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A core-shell cos2@ng nanocomposite material and its preparation and application

A nanocomposite material and nanoparticle technology, applied in the field of core-shell CoS2@NG nanocomposite materials and their preparation, can solve the problems of inability to large-scale application, scarcity of precious metals, etc., and achieve good hydrogen evolution electrocatalytic performance, low cost, and improved Effect of hydrogen evolution catalytic activity and stability

Inactive Publication Date: 2019-05-07
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings and deficiencies in the above-mentioned prior art that cannot be applied on a large scale due to the scarcity and cost of precious metals, the primary purpose of the present invention is to provide a high-performance, low-cost, resource-rich and excellent hydrogen evolution electrocatalytic performance core-shell CoS 2 @NG Nanocomposites

Method used

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  • A core-shell cos2@ng nanocomposite material and its preparation and application
  • A core-shell cos2@ng nanocomposite material and its preparation and application
  • A core-shell cos2@ng nanocomposite material and its preparation and application

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Embodiment 1

[0044] This embodiment includes the following steps:

[0045] (1) Graphene oxide was prepared by the modified Hummers method.

[0046] (2) 294.413mg CoCl 2 ·6H 2 O and 310.238 mg Na 2 S 2 o 3 ·5H 2 O was dissolved in a solution of 10 mL deionized water and 30 mL ethanol, and stirred for 3 h to obtain a well-mixed blue solution.

[0047] (3) Add the solution obtained in step 2 into the reaction kettle, and then seal it. A stainless steel autoclave was placed in an electric furnace and heated at 160 °C for 24 h, and then allowed to cool naturally to room temperature. Finally, the black precipitate was collected by centrifugation, washed thoroughly with deionized water and ethanol six times, and dried in a vacuum oven at 60 °C for 12 h.

[0048] (4) CoS obtained in step 3 2 The particles (0.5 g) were dispersed in 30 mL of toluene solution by sonication. After 1h, 0.5mL APS was added to the above solution and stirred for 24h to obtain APS-modified CoS 2 particles. Then...

Embodiment 2

[0052] This embodiment includes the following steps:

[0053] (1) Graphene oxide was prepared by the modified Hummers method.

[0054] (2) 280mg CoCl 2 ·6H 2 O and 290 mg Na 2 S 2 o 3 ·5H 2 O was dissolved in a solution of 20mL deionized water and 40mL ethanol, and stirred for 3h to obtain a uniformly mixed blue solution.

[0055] (3) Add the solution obtained in step 2 into the reaction kettle, and then seal it. A stainless steel autoclave was placed in an electric furnace and heated at 140° C. for 26 h, and then allowed to cool naturally to room temperature. Finally, the black precipitate was collected by centrifugation, washed thoroughly with deionized water and ethanol six times, and dried in a vacuum oven at 60 °C for 12 h.

[0056] (4) CoS obtained in step 3 2 The particles (0.6 g) were dispersed in 50 mL of toluene solution by sonication. After 1h, 0.6mL APS was added to the above solution and stirred for 24h to obtain APS-modified CoS 2 particles. Then, GO ...

Embodiment 3

[0059] This embodiment includes the following steps:

[0060] (1) Graphene oxide was prepared by the modified Hummers method.

[0061] (2) 310mg CoCl 2 ·6H 2 O and 320mg Na 2 S 2 o 3 ·5H 2 O was dissolved in a solution of 30mL deionized water and 50mL ethanol, and stirred for 3h to obtain a uniformly mixed blue solution.

[0062] (3) Add the solution obtained in step 2 into the reaction kettle, and then seal it. A stainless steel autoclave was placed in an electric furnace and heated at 180° C. for 18 h, and then allowed to cool naturally to room temperature. Finally, the black precipitate was collected by centrifugation, washed thoroughly with deionized water and ethanol six times, and dried in a vacuum oven at 60 °C for 12 h.

[0063] (4) CoS obtained in step 3 2 The particles (0.2 g) were dispersed in 40 mL of toluene solution by sonication. After 1h, 0.2mL APS was added to the above solution and stirred for 24h to obtain APS-modified CoS 2 particles. Then, GO (...

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Abstract

The invention belongs to the technical field of electrocatalysis of hydrogen evolution, and discloses a core-shell CoS2@NG nanometer composite material with high performance, low cost, rich resources and excellent electrocatalytic performance of hydrogen evolution, and preparation and application thereof. The preparation method provided by the invention comprises the following steps: subjecting a growth solution of CoS2 to a hydrothermal process so as to obtain core-shell CoS2 nanoparticles; then mixing the core-shell CoS2 nanoparticles with APS in a solvent, and carrying out stirring so as to obtain APS-modified core-shell CoS2 nanoparticles; and placing the APS-modified core-shell CoS2 nanoparticles in a nitrogen doped graphene oxide precursor solution, and carrying out a hydrothermal process so as to obtain the composite material, wherein the precursor solution is composed of the following components: graphene oxide, ammonia water and sodium hydroxide. The composite material provided by the invention has good mechanical flexibility, excellent electrocatalytic performance, electrocatalytic activity of hydrogen evolution and stability, shows low onset potential, low overpotential and high cycling stability, can be applied to the field of electrocatalytic activity of hydrogen evolution, and provides a solution method for the problem of electrocatalysis of hydrogen evolution in the prior art.

Description

technical field [0001] The invention belongs to the technical field of hydrogen evolution electrocatalysis, in particular to a core-shell CoS with high performance, low cost, rich resources and excellent hydrogen evolution catalytic performance 2 @NG nanocomposite materials and their preparation methods and applications. Background technique [0002] As the global energy crisis and environmental pollution become more and more serious, the development of renewable and carbon-free new energy is imminent. Due to its clean, efficient and renewable advantages, hydrogen is considered to be the most ideal energy carrier to replace fossil fuels in the future. Hydrolysis is an important method to produce high-purity hydrogen in large quantities, and hydrogen evolution reaction is a key step in water splitting. The catalyst can minimize the overpotential of the hydrogen evolution reaction and achieve high energy efficiency for water splitting. Although noble metals are the most eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043C25B1/04C25B11/06
CPCB01J27/043B01J35/0033C25B1/04C25B11/04Y02E60/36
Inventor 邱文达黎彧
Owner GUANGDONG IND TECHN COLLEGE
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