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Method for preparing graphene and graphene

A graphene and graphene technology, applied in the field of materials, can solve the problems of large differences in G performance and failure to meet the requirements of electrochemical energy storage performance, etc., to achieve increased conjugation effects, reduced number of layers, and improved energy storage performance Effect

Inactive Publication Date: 2018-09-04
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composition and structure (such as sheet size and thickness) of G prepared by this method are more affected by the preparation process, resulting in a large difference in the performance of the obtained G
When it is directly applied to supercapacitors (ESC), it often fails to meet the expected electrochemical energy storage performance requirements.

Method used

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  • Method for preparing graphene and graphene
  • Method for preparing graphene and graphene
  • Method for preparing graphene and graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of graphene provided by the present embodiment is made like this:

[0044] Weigh 1g of fully dried natural flake graphite and 1g NaNO 3 Mix in a container and inject 50mL of concentrated H 2 SO 4 , the whole system was magnetically stirred in an ice bath environment for 1 h. Then slowly add 5 g KMnO to the solution 4 , keep stirring for 2h, and keep the system temperature at 5°C. The temperature was then raised to 35 °C and stirring was continued for 2 h. After that, 100 mL of deionized water was slowly dropped into it, and the temperature was raised to 98 ° C. After 15 min, 240 ml of 60 ° C deionized water was added to the container again, followed by 10 mL of H 2 o 2 , after the solution turns from brown yellow to golden yellow, the reaction ends. Finally, the above product was diluted with deionized water, centrifuged at 12000 rpm for 15 min to retain the precipitate, and repeated 6 times. After the above solution was sonicated for 1 h, it was centrifu...

Embodiment 2

[0048] A kind of graphene provided by the present embodiment is made like this:

[0049] Weigh 1g of fully dried natural flake graphite and 1g NaNO 3 Mix in a container and inject 50mL of concentrated H 2 SO 4 , the whole system was magnetically stirred in an ice bath environment for 1 h. Then slowly add 5 g KMnO to the solution 4 , keep stirring for 2h, and keep the system temperature at 5°C. The temperature was then raised to 35 °C and stirring was continued for 2 h. After that, 100 mL of deionized water was slowly dropped into it, and the temperature was raised to 98 ° C. After 15 min, 240 ml of 60 ° C deionized water was added to the container again, followed by 10 mL of H 2 o 2 , after the solution turns from brown yellow to golden yellow, the reaction ends. Finally, the above product was diluted with deionized water, centrifuged at 12000 rpm for 15 min to retain the precipitate, and repeated 6 times. After the above solution was sonicated for 1 h, it was centrifuge...

Embodiment 3

[0053] A kind of Graphene provided by the present embodiment is made like this:

[0054] Weigh 1g of fully dried natural flake graphite and 1g NaNO 3 Mix in a container and inject 50mL of concentrated H 2 SO 4 , the whole system was magnetically stirred in an ice bath environment for 1 h. Then slowly add 5 g KMnO to the solution 4 , keep stirring for 2h, and keep the system temperature at 5°C. The temperature was then raised to 35 °C and stirring was continued for 2 h. After that, 100 mL of deionized water was slowly dropped into it, and the temperature was raised to 98 ° C. After 15 min, 240 ml of 60 ° C deionized water was added to the container again, followed by 10 mL of H 2 o 2 , after the solution turns from brown yellow to golden yellow, the reaction ends. Finally, the above product was diluted with deionized water, centrifuged at 12000 rpm for 15 min to retain the precipitate, and repeated 6 times. After the above solution was sonicated for 1 h, it was centrifu...

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Abstract

The invention relates to the field of materials, and particularly relates to a method for preparing graphene and graphene. The method comprises the following steps: performing at least one time of high pressure homogenization treatment on a graphene oxide solution in a pressure condition of 1150-1250BAR, to obtain a first solution; after the first solution is uniformly dispersed, performing hydrothermal reaction for 5-7 hours in the condition of 170-185 DEG C, and then naturally cooling to obtain graphene. By adopting a method of preparing graphene by treating graphene oxide with a high pressure homogenization method and then reducing, the conjugation effect of the graphene oxide is improved, the interlayer spacing of the graphene oxide is increased, and the layer number is reduced, so that the electrochemical energy storage performance of the graphene prepared by reduction is promoted.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing graphene and graphene. Background technique [0002] Graphene (graphene, G), has a unique structure and excellent performance, so it has attracted widespread attention from all walks of life. Single-layer graphene sheets are composed of sp 2 A two-dimensional planar sheet crystal structure formed by hybridized carbon atoms along the direction of two covalent bonds. G exhibits high electrical conductivity, thermal conductivity and mechanical properties. In addition, its theoretical specific surface area is as high as 2675m 2 / g, if the good conductivity and open surface can be fully utilized to promote the formation of the electrode material electrolyte double layer interface and ensure the effective use of the material surface, the specific capacitance of G can reach 550F / g. [0003] At present, the commonly used preparation methods of G include: micromechanical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184H01G11/32H01G11/86
CPCC01B32/184C01B2204/20C01B2204/22C01B2204/32H01G11/32H01G11/86Y02E60/13
Inventor 江奇蒋理卢晓英
Owner SOUTHWEST JIAOTONG UNIV
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