CN113023704A - Preparation method of coralline cobalt pyrophosphate supercapacitor electrode material - Google Patents
Preparation method of coralline cobalt pyrophosphate supercapacitor electrode material Download PDFInfo
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- JECJVZVHLPZRNM-UHFFFAOYSA-J cobalt(2+);phosphonato phosphate Chemical compound [Co+2].[Co+2].[O-]P([O-])(=O)OP([O-])([O-])=O JECJVZVHLPZRNM-UHFFFAOYSA-J 0.000 title claims abstract description 35
- 239000007772 electrode material Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 238000001354 calcination Methods 0.000 claims abstract description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 11
- 239000010935 stainless steel Substances 0.000 claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims abstract description 8
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 8
- 239000012498 ultrapure water Substances 0.000 claims abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 7
- 239000010941 cobalt Substances 0.000 claims abstract description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 239000011574 phosphorus Substances 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 7
- 238000001291 vacuum drying Methods 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- 239000011259 mixed solution Substances 0.000 claims abstract description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims abstract description 3
- UQEXUNADTVCXEU-UHFFFAOYSA-L cobalt(2+);hydrogen phosphate Chemical compound [Co+2].OP([O-])([O-])=O UQEXUNADTVCXEU-UHFFFAOYSA-L 0.000 claims description 9
- 239000002243 precursor Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 239000006260 foam Substances 0.000 claims description 4
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 4
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 4
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 4
- GFHNAMRJFCEERV-UHFFFAOYSA-L cobalt chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Co+2] GFHNAMRJFCEERV-UHFFFAOYSA-L 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical group [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 2
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 abstract description 4
- 239000002086 nanomaterial Substances 0.000 abstract description 4
- 238000004146 energy storage Methods 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 229910000319 transition metal phosphate Inorganic materials 0.000 description 2
- 241001460678 Napo <wasp> Species 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000002322 conducting polymer Substances 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 238000002484 cyclic voltammetry Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000037427 ion transport Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/38—Condensed phosphates
- C01B25/42—Pyrophosphates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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, LIGHT-SENSITIVE OR TEMPERATURE-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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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C01—INORGANIC CHEMISTRY
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- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/40—Electric properties
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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
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Abstract
The invention discloses a preparation method of a coralline cobalt pyrophosphate supercapacitor electrode material, and particularly relates to the technical field of nano materials. A preparation method of a coralline cobalt pyrophosphate supercapacitor electrode material comprises the following steps: adding a cobalt source and a phosphorus source into a beaker filled with ultrapure water, adding a surfactant into the beaker, magnetically stirring until the solution is uniformly mixed, placing the mixed solution and foamed nickel into an inner container of a polytetrafluoroethylene reaction kettle, transferring the inner container into a stainless steel reaction kettle, and placing the stainless steel reaction kettle into an oven for reaction; after the reaction kettle is cooled to room temperature, washing the foamed nickel for multiple times by using ethanol and ultrapure water, and finally drying in a vacuum drying oven to obtain the foamed nickel; and putting the foamed nickel into a tube furnace, and calcining at the temperature of 600 ℃ under the protection of nitrogen atmosphere to obtain the cobalt pyrophosphate electrode material. By adopting the technical scheme of the invention, the cobalt pyrophosphate electrode material with high crystallinity, unique appearance and excellent performance can be prepared and can be used as an electrode material of a super capacitor.
Description
Technical Field
The invention relates to the technical field of nano materials, in particular to a preparation method of a coralliform cobalt pyrophosphate supercapacitor electrode material.
Background
With the rapid development of economy and the consumption of non-renewable energy, people are continuously searching for energy storage devices which can be developed continuously. Thus, clean energy storage devices, such as solar, tidal, wind, geothermal, etc., which are renewable energy sources, are emerging at the forefront of the public. Due to the seasonal, geographical and temporal uncertainty of these renewable energy sources, there is a pressing need to develop reliable, efficient, low-cost energy storage devices. After long-term exploration by researchers, lead-acid batteries and nickel-cadmium-nickel-hydrogen secondary batteries are gradually developed and become the dominant force of energy storage markets at that time. However, the pollution to the ecological environment is serious due to the use of toxic and harmful heavy metals such as lead, cadmium, nickel and the like, and the energy density of the heavy metals still does not reach an ideal value, so that the environmental protection and safety of novel clean energy are not met. The lithium ion batteries that have subsequently emerged are widely reported and commercially produced due to their high energy density, smooth discharge, and wide operating temperature range. Because the low power density of the lithium ion battery cannot meet the requirement of a high-power energy storage device in actual production, researchers explore an energy storage device, namely a super capacitor, which has high power density, high energy density, long cycle life and good rate capability.
The performance of supercapacitors is mainly determined by electrode materials, including electric double layer capacitor electrode materials (activated carbon, graphene, carbon black), pseudocapacitor electrode materials (metal oxides, hydroxides, nitrides, sulfides, phosphides, conducting polymers, etc.). Particularly, the transition metal phosphate material has diversity in structure, can provide rich active sites for reaction, and has strong P-O covalent bond in the structure, so that the material has good cycling stability. Therefore, the transition metal phosphate material is a kind of electrode material with great potential. The two-dimensional nano material is used as the electrode material of the super capacitor, and due to the high specific surface area and the exposed active sites, the charge transfer in the electrolyte is promoted, and the degree of the redox reaction is more favorable.
Disclosure of Invention
The invention aims to provide a preparation method of a coralline cobalt pyrophosphate supercapacitor electrode material, and the cobalt pyrophosphate electrode material with high crystallinity, unique appearance and excellent performance is obtained.
In order to achieve the purpose, the technical scheme of the invention is as follows: a preparation method of a coralline cobalt pyrophosphate supercapacitor electrode material comprises the following steps:
s1, growing cobalt hydrogen phosphate precursor on the foamed nickel current collector
Adding a cobalt source and a phosphorus source into a beaker filled with ultrapure water according to a proper proportion, then adding a surfactant into the beaker, magnetically stirring until the solution is uniformly mixed, wherein the surfactant is polyvinylpyrrolidone, placing the mixed solution and cleaned foam nickel into an inner container of a polytetrafluoroethylene reaction kettle, transferring the inner container into a stainless steel reaction kettle, and placing the stainless steel reaction kettle into an oven for reaction for 20 hours; after the stainless steel reaction kettle is cooled to room temperature, washing the foamed nickel for multiple times by using ethanol and ultrapure water, and finally drying in a vacuum drying oven to obtain the foamed nickel loaded with the cobalt hydrogen phosphate precursor;
s2 preparation of cobalt pyrophosphate on foamed nickel current collector
And (3) putting the foamed nickel loaded with the cobalt hydrogen phosphate precursor in S1 into a tube furnace, heating to 200-600 ℃ at the speed of 10 ℃/min under the protection of nitrogen atmosphere, and calcining to obtain the cobalt pyrophosphate electrode material.
Further, the cobalt source in step S1 is cobalt chloride hexahydrate, the phosphorus source is sodium hexametaphosphate, and the mass ratio of the cobalt source to the phosphorus source is 1: 1.
Further, the amount of the surfactant added was 0.1 g.
Further, the hydrothermal temperature in step S1 was 50 ℃.
Further, the calcination temperature in step S2 was 600 ℃ and the calcination time was 0.5 h.
Further, the cobalt pyrophosphate electrode material is prepared in 1Ag-1Specific capacitance at current density of 185.3F g-1。
Compared with the prior art, the beneficial effect of this scheme:
1. the cobalt pyrophosphate prepared by the scheme has a unique coral-shaped morphology structure, the diameter is about 100 nanometers, and the excellent nano-scale coral-shaped structure is beneficial to the effective transmission of ions and charges at an electrode/electrolyte interface.
2. According to the scheme, cobalt pyrophosphate directly grows on the foamed nickel current collector to serve as an electrode, and no binder is used in the process, so that the interface contact resistance is reduced, and the electrochemical performance is improved.
3. The two-step method of the scheme has the advantages of simple and convenient operation, mild conditions and rich raw material sources, and the obtained cobalt pyrophosphate has very high crystallinity.
Drawings
FIG. 1 is an XRD pattern of cobalt pyrophosphate, an electrode material prepared in example 1;
FIG. 2 is an SEM photograph of the electrode material cobalt pyrophosphate prepared in example 1;
FIG. 3 is a constant current charge and discharge curve of the electrode material cobalt pyrophosphate prepared in example 1;
FIG. 4 is a cyclic voltammogram of cobalt pyrophosphate as the electrode material prepared in example 1.
Detailed Description
The present invention will be described in further detail below by way of specific embodiments:
example 1
As shown in figures 1 and 2: a preparation method of a coralline cobalt pyrophosphate supercapacitor electrode material comprises the following steps:
s1, growing cobalt hydrogen phosphate precursor on the foamed nickel current collector
0.238g of CoCl6H2O and (NaPO)3)6Dissolved in a beaker containing 40mL of ultrapure water, then 0.1g of PVP (polyvinylpyrrolidone) was added to the beaker and stirred on a magnetic stirrer for 0.5h, at which time the solution stirred well and the solution was pink. Placing the pink solution and cleaned nickel foam (nickel foam size 1cm x 1cm) in 50mL polytetrafluoroethylene reaction kettle, transferring to stainless steel reaction kettle, screwing down the cover, and placing the stainless steel reaction kettle inAnd (4) an oven, and reacting the pink solution for 20 hours at the temperature of 50 ℃. After the stainless steel reaction kettle is cooled to room temperature, taking out the foamed nickel, washing the foamed nickel for multiple times by using absolute ethyl alcohol and ultrapure water, and finally drying the washed foamed nickel in a vacuum drying oven at 35 ℃ for one night to obtain foamed nickel loaded with a cobalt hydrogen phosphate precursor;
s2 preparation of cobalt pyrophosphate on foamed nickel current collector
And taking out the foamed nickel loaded with the cobalt hydrogen phosphate precursor in the vacuum drying oven, putting the foamed nickel into a porcelain boat, putting the porcelain boat into a tubular furnace, connecting the device, and introducing nitrogen for about 20 minutes. And finally, setting a temperature rise program, raising the temperature to 600 ℃ at the speed of 10 ℃/min for calcining, wherein the calcined test piece is calcined for 30 minutes, and taking out the foamed nickel after the tubular furnace is cooled to the room temperature to obtain the cobalt pyrophosphate electrode material.
Example 2
The present example is different from example 1 only in the calcination temperature, and the tube furnace of step S2 in the present example was heated to 200 ℃ to perform calcination.
Example 3
The present example is different from example 1 only in the calcination temperature, and the tube furnace of step S2 in the present example is heated to 400 ℃ for calcination.
Example 4
The present example is different from example 1 only in the calcination temperature, and the tube furnace of step S2 in the present example is heated to 500 ℃ for calcination.
Electrochemical tests were performed on the cobalt pyrophosphate electrode materials prepared in the above examples 1 to 4, using a conventional beaker type three-electrode system (foamed nickel as a working electrode, platinum as a counter electrode, and saturated calomel as a reference electrode), the electrolyte was a KOH solution with a concentration of 2mol/L, and using CHI760E electrochemical workstation of chenhua in shanghai, the implementation results were as follows:
as shown in FIG. 1, it can be seen from FIG. 1 that the cobalt pyrophosphate synthesized by this method has very good crystallinity and no other impurities, indicating that the phase of the product is single.
As shown in FIG. 2, it is understood from FIG. 2 that cobalt pyrophosphate is coral-shaped and has a uniform size, an average size of about 100nm, and a special coral-shaped nanostructure has many pseudocapacitance active sites, which promotes the ion transport rate at the electrode/electrolyte interface.
As shown in FIGS. 3 and 4, when the current density is 1A g-1Specific capacitance of 185.3F g-1And the faradaic reaction of the electrode material can be represented by the following equation:
the foregoing are merely examples of the present invention and common general knowledge of known specific structures and/or features of the schemes has not been described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (6)
1. A preparation method of a coralline cobalt pyrophosphate supercapacitor electrode material is characterized by comprising the following steps: the method comprises the following steps:
s1, growing cobalt hydrogen phosphate precursor on the foamed nickel current collector
Adding a cobalt source and a phosphorus source into a beaker filled with ultrapure water according to a proper proportion, then adding a surfactant into the beaker, magnetically stirring until the solution is uniformly mixed, wherein the surfactant is polyvinylpyrrolidone, placing the mixed solution and cleaned foam nickel into an inner container of a polytetrafluoroethylene reaction kettle, transferring the inner container into a stainless steel reaction kettle, and placing the stainless steel reaction kettle into an oven for reaction for 20 hours; after the stainless steel reaction kettle is cooled to room temperature, washing the foamed nickel for multiple times by using ethanol and ultrapure water, and finally drying in a vacuum drying oven to obtain the foamed nickel loaded with the cobalt hydrogen phosphate precursor;
s2 preparation of cobalt pyrophosphate on foamed nickel current collector
And (3) putting the foamed nickel loaded with the cobalt hydrogen phosphate precursor in S1 into a tube furnace, heating to 200-600 ℃ at the speed of 10 ℃/min under the protection of nitrogen atmosphere, and calcining to obtain the cobalt pyrophosphate electrode material.
2. The preparation method of the coralliform cobalt pyrophosphate supercapacitor electrode material as claimed in claim 1, wherein the preparation method comprises the following steps: the cobalt source in the step S1 is cobalt chloride hexahydrate, the phosphorus source is sodium hexametaphosphate, and the mass ratio of the cobalt source to the phosphorus source is 1: 1.
3. The preparation method of the coralliform cobalt pyrophosphate supercapacitor electrode material as claimed in claim 2, wherein the preparation method comprises the following steps: the amount of the surfactant added was 0.1 g.
4. The preparation method of the coralliform cobalt pyrophosphate supercapacitor electrode material as claimed in claim 1, wherein the preparation method comprises the following steps: the hydrothermal temperature in step S1 was 50 ℃.
5. The preparation method of the coralliform cobalt pyrophosphate supercapacitor electrode material as claimed in claim 1, wherein the preparation method comprises the following steps: the calcination temperature in step S2 was 600 ℃ and the calcination time was 0.5 h.
6. The method for preparing the coralliform cobalt pyrophosphate supercapacitor electrode material according to any one of claims 1 to 5, which is characterized in that: the cobalt pyrophosphate electrode material is prepared from 1Ag-1Specific capacitance at current density of 185.3F g-1。
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| CN113772648A (en) * | 2021-09-24 | 2021-12-10 | 江南大学 | Homogeneous C, N co-doped phosphate material and preparation method and application thereof |
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