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 prep

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] A method for preparing graphene-based carbon nanofibers includes:

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

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

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

[0024] (4) Add 0.01 parts by weight of the graphene oxide to 5 parts by weight of N,N-dimethylformamide, and ultrasonically disperse to complete dispersion;

[0025] (5) While stirring, add 0.5 parts by weight of polyacrylonitrile, heat to 40°C and continue stirring until the polyacrylonitrile is completely dissolved to obtain a mixed solution;

...

Example Embodiment

[0028] Example 2

[0029] A method for preparing graphene-based carbon nanofibers includes:

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

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

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

[0033] (4) Adding 0.1 parts by weight of the graphene oxide to 20 parts by weight of N,N-dimethylformamide, and ultrasonically dispersing to complete dispersion;

[0034] (5) While stirring, add 1.5 parts by weight of polyacrylonitrile, heat to 50°C and continue stirring until the polyacrylonitrile is completely dissolved to obtain a mixed solution;

[...

Example Embodiment

[0037] Example 3

[0038] A method for preparing graphene-based carbon nanofibers includes:

[0039] (1) Mix 3 parts by weight of flake graphite, 400 parts by weight of concentrated sulfuric acid and 40 parts by weight of phosphoric acid, slowly add 16 parts by weight of potassium permanganate, and stir at 50°C for 12 hours;

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

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

[0042] (4) Add 0.05 parts by weight of the graphene oxide to 10 parts by weight of N,N-dimethylformamide, and ultrasonically disperse to complete dispersion;

[0043] (5) While stirring, add 1.0 part by weight of polyacrylonitrile, heat to 45°C and continue stirring until the polyacrylonitrile is completely dissolved to obtain a mixed solution;

[0044] ...

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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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