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Porous high-entropy alloy self-supporting electrode for electrolyzing water and preparation method thereof

A self-supporting electrode, high-entropy alloy technology, applied in the field of electrolysis of water

Active Publication Date: 2021-04-30
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, attempts to use high-entropy alloy bulk materials in the field of electrocatalysis are rarely reported, and a small number of reported ones either use noble metal elements as the main element, or require complex processes to synthesize high-entropy alloy nanoparticles

Method used

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  • Porous high-entropy alloy self-supporting electrode for electrolyzing water and preparation method thereof
  • Porous high-entropy alloy self-supporting electrode for electrolyzing water and preparation method thereof
  • Porous high-entropy alloy self-supporting electrode for electrolyzing water and preparation method thereof

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preparation example Construction

[0031] The invention provides a method for preparing a high-entropy alloy-based electrolytic water catalyst, comprising the following steps:

[0032] 1) Melting and mixing nickel powder, cobalt powder, chromium powder, iron powder, aluminum powder and tungsten powder (the molar ratio of which is 30:30:10:10:18:2), and cooling to form a eutectic structure (FCC phase + B2 phase) high-entropy alloy;

[0033] 2) Use a wire cutting machine to cut an area of ​​1×1cm from a large ingot 2 , a square sheet with a thickness of 400 μm, simply polished by a grinding and polishing machine to remove the surface oxide skin, and the thickness is about 300 μm at this time;

[0034] 3) Take 30mL of 1M HCl solution and pipette it into a 50mL centrifuge tube, put a piece of high-entropy alloy sheet into it, soak for 6, 12, 24, 48, 60, and 72h for dealloying treatment; the mass fraction of HCl solution is Anything below 20% is fine.

[0035] 4) After the hydrochloric acid dealloying treatment i...

Embodiment 1

[0038] Raw material components and dosage are as follows:

[0039] Nickel powder, cobalt powder, chromium powder, iron powder, aluminum powder, tungsten powder (the molar ratio is 30:30:10:10:18:2), hydrochloric acid solution (concentration is 1mol / L), potassium hydroxide solution ( The concentration is 1mol / L).

[0040] The preparation technology of this high-entropy alloy-based catalyst:

[0041] Melt and mix nickel powder, cobalt powder, chromium powder, iron powder, aluminum powder, tungsten powder (the molar ratio is 30:30:10:10:18:2), and form a two-phase eutectic structure (FCC) after cooling. phase + B2 phase) of high-entropy alloys; using a wire cutting machine to cut an area of ​​1 × 1cm from a large ingot 2 , a square sheet with a thickness of 400 μm, and the surface oxide skin was simply polished by a grinding and polishing machine, and the thickness was about 300 μm at this time; take 30mL of 1M HCl corrosion solution and pipette it into a 50mL centrifuge tube, ...

Embodiment 2

[0056] Raw material components and dosage are as follows:

[0057] Nickel powder, cobalt powder, chromium powder, iron powder, aluminum powder, tungsten powder (the molar ratio is 25:20:20:15:15:5), hydrochloric acid solution (concentration is 2mol / L), potassium hydroxide solution ( The concentration is 1mol / L).

[0058] The preparation technology of this high-entropy alloy-based catalyst:

[0059] Melt and mix nickel powder, cobalt powder, chromium powder, iron powder, aluminum powder, tungsten powder (the molar ratio is 25:20:20:15:15:5), and form a two-phase eutectic structure (FCC) after cooling phase + B2 phase) of high-entropy alloys; using a wire cutting machine to cut an area of ​​1 × 1cm from a large ingot 2 , a square sheet with a thickness of 400 μm, and the surface oxide scale was simply polished by a grinding and polishing machine, and the thickness was about 300 μm at this time; take 30mL of 2M HCl corrosion solution and pipette it into a 50mL centrifuge tube, ...

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Abstract

The invention discloses a porous high-entropy alloy self-supporting electrode for electrolyzing water and a preparation method thereof. The preparation method comprises the following steps: smelting, mixing and melting nickel powder, cobalt powder, chromium powder, iron powder, aluminum powder and tungsten powder, and conducting cooling to form a high-entropy alloy with an eutectic structure; cutting the high-entropy alloy into an alloy sheet, and conducting polishing to remove surface oxide skins; then carrying out dealloying treatment; and after dealloying treatment is completed, taking out the alloy sheet and carrying out ultrasonic treatment so as to obtain the self-supporting electrode. The invention provides a simple, efficient and controllable dealloying means for treating the high-entropy alloy sheet to obtain the sheet-shaped high-entropy alloy self-supporting catalytic electrode with a multi-scale pore structure, and the sheet-shaped high-entropy alloy self-supporting catalytic electrode is proved to have excellent electro-catalytic hydrogen evolution / oxygen evolution reaction activity and stability.

Description

technical field [0001] The invention relates to the technical field of electrolyzed water, in particular to a porous high-entropy alloy self-supporting electrode and method for electrolyzed water. Background technique [0002] As an important part of the national economy, the hydrogen energy economy has received increasing attention, and the key to the development of the hydrogen energy economy lies in the preparation of hydrogen. Electrochemical catalytic water splitting for hydrogen production is regarded as a means of hydrogen production with great application potential because of its high cleanliness and strong controllability. Although hydrogen production by electrolysis of water has great application potential, the current production of hydrogen by electrolysis of water only accounts for about 4% of the global production. The conversion efficiency of electrocatalysts is still at a relatively low level, which consumes a lot of electric energy, which increases the cost ...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/031C25B11/046C22C30/00C22C3/00
CPCC25B1/04C25B11/04C22C30/00C22C3/00Y02E60/36
Inventor 韩潇陈乔吴庆峰陈庆玺王志军王锦程张静李俊杰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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