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Three-dimensional graphene and preparation method of graphene composite material

A graphene, three-dimensional technology, applied in the field of graphene, can solve the problems of large electron and ion transmission distance, low electrode volume energy density, unfavorable large rate performance, etc., to achieve high volume density, good mechanical properties, and strong operability Effect

Active Publication Date: 2016-12-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, further studies have shown that the volume density of the graphene foam obtained by the above method is very low due to the excessively large pore size and pore size distribution (100-500 μm), and the volume energy density of the electrode obtained when used for energy storage is extremely low; Moreover, the excessively large pore size makes the transmission distance of electrons and ions too large, which is not conducive to the performance of high-rate performance; in addition, the operability of graphene foam needs to be further enhanced during the application process, and these problems have become important constraints to the development of its application. question

Method used

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preparation example Construction

[0036] The invention provides a method for preparing three-dimensional graphene, comprising the following steps: S1) depositing a metal substrate on the surface of a wire mesh to obtain a wire mesh template; S2) growing graphene on the surface of the wire mesh template by chemical vapor deposition , to obtain a graphene-grown screen template; S3) etching the graphene-grown screen template with an acid solution to obtain three-dimensional graphene.

[0037] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0038] The wire mesh is preferably stainless steel wire mesh, copper wire mesh or nickel wire mesh; but because stainless steel mesh is usually used as a filter mesh, its corrosion resistance and acid and alkali resistance are very strong, which makes it difficult to remove in the etching stage , it is difficult for the copper mesh to achieve a higher mesh number, and the mesh number of the ...

Embodiment 1

[0059] 1.1 First cut a long piece of nickel wire mesh, and fold it into the desired number of layers, for example, the folded size is 5cm (length) × 3cm (width). Then put it in a tablet press and pressurize it at 25MPa to preliminarily press it into a three-dimensional template with a certain chimeric force; then use it as the working electrode, the Ag / AgCl electrode as the reference electrode, and the pure nickel sheet as the counter electrode to form a three-electrode system For the electrochemical deposition of nickel, the electrolyte is 270g / L NiSO 4 ·6H 2 O, 40g / L NiCl 2 ·6H 2 O and 40g / L of H 3 BO 3 mixed solution. The electroplating parameters are: the electroplating voltage is -1V, and the electroplating time is 8000s. After the electroplating, ultrasonic cleaning with 1mol / L hydrochloric acid, deionized water and absolute ethanol obtained a three-dimensional nickel mesh catalytic template with good connectivity, that is, a mesh template.

[0060] 1.2 Put the th...

Embodiment 2

[0069] 2.1 First cut a long piece of nickel wire mesh, and fold it into the required number of layers, for example, the folded size is 5cm (length) × 3cm (width). Then put it in a tablet press and pressurize it at 25MPa to preliminarily press it into a three-dimensional template with a certain chimeric force; then use it as the working electrode, the Ag / AgCl electrode as the reference electrode, and the pure nickel sheet as the counter electrode to form a three-electrode system For the electrochemical deposition of nickel, the electrolyte is 270g / L NiSO 4 ·6H 2 O, 40g / L NiCl 2 ·6H 2 O and 40g / L of H 3 BO 3 mixed solution. The electroplating parameters are: the electroplating voltage is -1V, and the electroplating time is 8000s. After the electroplating, ultrasonic cleaning with 1mol / L hydrochloric acid, deionized water and absolute ethanol obtained a three-dimensional nickel mesh catalytic template with good connectivity, that is, a mesh template.

[0070] 2.2 Put the t...

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Abstract

The invention provides a preparation method of three-dimensional graphene. The method comprises the steps that a metal substrate is deposited on the surface of a metal wire mesh, and a wire mesh template is obtained; 2, graphene grows on the surface of the wire mesh template through chemical vapor deposition, and the wire mesh template on which graphene grows is obtained; 3, the wire mesh template on which graphene grows is etched through an acid solution, and three-dimensional graphene is obtained. Compared with the prior art, the metal wire mesh on which the metal substrate is deposited is used as the template which has the adjustable hole diameter and thickness, accordingly, the obtained three-dimensional graphene is small in hole diameter and uniform in distribution, and has stronger operability and has higher conductivity and heat conductivity, good mechanical performance and several-time higher volume density compared with graphene foam.

Description

technical field [0001] The invention belongs to the technical field of graphene, in particular to a preparation method of three-dimensional graphene and a composite material thereof. Background technique [0002] Graphene is a new type of carbon material composed of closely packed carbon atoms. It is only one atom thick. Its unique two-dimensional honeycomb crystal structure endows it with excellent electrical, optical, thermal and mechanical properties, and is widely used. It is used in many fields such as supercapacitors, lithium-ion batteries, solar cells and environmental protection. However, as a two-dimensional microstructure, graphene has its application limitations. In practical applications, graphene is often assembled into a three-dimensional macroscopic assembly, that is, three-dimensional graphene. Compared with two-dimensional graphene, three-dimensional graphene not only has excellent properties of graphene itself but also has specific structural advantages. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B31/02B82Y40/00B82Y30/00
CPCC01P2002/82C01P2004/03C01P2004/04
Inventor 杨广元汪伟刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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