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High-capacity RE-Mg-Ni-Co based hydrogen storage alloy and preparation method thereof

A re-mg-ni-co, hydrogen storage alloy technology, applied in the field of high-capacity RE-Mg-Ni-Co-based hydrogen storage alloys and their preparation, can solve the problems of reducing alloy hydrides, no reversible hydrogen absorption and desorption, etc. , achieve high hydrogen absorption and desorption capacity, and improve the kinetic performance of hydrogen absorption and desorption

Inactive Publication Date: 2014-04-02
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional process to prepare polycrystalline CeMg 12 Type alloys have almost no reversible ability to absorb and desorb hydrogen at room temperature. 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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  • High-capacity RE-Mg-Ni-Co based hydrogen storage alloy and preparation method thereof
  • High-capacity RE-Mg-Ni-Co based hydrogen storage alloy and preparation method thereof
  • High-capacity RE-Mg-Ni-Co based hydrogen storage alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] According to the chemical formula Ce 0.6 La 0.4 Mg 11 Ni is selected from bulk metal magnesium, metal nickel, rare earth metal cerium and lanthanum. These metals have a purity of ≥99.8% and are weighed according to chemical dosage ratios. The crucible capacity of the melting furnace is about 2 kg, and the ingredients are calculated as 2 kg per furnace. Weigh 1240.0g of metal magnesium, 252.0g of metal nickel, 379.3g of metal cerium, and 250.5g of metal lanthanum, put them in the magnesium oxide crucible of the intermediate frequency induction furnace, then cover the furnace cover, and vacuumize for about 40 minutes to a vacuum degree of 5×10 -3 Above Pa, then fill helium protective gas until the air pressure reaches 0.04MPa negative pressure, adjust the power to 5kW, control the temperature at about 700°C to melt the metal magnesium, then adjust the power to 25kW, and control the temperature at 1600°C to make metal nickel, Cerium and lanthanum melt. After the metal...

Embodiment 2

[0033] The alloy composition is: Ce 0.6 Y 0.4 Mg 11Ni, weigh 1295.5g of magnesium metal, 363.3g of nickel metal, 396.3g of cerium metal, and 167.5g of yttrium metal, and prepare alloy powder according to the method in Example 1. The difference is that nano-NbF 5 The addition amount of catalyst is 4g (8wt%). The structure of the alloy powder was tested by XRD, the results are shown in figure 1 The gaseous hydrogen absorption and desorption capacity and kinetics of the alloy powder were tested, and the results are shown in Table 1.

Embodiment 3

[0035] The alloy composition is: Ce 0.6 Nd 0.4 Mg 11 Ni, weigh 1234.4g of magnesium metal, 250.9g of nickel metal, 258.9g of neodymium metal, and 377.6g of cerium metal, and prepare alloy powder according to the method in Example 1. The difference is that nano-NbF 5 The addition amount of catalyst is 2g (4wt%). The structure of the alloy powder was tested by XRD, the results are shown in figure 1 The gaseous hydrogen absorption and desorption capacity and kinetics of the alloy powder were tested, and the results are shown in Table 1.

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Abstract

The invention belongs to the field of hydrogen storage material preparation and particularly provides a high-capacity RE-Mg-Ni-Co based hydrogen storage alloy and a preparation technology thereof. The high-capacity RE-Mg-Ni-Co based hydrogen storage alloy has a chemical formula of Ce(1-x)RExMg(12-y)Niy+100(wt)%Co+z(wt)%NbF5, wherein x and y represent the atomic ratio, x is greater than 0 and smaller than 0.5, y is greater than 0.5 and smaller than 3, z represents the percentage content of NbF5 in a Ce(1-x)RExMg(12-y)Niy alloy and is greater than 2 and smaller than 8, RE is one of rare earth elements, namely lanthanum, neodymium, yttrium, praseodymium and gadolinium, and the mass of Co is equal to that of the Ce(1-x)RExMg(12-y)Niy alloy. The hydrogen storage alloy is prepared through the steps of proportioning ingredients according to the chemical formula Ce(1-x)RExMg(12-y)Niy, smelting, quickly quenching so as to obtain a thin alloy strip, crushing, screening, mixing with Co powder according to the mass ratio of 1: 1, carrying out first-time ball milling, and carrying out second-time ball milling in a manner of taking nano-NdF5 as a catalyst, thereby obtaining alloy powder with a nanocrystalline-amorphous structure.

Description

technical field [0001] The invention belongs to the field of hydrogen storage material preparation, and in particular provides a high-capacity RE-Mg-Ni-Co based hydrogen storage alloy and its preparation technology. Background technique [0002] Vehicles driven by fuel cells have attracted great attention at home and abroad. However, their application has been greatly limited due to the low capacity of hydrogen storage materials used as hydrogen fuel carriers. Magnesium-based alloys are recognized as the most potential hydrogen storage materials due to their high hydrogen storage density and extremely rich resources. Especially CeMg 12 The hydrogen storage capacity of the magnesium-based alloy is greater than 6wt%, which fully meets the hydrogen storage capacity requirements of fuel cell vehicles in terms of capacity. However, the traditional process to prepare polycrystalline CeMg 12 Type alloys have almost no reversible ability to absorb and desorb hydrogen at room temp...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C45/00C22C1/02B22D11/06
Inventor 张羊换郭世海张建福林玉芳祁焱赵栋梁
Owner CENT IRON & STEEL RES INST
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