A self-supporting graphene film/polyaniline@polyaniline hierarchical structure composite electrode, preparation method and application

A graphene film and composite electrode technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve problems such as poor stability and low specific capacity, and achieve the advantages of avoiding agglomeration, reducing internal resistance and retaining flexibility. Effect

Inactive Publication Date: 2019-12-17
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the shortcomings of poor stability and low specific capacity of polyaniline conductive polymer materials in electrode materials, the purpose of the present invention is to propose a method for preparing a graphene self-supporting film as a substrate and building a three-dimensional hierarchical structure on its surface. Polyaniline fiber composite electrode material approach to overcome performance limitations of polyaniline in electrode materials

Method used

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  • A self-supporting graphene film/polyaniline@polyaniline hierarchical structure composite electrode, preparation method and application
  • A self-supporting graphene film/polyaniline@polyaniline hierarchical structure composite electrode, preparation method and application
  • A self-supporting graphene film/polyaniline@polyaniline hierarchical structure composite electrode, preparation method and application

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Embodiment 1

[0028] Immerse the cut graphene film in 40ml of 0.1M camphorsulfonic acid solution, then add 0.6mmol of aniline monomer, stir well, then add 20mL of 0.1M sodium persulfate solution to initiate the polymerization of aniline monomer, and react for 6 hours at room temperature Take out the sample, rinse it with a large amount of deionized water and ethanol, and then dry it overnight in a vacuum oven to obtain sample 1, which is marked as graphene / polyaniline;

Embodiment 2

[0030] The sulfuric acid of configuration 0.1M and the aniline solution of 0.1M, wherein the ratio of water and ethanol is 1:1, the sample 1 (graphene film / polyaniline) gained in the above-mentioned embodiment 1 is immersed in this electrolytic solution, at 0.8V Constant voltage electrodeposition under voltage for 10 min, followed by washing with deionized water and drying to obtain sample 2, marked as graphene / polyaniline@polyaniline.

[0031] The morphology of the above graphene / polyaniline and graphene / polyaniline@polyaniline composite electrode materials was characterized by a field emission scanning electron microscope (JSM-4800);

[0032] The composite electrode materials in Example 1 and Example 2 are directly used as the working electrode after drying, and the solution of sodium sulfate of 1M is configured as the electrolyte at the same time, the platinum sheet is used as the counter electrode, and the Ag / AgCl electrode is used as the reference electrode to form three e...

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Abstract

The invention discloses the manufacturing method of the flexible composite electrode material of self-supporting graphene / polyaniline@polyaniline. The method comprises the following steps of firstly,forming a self-supporting flexible carrier by graphene oxide through vacuum filtration; then, through an in situ polymerization method, synthesizing polyaniline nanofibers on a surface; and finally, in a electrolyte containing aniline monomers, through constant-potential chemical deposition, growing 40-50 nm polyaniline nanowhiskers on polyaniline fibers, and acquiring a hierarchical composite structure based on a graphene film. By using the manufacturing method, the conductivity of a polyaniline nanofiber network is effectively increased, simultaneously, the wettability of a flexible composite electrode to the electrolyte is improved, and the composite material presents good electrochemical performance and has a good application prospect in the field of supercapacitor materials.

Description

technical field [0001] The invention belongs to the field of new energy materials, and mainly relates to the preparation of a self-supporting graphene film / polyaniline@polyaniline hierarchical structure composite electrode, which can be used as an electrode material for a supercapacitor. Background technique [0002] As a new type of energy storage device, flexible supercapacitor has the advantages of high volume power density, portability, cheapness, safety, etc., and has very important application value in the field of wearable electronic devices in the future. However, the energy density of flexible capacitors is still low, which seriously restricts its commercial application. Therefore, the development of flexible electrode materials with high specific capacity is the difficulty of current research. This requires the design of a more reasonable composite electrode structure to break through the original electrochemical performance of the electrode material, so that whil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/48H01G11/86
CPCH01G11/32H01G11/48H01G11/86Y02E60/13
Inventor 程起林徐田李怀龙何颖
Owner EAST CHINA UNIV OF SCI & TECH
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