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Nanometer TiF3 catalyzed high-volume hydrogen-storing alloy and preparation method thereof

A hydrogen storage alloy, high-capacity technology, applied in the field of hydrogen storage alloy materials, can solve the problem of extremely poor hydrogen absorption and desorption kinetics of the alloy

Inactive Publication Date: 2014-03-26
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the crystalline La 2 Mg 17 The alloy has almost no ability to desorb hydrogen at room temperature, and the hydrogen absorption and desorption kinetics of the alloy prepared by the conventional melting and casting process are extremely poor

Method used

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  • Nanometer TiF3 catalyzed high-volume hydrogen-storing alloy and preparation method thereof

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preparation example Construction

[0031] The preparation method of the high-capacity hydrogen storage alloy for the fuel cell of the present invention comprises the following steps:

[0032] 1. According to the chemical formula La 2-x RE x Mg 17-y Ni y Dosing, where 0.2<x≤0.5, 1<y<3; RE is at least one of the rare earth elements neodymium, yttrium, and samarium; wherein, the magnesium and lanthanum in the chemical formula composition and the RE rare earth are in the ratio Increase the burning loss by 5%-15%, and the metal purity of raw materials is ≥99.5%;

[0033] 2. Put the prepared raw materials in the magnesia crucible, except for the magnesium on the top layer of the crucible, other materials are added to the crucible in no particular order. Melting by induction heating, vacuuming to 1×10 -2 ~5×10 -4Pa, and then filled with an inert protective gas of 0.01~0.1 MPa, that is, argon + helium mixed gas, the volume ratio of the mixed gas is about 1:1, or filled with high-purity helium; the melting temper...

Embodiment 1

[0039] Example 1: La 1.6 Nd 0.4 Mg 15 Ni 2 +100(wt)%Co+4(wt)%TiF 3 ;

Embodiment 2

[0040] Example 2: La 1.6 Y 0.4 Mg 15 Ni 2 +100(wt)%Co+6(wt)%TiF 3 ;

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Abstract

The invention discloses nanometer TiF3 catalyzed high-volume hydrogen-storing alloy and a preparation method thereof. The compositions of the alloy are shown as the following: La2-xRExMg17-yNiy+100 wt% Co+z wt% TiF3, wherein 0.2<x<0.5, 1<y<3, 3<z<10, RE is at least one of rare earth elements neodymium, yttrium and samarium. The preparation method comprises: in the protection of inert gas, employing induction heating for melting, injecting fused alloy into a copper mold to obtain cylinder ingots; filling a quartz tube with the ingots, performing induction heating fusion, continuously spraying liquid alloy on the surface of a rotating water-cooling copper roller by a slit nozzle at the bottom of the quartz tube to obtain rapid-quenched alloy; and mixing fragmented alloy powder and cobalt powder, performing ball milling, adding trace TiF3 catalyst and continuing to perform ball milling to obtain the alloy powder. Through composition design and structure adjusting, the thermal stability of alloy hydride is reduced and the hydrogen adsorption / desorption capacity and the dynamic performances of the alloy are improved.

Description

[0001] technical field [0002] The invention belongs to the technical field of hydrogen storage alloy materials, and in particular provides a nano-TiF 3 Catalytic high-capacity RE-Mg-Ni based hydrogen storage alloy powder and its preparation technology. Background technique [0003] Metal hydrides are considered as ideal hydrogen fuel carriers for fuel cells due to their efficient and safe hydrogen storage properties. However, the hydrogen storage capacity of the currently commercialized hydrogen storage materials cannot meet the requirements of fuel cells. [0004] Magnesium-based alloys are recognized as the most potential hydrogen storage materials due to their high hydrogen storage density and extremely rich resources. where La 2 Mg 17 The hydrogen storage capacity of the type alloy is about 6wt%. As far as its hydrogen storage capacity is concerned, it fully meets the capacity requirements of fuel cells. [0005] However, the crystalline La 2 Mg 17 The alloy ha...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C19/07C22C30/00C22C45/00C22C45/04C22C1/04B22D11/06H01M4/38
CPCY02E60/10
Inventor 张胤张羊换李霞侯忠辉胡锋张国芳
Owner INNER MONGOLIA UNIV OF SCI & TECH
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