Nano-porous high-entropy alloy and preparation method thereof

A nanoporous, high-entropy alloy technology, applied in the field of non-precious metal nanoporous high-entropy alloys and its preparation, to achieve the effects of reducing high-precision control, simple preparation methods, and ingenious synthesis ideas

Active Publication Date: 2019-11-22
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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  • Nano-porous high-entropy alloy and preparation method thereof
  • Nano-porous high-entropy alloy and preparation method thereof
  • Nano-porous high-entropy alloy and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0039] reference figure 1 The method for preparing non-precious metal nanoporous high-entropy alloys provided by the present invention is a highly controllable top-down synthesis method that combines precursor alloy design with chemical etching, combining traditional metallurgy, rapid cooling and desorption The alloy mainly includes the following steps:

[0040] Step 1. Preparation of Al-based metal block: select high-purity Al, Ni, Co, Fe and X (X: Mo, Cu, Mn, Cr, V, Zr, Nb) metals as raw materials, and the quality and purity of the five elements are all > 99.9wt.%; Then configure the five metals required according to the target composition, for example: Al 97 Ni 1.5 Co 0.5 Fe 0.5 X 0.5 , Or configure the six metals required 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 in atomic percentage; the mixed metal raw materials are placed in a vacuum melting furnace and fully smelted under the protection of argon (...

Embodiment 1

[0046] figure 2 It is a scanning electron microscope (SEM) image of the nanoporous high-entropy alloy AlNiCoFeMo prepared in Example 1 of the present invention. In the preparation process, 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 the 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 macroporous channel layer with a size range of 200-300nm and a thin solid wall layer. Among them, such as figure 2 As shown, the nanopore channel passes through the entire sample, and some smaller nanopores are distributed on the thin wall.

[0047] image 3 It is a low-power transmission electron microscope (TEM) image of the AlNiCoFeMo nanoporous high-entropy alloy AlNiCoFeMo prepared in this embodiment. It further confirmed the existence of smaller nanopores in the thin wall, the size of which w...

Embodiment 2

[0053] The difference from Example 1 is that the nanoporous high-entropy alloy is a six-element nanoporous high-entropy alloy AlNiCoFeCuMo, and 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 indicated in atomic percentages.

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

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Abstract

The invention relates to the field of high-entropy alloy materials, and provides a non-noble metal nano-porous high-entropy alloy and a preparation method thereof. The element composition of the nano-porous high-entropy alloy is AlNiCoFeX, wherein X is one or more of Mo, Cu, Mn, Cr, V, Zr and Nb; the nano-porous high-entropy alloy is of a layered nano porous structure and is provided with a macro-hole channel layer and a thin-wall layer; the macro-hole channel layer comprises first nano-pores; the thin-wall layer comprises second nano-pores; and the size of the first nano-pores is 20-30 timesthat of the second nano-pores. The preparation method of the non-noble metal nano-porous high-entropy alloy is simple; and the highly-controllable top-to-bottom synthesis method is developed by combining traditional metallurgy, rapid cooling and dealloying, the overall synthesis concept is ingenious, and the requirements for high-precision control over the process and the high technical level of operators are reduced.

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] Oxygen evolution reaction (OER) is a key reaction step involved in the recharging process of metal-oxygen batteries and the energy conversion device for electrochemical decomposition of water. However, slow OER usually requires a high overpotential. In order to accelerate the power of OER and reduce the reaction overpotential, a catalyst with high activity is required. As we all know, noble metal-based oxides such as RuO 2 And IrO 2 , It shows high electrocatalytic activity for OER. However, high material costs and scarcity of natural resources hinder their practical application. High-entropy alloys (HEAs) are a new type of alloy that contains five or more main elements in a solid solution phase that has emerged in recent years. Their high entropy effect, dist...

Claims

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Application Information

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Patent Type & Authority Applications(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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