High specific surface area graphene with well-developed mesopores, and preparation method thereof

A high specific surface, graphene technology, applied in the field of high specific surface graphene and its preparation, can solve the problems of weak reactivity of activator, and achieve the effects of shortening activation time, reducing production cost, and reducing energy consumption

Active Publication Date: 2013-03-27
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of the physical activation method is simple, and there are no problems such as equipment corrosion and environmental pollution. However, the activator selected for physical activation is relatively weak in reactivity, and it is difficult to form a developed pore structure inside the carbonaceous precursor. Carbon materials, the activation time needs to be as long as hundreds of hours

Method used

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  • High specific surface area graphene with well-developed mesopores, and preparation method thereof
  • High specific surface area graphene with well-developed mesopores, and preparation method thereof
  • High specific surface area graphene with well-developed mesopores, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0059] A preparation method of high specific surface graphene with well-developed mesopores, comprising the steps of:

[0060] (1) Take graphite oxide prepared by Hummers method, and obtain graphene oxide powder after microwave exfoliation;

[0061] (2) Weigh 500mg of the graphene oxide powder obtained in step (1) and KOH aqueous solution with a concentration of 45wt% at a ratio of 1:9 by weight, fully mix, stir, and dry;

[0062] (3) Place the mixture of graphene oxide and KOH 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, First raise the temperature to 700°C, keep the temperature constant, then pass in saturated water vapor at a flow rate of 80 sccm, and react at 700°C for 60 minutes;

[0063] (4) After the reaction is completed, the temperature is naturally lowered to room temperature, washed, and dried to obtain a high specific surface gra...

Embodiment 2

[0070] A preparation method of high specific surface graphene with well-developed mesopores, comprising the steps of:

[0071] (1) Take graphite oxide prepared by Hummers method, and obtain graphene oxide powder after microwave exfoliation;

[0072] (2) Weigh 500mg of the graphene oxide powder obtained in step (1);

[0073] (3) Place the graphene oxide 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 100 sccm, and first raise the temperature to 600 ℃, keep the temperature constant, then feed saturated water vapor at a flow rate of 50 sccm, and react at a high temperature of 600 ℃ for 30 minutes;

[0074] (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 well-developed mesopores.

[0075] Performance Testing:

[0076] (1) For the SE...

Embodiment 3

[0081] A preparation method of high specific surface graphene with well-developed mesopores, comprising the steps of:

[0082] (1) Take graphite oxide prepared by Brodie method, and obtain graphene oxide powder after microwave exfoliation;

[0083] (2) Weigh 500mg of the graphene oxide powder obtained in step (1) and KOH aqueous solution with a concentration of 45wt% at a ratio of 1:1 by weight, fully mix, stir, and dry;

[0084] (3) Place the mixture of graphene oxide and KOH obtained in step (2) in a vacuum tube furnace. After removing the air in the furnace, 3 The flow rate per minute is to feed helium gas with a purity of 99.99% into the vacuum tube furnace, first raise the temperature to 500°C, keep the temperature constant, and then increase 3 Inject carbon dioxide gas at a flow rate of / min, then raise the temperature to 1800°C, and react at a high temperature of 1800°C for 30 minutes;

[0085] (4) After the reaction is completed, the temperature is naturally lowered ...

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Abstract

The invention relates to a preparation method of high specific surface area graphene with well-developed mesopores. The method comprises the steps of mixing graphene oxide and an activating agent under a protective atmosphere; passing through an activating gas to active the mixture; and finally obtaining the high specific surface area graphene with the well-developed mesopores through processes of washing, filtering and drying. The activating agent is selected any one from potassium hydroxide, sodium hydroxide, phosphoric acid and zinc chloride or a combination of at least two of the above materials. The method is simple in equipment and low in cost, is safe and reliable, has small pollutions and high production efficiency, and is suitable for large-scale production. The obtained graphene has high specific surface area, and is more suitable for migration of electrolyte ions.

Description

technical field [0001] The present invention relates to a high specific surface graphene with developed mesopores and a preparation method thereof, in particular to a high specific surface graphene with developed mesopores and a preparation method thereof, in particular to a chemical-physical combined activation method The invention discloses a method for preparing graphene materials with developed mesopores and high specific surface area, belonging to the field of preparation and application of graphene materials. 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 st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 李璐瞿研
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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