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Preparation method of size-grading graphene aerogel

A technology of graphene airgel and graphene sheet, which is applied in the field of materials, can solve the problems that the utilization of the advantages of graphene structure does not meet the expected requirements, and achieve the effects of superior electrochemical performance, shortened ion transmission distance, and enhanced peak intensity

Active Publication Date: 2018-05-25
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the graphene airgel prepared in a single size shows good performance, the utilization of graphene structural advantages is far from meeting the expected requirements. Therefore, the preparation of electrical, optical and mechanical Graphene materials with excellent performance are of great significance

Method used

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  • Preparation method of size-grading graphene aerogel
  • Preparation method of size-grading graphene aerogel
  • Preparation method of size-grading graphene aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 1g of natural graphite powder with a particle size of 6.5 μm without any purification, 120mL of concentrated sulfuric acid with a mass fraction of 98%, and 15mL of concentrated phosphoric acid with a mass fraction of 85% in an ice-water bath and mix them. Potassium manganate, stirred for 2 hours, raised the temperature to 35°C, stirred for 20 minutes, then raised the temperature to 50°C, stirred vigorously for 8 hours, after the reaction was completed, added the prepared brown solution into ice, cooled to room temperature, added 3mL of % hydrogen peroxide solution to obtain a golden yellow solution, wash the prepared golden yellow solution with 5% dilute hydrochloric acid and distilled water to neutrality, then dialyze the washed solid for one week, freeze-dry, and prepare Graphene oxide sheets.

[0022] Graphene oxide was prepared by the same method using 1 g of natural graphite powder with a particle size of 2.6 μm without any purification.

[0023] Disperse 50mg...

Embodiment 2

[0031] 3g of natural graphite powder with a particle size of 6.5 μm without any purification, 360mL of concentrated sulfuric acid with a mass fraction of 98%, and 40mL of concentrated phosphoric acid with a mass fraction of 85% were placed in an ice-water bath and mixed, and 18g of high Potassium manganate, stirred for 3 hours, raised the temperature to 30°C, stirred for 35 minutes, then raised the temperature to 40°C, stirred vigorously for 12 hours, after the reaction was completed, added the prepared brown solution into ice, cooled to room temperature, added 9 mL of % hydrogen peroxide solution to obtain a golden yellow solution, wash the prepared golden yellow solution with 10% dilute hydrochloric acid and distilled water to neutrality, then dialyze the washed solid for one week, freeze-dry, and prepare Graphene oxide sheets.

[0032] 3 g of natural graphite powder with a particle size of 106 μm without any purification was used to prepare graphene oxide by the same method...

Embodiment 3

[0037] 5g of natural graphite powder with a particle size of 1.6 μm without any purification, 600mL of concentrated sulfuric acid with a mass fraction of 98%, and 75mL of concentrated phosphoric acid with a mass fraction of 85% were placed in an ice-water bath and mixed, and 30g of high Potassium manganate, stirred for 3 hours, raised the temperature to 40°C, stirred for 40 minutes, then raised the temperature to 60°C, stirred vigorously for 8 hours, after the reaction was completed, added the prepared brown solution into ice, cooled to room temperature, added 15mL of % hydrogen peroxide solution to obtain a golden yellow solution, wash the prepared golden yellow solution with 10% dilute hydrochloric acid and distilled water to neutrality, then dialyze the washed solid for one week, freeze-dry, and prepare Graphene oxide sheets;

[0038] Graphene oxide was prepared by the same method using 5 g of natural graphite powder with a particle size of 2.6 μm without any purification. ...

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Abstract

Disclosed is a preparation method of a size-grading graphene aerogel. The preparation method comprises mixing 1.6-106 mu m of natural graphite powder, concentrated sulfuric acid and concentrated phosphoric acid in ice-water bath, then adding in potassium permanganate and stirring for 1-3 h, increasing the temperature to 30-40 DEG C, stirring for 20-50 min, increasing the temperature to 40-60 DEG C, forced-mixing for 4-12 h, putting the mixture into ice for cooling down to room temperature, adding in hydrogen peroxide to obtain a golden solution, dialyzing washed solid for a week, and then performing freezing-drying to prepare graphene oxide sheets; uniformly dispersing the graphene oxide sheets in different sizes into ultrapure water to obtain a uniform and stable solution, adding any of ascorbic acid, sodium sulfide, hydroiodic acid and sodium bisulfite in the proportion of 2:1 by weight to the graphene oxide solution into the graphene oxide solution for thermostatic reaction at 90-120 DEG C in a reactor for 2-8 h to prepare graphene hydrogel, and then freezing-drying the graphene hydrogel to obtain the graphene aerogel. The preparation method of the size-grading graphene aerogelis simple and easy to operate, mild in reaction, capable of improving charging and discharging efficiency, excellent in electrochemical performance and applicable to scale production.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a preparation method of graphene airgel. technical background [0002] Graphene is a sp 2 A new type of two-dimensional honeycomb material with the thickness of a single molecular layer formed by the interconnection of hybridized carbon atoms. Graphene can be warped to form zero-dimensional fullerenes, curled to form one-dimensional carbon nanotubes, and stacked to form three-dimensional graphite. Graphene's unique structure makes it have excellent electrical properties, mechanical properties, optical properties and ultra-high specific surface area, etc., so it has great application value in electronic devices, biosensing, photoelectric conversion and composite materials. [0003] The structure of graphene sheets has an important impact on their properties. The current preparation methods of graphene involve methods such as chemical vapor deposition, mechanical exfoliation, ...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B32/198
CPCC01B2204/20C01B2204/22
Inventor 陈玲李雅浩郑伟超尹娟娟
Owner YANSHAN UNIV