CoS2/CoS2-NC catalytic electrode material with three-dimensional core-shell structure as well as preparation method and application of catalytic electrode material

A core-shell structure, catalytic electrode technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve problems such as limited activity, achieve abundant production raw materials, accelerate the rate of electron transfer, and produce low-cost Effect

Inactive Publication Date: 2019-06-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the electrocatalytic activity of the electrocatalytic material obtained by the above preparation method is better than that of the widely used commercial Ir/C electrocataly

Method used

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  • CoS2/CoS2-NC catalytic electrode material with three-dimensional core-shell structure as well as preparation method and application of catalytic electrode material
  • CoS2/CoS2-NC catalytic electrode material with three-dimensional core-shell structure as well as preparation method and application of catalytic electrode material
  • CoS2/CoS2-NC catalytic electrode material with three-dimensional core-shell structure as well as preparation method and application of catalytic electrode material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1

[0037] (1) Preparation of three-dimensional graphene electrode (EG):

[0038] (1-1) Cut the graphite sheet into 2×3cm 2 size, use a mixed solution of ultrapure water and ethanol to wash in an ultrasonic cleaning apparatus for about 1 hour, and dry in an oven at 80 °C;

[0039] (1-2) The graphite sheet treated in step (1) was placed in 0.05M (NH) as an anode 4 ) 2 SO 4 In the solution, the counter electrode is a platinum electrode;

[0040] (1-3) Under the voltage of 10V, electrochemical stripping is performed for about 2min;

[0041] (1-4) Remove the graphite sheet, wash it with deionized water, and dry it in an oven to obtain an EG substrate.

[0042] (2) Electrochemical deposition of Co(OH) 2 :

[0043] (2-1) Using a three-electrode system, the working electrode is EG, and the counter electrode is 2×2cm 2 The platinum electrode, the reference electrode is Ag / AgCl electrode in saturated KCl solution, and the electrolyte is 0.05M Co(NO 3 ) 2 elect...

Example Embodiment

[0060] Example 2

[0061] (1) Preparation of three-dimensional graphene electrode (EG):

[0062] (1-1) Cut the graphite sheet into 3×3cm 2 size, use a mixed solution of ultrapure water and ethanol to wash in an ultrasonic cleaning apparatus for about 1 hour, and dry in an oven at 80 °C;

[0063] (1-2) The graphite sheet treated in step (1) was placed in 0.05M (NH) as an anode 4 ) 2 SO 4 In the solution, the counter electrode is a platinum electrode;

[0064] (1-3) Under the voltage of 10V, the electrochemical stripping is performed for about 3 minutes;

[0065] (1-4) Remove the graphite sheet, wash it with deionized water, and dry it in an oven to obtain an EG substrate.

[0066] (2) Electrochemical deposition of Co(OH) 2 :

[0067] (2-1) Using a three-electrode system, the working electrode is EG, and the counter electrode is 2×2cm 2 The platinum electrode, the reference electrode is Ag / AgCl electrode in saturated KCl solution, and the electrolyte is 0.05M Co(NO 3 )...

Example Embodiment

[0081] Example 3

[0082] (1) Preparation of three-dimensional graphene electrode (EG):

[0083] (1-1) Cut the graphite sheet into 3×3cm 2 size, use a mixed solution of ultrapure water and ethanol to wash in an ultrasonic cleaning apparatus for about 1 hour, and dry in an oven at 80 °C;

[0084] (1-2) The graphite sheet treated in step (1) was placed in 0.05M (NH) as an anode 4 ) 2 SO 4 In the solution, the counter electrode is a platinum electrode;

[0085] (1-3) Under the voltage of 10V, electrochemical stripping is performed for about 2min;

[0086] (1-4) Remove the graphite sheet, wash it with deionized water, and dry it in an oven to obtain an EG substrate.

[0087] (2) Electrochemical deposition of Co(OH) 2 :

[0088] (2-1) Using a three-electrode system, the working electrode is EG, and the counter electrode is 2×2cm 2 The platinum electrode, the reference electrode is Ag / AgCl electrode in saturated KCl solution, and the electrolyte is 0.05M Co(NO 3 ) 2 elect...

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Abstract

The invention discloses a CoS2/CoS2-NC catalytic electrode material with a three-dimensional core-shell structure and a preparation method of the catalytic electrode material. The preparation method comprises the following steps: 1) depositing a Co(OH)2 nanosheet on the surface of a three-dimensional graphene electrode to obtain a Co(OH)2 carbon-based material; 2) performing a reaction on the Co(OH)2 carbon-based material obtained in step (1) and 2-methyl imidazole to obtain a Co(OH)2/ZIF-67 composite; 3) mixing the composite in the step (2) with sulfur powder for vulcanization reaction to obtain the CoS2/CoS2-NC catalytic electrode material with the three-dimensional core-shell structure. The obtained CoS2/CoS2-NC catalytic electrode material with the three-dimensional core-shell structure shows extremely high OER catalytic activity and excellent stability when applied as an anode to water electrocatalysis in an alkaline electrolyte, and has the potential of industrial large-scale preparation of oxygen by electrocatalytic water decomposition.

Description

technical field [0001] The invention relates to the technical fields of nanomaterial technology and electrochemical energy conversion, in particular to a three-dimensional core-shell structure CoS 2 / CoS 2 -Preparation method of NC catalytic electrode material and its application in electrocatalytic water splitting of oxygen. Background technique [0002] Hydrogen production by electrocatalytic water splitting technology is one of the important means to solve the problems of environmental pollution and energy crisis. At present, the global hydrogen energy mainly comes from thermal cracking of petroleum. This process consumes severe energy and causes serious pollution. Compared with this, the electrolysis of water for hydrogen production has the characteristics of cleanliness, environmental protection and high utilization rate, but the overpotential of water cracking anode is relatively high. severely restricted its development. [0003] In terms of kinetics, the anodic el...

Claims

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Application Information

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IPC IPC(8): C25B11/06B01J27/24C25B1/04
CPCY02E60/36
Inventor 侯阳曹骏辉杨彬雷乐成
Owner ZHEJIANG UNIV
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