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Method for preparing oxidized graphene/conductive polypyrrole nano wire composite material

A pyrrole nano-composite material technology, used in cable/conductor manufacturing, circuits, capacitors, etc., can solve the problems of low specific capacitance of supercapacitor electrode materials, and improve the charge-discharge cycle stability and specific capacitance, high specific capacity and The effect of stability, simple and easy preparation method

Inactive Publication Date: 2012-11-28
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the current situation that the specific capacitance of the graphene supercapacitor electrode material prepared by the existing preparation method is low, and proposes a preparation method of a graphene oxide / conductive polypyrrole nanowire composite material, and its purpose is to overcome the conductive polypyrrole as a supercapacitor electrode Due to the defects of the material, a supercapacitor electrode material with high specific capacitance and stable cycle performance was prepared

Method used

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  • Method for preparing oxidized graphene/conductive polypyrrole nano wire composite material
  • Method for preparing oxidized graphene/conductive polypyrrole nano wire composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Disperse 6 mg of graphite oxide in 200 mL of deionized water by ultrasonic treatment, ultrasonic for 3 h, and centrifuge to obtain a stable graphene oxide suspension in the upper layer with a concentration of 0.03 mg / mL. Add 1.82g of CTAB to the suspension, and stir thoroughly to dissolve CTAB in the graphene oxide suspension; add 0.55mL of pyrrole to it, and stir for 2h at 0~4°C, so that pyrrole is fully adsorbed on the graphene oxide nanosheets . Dissolve 1.83g of APS and 1.73g of citric acid in 50mL of deionized water, then slowly add the solution to the above reaction system, pyrrole begins to oxidatively polymerize to form polypyrrole, and the reactants are kept stirring at 0~4°C 5h. The obtained product was washed several times with absolute ethanol and deionized water, suction filtered, and vacuum-dried at 60°C for 5 hours to obtain a graphene oxide / conductive polypyrrole nanowire composite material, and the mass ratio of graphene oxide to polypyrrole was 1:99. ...

Embodiment 2

[0022] Disperse 10 mg of graphite oxide in 200 mL of deionized water, ultrasonicate for 3 h, and centrifuge to obtain a stable upper layer of graphene oxide suspension with a concentration of 0.05 mg / mL. Then add 1.82g of CTAB to it, and stir thoroughly to dissolve CTAB in the graphene oxide suspension; add 0.55mL of pyrrole to it, and stir for 2h at 0~4°C, so that pyrrole is fully adsorbed on the graphene oxide nanosheets. Dissolve 1.73g of citric acid in 50mL of deionized water, then add 1.83g of APS to it, and stir to dissolve the APS; then slowly add the mixed solution to the above reaction system, pyrrole begins to oxidatively polymerize, and the reactant Stirring was continued at 0~4°C for 5h. The obtained product was washed several times with absolute ethanol and deionized water, filtered with suction, and vacuum-dried at 60°C for 5 hours to obtain a graphene oxide / conductive polypyrrole nanowire composite material. The mass ratio of graphene oxide to polypyrrole was 2:...

Embodiment 3

[0025] Disperse 28mg of graphite oxide in 200mL of deionized water by ultrasonic treatment, sonicate for 3h, and centrifuge to obtain a stable graphene oxide suspension in the upper layer with a concentration of 0.14mg / mL. Add 1.82g of CTAB to the suspension, and stir thoroughly to dissolve CTAB in the graphene oxide suspension; add 0.55mL of pyrrole to it, and stir for 2h at 0~4°C, so that pyrrole is fully adsorbed on the graphene oxide nanosheets . 1.83g of APS and 1.73g of citric acid were dissolved in 50mL of deionized water, and then the mixed solution was slowly added to the above reaction system, and the reactant was continuously stirred at 0~4°C for 5h. The obtained product was washed several times with absolute ethanol and deionized water, suction filtered, and vacuum-dried at 60° C. for 5 h to obtain a graphene oxide / conductive polypyrrole nanowire composite material. The mass ratio of graphene oxide to polypyrrole was 5:95.

[0026] The specific capacitance of the ...

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Abstract

The invention relates to a method for preparing an oxidized graphene / conductive polypyrrole nano wire composite material. The method comprises the following steps of: preparing oxidized graphene by using natural graphite according to a chemical oxidization method, uniformly dispersing the oxidized graphene into deionized water by adopting an ultrasonic method to obtain a stable oxidized graphene suspension; adding hexadecyl trimethyl ammonium bromide with the mole concentration being 0.025 to 0.038 mol / L into the oxidized graphene suspension, uniformly stirring and mixing, adding pyrrole into the suspension, and uniformly mixing and stirring; polymerizing pyrrole monomers on an oxidized graphene nano sheet in situ by taking the hexadecyl trimethyl ammonium bromide as a surface active agent and ammonium persulfate as an oxidant, and performing frequent washing, suction filtration and vacuum drying on a product to finally obtain the oxidized graphene / conductive polypyrrole nano wire composite material. According to the preparation method, the process is simple, and the cost is low; and the product is high in specific capacity and high stability. The method can be applied to fields such as lithium ion batteries, sensors, electronic devices and fuel batteries.

Description

technical field [0001] The invention relates to a preparation method of a graphene oxide / conductive polypyrrole nanowire composite material, which is suitable as an electrode material for a supercapacitor and belongs to the technical field of electrochemistry and material synthesis. Background technique [0002] With the increasingly severe situation of global oil resources and the environment, how to realize the efficient and clean utilization of energy has become a major issue that needs to be solved urgently. Supercapacitor is a new type of energy storage device between traditional capacitors and secondary batteries. It has higher power density and long cycle life. It has a wide range of applications in communications, information storage, electric vehicles, and military applications. application. Electrode material is a key factor affecting the performance and production cost of supercapacitors. Conductive polypyrrole stores high-density charges through fast and revers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01G9/058
Inventor 李靖谢华清
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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