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Honeycomb-structured graphene aerogel ball and production method thereof

A technology of graphene airgel and graphene airgel ball, which is applied in the field of honeycomb structure graphene airgel ball and its preparation, can solve the limitation of airgel shape, insufficient airgel strength and rebound ability , high cost of freeze vacuum drying, etc., to achieve the effect of low cost, rapid production, and easy availability of raw materials

Active Publication Date: 2016-06-08
杭州德烯科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The properties and preparation methods of graphene airgel reported before have the following three problems: first, the shape of the airgel is limited by the container; second, the strength and resilience of the prepared airgel are insufficient; third, freeze-drying High cost, not suitable for mass production (Sun, H.; Xu, Z.; Gao, C., Adv. Mater. 2013, 25, 2554.)
These issues limit the practical application of graphene aerogels

Method used

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  • Honeycomb-structured graphene aerogel ball and production method thereof
  • Honeycomb-structured graphene aerogel ball and production method thereof
  • Honeycomb-structured graphene aerogel ball and production method thereof

Examples

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preparation example Construction

[0030] The steps of honeycomb structure graphene airgel ball and large-scale preparation method thereof are as follows:

[0031] 1) Add 1 part by weight of graphene oxide, 20-50 parts by weight of water, and 0.1-1 part by weight of ammonia water into the reactor, and stir to obtain a slurry;

[0032] 2) Squeeze the slurry through a needle with a diameter of 100-5000 microns at a speed of 0.5-2 seconds per drop, and squeeze it into a coagulation bath to obtain graphene oxide hydrogel balls;

[0033] 3) Soak the graphene oxide hydrogel balls in 20-50 parts by weight of water, add 2-5 parts by weight of a reducing agent, and put them in an oven at 60-95 degrees Celsius to react for 10 hours to obtain reduced graphene oxide hydrogel balls ;

[0034] 4) Put the reduced graphene oxide hydrogel balls in a low-temperature environment, freeze for 1-2 hours, and then thaw at room temperature;

[0035] 5) After soaking and washing in a solvent, dry in an oven at 60 degrees Celsius for ...

Embodiment 1

[0039] 1) Add 1 weight part of graphene oxide, 20 weight parts of water, 0.1 weight part of 25% mass fraction of ammonia water in the reactor, and stir to obtain a slurry;

[0040] 2) The slurry is passed through a needle with a diameter of 100 microns at a speed of 2 seconds per drop, and squeezed into a 5wt% calcium chloride coagulation bath to obtain graphene oxide hydrogel balls;

[0041] 3) Soak the graphene oxide hydrogel balls in 20 parts by weight of water, add 2 parts by weight of sodium vitamin C, and put them in an oven at 95 degrees Celsius to react for 10 hours to obtain the reduced graphene oxide hydrogel balls;

[0042] 4) Put the reduced graphene oxide hydrogel balls in an environment of -18 degrees Celsius, freeze for 1-2 hours, and then thaw at room temperature;

[0043] 5) After fully soaking and washing in water and ethanol, dry in an oven at 60 degrees Celsius for 24 hours to obtain reduced graphene oxide airgel balls;

[0044] 6) Treat the reduced graphe...

Embodiment 2

[0046] The preparation method is basically the same as that in Example 1, except that a needle with a diameter of 5000 microns is used in step 2).

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Abstract

The invention discloses a honeycomb-structured graphene aerogel ball and a production method thereof. The production method includes the steps of firstly, well mixing graphene oxide, water and alkaline substances to obtain slurry; secondly squeezing the slurry into coagulation bath through a needle to obtain a graphene oxide gel ball; thirdly, soaking the graphene oxide gel ball into water, adding reducing agent, and performing heating reaction for 10 hours to obtain a reduced graphene oxide gel ball; fourthly, placing the reduced graphene oxide gel ball into a low-temperature environment, freezing for 1-2 hours, and unfreezing under room temperature; fifthly, drying in an oven of 60 DEG C after solvent soaking and washing to obtain a reduced graphene oxide aerogel ball; sixthly, performing high-temperature treatment on the reduced graphene oxide aerogel ball under argon protection to obtain the graphene aerogel ball. The production method has the advantages that the method is simple in process and suitable for large-scale production, and the graphene aerogel ball produced by the method is excellent in resilience, conductivity and mechanical performance.

Description

technical field [0001] The invention relates to a graphene airgel ball with a honeycomb structure and a preparation method thereof. Background technique [0002] Graphene is a layer of carbon atoms with sp 2 A two-dimensional layer of carbon atoms formed by hybrid connections. It has many excellent properties such as ultra-high strength, large specific surface area, ultra-high thermal conductivity, and carrier mobility, and has important application value in the fields of electronic devices, energy storage, and composite materials (Geim, A.K. ; Novoselov, K.S., Nature Materials 2007, 6, 183). How to convert the excellent properties of graphene into the excellent properties of macroscopic materials is an important issue in graphene research. [0003] The properties and preparation methods of graphene airgel reported before have the following three problems: first, the shape of the airgel is limited by the container; second, the strength and resilience of the prepared airge...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01P2004/03
Inventor 高超赵晓莉
Owner 杭州德烯科技集团有限公司
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