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Preparation method and application of nickel/iron-nickel hydroxide-nickel sulfide heterojunction oxygen evolution catalytic electrode

A hydroxide and catalytic electrode technology, which is applied in the field of electrochemistry, can solve the problems of powdery catalyst shedding, poor electrode wettability, and increased use costs, and achieve low preparation costs, lower adsorption energy barriers, and low cost. Effect

Pending Publication Date: 2022-04-12
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powdery oxygen evolution catalyst has the following unavoidable disadvantages: (1) The use of the powdery catalyst must add a conductive agent and a binder, which will not only increase the cost of use, but the conductive agent and binder will cause the wettability of the electrode to change. Poor; (2) The powdery oxygen evolution catalyst is difficult to apply to the conditions of industrial-grade high-current electrolysis of water, and the rapid desorption of air bubbles will easily cause the powdery catalyst to fall off

Method used

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  • Preparation method and application of nickel/iron-nickel hydroxide-nickel sulfide heterojunction oxygen evolution catalytic electrode
  • Preparation method and application of nickel/iron-nickel hydroxide-nickel sulfide heterojunction oxygen evolution catalytic electrode
  • Preparation method and application of nickel/iron-nickel hydroxide-nickel sulfide heterojunction oxygen evolution catalytic electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0035] Step 1. Cut the nickel sheet into 10mm*20mm*0.1mm sheet, and ultrasonically clean it in acetone, ethanol, and deionized water for 20 minutes;

[0036] Step 2, put 2g of sulfur on the bottom of the ceramic ark with a lid, put the Ni sheet treated in step 1 on the top of the ceramic ark, put the lid on and put it in the tube furnace, and the tube furnace heats up to 500°C at 2°C / min Keep warm for 1h;

[0037] Step 3, put the sample processed in step 2 into 5mol L -1 It is used as anode in KOH electrolyte, with nickel sheet as cathode, and 300mA cm -2 The current density was anodized for 5 hours. After the treatment, the sample was washed with deionized water and dried to obtain a nickel hydroxide@nickel sulfide heterojunction oxygen evolution catalytic electrode.

[0038] The microscopic appearance of the electrode is as figure 1 As shown, it can be seen that the microscopic morphology of the electrode is a ball-and-stick array. This structure can effectively increase ...

Embodiment example 2

[0040] Step 1: Cut foamed nickel (nickel-iron molar ratio is 5:5) iron into 10mm*20mm*0.1mm sheet, and ultrasonically clean them in acetone, ethanol, and deionized water for 30 minutes;

[0041]Step 2, put 2g of sulfur on the bottom of the ceramic ark with a cover, put the foamed ferronickel treated in step 1 on the top of the ceramic ark, put the lid on and put it in the tube furnace, and the tube furnace heats up to 410 °C at 1 °C / min Keep warm for 30 minutes;

[0042] Step 3, put the sample processed in step 2 into 3mol L -1 KOH electrolyte is used as an anode, nickel sheet is used as cathode, and a constant cell voltage of 3V is applied for anodic oxidation treatment for 10 hours. After the treatment, the sample is washed with deionized water and dried to obtain nickel hydroxide@nickel trisulfide heterogeneous Condensation oxygen catalytic electrode. The microscopic appearance of the electrode is as figure 2 As shown, it can be seen that the microscopic morphology of t...

Embodiment example 3

[0044] Step 1: Cut the foamed nickel-iron (nickel-iron molar ratio is 7:3) into 10mm*20mm*0.1mm sheets, and ultrasonically clean them in acetone, ethanol, and deionized water for 30 minutes;

[0045] Step 2, put 2g of sulfur on the bottom of the alumina crucible, place the ferronickel foam treated in step 1 on the top of the alumina crucible, press a piece of alumina on it, and put them together in a resistance furnace. The temperature of the tube furnace is 3°C / raise the temperature to 450°C for 40 minutes;

[0046] Step 3, put the sample processed in step 2 into 1mol L -1 It is used as anode in KOH electrolyte, and nickel sheet is used as cathode, and 500mA cm is applied -2 The current density was anodized for 20 hours. After the treatment, the sample was washed with deionized water and dried to obtain a snail-shaped nickel hydroxide@nickel trisulfide heterojunction oxygen evolution catalytic electrode. The microscopic appearance of the electrode is as image 3 As shown,...

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Abstract

The invention relates to the field of electrochemistry and the technical field of electrocatalysis, in particular to a preparation method and application of a nickel / iron-nickel hydroxide-nickel sulfide heterojunction oxygen evolution catalytic electrode, and the preparation method comprises the following steps: (1) vulcanizing cleaned Ni or Ni-Fe alloy; and (2) immersing the sulfurized product into an electrolyte, carrying out anodic oxidation treatment, and cleaning and drying the treated sample to obtain the nickel / iron nickel hydroxide-nickel sulfide heterojunction oxygen evolution catalytic electrode. The preparation method is simple, the preparation condition requirement is low, the raw material source is rich, the preparation cost is low, the prepared product is environmentally friendly, the prepared material is rich in hydroxide-nickel sulfide heterojunction, the components and morphology can be regulated and controlled through preparation parameters, the prepared electrode has excellent oxygen evolution catalytic activity and stability, and the preparation method is suitable for industrial production. The advantages of electronic structure adjustment and morphology adjustment are fully exerted, and a new thought is provided for design and performance optimization of the electrolytic water oxygen evolution catalyst.

Description

technical field [0001] The invention relates to the field of electrochemistry and the technical field of electrocatalysis, in particular to a preparation method and application of a nickel / iron nickel hydroxide@nickel sulfide heterojunction oxygen evolution catalytic electrode. Background technique [0002] With the increasing consumption of fossil energy and the aggravation of environmental pollution, it is imperative to develop new energy that can replace traditional fossil energy. Among the currently developed new energy sources, sustainable energy sources such as wind energy, water energy, and solar energy have received extensive attention. However, sustainable energy sources such as wind, hydro, solar, etc. need to be stored in some specific form. Hydrogen energy (H 2 ) is considered to be an ideal energy carrier that can be produced in large quantities. Hydrogen production by electrolysis of water has the advantages of simple process and high purity of hydrogen prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B1/04C25B11/031
Inventor 汪的华刘威王帆
Owner WUHAN UNIV
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