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Preparation method of active porous graphene

A technology of porous graphene and graphene, which is applied in the field of preparation of active porous graphene, can solve the problems of low activity, poor electrical conductivity of graphene, and limited commercial application, and achieve high specific surface area, increased activity, and high magnification Effect of charge and discharge performance

Inactive Publication Date: 2015-05-20
苏州容电储能科技有限公司
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Problems solved by technology

However, the graphene prepared by this technology has poor conductivity and low activity, which limits its commercial application in the field of energy storage.

Method used

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  • Preparation method of active porous graphene

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preparation example Construction

[0026] Such as figure 1 The preparation method of the shown active porous graphene is characterized in that: first, a solid mixture of graphene oxide and a chemical blowing agent is prepared. After that, the expanded graphene is prepared; next, the activated product of graphene and strong base is prepared. Subsequently, the active microporous graphene is prepared; finally, the finished product is obtained through the second pore forming.

[0027] As far as a preferred embodiment of the present invention is concerned, the process involved in preparing the solid mixture of graphene oxide and chemical foaming agent is: adding graphite oxide to a mixed solution of water and ethanol at pH=9 to 10, the The volume ratio of the mixed solution of water and ethanol is 2:1. Afterwards, stirring by magnetic force for 1 to 10 hours, and then ultrasonically dispersing for 0.5 to 2 hours to form a graphene oxide colloidal dispersion. During this period, the concentration of graphene oxide...

Embodiment 1

[0032] Add 0.1g of graphite oxide to 200mL of water and ethanol mixed solution (the volume ratio of water and ethanol is 2:1), and stir magnetically for 2 hours. Thereafter, ultrasonic dispersion was performed for 0.5 hours to form a graphene oxide colloidal dispersion. Then, 0.4 g of ammonium bicarbonate was added, stirred for 2 hours, excess ammonium bicarbonate was removed by filtration, and a solid mixture of graphene oxide and ammonium bicarbonate was obtained after drying. Subsequently, the solid mixture was placed in a tube furnace for puffing reduction in a reducing atmosphere of hydrogen and nitrogen.

[0033] Specifically, during the expansion and reduction period, gradually increase from room temperature to 500°C, control the heating rate to 8°C / min, and hold at 200°C for 15 minutes, and then hold at 500°C for 1.5 hours to obtain expanded graphene .

[0034] Subsequently, the expanded graphene was mixed with sodium hydroxide, and heated at 450° C. for 1 hour to ma...

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Abstract

The invention relates to a preparation method of active porous graphene, which is characterized by comprising the following steps: preparing a solid mixture of graphene oxide and a chemical foaming agent; preparing expanded graphene, and preparing an activation product of graphene and strong alkali; preparing active microporous graphene; and finally, carrying out secondary pore forming to obtain the finished product. The finished product has higher tap density, and has properly proportional mesoporous structure and macroporous structure; and the pores provide higher specific area. The carbonization treatment technique is performed to greatly enhance the activity of the porous graphene. When the active porous graphene is used in a capacitor electrode material, the macroporous structure provides quick migration channels for the electrolyte, and the mesoporous structure has equivalent size to ions in the organic electrolyte and is beneficial to quick adsorption and desorption of the ions, so that the capacitor has favorable high-rate charge / discharge performance.

Description

technical field [0001] The invention relates to a preparation method of graphene, in particular to a preparation method of active porous graphene. Background technique [0002] Graphene is a material with a single-layer sheet structure composed of carbon atoms. Graphene is almost completely transparent, absorbing only 2.3% of light; the thermal conductivity is as high as 5300W / m K, higher than that of carbon nanotubes and diamonds; the electron mobility of graphene at room temperature exceeds 15000cm 2 / V s, more than carbon nanotubes or silicon crystals; the resistivity of graphene is only 10 -8 Ω·m, lower than copper or silver, is the material with the smallest resistivity in the world. Because graphene has the advantages of good transparency, low resistivity, and fast electron migration, it can be used to manufacture transparent touch screens, light panels, and solar cells. [0003] Graphene has a huge theoretical specific surface area, stable physical and chemical pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 谢贤宁林群刘颖丹张顺中严玲
Owner 苏州容电储能科技有限公司
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