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High-entropy alloy fiber as well as preparation method and application thereof

A high-entropy alloy and fiber technology, used in non-precious metal oxide coatings, electrode coatings, electrolytic components, etc., can solve the problems of low platinum reserves and high platinum catalyst prices, and achieve uniform performance, good catalytic effect, and good stability. Effect

Active Publication Date: 2021-11-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems of high price of platinum catalyst and low platinum reserves, as well as the problem that the electrochemical catalytic performance and stability need to be improved, and provides high-entropy alloy fiber and its preparation method and application

Method used

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  • High-entropy alloy fiber as well as preparation method and application thereof
  • High-entropy alloy fiber as well as preparation method and application thereof
  • High-entropy alloy fiber as well as preparation method and application thereof

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specific Embodiment approach 1

[0028] Embodiment 1: The preparation method of the high-entropy alloy fiber in this embodiment is realized according to the following steps:

[0029] 1. According to Fe 20 co 20 Ni 20 Mo 20 Al 20 The atomic percent, (after calculation) takes by weighing metal Fe, Co, Ni, Mo and Al, obtains mixed metal raw material;

[0030] 2. Use a high vacuum arc melting furnace to melt mixed metal raw materials into metal button ingots, and then melt and absorb the button ingots into master alloy rods with a diameter of 5-20mm;

[0031] 3. Using melt drawing equipment to draw the master alloy rod to obtain alloy fibers;

[0032] 4. Put the alloy fiber into hydrochloric acid or NaOH solution for free dealloying to obtain the high-entropy alloy fiber.

[0033] The composition of the high-entropy alloy fiber in this embodiment is Fe 20 co 20 Ni 20 Mo 20 Al 20 , with a diameter of about 20-38 μm. First, a rod with a diameter of 10 mm and a length of about 10 cm was obtained by Cu die...

specific Embodiment approach 2

[0034] Embodiment 2: This embodiment differs from Embodiment 1 in that the length of the master alloy rod in step 2 is 6-15 cm.

specific Embodiment approach 3

[0035] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step three, a mechanical pump and a molecular pump are used to evacuate the melt drawing equipment, and the vacuum degree is 10 -5 Pa.

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Abstract

The invention discloses a high-entropy alloy fiber as well as a preparation method and application thereof, relates to an electrochemical catalyst and a preparation method thereof, and aims to solve the problems that an existing platinum catalyst is high in price and low in platinum reserve, and the electrochemical catalysis performance and the stability need to be improved. The preparation method comprises the steps: 1, weighing metal raw materials; 2, smelting the mixed metal raw materials into a metal button ingot by adopting a high-vacuum electric arc smelting furnace, and then melting the button ingot to form a master alloy rod by suction casting; 3, performing drawing treatment on the master alloy rod by adopting melt drawing equipment to obtain alloy fibers; and 4, carrying out free dealloying treatment on the alloy fibers. After the high-entropy alloy fiber is subjected to dealloying treatment, a porous structure is formed on the surface, the overpotential of 230 mV can be achieved on electrochemical oxygen evolution catalysis, the Tafel slope is about 40, a good catalysis effect is achieved, meanwhile, a good electrochemical hydrogen evolution catalysis effect is achieved, and the overpotential of hydrogen evolution catalysis is about 180 mV.

Description

technical field [0001] The invention relates to an electrochemical catalyst and a preparation method thereof. Background technique [0002] At present, the commercial electrochemical catalyst is platinum, which has few reserves and is expensive. At present, there are many attempts at platinum-based catalysts. For example: Stamenkovic et al. found that Pt 3 The electrochemical catalytic performance of Ni single crystal is very excellent. Some studies have also carried out catalytic tests by preparing materials coated with Co on the Pt shell. Stability, manganese oxides, rare earth-rich metal phosphates, and borates were also found to be able to catalyze OER under neutral and acidic conditions. But the prices of these catalysts have not been reduced either. The multi-element reconciliation effect is also called the cocktail effect, that is, the advantages of each element in the high-entropy alloy can be uniformly reflected in the high-entropy alloy, so that the high-entropy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/046C25B11/031C25B1/04C22C30/00C22C1/02C23F1/16C23F1/32
CPCC25B11/046C25B11/031C25B1/04C22C30/00C22C27/04C22C1/02C23F1/16C23F1/32Y02E60/36
Inventor 姜思达崔艺凡李博宁志良孙剑飞
Owner HARBIN INST OF TECH
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