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Method for producing asymmetric fiber supercapacitor electrode, produced electrode and supercapacitor

A supercapacitor and asymmetric technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of high cost of asymmetric fiber supercapacitor electrodes, unsatisfactory electrochemical performance, and complicated preparation process. Achieve excellent electrochemical performance, wide operating voltage window, simple preparation process and equipment

Active Publication Date: 2021-01-15
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a single hydrophilic carbon fiber as the base to prepare asymmetric fiber based on the problems of high cost, complex preparation process, low safety and unsatisfactory electrochemical performance of the current asymmetric fiber supercapacitor electrode. Supercapacitor electrodes and methods for supercapacitors

Method used

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  • Method for producing asymmetric fiber supercapacitor electrode, produced electrode and supercapacitor
  • Method for producing asymmetric fiber supercapacitor electrode, produced electrode and supercapacitor
  • Method for producing asymmetric fiber supercapacitor electrode, produced electrode and supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Embodiment 1 A kind of method that takes carbon fiber as substrate to prepare asymmetric fiber supercapacitor electrode in situ

[0051] figure 1 In order to prepare tricobalt tetroxide / carbon fiber array (Co 3 o 4 / CF) and porous carbon fiber (PCF).

[0052] S1. Sonicate the carbon fibers in 3M hydrochloric acid solution for 30 minutes, and then alternately wash them in water and ethanol;

[0053] S2. 1.1896g cobalt chloride hexahydrate and 1.5g urea were stirred in 20mL water to obtain a solution;

[0054] S3. Transfer the solution and carbon fiber prepared in step S2 to a polytetrafluoroethylene-lined stainless steel autoclave, seal and keep it at 90°C for 10h, then cool to room temperature, take it out, wash and dry at room temperature, and obtain carbon fiber grown on the carbon fiber Basic cobalt carbonate nanoarrays (CoCH / CF);

[0055] S4. Immerse the CoCH / CF prepared in step S3 into 0.125g mL -1 In the 2-methylimidazole aqueous solution of 5h, due to the f...

Embodiment 2

[0058] The characterization of embodiment 2 single electrode

[0059] 1. Experimental method

[0060] The S-4800 scanning electron microscope was used for SEM morphology characterization of the sample prepared in Example 1. The electrochemical performance test was carried out on Shanghai Chenhua CHI760E electrochemical workstation, wherein the platinum wire electrode was used as the counter electrode, the Ag / AgCl electrode was used as the reference electrode, and the sample Co prepared in Example 1 was 3 o 4 / CF and PCF were used as working electrodes, and 6M KOH solution was used as electrolyte.

[0061] 2. Experimental results

[0062] (1) figure 2 The A-C picture is the SEM picture of CoCH / CF. From the picture, it can be seen that CoCH grows neatly on the carbon fiber; figure 2 The D-F picture is the SEM picture of ZIF-67 / CoCH / CF, and it can be seen from the picture that ZIF-67 is coated on CoCH; figure 2 The G-I diagram is cobalt tetroxide / carbon fiber array elect...

Embodiment 3

[0064] Embodiment 3 Asymmetric Fiber Supercapacitor

[0065] 1. Preparation method

[0066] The tricobalt tetroxide / carbon fiber array (Co 3 o 4 / CF) and porous carbon fiber (PCF) to prepare an asymmetric fiber supercapacitor (ASC), specifically through the following methods:

[0067] The fiber positive electrode (Co 3 o 4 / CF) and the fiber negative electrode (PCF) were wrapped with a layer of separator (CNF gel), and dried at room temperature; then soaked in 6M KOH electrolyte to swell; finally, the two fiber positive and negative electrodes were wound together and packaged in in a plastic bag with platinum wire as the lead.

[0068] 2. Electrochemical performance test of supercapacitor

[0069] (1) Figure 7 For the electrochemical performance test of asymmetric fiber supercapacitor (ASC), where Figure 7 Figure A is the cyclic voltammetry curves of the asymmetric fiber supercapacitor (ASC) at different scan rates, showing a good charge and discharge process; Figu...

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Abstract

The invention provides a method for producing an asymmetric fiber supercapacitor electrode, the produced electrode and a supercapacitor. A single hydrophilic carbon fiber (CF) serves as a substrate, aCo3O4 array grows on a surface, a Co3O4 / CF array is obtained, the Co3O4 / CF array is rich in specific surface area, convenient to make contact with an electrolyte in a testing process and beneficial to rapid reaction, and a good channel is provided for ion conduction so that the electrochemical performance of the asymmetric fiber supercapacitor is improved; in addition, rich porous structures aremanufactured on the surface of a single hydrophilic CF, and the obtained porous carbon fiber (PCF) also has the rich specific surface area; the Co3O4 / CF electrode and the PCF electrode have good stability and an excellent specific capacitance; and the Co3O4 / CF and the PCF are used as the positive electrode and the negative electrode of the asymmetric fiber supercapacitor, extra binder is not used,and the obtained asymmetric fiber supercapacitor (ASC) has a wide working voltage window and excellent energy density and power density.

Description

technical field [0001] The invention belongs to the technical field of asymmetric fiber supercapacitors, and in particular relates to a method for preparing an electrode of an asymmetric fiber supercapacitor and the prepared electrode and supercapacitor. Background technique [0002] Supercapacitors have attracted widespread attention in many power fields due to their unique properties and great development potential (J.Am.Chem.Soc.2018, 140, 10941-10945). According to the energy storage mechanism, supercapacitors are generally divided into electric double layer supercapacitors and pseudocapacitive supercapacitors. EDLCs are usually composed of porous carbon materials that can physically accumulate a large amount of charge at the electrode / electrolyte-rich interface, a property that enables EDLCs to be rapidly charged and discharged with excellent cycling stability. However, the specific capacitance of electric double layer supercapacitors is relatively low, so the energy d...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/40H01G11/46H01G11/24H01G11/26
CPCH01G11/86H01G11/40H01G11/46H01G11/24H01G11/26Y02E60/13
Inventor 祝方明谢秀丽朱宇琼邹宝康
Owner SUN YAT SEN UNIV
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