Polyaniline/MnO2 compound modified three-dimensional graphene composite material, preparation method and application of composite material

A composite material and polyaniline technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of low energy density, unsatisfactory electrochemical cycle performance, and poor cycle stability of supercapacitors, and achieve suitable for large-scale production, high specific capacitance, The effect of low preparation cost

Inactive Publication Date: 2014-06-11
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific capacitance of a single-component carbon material used as a supercapacitor is not high, and the conductivity of a single-component metal oxide used as a supercapacitor is low, and the electrochemical cycle is not ideal. The single-component conductive polymer is used as a supercapacitor. Supercapacitors have low energy density and poor cycle stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Add 0.1mol / L MnSO 4 , 0.1mol / L aniline monomer is dissolved in a dilute sulfuric acid solution with a concentration of 0.2mol / L, three-dimensional graphene is used as a working electrode, a saturated calomel electrode is used as a reference electrode, and a platinum electrode is placed in the above solution as a counter electrode , using cyclic voltammetry for electrochemical deposition, the scanning potential range is -0.2-1.2V, the scanning rate is 50mV / s, scanning 20 cycles, polyaniline and MnO 2 Composite formation and deposition in 3D graphene yields polyaniline / MnO 2 Composite modified three-dimensional graphene composites.

[0018] 2) The constant current charge and discharge experiment was carried out on the above composite material. At a current density of 1A / g, the specific capacitance was measured to be 263F / g. After 1000 cycles, the specific capacitance retention rate was 91.4%.

Embodiment 2

[0020] 1) Add 0.2mol / L MnSO 4 , 0.2mol / L aniline monomer is dissolved in a dilute sulfuric acid solution with a concentration of 0.2mol / L, three-dimensional graphene is used as a working electrode, a saturated calomel electrode is used as a reference electrode, and a platinum electrode is placed in the above solution as a counter electrode , using cyclic voltammetry for electrochemical deposition, the scanning potential range is -0.2-1.2V, the scanning rate is 20mV / s, scanning 10 cycles, polyaniline and MnO 2 Composite formation and deposition in 3D graphene yields polyaniline / MnO 2 Composite modified three-dimensional graphene composites.

[0021] 2) The constant current charge and discharge experiment was carried out on the above composite material. Under the current density of 1A / g, the specific capacitance was measured to be 286F / g. After 1000 cycles, the specific capacitance retention rate was 92.1%.

Embodiment 3

[0023] 1) Add 0.1mol / L Mn(CH 3 COO) 2 , 0.05mol / L aniline monomer is dissolved in a dilute sulfuric acid solution with a concentration of 0.1mol / L, three-dimensional graphene is used as a working electrode, a saturated calomel electrode is used as a reference electrode, and a platinum electrode is placed in the above solution as a counter electrode , using cyclic voltammetry for electrochemical deposition, the scanning potential range is -0.2-1.2V, the scanning rate is 50mV / s, scanning 15 cycles, polyaniline and MnO 2 Composite formation and deposition in 3D graphene yields polyaniline / MnO 2 Composite modified three-dimensional graphene composites.

[0024] 2) The constant current charge and discharge experiment was carried out on the above composite material. Under the current density of 1A / g, the specific capacitance was measured to be 224F / g. After 1000 cycles, the specific capacitance retention rate was 90.8%.

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Abstract

The invention discloses a polyaniline/MnO2 compound modified three-dimensional graphene composite material, a preparation method and application of the composite material. The preparation method comprises the following steps: dissolving manganese salt and an aniline monomer into dilute sulphuric acid solution with the concentration being 0.1-0.5mol/L, adding three-dimensional graphene serving as a working electrode, a saturated calomel electrode serving as a reference electrode and a platinum electrode serving as a counter electrode into the solution, performing electrochemical deposition by utilizing cyclic voltammetry, forming a compound from the polyaniline and MnO2 and depositing the compound in the three-dimensional graphene so as to obtain the polyaniline/MnO2 compound modified three-dimensional graphene composite material. The invention has the obvious characteristics that (1) raw materials are cheap, the compounding process is simple and convenient, the preparation cost is low and large-scale production is facilitated; (2) the ratio of the components of the component material can be controlled by controlling the scanning parameters of cyclic voltammetry and the amount of reactants; (3) the composite material has high specific electric capacity and stable electrochemical performance.

Description

technical field [0001] The present invention relates to a kind of polyaniline / MnO 2 The composite modified three-dimensional graphene composite material and its preparation method and application belong to the field of preparation of composite materials and supercapacitor electrode materials. Background technique [0002] Supercapacitors, or electrochemical capacitors, are a new type of energy storage device between traditional capacitors and secondary batteries. Compared with traditional capacitors, electrochemical capacitors have higher specific capacity, and the specific energy that can be stored is 10-100 times that of traditional capacitors; compared with batteries, they have high specific power, high energy density, short charging time, and high discharge efficiency. High and long cycle life and other advantages. It has extremely important and broad application prospects in the fields of communication technology, electric vehicles and aerospace defense technology. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24
Inventor 李亮朱芬孙配雷汪洋张桥喻湘华吴艳光穆海梅
Owner WUHAN INSTITUTE OF TECHNOLOGY
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