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MnO2-porous polyaniline composite electrode as well as preparation method and application thereof

A manganese dioxide and composite electrode technology, which is applied in the field of electrochemistry, can solve the problems of difficult and precise control of the content, and achieve the effects of high overall energy density, long cycle life and optimized overall performance

Active Publication Date: 2017-09-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, this method uses manganese dioxide to oxidize the aniline monomer, and the manganese dioxide will be dissolved and lost when the aniline is polymerized, making it difficult to accurately control the content of manganese dioxide and polyaniline in the composite material; The polyaniline covering layer is relatively dense. While improving the electronic conductivity of the electrode material, it also blocks the full contact between the manganese dioxide itself and the electrolyte, which also affects its capacitance performance from another level.

Method used

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  • MnO2-porous polyaniline composite electrode as well as preparation method and application thereof
  • MnO2-porous polyaniline composite electrode as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] first step

[0041] Formulated with MnSO 4 and sulfuric acid mixed aqueous solution, the concentration of manganese sulfate in the mixed solution is 0.5mol / L, and the concentration of sulfuric acid is 2mol / L. Cut the carbon paper into an area of ​​4×1cm 2 The carbon paper tape is used as a current collector, and the current collector is ultrasonically washed with 10% sulfuric acid aqueous solution and acetone in turn, and finally rinsed with water and dried. Use an area of ​​4×4cm 2 The titanium mesh electrode is the counter electrode, the above mixed solution is the electrodeposition solution, and the current collector after surface cleaning is the anode (the working area is 1×1cm 2 ), conduct constant current anodic oxidation electrodeposition, the temperature of the electrodeposition solution is 5°C, and the current density is 8mA / cm 2 , the electrodeposition time is 3 minutes. After the electrodeposition is completed, the obtained manganese dioxide / carbon compo...

Embodiment 2

[0046] The operation process is the same as in Example 1, except that the MnSO in the manganese sulfate solution 4 and H 2 SO 4 The concentrations are 0.1mol / L and 0.5mol / L respectively, and the electrodeposition current density in the first step is 5mA / cm 2 , the electrodeposition time is 10 minutes, the concentrations of sulfuric acid and aniline sulfate in the acidified aniline sulfate solution are 0.5mol / L and 0.01mol / L respectively, and the electrolyte temperature of the first step of electrodeposition and the second step of electropolymerization are both 10°C , the potential scanning rate in the second step of electropolymerization is 100mV / s, the number of scanning segments is 20, and the measured specific capacitance of the electrode active material is 401.8F / g.

Embodiment 3

[0048] The operation process is the same as in Example 1, except that the MnSO in the manganese sulfate solution 4 and H 2 SO 4 The concentrations are 0.2mol / L and 1mol / L respectively, and the electrodeposition current density in the first step is 10mA / cm 2 , the time is 2 minutes, the concentrations of sulfuric acid and aniline sulfate in the acidified aniline sulfate solution are 1mol / L and 0.02mol / L respectively, the electrolyte temperature of the first step of electrodeposition and the second step of electropolymerization are both 10°C, the second The potential scanning rate during electropolymerization is 50mV / s, and the number of scanning segments is 10. The measured specific capacitance of the electrode active material is 436.3F / g.

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Abstract

The invention discloses a MnO2-porous polyaniline composite electrode as well as a preparation method and an application thereof. The composite oxide electrode comprises a current collector as well as MnO2 and a polyaniline fiber covering layer which are attached to the current collector, and the electrode contains no adhesives. The preparation method of the MnO2 composite electrode comprises steps as follows: a MnO2 layer is formed on the current collector through electrochemical deposition; the current collector with the MnO2 deposition layer is put in an aniline sulfate solution, and the porous polyaniline fiber deposition layer is deposited on the outer side of the MnO2 layer through electrokinetic potential deposition, so that the MnO2 composite electrode is obtained. The MnO2 composite electrode can be used for preparing an electrochemical supercapacitor and has the advantages of high specific capacitance, simple preparation process and the like.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a manganese dioxide-porous polyaniline composite electrode and its preparation method and application. Background technique [0002] Supercapacitor is a new concept energy storage device between batteries and traditional electrostatic capacitors. Compared with traditional electrostatic capacitors such as aluminum electrolytic capacitors, supercapacitors have higher specific capacitance, and the energy density that can be stored is traditional electrostatic capacitors Compared with batteries, supercapacitors have greater power density, and have the characteristics of high charge and discharge efficiency and long cycle life. Due to the many advantages above, the development of supercapacitor technology has been widely valued by academia, industry and military departments, and it is gradually being used as a backup power supply for electronic instruments, rockets, missiles,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/46H01G11/48H01G11/86
CPCY02E60/13H01G11/30H01G11/46H01G11/48H01G11/86
Inventor 陈亚关杰豪甘辉孔令坤陈白珍石西昌
Owner CENT SOUTH UNIV
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