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Preparation method of porous graphene

A porous graphene and graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as difficult precise preparation of graphene and restrictions on graphene application, and achieve excellent electrochemical performance and mild conditions , the effect of simple process

Active Publication Date: 2016-09-07
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also many studies on graphene materials, but most of them are concentrated on hydrothermal method or research on the composite of graphene and conductive polymers, metal oxides, etc. It is difficult to realize the precise preparation of graphene, which restricts the development of graphene. Applications in precision electronics

Method used

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Embodiment 1

[0023] Graphene oxide used in the present embodiment is to be raw material with flake graphite, is prepared by traditional hummers method; Ionic liquid is 1-butyl-3-methylimidazole L lactate, prepares porous graphene:

[0024] Step 1: Weigh 400 mg of freeze-dried graphene oxide GO powder, dissolve it in 40 mL of distilled water, disperse it ultrasonically for 1 h to form a graphene oxide aqueous solution, add 1 mL of hydrogen peroxide solution with a mass concentration of 30% drop by drop, and stir well 2h;

[0025] Step 2: Add 200 mg of 1-butyl-3-methylimidazole L-lactate ionic liquid dropwise to the dispersion obtained in step 1, and stir thoroughly for 2 hours;

[0026] Step 3: transfer the mixed solution obtained in step 2 to a 50mL hydrothermal reaction kettle, and react at 140°C for 12 hours;

[0027] Step 4: Freeze-drying the gel obtained by the hydrothermal reaction in Step 3 to obtain the porous graphene.

[0028] The obtained porous graphene is characterized, and t...

Embodiment 2

[0030] Graphene oxide used in the present embodiment is to be raw material with flake graphite, is prepared by traditional hummers method; Used ionic liquid is 1,2-ethylenediamine nitrate, prepares porous graphene material:

[0031] Step 1: Weigh 400mg of lyophilized GO powder, dissolve it in 40mL of distilled water, disperse it by ultrasonic for 1h, make it fully dispersed to form a graphene oxide aqueous solution, and add 1mL of hydrogen peroxide solution with a mass concentration of 30% drop by drop; and Fully stir for 2h;

[0032] Step 2: Add 200 mg of 1,2-ethylenediamine nitrate ionic liquid dropwise to the dispersion obtained in step 1, and stir thoroughly for 2 hours;

[0033] Step 3: Transfer the mixed solution obtained in the above steps to a 50mL hydrothermal reaction kettle, and react at 140°C for 14 hours;

[0034] Step 4: Freeze-drying the gel obtained by the hydrothermal reaction in Step 3 to obtain the porous graphene.

Embodiment 3

[0036] The graphene oxide used in the present embodiment is to be raw material with flake graphite, the improvement reported by W.S.Hummers Jr., R.E.Offeman, Preparation of graphitic oxide, J.Am.Chem.Soc.80 (6) (1958) 1339 prepared by the two-step method; the ionic liquid used is 1,2-ethylenediamine trifluoromethanesulfonate, and the porous graphene material is prepared:

[0037] Step 1: Weigh 400 mg of lyophilized GO powder, dissolve it in 40 mL of distilled water, and disperse it by ultrasonic for 1 h to make it fully dispersed to form a graphene oxide aqueous solution, add 1 mL of hydrogen peroxide solution with a mass concentration of 30% drop by drop, and Fully stir for 2h;

[0038] Step 2: Add 240 mg of 1,2-ethylenediamine trifluoromethanesulfonate ionic liquid dropwise to the dispersion obtained in Step 1, and stir thoroughly for 2 hours;

[0039] Step 3: Transfer the mixed solution obtained in the above steps to a 50mL hydrothermal reaction kettle, and react at 160°C ...

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Abstract

The invention relates to a preparation method of porous graphene and belongs to the technical field of graphene super-capacitor materials. The technical scheme adopted by the invention is that the preparation method comprises the following steps: adding different proportions of hydrogen peroxide into an aqueous solution of graphene oxide, then adding a certain quantity of ionic liquid, fully and uniformly stirring, performing hydro-thermal reaction to obtain graphene gel, performing freeze-drying treatment to obtain the porous graphene. The porous graphene prepared by the preparation method provided by the invention is large in specific surface area and simple in preparation processes and has a wide application prospect in the fields of super-capacitors, sewage treatment, oil absorption and the like.

Description

technical field [0001] The invention belongs to the technical field of graphene supercapacitor materials, and in particular relates to a preparation method of porous graphene. Background technique [0002] Supercapacitor materials are a key field for the application of supercapacitors in real life, and they are also a major bottleneck restricting the application of supercapacitors so far. At present, electronic devices are mainly developing in the direction of smallness and precision, which requires the volume of supercapacitors to be small enough, so that there are higher requirements for the energy density and power density of supercapacitor materials. Most of the current supercapacitor devices are mainly based on cheap carbon materials based on the electric double layer capacitor storage mechanism, but the possibility of obtaining a higher energy density is too small. Summarizing the development of capacitor materials in recent years, although the performance of carbon n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B2204/32C01P2002/72C01P2004/03
Inventor 闵永刚马寸亮朱祎祎肖壮清张栋
Owner NANJING UNIV OF POSTS & TELECOMM
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