a ni 3 the s 2 @ni-fe LDH oxygen evolution electrocatalytic electrode and its preparation method and application

An electrocatalysis and electrode technology, which is applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problems of low binding force between nickel-based catalysts and substrates, unfavorable exposure of catalytic active sites, and influence on the efficiency of electrolysis of water, etc., to avoid catalysis Effects of decreased activity, good binding force and conductivity, excellent electrochemical stability and mechanical stability

Active Publication Date: 2019-10-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have achieved certain results, but the nickel-based catalysts prepared by most methods have low binding force to the substrate, and are easy to fall off from the substrate during the long-term oxygen evolution reaction, which affects the efficiency of electrolyzed water; The Ni‐Fe LDH is easy to agglomerate during the synthesis process, which is not conducive to exposing more catalytic active sites

Method used

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  • a ni <sub>3</sub> the s <sub>2</sub> @ni-fe LDH oxygen evolution electrocatalytic electrode and its preparation method and application
  • a ni <sub>3</sub> the s <sub>2</sub> @ni-fe LDH oxygen evolution electrocatalytic electrode and its preparation method and application
  • a ni <sub>3</sub> the s <sub>2</sub> @ni-fe LDH oxygen evolution electrocatalytic electrode and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Pretreatment of the substrate: Cut the pure nickel sheet into a rectangle of 3.5cm·0.5cm, 1cm of the upper half as the clamping part, and 2.5cm of the lower half as the actual use part, immersed in the electrolyte for anodic oxidation deal with. Put the trimmed substrate into acetone for 20 minutes of ultrasonic vibration, then put it into absolute ethanol for 20 minutes of ultrasonic vibration, and then clean it with deionized water.

[0049] (2) Anodization of the substrate: an anodizing electrolyte is prepared with deionized water as a solvent, and the electrolyte composition is 1wt% ammonium fluoride, 80wt% phosphoric acid, and the rest is deionized water. The actual use part of the pretreated substrate in step (1) is immersed in the electrolyte, and the clamping part is connected to the anode electrode. The anodic oxidation device was SP‐150 electrochemical workstation, using a three-electrode system, the substrate was used as the working electrode, the platin...

Embodiment 2

[0098] (1) The pretreatment of the substrate is the same as step (1) in Example 1.

[0099] (2) The anodic oxidation of the substrate is the same as step (2) in Example 1, except that the electrolyte composition is 2wt% ammonium fluoride, 85wt% phosphoric acid, and the rest is deionized water.

[0100] (3) After the anodization is completed, the sample is removed, rinsed with deionized water and dried.

[0101] (4) The anodic oxidation sample is sulfided hydrothermally, and the hydrothermal solution is sulfided with deionized water. The solution components are 0.02mol / L sodium sulfide, 0.1mol / L ammonium fluoride, 5mol / L ethanol, and the rest are deionized Water, add the sample and the prepared solution into the hydrothermal reactor, the volume of the hydrothermal reactor is 25mL, add 10mL of the solution, and the volume ratio is 40%.

[0102] (5) The hydrothermal reactor is sealed and placed in a box-type resistance furnace for heating. The hydrothermal temperature is 140°C, ...

Embodiment 3

[0107] (1) The pretreatment of the substrate is the same as step (1) in Example 1.

[0108] (2) Anodization of the substrate: an anodizing electrolyte was prepared with deionized water as a solvent. The electrolyte composition was 0.5wt% ammonium fluoride, 75wt% phosphoric acid, and the rest was deionized water. The actual use part of the pretreated substrate in step (1) is immersed in the electrolyte, and the clamping part is connected to the anode electrode. The anodic oxidation device was SP‐150 electrochemical workstation, using a three-electrode system, the substrate was used as the working electrode, the platinum electrode was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode. The voltage was increased from the open circuit potential to 5V at a rate of 10mV / s, and the voltage was maintained at 5V for 5 minutes, and the electrolyte temperature was 25°C.

[0109] (3) After the anodization is completed, the sample is remov...

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Abstract

The invention discloses a Ni3S2@Ni-Fe LDH oxygen evolution electro-catalysis electrode as well as a preparation method and an application thereof, and belongs to the field of oxygen evolution catalysis of water electrolysis. The preparation method comprises the following steps of carrying out pretreatment for a nickel matrix, and preparing a nickel-matrix anodic oxide film layer grown in situ through anodic oxidation for the nickel matrix; taking the nickel-matrix anodic oxide film layer as a precursor, and obtaining a Ni3S2 film layer with a nanorod-shaped structure through a sulfuration hydrothermal reaction; and carrying out a ferrum-doping hydrothermal reaction on the film layer subjected to the sulfuration treatment to obtain the Ni3S2@Ni-Fe LDH oxygen evolution electro-catalysis electrode. The method disclosed by the invention is novel, convenient to operate, low in cost, and suitable for industrial production; and the prepared Ni3S2@Ni-Fe LDH electrode material is used for an oxygen evolution reaction of water electrolysis, high in catalytic activity and stability, and capable of being used for industrialized water electrolysis production.

Description

technical field [0001] The invention relates to the fields of electrocatalysis and electrolysis of water, in particular to a Ni 3 S 2 @Ni-Fe LDH oxygen evolution electrocatalytic electrode and its preparation method and application. Background technique [0002] Due to the depletion of fossil fuels and the problem of environmental pollution, it is necessary to develop new energy sources to replace traditional fossil fuels. At present, the widely studied new energy sources include solar energy, wind energy, nuclear energy, and hydrogen energy. Among them, solar energy and wind energy are greatly affected by the weather, and their sources are unstable. Nuclear energy has hidden dangers caused by leakage. Hydrogen energy is convenient to use, completely non-polluting to the environment, has high energy density and high utilization efficiency, and has become a research hotspot in the field of new energy. [0003] Among the current hydrogen production technologies, electrolysi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/06C25D11/26C23C18/12
CPCC23C18/1204C25B1/04C25D11/26C25B11/091Y02E60/36
Inventor 张果戈袁俊逸徐小兵李文芳
Owner SOUTH CHINA UNIV OF TECH
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