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Two-dimensional Co/Co9S8-coated NC nanosheet composite material as well as preparation method and application thereof

A technology of composite materials and nanosheets, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low catalyst reserves, high price, and difficulty in simultaneously having both ORR and OER functions, etc. Achieve high catalytic activity, effect on catalytic sites, good oxygen reduction/oxygen evolution performance

Pending Publication Date: 2022-04-15
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalysts currently used are mainly noble metal-based catalysts (Pt-based, Ir-based, etc.), which have low reserves and are expensive, and it is difficult to have the dual functions of ORR and OER at the same time. Bifunctional catalysts are one of the important problems to be solved in the technical field of zinc-air battery catalyst synthesis

Method used

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  • Two-dimensional Co/Co9S8-coated NC nanosheet composite material as well as preparation method and application thereof
  • Two-dimensional Co/Co9S8-coated NC nanosheet composite material as well as preparation method and application thereof
  • Two-dimensional Co/Co9S8-coated NC nanosheet composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Two-dimensional Co / Co 9 S 8 The preparation of @NC nanosheet composite material specifically includes the following steps:

[0028] (1) At room temperature, dissolve cobalt nitrate and 2-methylimidazole in 20 mL of water respectively, and after ultrasonication for 30 minutes, the dissolution is complete, and the two solutions are mixed to obtain mixed solution A; in mixed solution A, the concentration of cobalt nitrate is 0.05 mol / L, the concentration of 2-methylimidazole is 0.4mol / L;

[0029] (2) Stir the mixed solution A at room temperature for 3 hours until it is completely dissolved, and dry it by centrifugation to obtain a two-dimensional leaf-shaped imidazolate skeleton;

[0030](3) At room temperature, dissolve 120mg of the two-dimensional leaf-like imidazolate skeleton in 20mL of ethanol, and dissolve 30mg of dithioacetamide in 10mg of ethanol. After ultrasonication for 30 minutes, mix the two, stir them evenly for 1 hour, and centrifuge with ethanol. Wash 3...

Embodiment 2

[0038] Two-dimensional Co / Co 9 S 8 The preparation of @NC nanosheet composite material specifically includes the following steps:

[0039] (1) At room temperature, dissolve cobalt chloride and 2-methylimidazole in 20 mL of water respectively, and after ultrasonication for 30 minutes, the dissolution is complete, and the two solutions are mixed to obtain mixed solution A; in mixed solution A, the concentration of cobalt nitrate is 0.05 mol / L, the concentration of 2-methylimidazole is 0.25mol / L;

[0040] (2) Stir the mixed solution A at room temperature for 3 hours until it is completely dissolved, and dry it by centrifugation to obtain a two-dimensional leaf-shaped imidazolate skeleton;

[0041] (3) At room temperature, dissolve 120mg of the two-dimensional leaf-like imidazolate skeleton in 20mL of ethanol, and dissolve 30mg of dithioacetamide in 10mg of ethanol. After ultrasonication for 30 minutes, mix the two, stir them evenly for 1 hour, and centrifuge with ethanol. Wash...

Embodiment 3

[0045] Two-dimensional Co / Co 9 S 8 The preparation of @NC nanosheet composite material specifically includes the following steps:

[0046] (1) At room temperature, dissolve cobalt nitrate and 2-methylimidazole in 20 mL of water respectively, and after ultrasonication for 30 minutes, the dissolution is complete, and the two solutions are mixed to obtain mixed solution A; in mixed solution A, the concentration of cobalt nitrate is 0.05 mol / L, the concentration of 2-methylimidazole is 0.5mol / L;

[0047] (2) Stir the mixed solution A at room temperature for 3 hours until it is completely dissolved, and dry it by centrifugation to obtain a two-dimensional leaf-shaped imidazolate skeleton;

[0048] (3) At room temperature, dissolve 120mg of the two-dimensional leaf-like imidazolate skeleton in 20mL of ethanol, and dissolve 30mg of dithioacetamide in 10mg of ethanol. After ultrasonication for 30 minutes, mix the two, stir them evenly for 1 hour, and centrifuge with ethanol. Wash ...

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Abstract

The invention discloses a two-dimensional Co / Co9S8 (at) NC nanosheet composite material and a preparation method and application thereof.The preparation method comprises the steps that a cobalt precursor and 2-methylimidazole are subjected to simple self-assembly to synthesize a two-dimensional leaf-shaped imidazate framework, then the two-dimensional leaf-shaped imidazate framework and an S and N-containing chelating agent are coordinated to form a precursor of an N and S doped core-shell structure, and the two-dimensional Co / Co9S8 (at) NC nanosheet composite material is obtained. And calcining to finally obtain the product. The active sites of the composite material are increased by means of the doping effect and the synergistic effect of the nitrogen element and the sulfur element, the composite material shows excellent performance in the aspects of specific capacity, maximum power density and current stability when being applied to the cathode of the zinc-air battery, and meanwhile, the composite material is low in cost price, simple in preparation method process and suitable for industrial production. The method is suitable for large-scale production and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of battery electrode nanomaterials, in particular to a two-dimensional Co / Co 9 S 8 @NC nanosheet composites and their preparation methods and applications. Background technique [0002] Energy is the cornerstone of the development of human society. With the improvement of industrialization, human demand for energy continues to increase. People urgently need green, non-polluting renewable energy to replace traditional fossil fuels, which is also one of the important strategies for sustainable development of various countries today. However, new energy sources represented by solar energy, wind energy, and tidal energy are unstable in time, discontinuous in space, have randomness and volatility, and cannot meet the requirements of power smoothing. Therefore, clean and efficient energy storage and conversion devices have become the core of new energy development. Energy shortage and environmental pollution m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M12/06B82Y30/00B82Y40/00
Inventor 卞婷于涛黄龙左林致程龙严世坦
Owner JIANGSU UNIV OF SCI & TECH
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