Preparation method of porous graphene

A porous graphene, graphene technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of large damage to graphene regularity, low degree of graphene exfoliation, affecting the overall performance of graphene, etc. problems, to achieve the effect of inhibiting the high temperature agglomeration effect, easy to scale production, and low cost

Inactive Publication Date: 2013-12-25
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the technologies involved in these methods do not peel graphene to a high degree, and the improvement of its specific surface area is mainly achieved through the loss of carbon during the activation process, which greatly damages the regularity of graphene and does not fully utilize graphene. Advantages of 2D nanosheet materials, affecting the overall properties of graphene

Method used

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Embodiment 1

[0056] A preparation method of porous graphene, comprising the following steps:

[0057] (1) Add 0.5g of graphite oxide to 125mL of water / ethanol mixed solution with pH=9~10 (the volume ratio of water to ethanol is 2:1), stir magnetically for 72 hours, and then ultrasonically disperse for 40 minutes to form graphene oxide Colloidal dispersion; then add 0.5g salicylic acid, stir for 6 hours, filter to remove excess salicylic acid, and dry to obtain a solid mixture of graphene oxide and salicylic acid;

[0058] (2) In a reducing atmosphere of hydrogen / argon (volume ratio 1:4), place the solid mixture of graphene oxide and salicylic acid obtained in step (1) in a tube furnace for expansion reduction: from room temperature Gradually rise to 500°C, control the heating rate to 5°C / min, and keep warm at 200°C for 15 minutes, and keep warm at 500°C for 1 hour to obtain expanded graphene;

[0059] (3) Immerse the expanded graphene obtained in step (2) in potassium hydroxide solution, ...

Embodiment 2

[0065] A preparation method of porous graphene, comprising the following steps:

[0066] (1) Add 0.1g graphite oxide to 200mL water / ethanol mixed solution with pH=9~10 (the volume ratio of water and ethanol is 2:1), stir magnetically for 48 hours, and disperse ultrasonically for 1 hour to form graphene oxide Colloidal dispersion; then add 0.3g ammonium bicarbonate, stir for 2 hours, filter to remove excess ammonium bicarbonate, and dry to obtain a solid mixture of graphene oxide and ammonium bicarbonate;

[0067] (2) In a reducing atmosphere of hydrogen / argon (volume ratio 1:8), place the solid mixture of graphene oxide and ammonium bicarbonate obtained in step (1) in a tube furnace for expansion reduction: from room temperature Gradually rise to 500°C, control the heating rate to 10°C / min, and keep warm at 200°C for 20 minutes, and keep warm at 500°C for 2 hours to obtain expanded graphene;

[0068] (3) Immerse the expanded graphene obtained in step (2) in potassium hydroxid...

Embodiment 3

[0073] A preparation method of porous graphene, comprising the following steps:

[0074] (1) Add 0.5g of graphite oxide to 100mL of water / ethanol mixed solution with pH=9~10 (volume ratio of water to ethanol is 2:1), stir magnetically for 60 hours, and then ultrasonically disperse for 2 hours to form graphene oxide Colloidal dispersion; then add 0.15g of azodicarbonamide, stir for 12 hours, filter to remove excess azodicarbonamide, and dry to obtain a solid mixture of graphene oxide and azodicarbonamide;

[0075] (2) In a reducing atmosphere of hydrogen / nitrogen (volume ratio 1:1), place the solid mixture of graphene oxide and azodicarbonamide obtained in step (1) in a tube furnace for expansion reduction: from room temperature Gradually rise to 500°C, control the heating rate to 2°C / min, and keep warm at 200°C for 30 minutes, and keep warm at 500°C for 1 hour to obtain expanded graphene;

[0076] (3) Immerse the expanded graphene obtained in step (2) in potassium hydroxide s...

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Abstract

The invention discloses a preparation method of porous graphene. The method comprises the steps of: (1) stripping graphite oxide in a water/ethanol mixed solution with pH of 9-10, adding a chemical foaming agent and mixing them uniformly, carrying out filtering and drying to obtain a solid mixture; (2) placing the mixture in a reducing atmosphere, and performing heating expansion reduction to obtain expanded graphene; (3) blending the expanded graphene with strong base, and conducting high temperature activation; and (4) washing the product with hydrochloric acid and deionized water, and performing drying so as to obtain porous grapheme. The porous graphene prepared by the method involved in the invention has a specific surface area up to 2075m<2>/g, a pore volume up to 1.8cm<3>/g, and an average pore size of 1-7nm. As a supercapacitor electrode material, the specific capacitance can reach 155F/g under a current density of 1Ag<-1>. As a porous graphene electrode, the specific capacitance can reach 84.4% along with the increase of current density from 0.2Ag<-1> to 20Ag<-1>. The porous graphene has high specific capacitance and cycle stability. The preparation method disclosed in the invention has the advantages of simple process, low cost, and easy scale production.

Description

technical field [0001] The invention relates to the technical field of graphene materials, in particular to a method for preparing volume-expanded and surface-activated porous graphene. Background technique [0002] As a two-dimensional carbon atom crystal, graphene has a high specific surface area, excellent electronic conductivity and good mechanical properties, and has become a research hotspot in the fields of chemistry, materials, and physics in recent years. However, due to the van der Waals force between graphene sheets, irreversible agglomeration tends to occur, which greatly reduces the effective specific surface area, thus limiting its application range. [0003] In order to expand the application field of graphene, the current focus of related research is mainly on the use of surface modification technology and activation technology to increase the effective specific surface area of ​​graphene. Known reports are: Kaner et al. used DVD light carving technology to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/192
Inventor 王庚超沈佳丽李星玮杨重阳
Owner EAST CHINA UNIV OF SCI & TECH
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