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A high-capacity multi-phase hydrogen storage alloy for fuel cells and its preparation method

A hydrogen storage alloy and fuel cell technology, which is applied in the field of hydrogen storage alloy materials, can solve the problems of magnesium-based hydrogen storage materials limitation, slow hydrogen desorption rate, and reduce the thermal stability of alloy hydrides. Hydrogen desorption kinetics performance, improvement of formation ability, effect of improving hydrogen absorption and desorption kinetics performance

Active Publication Date: 2021-09-07
中稀(山东)稀土开发有限公司 +1
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  • Description
  • Claims
  • Application Information

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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 high-capacity multi-phase hydrogen storage alloy for fuel cells and its preparation method
  • A high-capacity multi-phase hydrogen storage alloy for fuel cells and its preparation method
  • A high-capacity multi-phase hydrogen storage alloy for fuel cells and its preparation method

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preparation example Construction

[0019] The preparation method of the high-capacity hydrogen storage alloy for the fuel cell of the present invention comprises the following steps:

[0020] Step 1, ingredients: according to the chemical formula to form Mg 90-x Nd x Ni 5 Zn 5 Carry out batching, wherein, the magnesium in the described chemical formula composition increases the burning loss of 5%~10% proportion when proportioning, and the purity of raw material ≥ 99.5%;

[0021] Step 2, 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. Melting by induction heating, vacuuming to 1×10 -2 ~5×10 -5 Pa, and then filled with helium with a pressure of 0.01~0.1 MPa as a protective gas; the melting temperature is 1500 °C, just to ensure that the metal raw materials are completely melted. The melted alloy is directly poured into the copper casting mold, cooled to roo...

Embodiment 1

[0025] Example 1: Mg 85 Nd 5 Ni 5 Zn 5 (ball milling 5 h)

Embodiment 2

[0026] Example 2: Mg 89 Nd 1 Ni 5 Zn 5 + 4 wt.% NbF 5 (ball milling 8 h)

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Abstract

The invention discloses a high-capacity multi-phase hydrogen storage alloy for fuel cells and a preparation method thereof, which contains element zinc and transition metal nickel, and its chemical formula is: Mg 90‑x Nd x Ni 5 Zn 5 + y wt.%(NbF 5 ), where x is the atomic ratio, x =0~10, y is the mass ratio, y =0~8; Among them, the additive NbF5 accounts for Mg by mass percentage 90‑x Nd x Ni 5 Zn 5 The proportion of the alloy is y wt.%; the hydrogen storage alloy is a multi-phase structure, and has a nanocrystalline-amorphous structure; alloy powder with ultrafine grains (nanoscale) can be obtained, which improves the nanocrystalline and The ability to form amorphous can improve and improve the kinetic performance of hydrogen absorption and desorption of magnesium-based materials, and reduce the thermal stability of magnesium-based hydrides, effectively improving the hydrogen storage performance of magnesium-based hydrogen storage materials.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage alloy materials, in particular to a high-capacity multiphase hydrogen storage alloy for fuel cells and a preparation method thereof. Background technique [0002] With the rapid development and progress of society and the sharp increase in energy demand year by year, the limited fossil energy will soon be unable to meet the growing development needs of human beings. At the same time, the burning of fossil energy will lead to the emission of a large amount of greenhouse gases, causing serious environmental problems such as "global warming". [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, it does not pollute the environment, and it can be applied to fuel cells. In the process of using hydrogen energy, the storage and transportation of hydroge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C23/04C22C1/02B22F1/00B22F9/04
CPCB22F1/0003B22F9/04B22F2009/043C22C1/02C22C23/04C22C23/06C22C2202/04
Inventor 高金良李军张羊换张薇董睿冯旭东
Owner 中稀(山东)稀土开发有限公司