CN111933456A - MnO (MnO)2Preparation method of/carbon fiber composite electrode and capacitor with same - Google Patents
MnO (MnO)2Preparation method of/carbon fiber composite electrode and capacitor with same Download PDFInfo
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- CN111933456A CN111933456A CN202010799415.5A CN202010799415A CN111933456A CN 111933456 A CN111933456 A CN 111933456A CN 202010799415 A CN202010799415 A CN 202010799415A CN 111933456 A CN111933456 A CN 111933456A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/24—Electrodes characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/40—Fibres
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/46—Metal oxides
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Abstract
The invention discloses MnO2A preparation method of a carbon fiber composite electrode and a capacitor with the same relate to the technical field of nano composite material preparation, surface oxidation treatment is carried out on the surface of carbon fiber, and the functional layer on the surface is effectively prevented from being stripped and falling off from the surface of the carbon fiber in the electrochemical test process or under the action of external force; meanwhile, hydrazine hydrate reduction treatment is carried out on the oxidized carbon fiber, partial oxygen-containing groups on the surface of the carbon fiber are reduced, the conductivity of the carbon fiber material is greatly improved, and MnO is greatly improved2Composite carbon fiber electrodeSpecific capacitance of the electrode system.
Description
Technical Field
The invention relates to the technical field of nano composite material preparation, in particular to a preparation method of a MnO 2/carbon fiber composite electrode and a capacitor with the same.
Background
With the rapid development of science and technology, the research on flexible wearable devices becomes a hot spot. The wearable device is usually small in size, the space for placing the energy storage device is limited, and research and preparation of the energy storage device matched with the wearable device becomes an important part in the development link of the flexible wearable device. The super capacitor has the advantages of fast charge and discharge and high power density, and the energy density of the super capacitor is between that of a traditional capacitor and that of a secondary battery. The one-dimensional super capacitor has the advantages of small volume and easiness in processing, and the space in the electronic equipment can be fully utilized when the one-dimensional super capacitor with high power density and high energy density is prepared.
The key to making supercapacitors with high power density and energy density is to make electrodes with high power density and high energy density. The carbon material has excellent electrical conductivity, but its energy storage mechanism is based on an electric double layer, so its specific capacitance is relatively small. The pseudocapacitance material has high specific capacitance because the pseudocapacitance material can achieve the purpose of storing charges through reversible Faraday reaction, but the application of the pseudocapacitance material is limited by the conductivity of the pseudocapacitance material. In order to combine the advantages of the two, the two are combined to prepare a composite electrode based on a carbon material and a pseudocapacitance material. The carbon material plays a role of a conductor and can rapidly transfer electrons, so that the pseudocapacitance material can perform rapid oxidation-reduction reaction.
The electrode composite electrode based on the carbon fiber is mostly prepared by adopting a core-shell structure or adding a functional layer on the surface of the carbon fiber. In the method of adding the functional layer on the surface of the carbon fiber, the outer layer (the surface functional layer) is easily peeled off from the surface of the carbon fiber due to the reasons of low bonding force between the surface functional layer and the carbon fiber, lack of strong intermolecular force, or change of the volume of the electrode material in the charging and discharging processes, so that the performance of the carbon fiber composite electrode is affected.
Disclosure of Invention
The invention aims to overcome the technical defect that a functional layer on the surface of a carbon fiber composite electrode is easy to fall off in the prior art, provides a preparation method of a MnO 2/carbon fiber composite electrode and a capacitor with the same, and greatly improves the structural stability of the carbon fiber composite electrode.
In one aspect of the invention, a preparation method of a MnO 2/carbon fiber composite electrode is provided, which comprises the following steps:
oxidizing the surface of carbon fiber, namely putting the carbon fiber into a container, performing acid treatment in an ice-water bath, adding a first oxidizing agent for performing primary oxidation treatment, adding water for diluting, adding a second oxidizing agent for performing secondary oxidation treatment, cleaning, drying and sealing to obtain oxidized carbon fiber CF-1 for later use;
MnO2carbon fiber composite electricityPreparing an electrode, namely taking the treated carbon fiber as a working electrode, taking a saturated calomel electrode as a reference electrode, taking a platinum screen as a counter electrode, and taking an electrodeposition solution containing 0.05-0.2M MnAc2And 0.01-0.05M NH4Ac solution, MnO obtained by constant current deposition2The carbon fiber composite electrode has an electrodeposition current of 0.1-1 mA and an electrodeposition time of 100 s mg-1 -500 s mg-1。
Further, after the surface oxidation treatment of the carbon fiber, the carbon fiber microwave modification treatment is also included, the carbon fiber microwave modification is carried out, CF-1 is treated in a microwave environment for 1-10min, and the carbon fiber CF-2 after the microwave modification treatment is obtained.
Further, after the carbon fiber is subjected to microwave modification treatment, hydrazine hydrate reduction treatment is also included, CF-2 is placed in a hydrothermal reaction kettle, hydrazine hydrate is added for reduction treatment, cleaning and drying are carried out, and then sealing is carried out, so that carbon fiber CF-3 subjected to hydrazine hydrate reduction treatment is obtained.
Preferably, the acid treatment is a mixed acid treatment.
Further, the mixed acid is concentrated sulfuric acid and concentrated nitric acid, preferably concentrated sulfuric acid with the mass fraction of 95-98% and concentrated nitric acid with the mass fraction of 65-68%.
Preferably, the strength of the carbon fiber is not lower than 4000Mpa, the first oxidant is potassium permanganate, and the second oxidant is hydrogen peroxide.
Preferably, the electrodeposition solution contains 0.1M MnAc2And 0.02M NH4Ac, and the electrodeposition current is 0.5 mA.
Preferably, the microwave treatment time is 6 min.
In another aspect of the invention, the invention provides a super capacitor, MnO prepared by the preparation method2The carbon fiber electrode is used as an electrode of the super capacitor.
In another aspect, the present invention provides a method for manufacturing a super capacitor, which is characterized by comprising the following steps: preparing electrolyte, MnO, from PVP and sodium sulfate2Carbon fiber electrodes inserted into electrolyte in MnO2Formation of condensate on the surface of carbon fiber electrodeGlue coating, MnO coating two beams with gel2The carbon fiber electrodes are assembled in parallel, and the PVA film is wrapped and sealed to obtain the super capacitor
Compared with the prior art, the invention has the positive improvement effects that: .
(1) The surface oxidation treatment is carried out on the surface of the carbon fiber, so that the functional layer on the surface is effectively prevented from being stripped and falling off from the surface of the carbon fiber in the electrochemical test process or under the action of external force;
(2) the microwave treatment increases the pores among the carbon fibers, and improves the utilization rate of the oxidized carbon fibers;
(3) hydrazine hydrate reduction treatment, namely reducing partial oxygen-containing groups on the surface of the carbon fiber, so that the conductivity of the carbon fiber material is greatly improved, and the specific capacitance of the carbon fiber is greatly improved;
(4) the good capacitance energy storage performance of the pseudocapacitance material and the good conductivity of the one-dimensional flexible carbon fiber are combined together to form the one-dimensional flexible solid-state supercapacitor, so that the capacitance and the energy density of the carbon fiber supercapacitor are greatly increased.
MnO to be prepared2The/carbon fiber composite electrode is used as a two-electrode system test electrode material and PVA/Na2SO4The gel is used as an electrolyte to prepare a one-dimensional flexible solid-state supercapacitor, and the electrochemical performance of the one-dimensional flexible solid-state supercapacitor in practical application is tested.
Drawings
FIG. 1 shows MnO prepared in example 32A charge-discharge curve diagram of a solid-state supercapacitor assembled by the carbon fiber composite electrode under different bending angles;
FIG. 2 is an SEM image of the surface of oxidized carbon fibers at different microwave treatment times.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the embodiment of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of a portion of the invention and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1
Weighing 0.5 g of carbon fiber in a beaker, adding 20 mL of concentrated sulfuric acid and 10 mL of concentrated nitric acid, and placing in an ice-water bath to stir for not less than 1 h; then 3 g KMnO was added4Adjusting the temperature of the water bath to 35 ℃, continuously stirring for not less than 3h, and adding 100 mL of water; continuously stirring for at least 3H, and adding H under stirring2O2Until the solution is clear and transparent; after the temperature of the solution is reduced to room temperature, stopping stirring, washing with water for not less than 10 times (to remove residual solution on the surface of the carbon fiber), drying at 60 ℃ for not less than 12 hours, and sealing and storing to obtain oxidized carbon fiber CF-1;
spreading 0.1 g of carbon fiber CF-1 at the bottom of a polytetrafluoroethylene beaker, placing the polytetrafluoroethylene beaker in a microwave oven, and performing microwave treatment for 1 min at low power to obtain carbon fiber CF-2 subjected to microwave modification treatment;
putting 100 mg of carbon fiber CF-2 into a polytetrafluoroethylene hydrothermal reaction kettle, adding 0.5 mL of hydrazine hydrate, sealing the hydrothermal reaction kettle, and putting the hydrothermal reaction kettle into an oil bath at the temperature of 80 ℃ for reduction reaction for not less than 15 hours; after the reaction is finished, taking out the hydrothermal reaction kettle, cooling to room temperature, washing with water for not less than 5 times, and drying in an oven at 60 ℃ for not less than 12 hours to obtain carbon fiber CF-3 subjected to hydrazine hydrate reduction treatment;
taking a bundle of carbon fiber CF-3, immersing the carbon fiber CF-3 in concentrated sulfuric acid, treating for at least 2 hours at 80 ℃ (to remove impurities on the surface of the carbon fiber CF-3), washing with water, and drying for later use; taking the treated carbon fiber CF-3 as a working electrode, taking a saturated calomel electrode as a reference electrode, taking a platinum screen as a counter electrode, and taking an electrodeposition solution containing 0.1M MnAc2And 0.02M NH4A solution of Ac; using an electrodeposition current of 0.5mA for an electrodeposition time of 200 s mg-1(based on the mass of the carbon fibers); MnO formation by constant current deposition2Carbon fiber composite electrode。
4 g of PVP and 3 g of Na2SO4Mixing in 40 mL water, and vigorously stirring at 90 deg.C in water bath for 4 hr to obtain PVP/Na2SO4A gel electrolyte. Before assembly, respectively bending MnO with the bending angles of 0 degree, 90 degrees and 180 degrees2Soaking carbon fiber composite electrode into PVP/Na2SO4In the gel. Then respectively arranging two MnO bodies with the same bending angle2And the/carbon fiber composite electrode and the PVA film are wrapped in parallel to obtain the assembled solid-state supercapacitor.
Example 2
Weighing 0.5 g of carbon fiber in a beaker, adding 20 mL of concentrated sulfuric acid and 10 mL of concentrated nitric acid, and placing in an ice-water bath to stir for not less than 1 h; then 3 g KMnO was added4Adjusting the temperature of the water bath to 35 ℃, continuously stirring for not less than 3h, then adding 100 mL of water, and continuously stirring for not less than 3 h; adding H under stirring2O2Until the solution is clear and transparent; cooling the solution to room temperature, stopping stirring, washing with water for at least 10 times (to remove residual solution on the surface of the carbon fiber), and drying at 60 deg.C for at least 12 hr to obtain oxidized carbon fiber CF-1;
spreading 0.1 g of CF-1 at the bottom of a polytetrafluoroethylene beaker, placing the polytetrafluoroethylene beaker in a microwave oven, and performing microwave treatment for 10min at low power to obtain carbon fiber CF-2 subjected to microwave treatment;
putting 100 mg CF-2 into a polytetrafluoroethylene hydrothermal reaction kettle, adding 0.5 mL hydrazine hydrate, sealing the hydrothermal reaction kettle, and reacting in an oil bath at 80 ℃ for not less than 15 h; and (3) taking out the hydrothermal reaction kettle, cooling to room temperature, washing the carbon fiber with water for not less than 5 times, and drying in a drying oven at 60 ℃ for 12 hours to obtain the carbon fiber CF-3 subjected to hydrazine hydrate reduction treatment.
Immersing a bundle of carbon fiber CF-3 in concentrated sulfuric acid, placing for treatment at 80 ℃ for at least 2 h, washing with water, and drying for later use; taking the treated carbon fiber CF-3 as a working electrode, taking a saturated calomel electrode as a reference electrode, taking a platinum screen as a counter electrode, and taking an electrodeposition solution containing 0.1M MnAc2And 0.02M NH4A solution of Ac. Using an electrodeposition current of 0.5mA for an electrodeposition time of 400 s mg-1(carbon fiber-based substance)Amount) to obtain MnO2A carbon fiber composite electrode.
4 g of PVP and 3 g of Na2SO4Mixing in 40 mL water, and vigorously stirring at 90 deg.C in water bath for 4 hr to obtain PVP/Na2SO4A gel electrolyte. Before assembly, respectively bending MnO with the bending angles of 0 degree, 90 degrees and 180 degrees2Soaking carbon fiber composite electrode into PVP/Na2SO4In the gel. Then respectively arranging two MnO bodies with the same bending angle2And the/carbon fiber composite electrode and the PVA film are wrapped in parallel to obtain the assembled solid-state supercapacitor.
Example 3
Weighing 0.5 g of carbon fiber in a beaker, adding 20 mL of concentrated sulfuric acid and 10 mL of concentrated nitric acid, and stirring in an ice-water bath for not less than 1 h; then 3 g KMnO was added4Adjusting the temperature of the water bath to 35 ℃, continuously stirring for not less than 3h, adding 100 mL of water, and continuously stirring for not less than 3 h; adding H under stirring2O2When the solution is clear and transparent, stopping stirring when the solution is cooled to room temperature; washing the carbon fiber after oxidation treatment with water for not less than 10 times, and drying at 60 ℃ for not less than 12 hours to obtain carbon fiber CF-1 after oxidation treatment;
spreading 0.1 g of CF-1 at the bottom of a polytetrafluoroethylene beaker, placing the polytetrafluoroethylene beaker in a microwave oven, and performing microwave treatment for 6min at low power to obtain carbon fiber CF-2 subjected to microwave modification treatment;
putting 100 mg of carbon fiber CF-2 into a polytetrafluoroethylene hydrothermal reaction kettle, adding 0.5 mL of hydrazine hydrate, sealing the hydrothermal reaction kettle, and putting the hydrothermal reaction kettle in an oil bath at the temperature of 80 ℃ for reduction reaction for not less than 15 hours; and (3) taking out the hydrothermal reaction kettle, cooling to room temperature, washing the carbon fiber with water for not less than 5 times, and drying in a drying oven at 60 ℃ for not less than 12 hours to obtain the carbon fiber CF-3 subjected to hydrazine hydrate reduction treatment.
Immersing a bundle of carbon fiber CF-3 in concentrated sulfuric acid, placing for treatment at 80 ℃ for not less than 2 h, washing with water, and drying for later use; taking the treated carbon fiber CF-3 as a working electrode, taking a saturated calomel electrode as a reference electrode, taking a platinum screen as a counter electrode, and taking an electrodeposition solution containing 0.1M MnAc2And 0.02M NH4Ac solution, using 0.5mA electrodeposition current,the electrodeposition time was 500 s mg-1MnO obtained2A carbon fiber composite electrode.
4 g of PVP and 3 g of Na2SO4Mixing in 40 mL water, and vigorously stirring at 90 deg.C in water bath for 4 hr to obtain PVP/Na2SO4A gel electrolyte. Before assembly, respectively bending MnO with the bending angles of 0 degree, 90 degrees and 180 degrees2Soaking carbon fiber composite electrode into PVP/Na2SO4In the gel. Then respectively arranging two MnO bodies with the same bending angle2And the/carbon fiber composite electrode and the PVA film are wrapped in parallel to obtain the assembled solid-state supercapacitor.
MnO2Performance test of/carbon fiber composite electrode
MnO prepared in examples 1-32The carbon fiber composite electrode is connected with a platinum wire mesh electrode and a saturated calomel electrode to form a three-electrode system, and a constant current charge and discharge test is carried out by taking 1M sulfuric acid solution as electrolyte, and the result is shown in table 1.
As can be seen from the table, the nanosheet MnO of example 3 was prepared at a charge-discharge current density of 0.1A/g2The/carbon fiber composite electrode has the highest volume specific capacitance, but is based on MnO along with the increase of charge-discharge current density2The specific capacitance of the active material shows a tendency to decrease; MnO for longer electrodeposition time under the same charge-discharge current density2The higher the volume specific capacitance of the/carbon fiber composite electrode.
TABLE 1 constant current charging and discharging test results of MnO 2/carbon fiber composite electrode under different current densities
| Current density | Example 1 | Example 2 | Example 3 |
| 0.1A/g | 27.7F/cm3 | 57.2F/ cm3 | 58.7 F/ cm3 |
| 0.5A/g | 18.2F/ cm3 | 40.9 F/ cm3 | 42.1 F/ cm3 |
| 1A/g | 13.5/ cm3 | 32.1 F/ cm3 | 28.6 F/ cm3 |
The charge and discharge test of the solid-state supercapacitor assembled in example 3 showed that the charge and discharge current density was 0.1A g as shown in fig. 1-1In the process, under different bending angles (0 degrees, 90 degrees and 180 degrees), charge and discharge curves are almost overlapped to form a symmetrical triangle, which shows that the solid capacitor has good capacitance; the discharge time is substantially the same, which means that the capacitance in the bent state is substantially the same as that in the unbent state. The surface oxidation treatment is carried out on the surface of the carbon fiber, so that the surface functional layer can be effectively prevented from being stripped and falling off from the surface of the carbon fiber in the electrochemical test process.
MnO preparation of examples 1 to 32Scanning electron microscope images of the carbon fiber composite electrode are shown in FIG. 2, wherein (a) and (b) are MnO prepared in example 12SEM image of/carbon fiber composite electrode, (c) (d) MnO prepared in example 32SEM image of/carbon fiber composite electrode, (e) (f) MnO prepared in example 22SEM image of/carbon fiber composite electrode. As can be seen from the figure, MnO was added at 6min after the microwave treatment2The porosity of the/carbon fiber composite electrode surface is the largest.
The above embodiments are described in detail for the purpose of illustration, and it is not intended that the invention be limited thereto, but rather that the invention be construed as broadly as the invention will be apparent to those skilled in the art, and all equivalent variations and modifications which fall within the spirit and scope of the invention are therefore intended to be embraced therein.
Claims (10)
1. MnO (MnO)2Carbon fiber composite electricityThe preparation method of the pole is characterized by comprising the following steps:
oxidizing the surface of carbon fiber, namely putting the carbon fiber into a container, performing acid treatment in an ice-water bath, adding a first oxidizing agent for performing primary oxidation treatment, adding water for diluting, adding a second oxidizing agent for performing secondary oxidation treatment, cleaning, drying and sealing to obtain oxidized carbon fiber CF-1 for later use;
MnO2preparing a carbon fiber composite electrode, namely taking the treated carbon fiber as a working electrode, taking a saturated calomel electrode as a reference electrode, taking a platinum screen as a counter electrode, and taking an electrodeposition solution containing 0.05-0.2M MnAc2And 0.01-0.05M NH4Ac solution, MnO obtained by constant current deposition2The carbon fiber composite electrode has an electrodeposition current of 0.1-1 mA and an electrodeposition time of 100 s mg-1 -500 s mg-1。
Using MnO2The/carbon fiber composite electrode is used as a two-electrode system test electrode material and PVA/Na2SO4The gel is used as an electrolyte to prepare a one-dimensional flexible solid-state supercapacitor, and the electrochemical performance of the one-dimensional flexible solid-state supercapacitor in practical application is tested.
2. The preparation method of claim 1, wherein the carbon fiber surface oxidation treatment further comprises carbon fiber microwave modification treatment, wherein the carbon fiber microwave modification treatment comprises treating CF-1 in a microwave environment for 1-10min to obtain the carbon fiber CF-2 after the microwave modification treatment.
3. The preparation method according to claim 2, further comprising hydrazine hydrate reduction treatment after the carbon fiber microwave modification treatment, placing CF-2 in a hydrothermal reaction kettle, adding hydrazine hydrate for reduction treatment, cleaning, drying and sealing to obtain carbon fiber CF-3 after hydrazine hydrate reduction treatment.
4. The method according to claim 1, wherein the acid treatment is a mixed acid treatment.
5. The method according to claim 4, wherein the mixed acid is concentrated sulfuric acid and concentrated nitric acid, preferably concentrated sulfuric acid with a mass fraction of 95-98% and concentrated nitric acid with a mass fraction of 65-68%.
6. The method of claim 1, wherein the carbon fiber has a strength of not less than 4000Mpa, the first oxidizing agent is potassium permanganate, and the second oxidizing agent is hydrogen peroxide.
7. The method of claim 1, wherein the bath comprises 0.1M MnAc2And 0.02M NH4Ac, and the electrodeposition current is 0.5 mA.
8. The method of claim 2, wherein the microwave treatment time is 6 min.
9. A supercapacitor characterized by MnO prepared by the method of any one of claims 1 to 82The carbon fiber electrode is used as an electrode of the super capacitor.
10. The method for preparing the supercapacitor according to claim 9, comprising the steps of: preparing electrolyte, MnO, from PVP and sodium sulfate2Carbon fiber electrodes inserted into electrolyte in MnO2Forming gel coating on the surface of carbon fiber electrode, and coating two bundles of MnO coated with gel2And (3) assembling the carbon fiber electrodes in parallel, and wrapping and sealing the carbon fiber electrodes by using a PVA film to obtain the supercapacitor.
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