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Preparation method of super-elasticity graphene aerogel

A graphene aerogel, superelasticity technology, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve problems such as limiting production efficiency, increasing production costs, etc., achieving broad market prospects, reducing preparation costs, The effect of excellent electrochemical performance

Active Publication Date: 2017-06-09
戴天元
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The shape of the graphene airgel prepared by these two methods will be similar to the shape of the container, because the graphene will shrink in proportion to the shape of the container when it gels [W.F.Chen, L.F.Yan, L.Y.Chang, Y.Z.Wu, D. Li, Nanoscale, 2011,3,3132], that is to say, the airgel sample can only be obtained by changing the shape of the container, which undoubtedly increases the production cost and limits the production efficiency. Therefore, it involves the preparation of a The preparation method of superelastic graphene airgel, the shape of the final airgel can be adjusted by changing the shape of the polymer template, the preparation process is simple and fast

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of the superelastic graphene airgel that the present embodiment relates to, its concrete process step comprises:

[0022] (1) Add 5 mg of hydrazine hydrate as a reducing agent to a reaction vessel containing 10 ml of a graphene oxide solution with a concentration of 5 mg / ml, and stir in a water bath at 20° C. for 20 minutes so that the graphene oxide solution and hydrazine hydrate fully undergo an oxidation-reduction reaction, Prepare the mixed solution containing graphene for subsequent use;

[0023] (2), trim the polyurethane foam into the same shape as the graphene airgel that needs to be prepared with a trimming tool at room temperature, and the volume of the processed polyurethane foam block is 4.8-5.2cm 3 , put the polyurethane foam block into the mixed solution to absorb the mixed solution for 5-30 minutes, then place the reaction vessel in a 70°C oil bath and heat it for 20 hours to obtain a graphene-polyurethane hydrogel, remaining hydraz...

Embodiment 2

[0028] The preparation method of the superelastic graphene airgel that the present embodiment relates to, its concrete process step comprises:

[0029] (1), adding 150 mg of ascorbic acid as a reducing agent in a reaction dish containing 10 ml of a graphene oxide solution with a concentration of 7.5 mg / ml, stirred in a water bath at 10° C. for 60 minutes to make the graphene oxide solution and ascorbic acid fully undergo an oxidation-reduction reaction, and prepare Obtain the mixed solution containing graphene for subsequent use;

[0030] (2), trim the polypropylene foam block into the same shape as the graphene airgel that needs to be prepared with a trimming tool at room temperature, and the volume of the processed polypropylene foam block is 4.8-5.2cm 3 , put the polypropylene foam block into the mixed solution to absorb the mixed solution for 30 minutes, then place the reaction vessel in an oil bath at 100°C and heat it for 8 hours to obtain a graphene-polypropylene hydrog...

Embodiment 3

[0035] The preparation method of the superelastic graphene airgel that the present embodiment relates to, its concrete process step comprises:

[0036] (1) Add 150 mg of sodium borohydride as a reducing agent to a reaction vessel containing 10 ml of a graphene oxide solution with a concentration of 12 mg / ml, and stir in a water bath at 30° C. for 100 minutes so that the graphene oxide solution and sodium borohydride are fully oxidized and reduced Reaction, prepare the mixed solution containing graphene for subsequent use;

[0037] (2), trim the polyethylene terephthalate foam block into the same shape as the graphene airgel that needs to be prepared with a trimming tool at room temperature, and the processed polyethylene terephthalate foam The block has a volume of 5 cm 3 , put the polyethylene terephthalate foam block into the mixed solution to absorb the mixed solution for 30 minutes, then place the reaction vessel in an oil bath at 60°C and heat it for 24 hours to obtain g...

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Abstract

The invention belongs to the technical field of aerogel preparation and relates to a preparation method of super-elasticity graphene aerogel. The preparation method includes: adding a proper amount of reducing agent into oxidized graphene dispersion, using a polymer foam block to adsorb the oxidized graphene dispersion, and performing oil path heating on the foam block to reduce oxidized graphene; drying a sample through freeze-drying; removing polymer foam through high-temperature thermal treatment to obtain graphene aerogel. Shape of final graphene aerogel is regulated by designing shape of the polymer foam, but the shape of the graphene aerogel is regulated by changing shape of containers in other preparation processes of graphene aerogel, so that preparation cost of the graphene aerogel is lowered greatly, and the graphene aerogel in complex shape can be prepared. The preparation method is simple in preparation process, ingenious in design concept, easy-to-get in raw material for preparation and high inpreparation efficiency, and the graphene aerogel prepared by the method is excellent in electrochemical performance, friendly to application environment and wide in market prospect.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of airgel preparation, and relates to a preparation method of graphene airgel, in particular to a preparation method of superelastic graphene airgel, in which the final prepared graphite is regulated by changing the shape of a polymer template The shape of ene airgel. [0003] Background technique: [0004] Graphene is a two-dimensional sheet material composed of a single layer of carbon atoms, which has excellent mechanical, electrical and thermal properties. At present, the preparation methods of graphene mainly include: mechanical exfoliation method, chemical vapor deposition method, crystal surface epitaxial growth method and redox method. Among them, the redox method is the most likely method for the industrial production of graphene. The cheap graphite is oxidized and exfoliated into graphene oxide by the Hummers method, and the graphene oxide dispersion is self-assembled into a three-dimensio...

Claims

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Application Information

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IPC IPC(8): C01B32/184
CPCC01B2204/22C01P2004/03C01P2006/10C01P2006/16
Inventor 戴天元刘敬权李晨蔚姜德刚
Owner 戴天元
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