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Preparation method for ternary composites of graphene/manganese dioxide nanosheet /polyaniline nanorod

A technology of manganese dioxide and composite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of limited practical application, low specific energy density, poor cycle stability, etc., and achieve material Effects of low cost, excellent rate characteristics, and high specific capacitance

Inactive Publication Date: 2015-03-11
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Carbon materials use the interface electric double layer formed between the electrode and the electrolyte to achieve energy storage. This energy storage is achieved through the electrochemical polarization of the electrolyte solution, and no electrochemical reaction occurs, so it has a good cycle Stability and high specific power density, and graphene has a unique two-dimensional sheet structure, which has better conductivity than other carbon materials, so it can be used as an electrode material for supercapacitors, but due to the low specific energy density limits its application in practice
Manganese oxide has a wide range of resources, low price, and is environmentally friendly. It has a variety of oxidation valence states, and can store charges through valence transitions, so it has a high specific capacitance, but its low conductivity limits its practical application.
Conductive polymers use redox reactions to store energy by transforming doped and dedoped states. Therefore, conductive polymers have high-density charges not only at the interface but also in the entire volume, and have high specific energy. Density, but poor cycling stability due to redox reactions in the energy storage process, which also hinders its practical application

Method used

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  • Preparation method for ternary composites of graphene/manganese dioxide nanosheet /polyaniline nanorod
  • Preparation method for ternary composites of graphene/manganese dioxide nanosheet /polyaniline nanorod
  • Preparation method for ternary composites of graphene/manganese dioxide nanosheet /polyaniline nanorod

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Experimental program
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Effect test

Embodiment 1

[0028] Mix the prepared 0.1M manganese acetate tetrahydrate solution and 0.1M sodium sulfate solution at a volume ratio of 1:1, then immerse the self-made graphene paper in the mixed solution, and use Autolab to electrochemically work at a constant temperature of 0.8V. Electrodeposition was carried out for 300s under high pressure conditions, then cleaned with deionized water, and dried in vacuum for 6h.

Embodiment 2

[0030]Measure 1.2ml of aniline monomer (distilled under reduced pressure before use) into 75ml of deionized water, stir for 1min, weigh 3.4g of ammonium persulfate solid, add 37.5ml of deionized water, stir for 1min, and then mix the above two solutions Together, stirred for 1 min, the graphene / manganese dioxide binary composite material prepared in Example 1 was immersed in the mixed solution, and polymerized for 3 h under static conditions.

Embodiment 3

[0032] As the control group of Example 2, measure 1.2ml of aniline monomer (distilled under reduced pressure before use) into 75ml of deionized water, stir for 1min, weigh 3.4g of ammonium persulfate solid and add 37.5ml of deionized water, stir for 1min , and then the above two solutions were mixed together, stirred for 1 min, the pure graphene paper was immersed in the mixed solution, and polymerized under the same static condition for 3 h.

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Abstract

The invention provides a preparation method for ternary composites of graphene / manganese dioxide nanosheet / polyaniline nanorod. The preparation method includes: drawing graphene oxide suspension liquid into graphene oxide papers using vacuum suction filter, and obtaining the graphene oxide papers under the reducing action of hydroiodic acid; obtaining manganese dioxide nanosheets on the graphene paper surface by a constant voltage deposition method; embedding the polyaniline nanorods between the manganese dioxide nanosheets by an in situ polymerization method to improve the electrical conductivity of the composite materials. The preparation method is simple and is easy to operate, and the material cost is low; in addition, the material has high specific capacitance and excellent electrochemical stability and excellent rate capability. Moreover, the final product is the self-support flexible material, and the graphene paper can act as a current collector and electrode material, and can also be assembled into the flexible components, and has the very good application prospect.

Description

technical field [0001] The invention belongs to the field of new energy materials, and relates to a preparation method of a supercapacitor electrode material, in particular to the preparation of a graphene / manganese dioxide nanosheet / polyaniline nanorod ternary composite material. Background technique [0002] With the development of social economy, people pay more and more attention to green energy and ecological environment. As a new type of energy storage device, supercapacitors have the characteristics of high power density, long cycle life and wide operating temperature range. Mobile energy systems, backup power systems and other aspects have extremely important application value. Especially with the rise of environmentally friendly electric vehicles and electronic products, high-power and flexible supercapacitors have shown unprecedented application prospects. Therefore, supercapacitors are being developed and produced by more and more countries and enterprises. Ele...

Claims

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Application Information

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IPC IPC(8): H01G11/48H01G11/46H01G11/36B82Y30/00B82Y40/00
CPCY02E60/13H01G11/48B82Y30/00B82Y40/00H01G11/36H01G11/46
Inventor 程起林李怀龙李春忠杜双双赵洁
Owner EAST CHINA UNIV OF SCI & TECH
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