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A kind of nano-CEO2 catalyzed high-capacity re-mg-ni based hydrogen storage alloy and its preparation method

A re-mg-ni, hydrogen storage alloy technology, applied in the field of high-capacity RE-Mg-Ni-based hydrogen storage alloy powder and its preparation, can solve the problems of no reversible hydrogen absorption and desorption, poor hydrogen absorption and desorption kinetics of the alloy, etc.

Inactive Publication Date: 2016-01-20
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, crystalline magnesium-based alloys have almost no reversible ability to absorb and desorb hydrogen at room temperature, and alloys prepared by conventional melting and casting processes have extremely poor hydrogen absorption and desorption kinetics.

Method used

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  • A kind of nano-CEO2 catalyzed high-capacity re-mg-ni based hydrogen storage alloy and its preparation method
  • A kind of nano-CEO2 catalyzed high-capacity re-mg-ni based hydrogen storage alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to chemical formula Nd 0.8 La 0.2 Mg 11 Ni is selected from bulk metal magnesium, metal nickel, rare earth metal neodymium and lanthanum. The purity of these metals is ≥99.8%, and they are weighed according to the chemical dose ratio. Weigh 1230.8g of metallic magnesium, 250.2g of metallic nickel, 516.3g of metallic neodymium, and 124.3g of metallic lanthanum, and place them in a magnesium oxide crucible of an intermediate frequency induction furnace, then cover the furnace lid and vacuum for about 40 minutes to a vacuum of 5×10 -2 Pa or higher, then fill with helium protective gas until the pressure reaches 0.04MPa negative pressure, adjust the power to 5kW, control the temperature at 650℃ to melt the metal magnesium, then adjust the power to 25kW, and control the temperature at 1600℃ to make the metal nickel and neodymium And lanthanum melts. After the metal is melted, keep it under melting conditions for 5 minutes, and finally pour the molten liquid into the...

Embodiment 2

[0022] Alloy composition: Nd 0.8 Ce 0.2 Mg 11 Ni; Weigh 1230.2g of metallic magnesium, 250.0g of metallic nickel, 516.1g of metallic neodymium, and 125.4g of metallic cerium, and prepare alloy powder according to the method of Example 1. The difference is Nano CeO 2 The amount of catalyst added is 6wt%. The structure of alloy powder was tested by XRD, and 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

[0024] Alloy composition: Nd 0.8 Y 0.2 Mg 11 Ni; Weigh 1257.6g of metallic magnesium, 255.6g of metallic nickel, 527.6g of metallic neodymium, and 81.3g of metallic yttrium, and prepare alloy powder according to the method of Example 1. The difference is Nano CeO 2 The amount of catalyst added is 5wt%. The structure of alloy powder was tested by XRD, and 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 relates to a high-capacity RE-Mg-Ni-based hydrogen storage alloy for a fuel cell and a preparation method for the alloy. The alloy contains multiple rare earth elements and a catalyst and comprises Nd[1-x]RExMg11Ni, 50(wt)%Ni and y(wt)%CeO2, wherein RE is at least one of the following rare earth elements: lanthanum, cerium, yttrium, samarium and praseodymium; x is an atomic ratio and is more than 0 and less than 0.5; y is the content of CeO2 in the alloy and is more than 2 and less than 10; preferably, the atomic ratio x is 0.2, and the content y of CeO2 is 5. The preparation method comprises the following steps of performing inductive heating melting under the protection of inert gas, and injecting a molten alloy into a copper casing mold to obtain a cylindrical ingot; placing the ingot in a quartz tube, performing inductive heating for melting the ingot, and continuously spraying the molten ingot from a slit nozzle in the bottom of the quartz tube onto the surface of a water-cooled copper roller which rotates at a certain rate to obtain a quickly-quenched alloy; mixing the crushed alloy powder and nickel powder, performing ball milling for a specified time, adding a trace of CeO2 catalyst, and continuing ball milling to obtain alloy powder with a nanocrystalline-amorphous structure. By component design and structure regulation, the thermostability of alloy hydride is reduced, and the hydrogen absorption and desorption capacity and dynamics performance of the alloy are improved.

Description

Technical field [0001] The invention belongs to the technical field of hydrogen storage alloy materials, and particularly provides a nano-CeO 2 High-capacity RE-Mg-Ni-based hydrogen storage alloy powder for catalytic fuel cell and its preparation technology. Background technique [0002] Magnesium-based alloys are recognized as the most potential hydrogen storage materials due to their high hydrogen storage density and extremely rich resources. Where REMg 12 The hydrogen storage capacity is about 6wt%. In terms of its hydrogen storage capacity, it fully meets the fuel cell's capacity requirements. However, crystalline magnesium-based alloys have almost no ability to reversibly absorb and release hydrogen at room temperature, and alloys prepared by conventional melting and casting processes have extremely poor hydrogen absorption and release kinetics. Studies have shown that element substitution and the addition of an appropriate amount of catalyst can significantly reduce the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88B22F1/00B22F9/04B22D11/06
CPCB22F1/0007B22F9/04C22C45/04H01M4/9041Y02E60/50
Inventor 张胤张羊换李霞侯忠辉胡锋张国芳
Owner INNER MONGOLIA UNIV OF SCI & TECH