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Controllable preparation method of two-dimensional porous graphene oxide

A technology of porous structure and graphene, which is applied in the direction of graphene, chemical instruments and methods, carbon compounds, etc., can solve the problems of preparing two-dimensional porous structure graphene oxide, and achieve low production cost, mild reaction conditions and high rate performance Improved effect

Active Publication Date: 2019-12-24
BAOJI UNIV OF ARTS & SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The above-mentioned published documents are all about the technical method of graphene, and there are basically no reports about the preparation of two-dimensional porous structure graphene oxide.

Method used

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  • Controllable preparation method of two-dimensional porous graphene oxide
  • Controllable preparation method of two-dimensional porous graphene oxide
  • Controllable preparation method of two-dimensional porous graphene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 50 mg of graphene oxide to 50 mL of deionized water, stir at room temperature for 6 hours, and then sonicate for 1 hour to obtain a graphene oxide dispersion. Add 450 mg of ammonium persulfate to it to obtain a mixed dispersion. The mixed dispersion is stirred and refluxed at 80°C After 4 hours, it is naturally cooled to room temperature. After centrifugation, the solid is washed with deionized water and dried to obtain a two-dimensional porous structure graphene oxide nanomaterial.

[0033] The products were characterized by X-ray diffractometer and transmission electron microscope, the results are as follows figure 1 with figure 2 Shown by figure 1 It can be seen that the product obtained is graphite oxide, which has a lower crystallinity, and is determined by figure 2 It can be seen that the graphene oxide has a two-dimensional sheet-like shape, and the surface of the sheet has a rich porous structure.

Embodiment 2

[0035] Add 250 mg of ammonium persulfate to the graphene oxide dispersion, and the other steps are the same as in Example 1, to prepare a two-dimensional porous structure graphene oxide nanomaterial, such as image 3 Shown.

Embodiment 3

[0037] Add 350 mg of ammonium persulfate to the graphene oxide dispersion, and the other steps are the same as in Example 1, to prepare a two-dimensional porous structure graphene oxide nanomaterial, such as Figure 4 Shown.

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Abstract

The invention discloses a controllable preparation method of two-dimensional porous-structure graphene oxide. The method comprises the following steps: adding ammonium persulfate into a graphene oxidedispersion solution, wherein the mass ratio of the ammonium persulfate to the graphene oxide is (5 to 11) to 1; heating and reflowing; naturally cooling to room temperature to obtain the two-dimensional porous-structure graphene oxide. According to the method disclosed by the invention, the specific surface area and the pore volume of the two-dimensional porous-structure graphene oxide are remarkably increased when being compared with the specific surface area and the pore volume of graphite oxide; the obtained two-dimensional porous-structure graphene oxide is reduced to obtain porous graphene; compared with a manner of directly reducing the graphite oxide, the specific capacitance is increased by 39.2 percent to 87.6 percent, the electrical conductivity is improved by 7.67 percent to 19.4 percent, and the rate performance is improved; the two-dimensional porous-structure graphene oxide can be applied to supercapacitor materials; the method has moderate reaction conditions; a pore forming agent is not added, and the assistance of a template is not needed; the production cost is low, and industrial production can be realized.

Description

Technical field [0001] The invention belongs to the technical field of graphene preparation, and specifically relates to a method for preparing graphene oxide with a two-dimensional porous structure. Background technique [0002] Graphene is composed of a single layer of carbon atoms through SP 2 The hexagonal honeycomb two-dimensional crystal plane structure composed of hybrid orbitals is the basic unit for constructing zero-dimensional fullerenes, one-dimensional nanotubes and three-dimensional graphite, and the basic unit for other dimensional carbon materials. It has excellent properties such as high electrons. Mobility, high specific surface area, good thermal conductivity, high strength and high Young's modulus and other properties. It generally adopts micromechanical peeling method, epitaxial growth method, chemical vapor precipitation method, graphite oxide reduction method, and carbon nanotube cutting method. [0003] Among them, the graphite oxide reduction method is con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/198H01G11/24H01G11/36
CPCC01B2204/22C01P2002/72C01P2004/04H01G11/24H01G11/36Y02E60/13
Inventor 张改妮任莉君胡登卫苗磊
Owner BAOJI UNIV OF ARTS & SCI
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