Nanoporous high-entropy alloy and its preparation method

A nanoporous, high-entropy alloy technology, applied in the field of non-precious metal nanoporous high-entropy alloys and its preparation, to achieve the effect of being suitable for large-scale production and promotion, reducing high-precision control, and reducing material cost expenditures

Active Publication Date: 2021-06-01
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the preparation method, nanostructured multicomponent noble metal-free HEAs are still difficult to synthesize by traditional bottom-up methods.

Method used

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  • Nanoporous high-entropy alloy and its preparation method
  • Nanoporous high-entropy alloy and its preparation method
  • Nanoporous high-entropy alloy and its preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0039] refer to figure 1 , the preparation method of non-noble metal nanoporous high-entropy alloy provided by the present invention is a highly controllable top-down synthesis method, which combines precursor alloy design with chemical etching, and combines traditional metallurgy, rapid cooling and desorption alloy, mainly including the following steps:

[0040] Step 1, preparing Al-based metal blocks: select high-purity Al, Ni, Co, Fe and X (X: Mo, Cu, Mn, Cr, V, Zr, Nb) metals as raw materials, and the mass purity of the five elements is uniform >99.9wt.%; then configure the required five metals according to the target composition, for example: Al 97 Ni 1.5 co 0.5 Fe 0.5 x 0.5 , or configure the required six metals according to the target composition, for example: Al 96.5 Ni 1.5 co 0.5 Fe 0.5 Cu 0.5 Mo 0.5 The marked composition is the atomic percentage; the mixed metal raw material is placed in a vacuum melting furnace, fully smelted under the protection of argo...

Embodiment 1

[0046] figure 2 is a scanning electron microscope (SEM) image of the nanoporous high-entropy alloy AlNiCoFeMo prepared in Example 1 of the present invention. During fabrication, after selective etching of Al, the pure Al phase is removed and Al is selectively etched 3 Ni-phase (e.g. Al 3 NiCoFeMo) to form nanoporous structured Al-Ni-Co-Fe-Mo. It can be seen from the figure that dealloyed five-element Al 97 Ni 1.5 co 0.5 Fe 0.5 Mo 0.5 The SEM image of the alloy shows a layer of macroporous channels with a size range of 200–300 nm and a thin solid wall layer. Among them, such as figure 2 As shown, the nanopore channel runs through the whole sample, and some smaller nanopores are distributed on the thin wall.

[0047] image 3 It is a low-magnification transmission electron microscope (TEM) image of the AlNiCoFeMo nanoporous high-entropy alloy AlNiCoFeMo prepared in this example. It further confirms the existence of smaller nanopores in the thin walls, with a size of...

Embodiment 2

[0053] The difference from Example 1 is that the nanoporous high-entropy alloy is a six-element nano-high-entropy alloy AlNiCoFeCuMo, according to the target composition Al 96.5 Ni 1.5 co 0.5 Fe 0.5 Cu 0.5 Mo 0.5 The six metals required for the configuration are listed in atomic percent.

[0054] Figure 9 is a scanning electron microscope (SEM) image of the nanoporous high-entropy alloy AlNiCoFeCuMo prepared in this example. Figure 10 It is a low-magnification transmission electron microscope (TEM) image of the nanoporous high-entropy alloy AlNiCoFeCuMo prepared in this example. Figure 11 It is a high-resolution transmission electron microscope (HRTEM) image of the nanoporous high-entropy alloy AlNiCoFeCuMo prepared in this example. Figure 12 It is a scanning transmission electron microscope-energy dispersive spectrometer (STEM-EDS) map of the AlNiCoFeCuMo nanoporous high-entropy alloy AlNiCoFeCuMo prepared in this example. For the six-component nanoporous high-ent...

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Abstract

The invention relates to the field of high-entropy alloy materials, and provides a non-noble metal nanoporous high-entropy alloy and a preparation method thereof. The elemental composition of the nanoporous high-entropy alloy is AlNiCoFeX, where X is one or more of Mo, Cu, Mn, Cr, V, Zr, and Nb. The nanoporous high-entropy alloy is a layered nanoporous structure with large pores. The channel layer and the thin-walled layer, the macroporous channel layer includes first pores, the thin-walled layer includes second pores, and the size of the first pores is 20-30 times the size of the second pores. The preparation method of the non-noble metal nanoporous high-entropy alloy provided by the present invention is simple, and a highly controllable top-down synthesis method has been developed by combining traditional metallurgy, rapid cooling and dealloying. The overall synthesis idea is ingenious, reducing High-precision control of the process and high-tech requirements for operators.

Description

technical field [0001] The invention relates to the field of high-entropy alloy materials, in particular to a non-noble metal nanoporous high-entropy alloy and a preparation method thereof. Background technique [0002] The oxygen evolution reaction (OER) is a critical reaction step involved in the recharging process of metal-oxygen batteries and energy conversion devices for electrochemical water splitting. However, slow OER usually requires a high overpotential. To accelerate the power of OER and reduce the reaction overpotential, catalysts with high activity are required. It is well known that noble metal-based oxides such as RuO 2 and IrO 2 , showing high electrocatalytic activity for OER. However, high material costs and scarcity of natural resources hinder their practical applications. High-entropy alloys (HEAs) are a new type of alloys that contain five or more main elements in a solid solution phase. Their high entropy effect, distorted lattice effect, and slow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C3/00C22C30/00C23F1/44B22D11/06
CPCB22D11/0611C22C1/08C22C3/005C22C30/00C23F1/44
Inventor 邱华军方刚高姣姣谢国强刘兴军
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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