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Graphene with high volumetric specific capacitance and preparation method thereof

A graphene, graphene sheet technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems such as the inability to apply large-capacity supercapacitors and other electrical devices, the small size of graphene, etc., to improve energy density, volume specific capacitance, etc. High, simple process results

Active Publication Date: 2013-08-21
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problem that graphene has a small volume specific capacitance and cannot be applied to electrical devices such as large-capacity supercapacitors, the present invention proposes a graphene with high volume specific capacitance in order to effectively solve this problem

Method used

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  • Graphene with high volumetric specific capacitance and preparation method thereof
  • Graphene with high volumetric specific capacitance and preparation method thereof
  • Graphene with high volumetric specific capacitance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A preparation method for high volume ratio capacitance graphene, comprising the steps of:

[0064] (1) Take graphite oxide prepared by Hummers method, and obtain graphene oxide powder after microwave exfoliation;

[0065] (2) Weigh 3g of graphene oxide powder obtained in step (1), 0.5g of charcoal, 15g of KOH, fully mix, stir and dry;

[0066] (3) Place the mixture obtained in step (2) in a vacuum tube furnace. After removing the air in the furnace, feed argon gas with a purity of 99.99% into the vacuum tube furnace at a flow rate of 100 sccm, and react at 800°C for 1.5 h;

[0067] (4) After the reaction is completed, the temperature is naturally lowered to room temperature, washed, and dried to obtain a high specific surface graphene material with increased volume specific capacitance. figure 1 It is a schematic diagram of the preparation process of high volume ratio capacitance graphene described in embodiment 1;

[0068] The specific surface area of ​​the prepared...

Embodiment 2

[0074] A preparation method for high volume ratio capacitance graphene, comprising the steps of:

[0075] (1) Take graphite oxide prepared by Hummers method, and obtain graphene oxide powder after microwave exfoliation;

[0076] (2) Weigh 3g of graphene oxide powder obtained in step (1), 1g of sawdust, 18g of KOH, fully mix, stir and dry;

[0077] (3) Place the mixture obtained in step (2) in a vacuum tube furnace, and after removing the air in the furnace, feed argon gas with a purity of 99.99% into the vacuum tube furnace at a flow rate of 120 sccm, and react at 900°C for 1 hour ;

[0078] (4) After the reaction is completed, the temperature is naturally lowered to room temperature, washed, and dried to obtain a high specific surface graphene material with increased volume specific capacitance.

[0079] The specific surface area of ​​the prepared graphene material is 1996.9m 2 / g (measurement method is the same as Example 1).

[0080] Performance Testing:

[0081] Test ...

Embodiment 3

[0083] A preparation method for high volume ratio capacitance graphene, comprising the steps of:

[0084] (1) Take graphite oxide prepared by Hummers method, and obtain graphene oxide powder after microwave exfoliation;

[0085] (2) Weigh 3g of graphene oxide powder obtained in step (1), 1g of petroleum coke, 15g of KOH, fully mix, stir and dry;

[0086] (3) Place the mixture obtained in step (2) in a vacuum tube furnace, and after removing the air in the furnace, feed argon gas with a purity of 99.99% into the vacuum tube furnace at a flow rate of 60 sccm, and react at 1200°C for 0.5 h;

[0087] (4) After the reaction is completed, the temperature is naturally lowered to room temperature, washed, and dried to obtain a high specific surface graphene material with increased volume specific capacitance.

[0088] The specific surface area of ​​the prepared graphene material is 2150.2m 2 / g (measurement method is the same as Example 1).

[0089] Performance Testing:

[0090] ...

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Abstract

The invention relates to a type of graphene. Active carbon is doped in the graphene sheet. The invention further discloses a preparation method of the graphene. The preparation method comprises the following steps of: adequately mixing oxidized graphene with an activating agent and a carbon-source substance; activating under the protection of a protective atmosphere; and then cooling, washing and drying to obtain the graphene with a high volumetric specific capacitance. According to the graphene and the preparation method disclosed by the invention, the volumetric specific capacitance of the graphene is increased while the high specific surface area and high mass specific capacitance of graphene material are ensured, thus overcoming the technical problem that the graphene cannot be applied to a super-capacitor as an electrode material due to low volumetric specific capacitance. According to the graphene and the preparation method, massive use for chemical reagents is avoided, and the usage amount of the activating agent is reduced; and the graphene is simple in equipment, low in cost, safe and reliable, less in pollution, high in production efficiency, low in cost, capable of being produced on a large scale, very strong in market competitiveness, and wide in application prospect.

Description

technical field [0001] The present invention relates to a high volume ratio capacitance graphene and its preparation method, in particular to a chemical doping method for preparing graphene with high specific surface area and high volume ratio capacitance and its preparation method, belonging to the preparation and application of graphene materials field. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It is a planar film composed of carbon atoms with sp2 hybrid orbitals in a hexagonal honeycomb lattice. It is only one carbon atom thick. The two-dimensional material has a large specific surface area, excellent electrical and thermal conductivity, and good chemical stability. These good properties make graphene-based materials an ideal energy storage material, including supercapacitor electrode materials, lithium-ion battery electrode materials, hydrogen storage materials, fuel cell materials, etc. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/19
Inventor 李璐
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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