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High-entropy alloy for hydrogen evolution catalysis and preparation method thereof

A high-entropy alloy and hydrogen evolution technology is applied in the field of electrocatalytic hydrogen evolution reaction catalyst preparation to achieve the effects of optimizing hydrogen evolution catalytic performance, efficient hydrogen evolution catalytic performance, and highly disordered atomic arrangement

Active Publication Date: 2021-04-09
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The first object of the present invention: In order to solve the problem of electrolyzing water to produce hydrogen electrode materials and reduce costs, the present invention provides a cheap and efficient hydrogen evolution catalytic high-entropy alloy to replace the existing platinum-group noble metals in the electrode. application

Method used

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  • High-entropy alloy for hydrogen evolution catalysis and preparation method thereof
  • High-entropy alloy for hydrogen evolution catalysis and preparation method thereof
  • High-entropy alloy for hydrogen evolution catalysis and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] This example gives a high-entropy alloy for hydrogen evolution catalysis. The high-entropy alloy is prepared from iron, cobalt, nickel, tungsten, and molybdenum as metal raw materials, and the atomic number of iron, tungsten, and molybdenum in the metal raw materials is The ratio is 1:1:1, and the atomic number ratio of cobalt and nickel is 1:1, wherein the iron atomic number accounts for 9.5% of the total atomic number of the metal raw material, that is, the percentage of each atomic number in the metal raw material in this example is : Iron 9.5%, Cobalt 35.75%, Nickel 35.75%, Tungsten 9.5%, Molybdenum 9.5%.

[0038] In addition, the preparation method of a high-entropy alloy for hydrogen evolution catalysis given in this example includes the following steps:

[0039] S1. Weigh cobalt powder, tungsten powder, iron powder, nickel powder and molybdenum powder according to the preparation ratio of the metal raw materials of the high-entropy alloy (iron 9.5%, cobalt 35.75%...

Embodiment 2

[0046] In order to better reflect the effect of heat treatment temperature on the hydrogen evolution performance of high-entropy alloys, in this example, only the heat treatment process is changed compared with Example 1 while other process parameters are kept constant. The heat treatment process parameters of this example are: the pressureless sintering is to raise the temperature to 750° C. at a heating rate of 20° C. / min, and keep the temperature for 60 minutes.

[0047] At room temperature, Shanghai Chenhua CHI 660E electrochemical workstation was used to perform electrochemical tests on the high-entropy alloy prepared in this example as an electrode (the same test method as in Example 1).

[0048] From the above tests, the electrocatalytic performance of the high-entropy alloy prepared in this example: at a current density of 50mA / cm 2 , the overpotential is 218mV.

Embodiment 3

[0050] In order to better reflect the effect of heat treatment temperature on the hydrogen evolution performance of high-entropy alloys, in this example, only the heat treatment process is changed compared with Example 1 while other process parameters are kept constant. The heat treatment process parameters of this example are as follows: the pressureless sintering is to raise the temperature to 950° C. at a heating rate of 20° C. / min and keep the temperature for 60 minutes.

[0051] At room temperature, Shanghai Chenhua CHI 660E electrochemical workstation was used to perform electrochemical tests on the high-entropy alloy prepared in this example as an electrode (the same test method as in Example 1).

[0052] From the above tests, the electrocatalytic performance of the high-entropy alloy prepared in this example: at a current density of 10mA / cm 2 and 50mA / cm 2 , the overpotentials were 52mV and 74mV, respectively.

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Abstract

The invention provides a high-entropy alloy for hydrogen evolution catalysis and a preparation method thereof. The high-entropy alloy is prepared by taking iron, cobalt, nickel, tungsten and molybdenum as metal raw materials, the atomic number ratio of iron to tungsten to molybdenum in the metal raw materials is 1: 1: 1, the atomic number ratio of cobalt to nickel is 1: 1, and the atomic number of iron accounts for 9.5-12.5% of the total atomic number of the metal raw materials. The preparation method comprises the steps that cobalt powder, tungsten powder, iron powder, nickel powder and molybdenum powder are weighed according to the preparation proportion of the metal raw materials of the high-entropy alloy and are mixed, and mixed powder is obtained; ball milling is performed on the mixed powder; the mixed powder obtained after ball milling is pressed and formed, and a blank is obtained; and the blank is subjected to pressureless sintering, and the high-entropy alloy is obtained. According to the high-entropy alloy provided by the invention, non-noble metal with low price and rich reserves is selected as a raw material, so that the cost is greatly saved. The high-entropy alloy prepared through the method has efficient hydrogen evolution catalytic performance and can replace existing platinum series precious metal to be applied to the aspect of electrodes.

Description

technical field [0001] The invention provides a high-entropy alloy for hydrogen evolution catalysis and a preparation method thereof, and relates to the preparation method of an electrocatalytic hydrogen evolution reaction catalyst and the technical fields of energy storage applications. Background technique [0002] At present, human beings still need a large amount of fossil energy as production power in production and construction activities. The rampant use of fossil fuels has also led to the intensification of the greenhouse effect in recent years. Although fossil fuels are convenient, the pollution to the environment is obvious to all. In addition to releasing carbon dioxide, fossil fuels also release huge amounts of aerosols such as sulfides during combustion. In 1996, according to the second assessment of the United Nations Intergovernmental Panel on Climate Change, it was reported that the greenhouse effect will cause the global average temperature to rise by 1.0°C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/04B22F3/16B22F9/04
CPCC22C30/00C22C1/04B22F3/16B22F9/04B22F2009/043
Inventor 徐轶张长鑫杨洋
Owner SOUTHWEST JIAOTONG UNIV
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