CN113675002A - Supercapacitor based on cobalt-based material - Google Patents
Supercapacitor based on cobalt-based material Download PDFInfo
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- CN113675002A CN113675002A CN202110954648.2A CN202110954648A CN113675002A CN 113675002 A CN113675002 A CN 113675002A CN 202110954648 A CN202110954648 A CN 202110954648A CN 113675002 A CN113675002 A CN 113675002A
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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
- H01G11/84—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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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 relates to a supercapacitor based on a cobalt-based material, and belongs to the technical field of supercapacitors. The invention aims to provide a super capacitor based on a cobalt-based material with low cost. The super capacitor comprises electrolyte and an electrode material, wherein potassium ferricyanide is added into the electrolyte, and the electrode material is cobalt molybdate, cobalt vanadate, cobalt boride, cobalt hydroxide or cobalt oxide. The invention adopts electrolyte additive [ K3Fe(CN)6]The specific capacitance of the composite material is obviously improved by the mutual matching of the specific capacitance and the electrode material, and the conductivity of the electrode is improved. The preparation method of the super capacitor is simple, the raw materials are easy to obtain, the thermal stability is good, and the cycle performance is excellent.
Description
Technical Field
The invention relates to a supercapacitor based on a cobalt-based material, and belongs to the technical field of supercapacitors.
Background
The super capacitor is a common electrochemical energy storage system, has the advantages of high charging and discharging efficiency, wide working temperature range, long service life, environmental protection and the like, and is widely applied to various aspects of daily life of people, such as a brake system, a backup power supply and the like.
The super capacitor mainly comprises a positive electrode material, a negative electrode material, a current collector, a diaphragm and electrolyte. The electrode material is an important constituent element, and the quality of the electrochemical performance of the electrode material directly influences the overall performance of the supercapacitor. The choice of electrolyte also has a large impact on the performance of the supercapacitor. Because the super capacitor can be normally used only when the electrolyte can stably exist. At present, although the electrochemical performance of the super capacitor is greatly improved, the super capacitor is still not ideal in the aspect of practical application, and the electrochemical performance needs to be further improved.
The Chinese patent application No. 201310051022.6 discloses a preparation method of a graphene/cobalt hydroxide-potassium ferricyanide/potassium hydroxide super capacitor energy storage electrode system, which is characterized in that graphene is deposited on foamed nickel by a chemical vapor deposition method, cobalt hydroxide is grown on a graphene substrate by electrodeposition, and potassium ferricyanide is added into electrolyte, so that the electrical property of a super capacitor is improved. The method only has a certain lifting effect on a single cobalt hydroxide electrode, and needs vapor deposition and electrodeposition, the process is complex, graphene is needed to be used in raw materials to improve conductivity, the graphene is expensive, and the cost is high.
Disclosure of Invention
In view of the above defects, the technical problem to be solved by the invention is to provide a low-cost supercapacitor based on a cobalt-based material.
The supercapacitor based on the cobalt-based material comprises electrolyte and an electrode material, wherein potassium ferricyanide is added into the electrolyte, and the electrode material is cobalt molybdate, cobalt vanadate, cobalt boride, cobalt hydroxide or cobalt oxide.
In one embodiment of the present invention, the concentration of potassium ferricyanide in the electrolyte solution is 0.05mol/L or less.
In one embodiment of the present invention, the concentration of potassium ferricyanide in the electrolyte is 0.01 to 0.05 mol/L. In a specific embodiment, the concentration of potassium ferricyanide is 0.03 to 0.05 mol/L. In a specific embodiment, the concentration of potassium ferricyanide is 0.04 mol/L.
In one embodiment of the invention, the electrolyte is a mixed solution of potassium ferricyanide and potassium hydroxide, and the concentration of the potassium hydroxide is 1-3 mol/L.
In one embodiment of the invention, the concentration of potassium hydroxide is 2 mol/L.
In one embodiment of the invention, the electrode material is prepared by a hydrothermal method.
In one embodiment of the present invention, the electrode material is prepared by a preparation method comprising the following steps:
a. cleaning the foamed nickel;
b. weighing reactants for preparing the electrode material, mixing the reactants according to theoretical dosage, dissolving the reactants in water, adding foamed nickel, and reacting at 60-150 ℃ to obtain the electrode material.
In one embodiment of the present invention, in the step a, at least one of hydrochloric acid, acetone and deionized water is used for cleaning the foamed nickel.
In one embodiment of the invention, the electrode material is cobalt molybdate and the reactants are cobalt chloride and sodium molybdate. Cobalt molybdate CoMoO can be obtained by reacting cobalt chloride with sodium molybdate4。
In another embodiment of the present invention, the electrode material is cobalt vanadate and the reactants are cobalt chloride and sodium vanadate. Cobalt chloride and sodium vanadate react to obtain the cobalt vanadate.
In another embodiment of the present invention, the electrode material is cobalt boride and the reactants are cobalt chloride, sodium borohydride and sodium hydroxide. Cobalt chloride, sodium borohydride and sodium hydroxide are adopted for reaction, and cobalt boride can be obtained.
In another embodiment of the present invention, when the electrode material is cobalt hydroxide, the reactants are cobalt chloride, ammonium fluoride and urea. Cobalt chloride, ammonium fluoride and urea are adopted for reaction, and cobalt hydroxide can be obtained.
In another embodiment of the present invention, when the electrode material is cobalt oxide, the reactants are cobalt nitrate and urea. Cobalt nitrate and urea are adopted to obtain cobalt oxide.
In the embodiment of the present invention, the hydrothermal reaction is preferably carried out in an autoclave.
In some embodiments of the invention, the reaction time is 3 to 6 hours.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts electrolyte additive [ K3Fe(CN)6]The specific capacitance of the composite material is obviously improved by the mutual matching of the specific capacitance and the electrode material, and the conductivity of the electrode is improved. The preparation method of the super capacitor is simple, the raw materials are easy to obtain, the thermal stability is good, and the cycle performance is excellent.
Drawings
FIG. 1 shows the addition of different concentrations of K according to example 1 of the present invention3Fe(CN)6Cyclic voltammogram in 2M KOH electrolyte.
FIG. 2 shows the addition of different concentrations of K according to example 1 of the present invention3Fe(CN)6Charge/discharge curves in 2M KOH electrolyte.
FIG. 3 shows the addition of different concentrations of K according to example 2 of the present invention3Fe(CN)6Cyclic voltammogram in 2M KOH electrolyte.
FIG. 4 shows the addition of different concentrations of K according to example 2 of the present invention3Fe(CN)6Charge/discharge curves in 2M KOH electrolyte.
FIG. 5 shows the addition of different concentrations of K according to example 3 of the present invention3Fe(CN)6Cyclic voltammogram in 2M KOH electrolyte.
FIG. 6 shows that different concentrations of K are added in example 3 of the present invention3Fe(CN)6Charge/discharge curves in 2M KOH electrolyte.
FIG. 7 shows example 4 of the present invention with addition ofSame concentration K3Fe(CN)6Cyclic voltammogram in 2M KOH electrolyte.
FIG. 8 shows that different concentrations of K are added in example 4 of the present invention3Fe(CN)6Charge/discharge curves in 2M KOH electrolyte.
FIG. 9 shows that different concentrations of K are added in example 5 of the present invention3Fe(CN)6Cyclic voltammogram in 2M KOH electrolyte.
FIG. 10 shows that different concentrations of K are added in example 5 of the present invention3Fe(CN)6Charge/discharge curves in 2M KOH electrolyte.
Detailed Description
The supercapacitor based on the cobalt-based material comprises electrolyte and an electrode material, wherein potassium ferricyanide is added into the electrolyte, and the electrode material is cobalt molybdate, cobalt vanadate, cobalt boride, cobalt hydroxide or cobalt oxide.
The supercapacitor based on the cobalt-based material improves the performance of the electrode material and an electrolyte system. Adding potassium ferricyanide [ K ] to the electrolyte3Fe(CN)6]The potassium ferricyanide is matched with a specific electrode material, two electrochemical oxidation activity reduction reactions can respectively occur in the surface layer of the electrode material and an electrolyte, and the two electrochemical oxidation activity reduction reactions can be mutually matched at the interface of the electrode/the electrolyte, so that the whole reaction rate is increased, and the electrochemical performance of the super capacitor is improved.
According to the supercapacitor based on the cobalt-based material, the electrolyte is added with the potassium ferricyanide, the specific capacitance of the supercapacitor can be improved, and the conventional additive dosage in the field is suitable for the supercapacitor. In one embodiment of the present invention, the concentration of potassium ferricyanide in the electrolyte solution is 0.05mol/L or less.
In one embodiment of the present invention, the concentration of potassium ferricyanide in the electrolyte is 0.01 to 0.05 mol/L. In a specific embodiment, the concentration of potassium ferricyanide is 0.03 to 0.05 mol/L. In a specific embodiment, the concentration of potassium ferricyanide is 0.04 mol/L.
The potassium ferricyanide is used as an electrolyte additive, and the electrolyte can be the electrolyte commonly used in the field. In one embodiment of the present invention, the electrolyte is a mixed solution of potassium ferricyanide and potassium hydroxide.
The concentration of the potassium hydroxide can be the concentration which is conventional in the field, such as 1-3 mol/L. In one embodiment of the invention, the concentration of potassium hydroxide is 2 mol/L.
Besides the electrolyte, the electrode material is also an important constituent of the inventive supercapacitor. In one embodiment of the invention, the electrode material is prepared by a hydrothermal method.
In one embodiment of the present invention, the electrode material is prepared by a preparation method comprising the following steps:
a. cleaning the foamed nickel;
b. weighing reactants for preparing the electrode material, mixing the reactants according to theoretical dosage, dissolving the reactants in water, adding foamed nickel, and reacting at 60-150 ℃ to obtain the electrode material.
The electrode material prepared by the hydrothermal method has high growth quality on a foamed nickel substrate, does not contain redundant organic solvent, can reduce the weakening of the conductivity to the greatest extent, is uniformly covered by the material, and has good stability and conductivity and difficult falling, so that the specific capacitance of a capacitor is high.
Wherein, step a is to clean the foamed nickel, and the foamed nickel can be cleaned by adopting a method which is conventional in the field. In one embodiment of the invention, the nickel foam is cleaned with at least one of hydrochloric acid, acetone, deionized water.
And b, preparing the electrode material by a hydrothermal method. Wherein, different electrode materials can be prepared by using different reactants, the reactants can be reactants for generating the electrode materials by the conventional hydrothermal reaction in the field, and the dosage of the reactants is theoretical dosage, namely, the dosage of each raw material is calculated and weighed according to the stoichiometric ratio of each constituent element in the theoretical reaction equation.
In one embodiment of the invention, the electrode material is cobalt molybdate and the reactants are cobalt chloride and sodium molybdate. By reaction of cobalt chloride with sodium molybdate, canCobalt molybdate CoMoO is obtained4。
In another embodiment of the present invention, the electrode material is cobalt vanadate and the reactants are cobalt chloride and sodium vanadate. Cobalt chloride and sodium vanadate react to obtain the cobalt vanadate.
In another embodiment of the present invention, the electrode material is cobalt boride and the reactants are cobalt chloride, sodium borohydride and sodium hydroxide. Cobalt chloride, sodium borohydride and sodium hydroxide are adopted for reaction, and cobalt boride can be obtained.
In another embodiment of the present invention, when the electrode material is cobalt hydroxide, the reactants are cobalt chloride, ammonium fluoride and urea. Cobalt chloride, ammonium fluoride and urea are adopted for reaction, and cobalt hydroxide can be obtained.
In another embodiment of the present invention, when the electrode material is cobalt oxide, the reactants are cobalt nitrate and urea. Cobalt nitrate and urea are adopted to obtain cobalt oxide.
In the present invention, the cobalt chloride may contain crystal water, such as CoCl2·6H2And O. The cobalt nitrate may also contain crystal water, such as Co (NO)3)2·6H2O。
In order to reach the hydrothermal reaction temperature, in the embodiment of the present invention, the hydrothermal reaction is preferably performed in an autoclave.
The reaction time is conventional in the art, and in some embodiments of the present invention, the reaction time is 3 to 6 hours.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Example 1
1g of CoCl2·6H2O and 1.02g of Na2MoO4Dissolving in 50mL of deionized water, transferring the obtained uniform solution to a stainless steel high-pressure reaction kettle with a lining, putting a piece of clean foamed nickel into the reaction kettle, placing the reaction kettle in a drying oven at 120 ℃ for reaction for 4 hours to obtain cobalt molybdate CoMoO4An electrode material.
Adopting a standard three-electrode system, a Pt electrode as a counter electrode, a saturated calomel electrode as a reference electrode, and cobalt molybdate CoMoO4The electrode material is a working electrode, and K of 0.01mol/L, 0.02mol/L, 0.03mol/L, 0.04mol/L and 0.05mol/L is respectively added into 2mol/L KOH electrolyte3Fe(CN)6Cyclic voltammogram (potential window of-0.2V to 0.6V, scan rate of 20mV s)-1) And constant current charge and discharge curve (current density of 1A g)-1) The results are shown in FIGS. 1 and 2.
As can be seen from FIG. 2, 0.04mol/L K was added3Fe(CN)6The specific capacitance of the capacitor is the highest and can reach 1778F g-1Is less than without K3Fe(CN)6Specific capacitance (223F g)-1) Increased by 697%, and added K3Fe(CN)6The specific capacitance of the capacitor system is improved. Wherein 0.01mol/L K is added3Fe(CN)6Has a specific capacitance of 396F g-1And 0.02mol/L K is added3Fe(CN)6Specific capacitance of 644F g-1Adding 0.03mol/L K3Fe(CN)6Specific capacitance of 688F g-1Adding 0.05mol/L K3Fe(CN)6Specific capacitance of 1311F g-1。
Example 2
1.05mmol of CoCl2·6H2O and 0.7mmol of Na3V4O8Dissolving in 50mL of deionized water, transferring the obtained uniform solution to a stainless steel high-pressure reaction kettle with a lining, putting a piece of clean foamed nickel into the reaction kettle, placing the reaction kettle in an oven at 130 ℃ for reaction for 3 hours to obtain cobalt vanadate Co3V2O8An electrode material.
Adopting a standard three-electrode system, a Pt electrode as a counter electrode, a saturated calomel electrode as a reference electrode, and cobalt vanadate Co3V2O8The electrode material is a working electrode, and K of 0.01mol/L, 0.02mol/L, 0.03mol/L, 0.04mol/L and 0.05mol/L is respectively added into 2mol/L KOH electrolyte3Fe(CN)6Cyclic voltammogram (potential window of-0.2V to 0.6V, scan rate of 20mV s)-1) And constant current charge and discharge curve (current density of 1A g)-1) The results are shown in FIGS. 3 and 4.
As can be seen from FIG. 4, 0.04mol/L K was added3Fe(CN)6The specific capacitance is the highest and can reach 837.5F g-1Is less than without K3Fe(CN)6Specific capacitance (87.5F g)-1) Increased by 857.1%, and the rest added with K3Fe(CN)6The specific capacitance of the capacitor system is improved. Wherein 0.01mol/L K is added3Fe(CN)6Has a specific capacitance of 203F g-1And 0.02mol/L K is added3Fe(CN)6Has a specific capacitance of 287.5F g-1Adding 0.03mol/L K3Fe(CN)6Specific capacitance of 382.5F g-1Adding 0.05mol/L K3Fe(CN)6Specific capacitance of 587.5F g-1。
Example 3
1g of CoCl2·6H2O was dissolved in 20mL of deionized water, placed on a magnetic stirrer and stirred for 30 minutes to form a homogeneous solution. 0.3g of NaBH4And 0.06g of NaOH was dissolved in 20mL of deionized water, and then added dropwise to the above mixed solution, and a piece of clean nickel foam was put therein, followed by continuous stirring for 3 hours, to obtain a cobalt boride CoB electrode material.
Adopting a standard three-electrode system, taking a Pt electrode as a counter electrode, taking a saturated calomel electrode as a reference electrode, taking a cobalt boride CoB electrode material as a working electrode, and respectively testing and adding K of 0.01mol/L, 0.02mol/L, 0.03mol/L, 0.04mol/L and 0.05mol/L into 2mol/L KOH electrolyte3Fe(CN)6Cyclic voltammogram (potential window of (-0.2V to 0.6V, scan rate of 20mV s)-1) And constant current charge and discharge curve (current density of 1A g)-1) The results are shown in FIGS. 5 and 6.
As can be seen from FIG. 6, 0.04mol/L K was added3Fe(CN)6The specific capacitance of the capacitor is the highest and can reach 245F g-1Is less than without K3Fe(CN)6Specific capacitance (170F g)-1) Increased by 44.1%, and K is added to the rest3Fe(CN)6The capacitor system of (a) is described,the specific capacitance is improved. Wherein 0.01mol/L K is added3Fe(CN)6Has a specific capacitance of 178.8F g-1And 0.02mol/L K is added3Fe(CN)6Has a specific capacitance of 184.5F g-1Adding 0.03mol/L K3Fe(CN)6Has a specific capacitance of 225F g-1Adding 0.05mol/L K3Fe(CN)6Has a specific capacitance of 219F g-1。
Example 4
0.476g of CoCl2·6H2O, 0.37g NH4F and 0.6g of CO (NH)2)2Dissolving in 60mL of deionized water, transferring the obtained uniform solution to a stainless steel high-pressure reaction kettle with a lining, putting a piece of clean foamed nickel into the reaction kettle, and placing the reaction kettle in a drying oven at 120 ℃ for reaction for 6 hours to obtain the cobalt hydroxide electrode material.
Adopting a standard three-electrode system, taking a Pt electrode as a counter electrode, taking a saturated calomel electrode as a reference electrode, taking a cobalt hydroxide electrode material as a working electrode, and respectively testing and adding 0.01mol/L, 0.02mol/L, 0.03mol/L, 0.04mol/L and 0.05mol/L K in 2mol/L KOH electrolyte3Fe(CN)6Cyclic voltammogram of (0V to 0.6V, scan rate 20mV s)-1) And constant current charge and discharge curve (current density of 1A g)-1) The results are shown in FIGS. 7 and 8.
As can be seen from FIG. 8, 0.04mol/L K was added3Fe(CN)6The specific capacitance is the highest and can reach 507.5F g-1Is less than without K3Fe(CN)6Specific capacitance (50F g)-1) Increased by 915%, and the rest is added with K3Fe(CN)6The specific capacitance of the capacitor system is improved. Wherein 0.01mol/L K is added3Fe(CN)6Has a specific capacitance of 125F g-1And 0.02mol/L K is added3Fe(CN)6Has a specific capacitance of 185F g-1Adding 0.03mol/L K3Fe(CN)6Specific capacitance of 275F g-1Adding 0.05mol/L K3Fe(CN)6Specific capacitance of 382.5F g-1。
Example 5
0.63mmol of Co (NO)3)2·6H2O and 3.12mmol of CO (NH)2)2Dissolving in 50mL of deionized water, transferring the obtained uniform solution to a stainless steel high-pressure reaction kettle with a lining, putting a piece of clean foamed nickel into the reaction kettle, and placing the reaction kettle in a 95 ℃ oven for reaction for 4 hours to obtain the cobalt oxide electrode material.
Adopting a standard three-electrode system, taking a Pt electrode as a counter electrode, taking a saturated calomel electrode as a reference electrode, taking a cobalt hydroxide electrode material as a working electrode, and respectively testing and adding 0.01mol/L, 0.02mol/L, 0.03mol/L, 0.04mol/L and 0.05mol/L K in 2mol/L KOH electrolyte3Fe(CN)6Cyclic voltammogram of (0V to 0.6V, scan rate 20mV s)-1) And constant current charge and discharge curve (current density of 1A g)-1) The results are shown in FIGS. 9 and 10.
As can be seen from FIG. 10, 0.04mol/L K was added3Fe(CN)6The specific capacitance of the capacitor is the highest and can reach 400F g-1Is less than without K3Fe(CN)6Specific capacitance (20F g)-1) Increased by 1900%, and the rest is added with K3Fe(CN)6The specific capacitance of the capacitor system is improved. Wherein 0.01mol/L K is added3Fe(CN)6Specific capacitance of 87.5F g-1And 0.02mol/L K is added3Fe(CN)6Specific capacitance of 107.5F g-1Adding 0.03mol/L K3Fe(CN)6Has a specific capacitance of 150F g-1Adding 0.05mol/L K3Fe(CN)6Has a specific capacitance of 220F g-1。
Claims (10)
1. A supercapacitor based on a cobalt-based material, characterized in that: the electrode material is cobalt molybdate, cobalt vanadate, cobalt boride, cobalt hydroxide or cobalt oxide.
2. The cobalt-based material-based supercapacitor according to claim 1, wherein: the concentration of potassium ferricyanide in the electrolyte is 0.05mol/L or less.
3. The cobalt-based material-based supercapacitor according to claim 2, wherein: in the electrolyte, the concentration of potassium ferricyanide is 0.01-0.05 mol/L, preferably the concentration of potassium ferricyanide is 0.03-0.05 mol/L, and more preferably the concentration of potassium ferricyanide is 0.04 mol/L.
4. The cobalt-based material-based supercapacitor according to any one of claims 1 to 3, wherein: the electrolyte is a potassium ferricyanide solution and a potassium hydroxide solution, and the concentration of the potassium hydroxide is 1-3 mol/L; preferably, the concentration of potassium hydroxide is 2 mol/L.
5. The cobalt-based material-based supercapacitor according to claim 1, wherein: the electrode material is prepared by a hydrothermal method.
6. The cobalt-based material-based supercapacitor according to claim 5, wherein: the electrode material is prepared by adopting a preparation method comprising the following steps:
a. cleaning the foamed nickel;
b. weighing reactants for preparing the electrode material, mixing the reactants according to theoretical dosage, dissolving the reactants in water, adding foamed nickel, and reacting at 60-150 ℃ to obtain the electrode material.
7. The cobalt-based material-based supercapacitor according to claim 6, wherein: in the step a, cleaning the foamed nickel by at least one of hydrochloric acid, acetone and deionized water.
8. The cobalt-based material-based supercapacitor according to claim 6, wherein: in the step b, when the electrode material is cobalt molybdate, the reactants are cobalt chloride and sodium molybdate;
when the electrode material is cobalt vanadate, the reactants are cobalt chloride and sodium vanadate;
when the electrode material is cobalt boride, the reactants are cobalt chloride, sodium borohydride and sodium hydroxide;
when the electrode material is cobalt hydroxide, the reactants are cobalt chloride, ammonium fluoride and urea;
when the electrode material is cobalt oxide, the reactants are cobalt nitrate and urea.
9. The cobalt-based material-based supercapacitor according to claim 6, wherein: in step b, the reaction is carried out in an autoclave.
10. The cobalt-based material-based supercapacitor according to claim 6, wherein: in the step b, the reaction time is 3-6 h.
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| US20140113200A1 (en) * | 2011-07-25 | 2014-04-24 | Fraser Seymour | Functionalized Carbon Electrode, Related Material, Process for Production, and Use Thereof |
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| CN103426649A (en) * | 2013-08-21 | 2013-12-04 | 吉林大学 | Preparation method for different carbon fibers / cobalt hydroxide electrode and solid-liquid composite electrode system |
| CN104576082A (en) * | 2015-01-16 | 2015-04-29 | 吉林大学 | Asymmetric supercapacitor with potassium ferricyanide and potassium ferrocyanide added to two electrode chambers respectively and preparation method thereof |
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