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Preparation methods of different carbon fiber/cobalt hydroxide electrodes and solid-liquid composite electrode systems

A technology of cobalt hydroxide and composite electrodes, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of low energy density, achieve high solubility, good safety, and easy charge transfer

Inactive Publication Date: 2016-05-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, relative to batteries, its energy density is still low, which will largely limit its use

Method used

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  • Preparation methods of different carbon fiber/cobalt hydroxide electrodes and solid-liquid composite electrode systems
  • Preparation methods of different carbon fiber/cobalt hydroxide electrodes and solid-liquid composite electrode systems
  • Preparation methods of different carbon fiber/cobalt hydroxide electrodes and solid-liquid composite electrode systems

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Effect test

preparation example Construction

[0062] C: the preparation of cobalt hydroxide in the present invention adopts constant potential or constant current electrochemical deposition technology to grow cobalt hydroxide on the treated carbon fiber material substrate, and the main steps are as follows:

[0063] 1) The temperature of the constant temperature water bath is raised to a predetermined temperature to maintain a constant temperature of the electrochemical deposition system.

[0064] 2) Adjust the required deposition potential or current, and conduct electrodeposition according to the predetermined deposition amount; after the electrodeposition is completed, turn off the power, take out the working electrode, wash it with deionized water several times, and dry it in an oven to obtain carbon fiber Materials / Cobalt Hydroxide Solid Electrode. The above-mentioned different carbon fiber materials / cobalt hydroxide solid electrodes were weighed with a micro balance.

[0065] D: Prepare a certain concentration of K...

Embodiment 1

[0075] 1) Cut a 2mm thick carbon felt into a rectangle with an area of ​​1cmx2cm.

[0076] 2) Soak the rectangular sample in a beaker filled with acetone solution, let it stand for 2 hours, and sonicate it in the solution for 10 minutes; wash the sample with ethanol solution, soak it in a beaker filled with ethanol solution, and let it stand for 2 After 1 hour, ultrasonic in the solution for 10 min; rinse the sample with deionized water, soak it in a beaker filled with deionized water, let it stand for 2 hours, and ultrasonic in the solution for 10 min. After repeated rinsing with deionized water, dry in an oven at 60°C for 18 hours. After cooling down, the mass of the sample was weighed with a microbalance.

[0077] 3) The voltage of the potentiostat was adjusted to -0.9V, and the electrodeposition was carried out by the cathodic deposition method. Electrodeposition adopts a three-electrode system, the above-mentioned treated carbon felt is the working electrode, the counte...

Embodiment 2

[0081] In Step 1) of Example 1, the carbon felt is replaced by carbon cloth, and the remaining steps are the same as in Example 1. After electrochemical testing, when the current density is 2A / g, the specific capacitance can reach 1055F / g.

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Abstract

The invention relates to a preparation method for different carbon fibers / a cobalt hydroxide electrode and a solid-liquid composite electrode system. By means of pretreatment and modification of different carbon fibers, the carbon fibers serve as a substrate, composite of metal oxide or hydroxide and the carbon fibers are realized by the electrochemical deposition, and a solid electrode is obtained and has high specific capacitance in the alkaline aqueous solution. Redox substances are added into the alkaline aqueous solution, a composite electrode system that the solid electrode and liquid-phase electrolyte supply the pseudocapacitance jointly is obtained. The composite electrode system has ultra-high specific capacitance, is applied in supercapacitors, and has the advantages of ultra-high energy density, high power density and long service life. The specific capacitance of the composite electrode system can be adjusted by changing the concentration and volume of the redox substances, and the energy density and power density of the supercapacitors can be further changed to meet different using requirements.

Description

technical field [0001] The invention relates to a composite electrode system of different carbon fiber materials / cobalt hydroxide electrodes and solid-liquid two-phase pseudocapacitance. Electrochemical deposition method was used to prepare different carbon fiber materials / cobalt hydroxide solid electrodes, which were used in KOH electrolyte. On the basis of the above, different redox substances are added to the KOH solution, and the pseudocapacitance produced by different redox substances can be superimposed and synergistic with the solid electrode pseudocapacitance in this system, thereby obtaining an unprecedented ultrahigh specific capacitance. It specifically involves the pretreatment and modification of different carbon fiber materials, and based on this, the metal oxide or hydroxide is combined with the carbon fiber material substrate by electrochemical deposition. In the KOH electrolyte, by changing the redox substance The concentration and volume of the supercapacito...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/40H01G11/86
CPCY02E60/13
Inventor 郑伟涛王浩翔张恒彬王欣赵翠梅
Owner JILIN UNIV
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