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Graphene-based carbon nanofiber preparation method

A carbon nanofiber and graphene-based technology, applied in the field of graphene-based carbon nanofiber preparation, can solve the problem of low specific surface area

Inactive Publication Date: 2017-03-22
过冬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, compared with CNTs and graphene, the specific surface area of ​​CNFs prepared by electrospinning is usually lower, which limits its application in supercapacitors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of graphene-based carbon nanofibers, comprising:

[0021] (1) Mix the flake graphite of 2 weight parts, the concentrated sulfuric acid of 300 weight parts and the phosphoric acid of 30 weight parts, slowly add the potassium permanganate of 15 weight parts, stir at 45 ℃ for 9 hours;

[0022] (2) At 0° C., add 300 parts by weight of deionized water and 20 parts by weight of hydrogen peroxide at a concentration of 30 wt % to the mixture, and stir for 5 minutes;

[0023] (3) separate and successively wash the product with deionized water, hydrochloric acid of 10wt% concentration and absolute ethanol, and vacuum-dry to obtain graphene oxide;

[0024] (4) Add 0.01 parts by weight of the graphene oxide into 5 parts by weight of N,N-dimethylformamide, and ultrasonically disperse until completely dispersed;

[0025] (5) While stirring, add 0.5 parts by weight of polyacrylonitrile, heat to 40°C and continue stirring until the polyacrylonitrile is completely ...

Embodiment 2

[0029] A preparation method of graphene-based carbon nanofibers, comprising:

[0030] (1) 5 parts by weight of flake graphite, the concentrated sulfuric acid of 500 parts by weight and the phosphoric acid of 60 parts by weight are mixed uniformly, slowly add the potassium permanganate of 20 parts by weight, and stir at 55 DEG C for 18 hours;

[0031] (2) At 5°C, add 500 parts by weight of deionized water and 50 parts by weight of hydrogen peroxide at a concentration of 30 wt% to the mixture, and stir for 10 minutes;

[0032] (3) separate and wash the product successively with deionized water, 30wt% concentration of hydrochloric acid and absolute ethanol, and vacuum-dry to obtain graphene oxide;

[0033] (4) Add 0.1 parts by weight of the graphene oxide into 20 parts by weight of N,N-dimethylformamide, and ultrasonically disperse until completely dispersed;

[0034] (5) While stirring, add 1.5 parts by weight of polyacrylonitrile, heat to 50°C and continue stirring until the p...

Embodiment 3

[0038] A preparation method of graphene-based carbon nanofibers, comprising:

[0039] (1) The flake graphite of 3 weight parts, the concentrated sulfuric acid of 400 weight parts and the phosphoric acid of 40 weight parts are mixed uniformly, slowly add the potassium permanganate of 16 weight parts, stir 12 hours at 50 ℃;

[0040] (2) At 2° C., add 400 parts by weight of deionized water and 30 parts by weight of hydrogen peroxide at a concentration of 10 wt % to the mixture, and stir for 6 minutes;

[0041] (3) separate and wash the product successively with deionized water, hydrochloric acid of 20wt% concentration and absolute ethanol, and vacuum-dry to obtain graphene oxide;

[0042] (4) Add 0.05 parts by weight of the graphene oxide into 10 parts by weight of N,N-dimethylformamide, and ultrasonically disperse until completely dispersed;

[0043] (5) While stirring, add 1.0 parts by weight of polyacrylonitrile, heat to 45°C and continue stirring until the polyacrylonitrile ...

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Abstract

The invention provides a graphene-based carbon nanofiber preparation method, characterized in that polyacrylonitrile is taken as a carbon source, oxidized graphene prepared by an improved method provided by the invention is added, then an electrospinning technique is used for preparing and obtaining oxidized graphene / polypropylene nanofiber, then pre-oxidation and carbonization steps are adopted to prepare and obtain graphene-based carbon nanofiber. The graphene-based carbon nano material prepared by the method provided by the invention is very easily dispersed, the overlapping of sheets is reduced, and the removal of a functional group at high temperature is facilitated, so that the conductivity and specific surface area of nanofiber are improved. Under the condition that the current density is 1A / g, the specific capacitance is 468F / g.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for preparing graphene-based carbon nanofibers. Background technique [0002] So far, due to their very stable physical and chemical properties, very large specific surface area, and controllable pore structure, porous carbons with various shapes and textures have been considered as electrode materials for supercapacitors, which can be widely used in commercial applications. The capacitance value of a single cell in a supercapacitor can be as high as 5000F. In addition, in recent nanoscience and nanotechnology research progress, many researchers have focused on nanostructured carbon materials such as carbon nanotubes (CNTs), carbon nanofibers (CNFs), graphene and other ideal electrode materials for supercapacitors. and found that they have very high specific capacitance values. [0003] Among various nanocarbon materials in recent years, graphene and continuous c...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F9/12C01B32/15C01B32/184
CPCD01F9/22C01P2006/12D01F9/12
Inventor 过冬
Owner 过冬
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