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Difunctional water electrolysis electrode with super wettability and preparation method thereof

A water electrolysis and dual-function technology, applied in the field of nanomaterials, can solve the problems of not realizing the maximum utilization of active sites, hindering the mass transfer of electrolyte, and reducing the activity of hydrogen evolution, so as to overcome the bubble shielding effect, promote rapid diffusion, mechanical high intensity effect

Active Publication Date: 2020-05-15
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In electrolyzed water, if the electrolyte cannot fully wet the electrode surface, the maximum utilization of the active sites cannot be achieved, resulting in poor hydrogen evolution activity
In addition, a large amount of hydrogen and oxygen will be generated on the electrode surface under high current density. If these bubbles cannot diffuse from the electrode surface in time, it will lead to a serious "shielding effect" of the bubbles—impeding the mass transfer of the electrolyte and blocking the active sites. , which eventually reduces the hydrogen evolution activity

Method used

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  • Difunctional water electrolysis electrode with super wettability and preparation method thereof
  • Difunctional water electrolysis electrode with super wettability and preparation method thereof
  • Difunctional water electrolysis electrode with super wettability and preparation method thereof

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Embodiment 1

[0026] S1: Pretreatment of foamed nickel substrate: Cut the foamed nickel material into a sheet with a length of 2 cm and a width of 2 cm, then ultrasonically clean it with acetone and absolute ethanol for 3 minutes, and then put it in a vacuum drying oven at 50 ° C for 24 hours to obtain ; S2: Preparation of precursor solution: Dissolve cobalt acetate tetrahydrate and sodium sulfide nonahydrate in 15mol ultrapure water at a molar ratio of 5mmol:3mmol, and stir for 25min until dissolved to obtain a precursor solution; S3: Hydrothermal reaction: Transfer the precursor solution into a 50mL reaction kettle with a carrier nickel foam, and carry out a hydrothermal reaction at 100°C. After reacting for 8 hours, the product was collected by natural cooling, cleaned with deionized water and absolute ethanol, and removed. Vacuum drying, that is.

Embodiment 2

[0028] S1: Pretreatment of foamed nickel substrate: Cut the foamed nickel material into a sheet with a length of 5 cm and a width of 5 cm, then ultrasonically clean it with acetone and absolute ethanol for 10 minutes, and then put it in a vacuum drying oven at 70 ° C for 15 hours to obtain ; S2: Preparation of precursor solution: Dissolve cobalt acetate tetrahydrate and sodium sulfide nonahydrate in 51.35mol ultrapure water at a molar ratio of 5mmol:5mmol, and stir for 50min until dissolved to obtain a precursor solution; S3: hydrothermal reaction : Transfer the precursor solution into a 50mL reaction kettle with carrier foam nickel, carry out hydrothermal reaction at 200°C, after reacting for 3h, cool and collect the product naturally, wash the product with deionized water and absolute ethanol and remove It is vacuum-dried and obtained.

Embodiment 3

[0030] S1: Pretreatment of foamed nickel substrate: Cut the foamed nickel material into a sheet with a length of 2 cm and a width of 3 cm, then ultrasonically clean it with acetone and absolute ethanol for 5 minutes, and then put it in a vacuum oven at 60°C for 20 hours to get the final product. ; S2: Preparation of precursor solution: Dissolve cobalt acetate tetrahydrate and sodium sulfide nonahydrate in 22mol ultrapure water at a molar ratio of 5mmol: 4mmol, stir magnetically for 30min until dissolved, and obtain a precursor solution; S3: hydrothermal reaction : Transfer the precursor solution into a 50mL reaction kettle with carrier nickel foam, carry out hydrothermal reaction at 150°C, after reacting for 5h, cool and collect the product naturally, wash the product with deionized water and absolute ethanol and remove It is vacuum-dried and obtained.

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Abstract

The invention relates to a bifunctional water electrolysis electrode with super wettability as well as a preparation method and application thereof. The bifunctional water electrolysis electrode withsuper wettability is realized by generating a compact nanosheet array structure through reaction of cobalt acetate tetrahydrate and sodium sulfide nonahydrate on the surface of foamed nickel. The electrode prepared by the method disclosed by the invention has super hydrophilicity and super-hydrophobic property; the water electrolysis reaction on the surface of the electrode continuously occurs; therefore, mass transfer of reactants and rapid diffusion of gas in the catalytic hydrogen evolution process are facilitated, finally, the electrode shows excellent bifunctional water electrolysis performance, the catalytic hydrogen evolution efficiency is remarkably improved, the catalytic cost is reduced, and the electrode has great significance in promoting development of the hydrogen evolution technology and further using clean energy.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a super-wetting dual-function electrolytic water electrode and a preparation method thereof. Background technique [0002] Renewable clean energy has always been a research hotspot in the field of energy utilization and conversion. Hydrogen energy is considered as an ideal green new energy due to its advantages of cleanness, high calorific value, renewable and various forms of utilization. Electrolysis of water is an efficient way to produce hydrogen energy. However, in the electrolysis of water to produce hydrogen, the high anodic and cathodic reaction barriers make it necessary to consume high electric energy to realize the decomposition of water, and the energy conversion efficiency is low. As a catalytic material for electrolysis of hydrogen evolution, noble metals have both good activity and stability. However, due to their high price, the cost of hydrogen production by ...

Claims

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Application Information

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IPC IPC(8): C25B11/03C25B11/06C25B1/04H01M12/06H01M4/90H01M4/88H01G11/86H01G11/30
CPCC25B1/04C25B11/031C25B11/051C25B11/091H01G11/30H01G11/86H01M4/88H01M4/9016H01M12/06Y02E60/36
Inventor 李彩彩姜林伟孙庆丰杨彩霞徐璐璐
Owner ZHEJIANG FORESTRY UNIVERSITY
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