Graphene-polypyrrole composite aerogel and preparation method and application thereof

A composite aerogel and composite hydrogel technology, applied in the field of nanoporous materials, can solve the problems of inhibiting the high specific surface area of ​​graphene, unfavorable application of graphene aerogel, not in line with energy saving and environmental protection, etc. production, high specific capacitance properties, good mechanical properties

Active Publication Date: 2016-03-02
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is difficult to avoid the use of high temperature and high pressure, toxic and harmful chemicals in the process of preparing graphene aerogels by these methods, the operation is complicated, the cost is high, and it does not conform to the concept of energy saving and environmental protection. It exhibits poor mechanical properties, which is not conducive to the practical application of graphene aerogels. Finally, due to the strong Π-Π interaction between graphene sheets during the assembly process of graphene, resulting in Severe stacking phenomenon, which seriously inhibits the advantages of graphene's own high specific surface area

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  • Graphene-polypyrrole composite aerogel and preparation method and application thereof
  • Graphene-polypyrrole composite aerogel and preparation method and application thereof
  • Graphene-polypyrrole composite aerogel and preparation method and application thereof

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preparation example Construction

[0044] As one of typical implementation cases, a preparation method of graphene-polypyrrole composite airgel may comprise the following steps:

[0045] (1) In the acidic aqueous solution, graphene oxide is added, mechanically stirred and ultrasonically dispersed until a uniform graphene oxide solution is formed; the graphene oxide solution exists stably for at least 1-300 days;

[0046] (2) Put the graphene oxide aqueous solution at room temperature, add pyrrole monomer, stir mechanically (or magnetically) for 1 to 900 minutes, ultrasonically for 0.5 to 200 minutes, and then stand at room temperature for 1 to 28 days to obtain graphene - polypyrrole composite hydrogel;

[0047] (3) Obtaining graphene-polypyrrole composite airgel by freeze-drying or supercritical drying the graphene-polypyrrole hydrogel.

[0048] Wherein, graphene oxide can be prepared by Hummers chemical method.

[0049] The graphene-polypyrrole composite airgel of the present invention can be used as an ele...

Embodiment 1

[0053] Example 1: The graphene oxide dispersion liquid was configured into a solution of 8 mg / mL, stirred for 20 minutes, and ultrasonicated for 30 minutes to obtain a uniformly dispersed graphene oxide solution; 10 mL of the solution was taken, and 16.5 μL of pyrrole monomer was added thereto, Stir for 30 minutes, and then sonicate for 15 minutes; the obtained uniformly mixed dispersion of graphene oxide and pyrrole is left at room temperature for 7 days to obtain a graphene-polypyrrole composite hydrogel. Dissolving and replacing the obtained hydrogel with ethanol to obtain a graphene-polypyrrole composite alcohol gel, and then drying the graphene-polypyrrole composite alcohol gel through supercritical carbon dioxide to obtain a graphene-polypyrrole composite airgel. The ratio of the airgel starting material graphene oxide to pyrrole monomer is 5:1, which is denoted as GP5.

[0054] The structure and performance parameters of the graphene-polypyrrole composite airgel (GP5) o...

Embodiment 2

[0055] Example 2: The graphene oxide dispersion liquid was configured into a solution of 8 mg / mL, stirred for 20 minutes, and ultrasonicated for 30 minutes to obtain a uniformly dispersed graphene oxide solution; 10 mL of the solution was taken, and 27.5 μL of pyrrole monomer was added thereto, Stir for 20 minutes, and then sonicate for 20 minutes; the obtained uniformly mixed graphene oxide and pyrrole dispersion is left at room temperature for 7 days to obtain a graphene-polypyrrole composite hydrogel. Dissolving and replacing the obtained hydrogel with ethanol to obtain a graphene-polypyrrole composite alcohol gel, and then drying the graphene-polypyrrole composite alcohol gel through supercritical carbon dioxide to obtain a graphene-polypyrrole composite airgel. The ratio of the airgel starting material graphene oxide to pyrrole monomer is 3:1, which is denoted as GP3. Figure 1a It is the scanning electron micrograph of the graphene-polypyrrole composite airgel that makes ...

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Abstract

The invention discloses graphene-polypyrrole composite aerogel and a preparation method and application thereof. The aerogel is mainly formed by compositing graphene and polypyrrole and has the advantages of being appropriate in pore diameter, large in porosity, high in specific surface area, low in density, good in electric conductivity of 0.1-100 S / m, high in energy storage modulus and the like. The preparation method of the aerogel comprises the steps that oxidized graphene and pyrrole monomers are taken as raw materials, the oxidized graphene is dispersed into uniform and stable dispersion liquid in an acidic or neutral environment, the oxidized graphene and the pyrrole are mixed evenly through mechanical stirring and ultrasound, standing is performed on gel at room temperature, and then drying is performed to obtain the graphene-polypyrrole composite aerogel. The aerogel obtained through the method is excellent in comprehensive performance, can serve as an electrode material of a supercapacitor, an adsorbing agent for aromatic organic dye and the like and is simple in preparation technology, low in energy consumption, green, environmentally friendly and suitable for mass production.

Description

technical field [0001] The invention specifically relates to a graphene-polypyrrole composite airgel and its preparation method and application, belonging to the technical field of nanoporous materials. Background technique [0002] Graphene is based on Sp 2 The honeycomb crystal structure formed by the closely arranged hybridized carbon atoms is only the thickness of one carbon atom layer (0.34nm), which is the thinnest material found so far. Graphene can be imagined as an atomic grid formed by carbon atoms and their covalent bonds. The preparation method of graphene has gradually expanded from the initial tape tearing method / slight friction method to various other methods, such as silicon carbide surface epitaxial growth, metal surface growth, colloidal chemical synthesis, etc. The structure of graphene is very stable, the carbon-carbon bond is only The connection between carbon atoms inside graphene is very flexible. When an external force is applied to graphene, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/04C08K3/04C08G73/06C08J9/28H01G11/38
Inventor 张学同孙瑞
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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