Method for preparing high-dispersion nitrogen-doped graphene

A nitrogen-doped graphene, highly dispersed technology, applied in the field of preparation of highly dispersed nitrogen-doped graphene, can solve the problems of graphene surface doping, nitrogen loss, and low nitrogen content in the product, so as to achieve less nitrogen loss and easy High-volume production and high-yield effects

Inactive Publication Date: 2016-01-20
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although this method has a simple process, it can only achieve graphene surface doping, and with the increase of heat treatment temperature, nitrogen loss is serious, and the nitrogen content in the product is low

Method used

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  • Method for preparing high-dispersion nitrogen-doped graphene
  • Method for preparing high-dispersion nitrogen-doped graphene
  • Method for preparing high-dispersion nitrogen-doped graphene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 1.0g expanded graphite, 1.0gNaNO 3 , 3.0 g KMnO 4 In a 100mL beaker, slowly add 60mL of concentrated sulfuric acid and stir for 12h. Remove the unreacted expanded graphite floating on the upper layer of the solution, pour the mixed solution into 400mL of water three times and stir, after the beaker is cooled, add hydrogen peroxide (30%, mass fraction) drop by drop until bright yellow graphene oxide (GO) solution is obtained ; centrifuged and washed 3 times with three times of water to obtain brown-yellow GO sol. Disperse 1.0g of P123 into 300mL of water, stir vigorously to produce a large amount of white foam, so that P123 can be fully dispersed. Then GO was added to the P123 dispersion, and the stirring was continued for 30 min to obtain a GO dispersion. 0.4g formaldehyde solution was added to the above GO dispersion; 0.5g pyrrole (Py) was dispersed in 30mL ethanol and 30mL water mixture, ultrasonically dispersed and added to the GO dispersion. The GO dispers...

Embodiment 2

[0031] Weigh 1.0g expanded graphite, 1.0gNaNO 3 , 3.0 g KMnO 4 In a 100mL beaker, slowly add 60mL of concentrated sulfuric acid and stir for 12h. Remove the unreacted expanded graphite floating on the upper layer of the solution, pour the mixed solution into 400mL of water three times and stir, after the beaker is cooled, add hydrogen peroxide (30%, mass fraction) drop by drop until bright yellow graphene oxide (GO) solution is obtained ; Centrifuged and washed 3 times with three times of water to obtain brown-yellow G0 sol. Disperse 1.0 g of P123 into 300 mL of water, stir vigorously to generate a large amount of white foam, so that P123 is fully dispersed, then add GO to the P123 dispersion, and continue stirring for 30 min to obtain a GO dispersion. 0.4g formaldehyde solution was added to the above GO dispersion; 0.5g pyrrole (Py) was dispersed in 30mL ethanol and 30mL water mixture, ultrasonically dispersed and added to the GO dispersion. The GO dispersion was transferr...

Embodiment 3

[0033] Weigh 1.0g expanded graphite, 1.0gNaNO 3 , 3.0 g KMnO 4In a 100mL beaker, slowly add 60mL of concentrated sulfuric acid and stir for 12h. Remove the unreacted expanded graphite floating on the upper layer of the solution, pour the mixed solution into 400mL of water three times and stir, after the beaker is cooled, add hydrogen peroxide (30%, mass fraction) drop by drop until bright yellow graphene oxide (GO) solution is obtained ; centrifuged and washed 3 times with three times of water to obtain brown-yellow GO sol. Disperse 1.0 g of P123 into 300 mL of water, stir vigorously to generate a large amount of white foam, so that P123 is fully dispersed, then add GO to the P123 dispersion, and continue stirring for 30 min to obtain a GO dispersion. 0.4g formaldehyde solution was added to the above GO dispersion; 0.4g pyrrole (Py) was dispersed in 30mL ethanol and 30mL water mixture, ultrasonically dispersed and added to the GO dispersion. The GO dispersion was transferre...

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Abstract

The invention discloses a method for preparing high-dispersion nitrogen-doped graphene. The method comprises the following steps: under the condition of water bath of 80 DEGC, in the absence of other oxidant, performing in-situ oxidation polymerization of pyrrole on the surface of oxidized graphene to obtain polypyrrole (PPy) by utilizing the oxidizability of oxidized graphene (GO), thereby obtaining a PPy/rGO compound, and carrying out high-temperature calcination on the PPy/rGO compound, to obtain the high-dispersion nitrogen-doped graphene. The PPy layer can not only be used as a nitrogen-doped nitrogen source, but also be uniformly polymerized on the surface of GO to effectively expand a GO flake layer, and thus GO can be prevented from agglomeration; as oxidized graphene and polypyrrole are uniformly 'grown' together, nitrogen loss in the calcinations process can be effectively prevented, and thus the high-dispersion nitrogen-doped graphene with high nitrogen content can be obtained. The method for preparing high-dispersion nitrogen-doped graphene only relates to simple water bath reaction and thermal treatment process, the whole preparation process is simple, and large-capacity production can be facilitated.

Description

technical field [0001] The invention relates to a preparation method of highly dispersed nitrogen-doped graphene. Background technique [0002] Graphene, as a two-dimensional carbon material composed of carbon atoms densely packed periodically into a hexagonal honeycomb structure, has excellent properties such as electrical conductivity and thermal conductivity, and has received extensive attention and research in different fields. In recent years, people have used different methods to regulate graphene to expand the application range of graphene, such as shape control. Two-dimensional graphene nanosheets, one-dimensional graphene nanorods, and zero-dimensional graphene quantum dots have been widely reported in different fields. In addition to shape control, chemical doping, that is, introducing another atom, such as nitrogen and boron atoms, into the graphene lattice is another common method of graphene modification. After nitrogen atoms are doped into the graphene skelet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 曹勇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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