the alloy can weaken the key energy between Mg and H, and the hydrogen storage performance of a magnesium-based hydrogen storage material is effectively improved. Through component design, control over a microstructure and addition of TiF3, the thermal stability of an alloy hydride is reduced, and the hydrogenation and dehydrogenation thermodynamic and kinetic properties of the alloy are improved. The prepared alloy powder maintains high hydrogen storage volume and fast hydrogenation and dehydrogenation kinetic properties; the dehydrogenation temperature of the hydride is remarkably reduced, and quick reversible hydrogenation and dehydrogenation can be conducted at the temperature of 280 DEG C; and the hydrogenation and dehydrogenation circulation stability is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage alloy materials, in particular to a high-capacity Mg-Zn-Ni ternary hydrogen storage alloy for fuel cells and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the development of society, human beings' demand for energy continues to grow, while traditional fossil fuel resources are not only increasingly depleted and non-renewable, but also cause great pollution and damage to the earth's environment on which we live. Therefore, searching for new renewable green energy is one of the major problems facing all mankind. [0003] Hydrogen is a renewable green energy. Hydrogen is not only rich in resources, but also has high energy density and combustion calorific value, and because its combustion product is water, which does not pollute the environment, it can be applied to fuel cells. The storage and transportation of hydrogen are t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/04C22C23/00
CPCB22F1/0003B22F9/04B22F2009/043C22C23/00C22C2202/04
Inventor 尹奕李波张羊换祁焱郭世海赵栋梁
Owner CENT IRON & STEEL RES INST
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