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Cobalt sulfide/layered double metal hydroxide composite electrocatalyst and preparation method thereof

A layered bimetallic, hydroxide technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. Effect of electrocatalytic ability, increased specific surface area, mild conditions

Inactive Publication Date: 2019-08-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides a new solution to the poor conductivity of layered double metal hydroxides
Currently, no Co 9 S 8 Preparation of @LDH / NF composite electrode material and its application in electrocatalytic water splitting

Method used

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  • Cobalt sulfide/layered double metal hydroxide composite electrocatalyst and preparation method thereof
  • Cobalt sulfide/layered double metal hydroxide composite electrocatalyst and preparation method thereof
  • Cobalt sulfide/layered double metal hydroxide composite electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Co 9 S 8 Preparation of / NF samples:

[0027] Weigh 1mmol of CoCl 2 ·6H 2 0 and 5 mmol of urea in a beaker, add deionized water to it, magnetically stir until completely dissolved, then add the resulting transparent pink solution to a polytetrafluoroethylene reactor, add pretreated foamed nickel to carry out hydrothermal reaction , 100°C, 6h; after naturally cooling to room temperature, the nickel foam was taken out, washed with water and alcohol several times, and dried to obtain Co(CO 3 ) 0.35 Cl 0.20 (OH) 1.10 Precursor samples. Weigh 0.25mmol Na 2 S, add deionized water to it, magnetically stir until completely dissolved, then add the obtained transparent solution into a polytetrafluoroethylene reaction kettle, add precursor samples for hydrothermal reaction, 100°C, 5h; after cooling to room temperature naturally , take out the nickel foam, wash and dry to get Co 9 S 8 / NF samples. Let cool and set aside.

Embodiment 2

[0028] Example 2: Co 9 S 8 Preparation of @LDH / NF-1 sample (potential deposition 50s):

[0029] 0.15M Ni(NO 3 ) 2 ·6H 2 O and 0.15M FeSO 4 ·7H 2 O was placed in a beaker, and deionized water was added thereto, and magnetically stirred until it was completely dissolved to obtain a homogeneous solution A, which was set aside. The electrodeposition process is realized in the three-electrode system, first the Co obtained in Example 1 9 S 8 / NF as the working electrode, platinum wire and silver / silver chloride electrode as the counter electrode and reference electrode, respectively. At room temperature, the potential is -1.2 ~ -0.8V, and the A solution is used as the electrolyte, and the constant potential deposition is performed for 50s. After the deposition was completed, the nickel foam was taken out with tweezers, rinsed with deionized water and absolute ethanol, and dried to obtain Co 9 S 8 @LDH / NF Composite. The material is named Co 9 S 8 @LDH / NF-1.

Embodiment 3

[0030] Example 3: Co 9 S 8 Preparation of @LDH / NF-2 samples (potential deposition 100s):

[0031] 0.15M Ni(NO 3 ) 2 ·6H 2 O and 0.15M FeSO 4 ·7H 2 O was placed in a beaker, and deionized water was added thereto, and magnetically stirred until it was completely dissolved to obtain a homogeneous solution A, which was set aside. The electrodeposition process is realized in the three-electrode system, first the Co obtained in Example 1 9 S 8 / NF as the working electrode, platinum wire and silver / silver chloride electrode as the counter electrode and reference electrode, respectively. Under the condition of room temperature, the potential is -1.2~-0.8V, the A solution is used as the electrolyte, and the constant potential is deposited for 100s. After the deposition was completed, the nickel foam was taken out with tweezers, rinsed with deionized water and absolute ethanol, and dried to obtain Co 9 S 8 @LDH / NF Composite. The material is named Co 9 S 8 @LDH / NF-2.

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Abstract

The invention relates to a cobalt sulfide / layered double metal hydroxide composite electrocatalyst and a preparation method thereof, and belongs to the technical field of electrocatalysts. Co9S8 / NF with a good stability and a good conductivity is used as a precursor, and nanosheets with a high specific surface area and uniform composition are loaded on the surface of the precursor in a compoundingmanner to prepare the cobalt sulfide / nickel-iron layered double metal hydroxide / foamed nickel composite electrocatalyst. The prepared material can be used for electrocatalytic hydrogen evolution andoxygen evolution, has a good electrocatalytic performance, is of great significance to prepare, develop and apply the cobalt sulfide / layered double metal hydroxide composite electrocatalyst, and hasa broad application prospect in fields of electrocatalytic hydrogen evolution and oxygen evolution.

Description

technical field [0001] The invention relates to a cobalt sulfide / layered double metal hydroxide composite electrocatalyst and a preparation method thereof, belonging to the technical field of electrocatalysts. Background technique [0002] In recent years, human development is facing a severe energy crisis and environmental pollution problems. The production of hydrogen and oxygen through electrolysis of water can effectively alleviate the current crisis. Total water splitting is a current research hotspot, including hydrogen evolution reaction and oxygen evolution reaction. However, due to the slow kinetics of the oxygen evolution reaction, the efficiency of electrolysis of water is severely restricted, so finding an efficient electrocatalyst for oxygen evolution becomes the key to improve the efficiency of total water splitting. The most active electrocatalyst for oxygen evolution is IrO 2 and RuO 2 , but due to the scarcity of precious metal material resources and high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B11/03C25B1/04C23C18/12C25D9/04B01J27/049B01J37/10B01J37/34
CPCC25B1/04C23C18/1204C25D9/04B01J27/049B01J37/10B01J37/348C25B11/031C25B11/091B01J35/33Y02E60/36
Inventor 徐艳陈敏姜德立李娣孟素慈夏昌坤
Owner JIANGSU UNIV
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