CN112279245A - Method for preparing hierarchical porous carbon for supercapacitor - Google Patents
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000008367 deionised water Substances 0.000 claims abstract description 18
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 18
- 238000005406 washing Methods 0.000 claims abstract description 18
- 230000004913 activation Effects 0.000 claims abstract description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 12
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 11
- 239000000243 solution Substances 0.000 claims abstract description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 9
- 239000010431 corundum Substances 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims abstract description 9
- 239000000376 reactant Substances 0.000 claims abstract description 9
- 239000007864 aqueous solution Substances 0.000 claims abstract description 8
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 18
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 13
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 12
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 claims description 12
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 9
- 239000011592 zinc chloride Substances 0.000 claims description 8
- 239000001110 calcium chloride Substances 0.000 claims description 6
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 6
- 239000011736 potassium bicarbonate Substances 0.000 claims description 6
- 229910000028 potassium bicarbonate Inorganic materials 0.000 claims description 6
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 235000011181 potassium carbonates Nutrition 0.000 claims description 3
- 239000011300 coal pitch Substances 0.000 claims description 2
- 238000003760 magnetic stirring Methods 0.000 claims description 2
- 235000015497 potassium bicarbonate Nutrition 0.000 claims description 2
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 claims description 2
- 235000005074 zinc chloride Nutrition 0.000 claims description 2
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 claims 1
- 238000000975 co-precipitation Methods 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 150000003839 salts Chemical class 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 21
- 239000000203 mixture Substances 0.000 description 8
- 239000011148 porous material Substances 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000011294 coal tar pitch Substances 0.000 description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- ONIOAEVPMYCHKX-UHFFFAOYSA-N carbonic acid;zinc Chemical compound [Zn].OC(O)=O ONIOAEVPMYCHKX-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910001868 water Inorganic materials 0.000 description 2
- 239000011667 zinc carbonate Substances 0.000 description 2
- 229910000010 zinc carbonate Inorganic materials 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 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
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/342—Preparation characterised by non-gaseous activating agents
- C01B32/348—Metallic compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
- C01B32/33—Preparation characterised by the starting materials from distillation residues of coal or petroleum; from petroleum acid sludge
-
- 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
- H01G11/24—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
-
- 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
- H01G11/32—Carbon-based
- H01G11/44—Raw materials therefor, e.g. resins or coal
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Power Engineering (AREA)
- Organic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention provides a method for preparing hierarchical porous carbon for a supercapacitor, and belongs to the technical field of carbon material preparation. The method comprises the following specific steps: respectively dissolving chloride and carbonate in deionized water, slowly dripping an aqueous solution of the carbonate into the aqueous solution of the chloride, magnetically stirring for a period of time after dripping, then adding a carbon source into the solution, magnetically stirring, putting into an oven, and preserving heat; transferring the obtained reactant into a corundum crucible, and preserving heat under Ar protective atmosphere; and cooling the product obtained by activation to room temperature, taking out, adding dilute hydrochloric acid, carrying out ultrasonic washing, washing with deionized water until the pH value is 7 to obtain porous carbon, and drying to obtain the hierarchical porous carbon material. The one-step coprecipitation strategy can provide a hard template required by preparation of the porous carbon material and also can provide a salt template, and has physical activation and chemical activation effects, so that the prepared hierarchical porous carbon material has excellent electrochemical performance.
Description
Technical Field
The invention belongs to the technical field of carbon material preparation, and particularly relates to a method for preparing hierarchical porous carbon for a supercapacitor by adopting a coprecipitation strategy.
Background
The porous carbon material is widely applied to the fields of adsorption, catalysis and energy storage due to high specific surface area, thermal stability, chemical stability and rich sources. The pore structure of the porous material can be classified according to the pore size: macropores (>50nm), mesopores (2-50nm) and micropores (<2 nm). In the field of electrochemical storage, a large hole is used as a 'reservoir' of electrolyte, and the path of ion diffusion is reduced; while the role of mesopores and micropores is to provide channels for free access of electrolyte ions, resulting in high specific capacitance and energy density. Therefore, the reasonable construction of the novel macroporous-mesoporous-microporous hierarchical porous carbon material has important significance.
The preparation of the graded porous carbon material by the hard template method is an important development direction of the carbon material used in the field of energy storage. The hard mold plates are usually used as oxides, hydroxides and carbonates of Zn base, Mg base, Fe base and Ca, etc. The template method has an advantage that the pore size distribution can be finely adjusted by adjusting the size of the template, thereby realizing an extremely narrow pore size distribution. However, the synthesis and removal of the hard template is an expensive and cumbersome process that increases the complexity and cost of production. Furthermore, the structural characteristics of the porous carbon produced by hard templates depend to a large extent on the nature of the template used. The porous carbon prepared by the template method is generally characterized by macropores and mesopores, and the specific surface area is relatively low. It is necessary to prepare carbon materials with high specific area, high pore volume and high microporosity by adopting a chemical activation method. Therefore, the method for synthesizing the hierarchical porous carbon material by exploring a novel hard template method has important practical significance.
Disclosure of Invention
The invention provides a method for preparing a porous carbon material in one step by a coprecipitation strategy aiming at the defects in the technology for preparing the porous carbon material by a hard template method.
In order to achieve the purpose, the technical scheme of the invention is realized by the following modes:
the invention provides a method for preparing hierarchical porous carbon for a supercapacitor, which specifically comprises the following steps:
(1) respectively dissolving chloride and carbonate in deionized water, slowly dripping the aqueous solution of the carbonate into the aqueous solution of the chloride, magnetically stirring after dripping, then adding a carbon source into the solution, magnetically stirring for 30min, putting into an oven, and preserving heat for 24h at 100 ℃.
The mol ratio of the chloride to the carbonate is 1: 8-20; the magnetic stirring time is 2-6 h; the mol ratio of the chloride to the carbon source is 1: 6-10.
(2) Transferring the reactant obtained in the step (1) into a corundum crucible, and keeping the temperature of 800 ℃ for 2 hours under Ar protective atmosphere; and cooling the product obtained by activation to room temperature, taking out and putting the product into a beaker, adding dilute hydrochloric acid for ultrasonic washing, then washing the product with deionized water until the pH value is 7 to obtain porous carbon, and drying the washed porous carbon in an oven to obtain the hierarchical porous carbon material for the supercapacitor.
Further, the chloride is one or a mixture of two of zinc chloride, ferric chloride, magnesium chloride and calcium chloride.
Further, the carbonate is one or a mixture of potassium carbonate and potassium bicarbonate.
Further, the carbon source is one of coal tar pitch and anthracene oil.
The basic principle of the invention is (taking potassium carbonate as an example for illustration):
(1)2FeCl3+3K2CO3+3H2O＝6KCl+2Fe(OH)3↓+3CO2↑
(2)CaCl2+K2CO3＝CaCO3↓+2KCl
(3)3ZnCl2+3K2CO3+3H2O＝ZnCO3·2Zn(OH)2↓+6KCl+2CO2↑
ZnCO3·2Zn(OH)2＝ZnO+O2↑+2H2O↑
(4)MgCl2+K2CO3＝MgCO3↓+2KCl；MgCO3+H2O＝Mg(OH)2↓+CO2↑
compared with the prior art, the invention has the following advantages:
1. the invention adopts a one-step coprecipitation strategy to prepare a hard template (such as Fe (OH) at the right time)3,CaCO3,ZnO,Mg(OH)2Etc.), the obtained byproduct KCl can also be used as a salt template to carry out pore-forming on the carbon material at the right moment, and gas (CO) generated in the heating process2,H2O) can also play a role in physical activation, so that the prepared hierarchical porous carbon material has excellent electrochemical performance.
2. The carbonate used in the present invention has an activating effect in addition to its function as a precipitant. Compared with the common strong base chemical activating agents such as KOH and NaOH, the corrosion effect on equipment is poor, and the environment-friendly effect is achieved.
3. The carbon source of the invention adopts coal pitch or anthracene oil which are used as byproducts of coal coking and have the advantages of large amount, easy obtaining and low cost.
Drawings
FIG. 1 is a CV curve of a supercapacitor assembled with a porous carbon material prepared in example 3 of the present invention;
as can be seen from the figure, the specific capacitance value of the obtained super capacitor is 165F g-1。
FIG. 2 is an SEM photograph of a porous carbon material prepared in example 3 of the present invention;
honeycomb-shaped porous carbon can be observed from the figure.
Detailed Description
The following examples further illustrate the preparation of porous carbon materials for supercapacitors by one of the coprecipitation strategies of the present invention.
Example 1
(1) Reacting ZnCl2And K2CO3Dissolving the K into deionized water according to the molar ratio of 1:8 respectively, and then adding the K2CO3Is slowly dripped into ZnCl2After the dropwise addition, the mixture is magnetically stirred for 2 hours and then mixed with ZnCl2Adding the coal tar pitch with the molar ratio of 1:6 into the solution, magnetically stirring for 30min, putting into an oven, and keeping the temperature at 100 ℃ for 24 h.
(2) And (2) transferring the reactant obtained in the step (1) into a corundum crucible, and keeping the temperature of 800 ℃ for 2 hours under the Ar protective atmosphere. And cooling the product obtained by activation to room temperature, taking out and putting the product into a beaker, adding a certain amount of 2M dilute hydrochloric acid, carrying out ultrasonic washing for 1h, then washing the product with deionized water until the pH value is about 7 to obtain porous carbon, and drying the washed porous carbon in an oven to obtain the hierarchical porous carbon material for the supercapacitor. The CV curve of the supercapacitor assembled by the porous carbon material shows that the specific capacitance value of the obtained device is 155Fg-1。
Example 2
(1) FeCl is added3And K2CO3Dissolving the K into deionized water according to the molar ratio of 1:20 respectively, and then adding the K2CO3The aqueous solution of (A) is slowly added dropwise to FeCl3After the dropwise addition, the mixture is magnetically stirred for 6 hours and then mixed with FeCl3Adding anthracene oil with the molar ratio of 1:10 into the solution, magnetically stirring for 30min, putting into an oven, and keeping the temperature at 100 ℃ for 24 h.
(2) And (2) transferring the reactant obtained in the step (1) into a corundum crucible, and keeping the temperature of 800 ℃ for 2 hours under the Ar protective atmosphere. And cooling the product obtained by activation to room temperature, taking out and putting the product into a beaker, adding a certain amount of 2M dilute hydrochloric acid, carrying out ultrasonic washing for 1h, then washing the product with deionized water until the pH value is about 7 to obtain porous carbon, and drying the washed porous carbon in an oven to obtain the hierarchical porous carbon material for the supercapacitor. The GCD curve of the supercapacitor assembled by the porous carbon material shows that the specific capacitance value of the obtained device is 150.8F g-1。
Example 3
(1) Mixing MgCl2And K2CO3Respectively dissolving the components in deionized water according to the molar ratio of 1:12, and then adding K2CO3Is slowly added dropwise to the MgCl2Is dissolved in waterIn the solution, after the dropwise addition is finished, the mixture is magnetically stirred for 4 hours and then is mixed with MgCl2Adding anthracene oil with the molar ratio of 1:8 into the solution, magnetically stirring for 30min, putting into an oven, and keeping the temperature at 100 ℃ for 24 h.
(2) And (2) transferring the reactant obtained in the step (1) into a corundum crucible, and keeping the temperature of 800 ℃ for 2 hours under the Ar protective atmosphere. And cooling the product obtained by activation to room temperature, taking out and putting the product into a beaker, adding a certain amount of 2M dilute hydrochloric acid, carrying out ultrasonic washing for 1h, then washing the product with deionized water until the pH value is about 7 to obtain porous carbon, and drying the washed porous carbon in an oven to obtain the hierarchical porous carbon material for the supercapacitor. The CV curve of the supercapacitor assembled by the porous carbon material shows that the specific capacitance value of the obtained device is 165Fg-1。
Example 4
(1) Adding CaCl2And K2CO3Respectively dissolving the components in deionized water according to the molar ratio of 1:16, and then adding K2CO3Slowly dropwise adding the aqueous solution into CaCl2After the dropwise addition, the mixture is magnetically stirred for 5 hours and then mixed with CaCl2Adding the coal tar pitch with the molar ratio of 1:7 into the solution, magnetically stirring for 30min, putting into an oven, and keeping the temperature at 100 ℃ for 24 h.
(2) And (2) transferring the reactant obtained in the step (1) into a corundum crucible, and keeping the temperature of 800 ℃ for 2 hours under the Ar protective atmosphere. And cooling the product obtained by activation to room temperature, taking out and putting the product into a beaker, adding a certain amount of 2M dilute hydrochloric acid, carrying out ultrasonic washing for 1h, then washing the product with deionized water until the pH value is about 7 to obtain porous carbon, and drying the washed porous carbon in an oven to obtain the hierarchical porous carbon material for the supercapacitor. The GCD curve of the supercapacitor assembled by the porous carbon material shows that the specific capacitance value of the obtained device is 156.8F g-1。
Example 5
(1) Reacting ZnCl2And KHCO3Respectively dissolving in deionized water according to the molar ratio of 1:14, and then adding KHCO3Is slowly dripped into ZnCl2After the dropwise addition, the mixture is magnetically stirred for 4 hours and then mixed with ZnCl2Coal tar pitch with a molar ratio of 1:6Adding cyan into the solution, magnetically stirring for 30min, placing into an oven, and keeping the temperature at 100 deg.C for 24 h.
(2) And (2) transferring the reactant obtained in the step (1) into a corundum crucible, and keeping the temperature of 800 ℃ for 2 hours under the Ar protective atmosphere. And cooling the product obtained by activation to room temperature, taking out and putting the product into a beaker, adding a certain amount of 2M dilute hydrochloric acid, carrying out ultrasonic washing for 1h, then washing the product with deionized water until the pH value is about 7 to obtain porous carbon, and drying the washed porous carbon in an oven to obtain the hierarchical porous carbon material for the supercapacitor. The CV curve of the supercapacitor assembled by the porous carbon material shows that the specific capacitance value of the obtained device is 90F g-1。
Example 6
(1) Mixing MgCl2And KHCO3Respectively dissolving in deionized water according to the molar ratio of 1:17, and then adding KHCO3Is slowly added dropwise to the MgCl2After the dropwise addition, the mixture is magnetically stirred for 6 hours and then mixed with MgCl2Adding anthracene oil with the molar ratio of 1:9 into the solution, magnetically stirring for 30min, putting into an oven, and keeping the temperature at 100 ℃ for 24 h.
(2) And (2) transferring the reactant obtained in the step (1) into a corundum crucible, and keeping the temperature of 800 ℃ for 2 hours under the Ar protective atmosphere. And cooling the product obtained by activation to room temperature, taking out and putting the product into a beaker, adding a certain amount of 2M dilute hydrochloric acid, carrying out ultrasonic washing for 1h, then washing the product with deionized water until the pH value is about 7 to obtain porous carbon, and drying the washed porous carbon in an oven to obtain the hierarchical porous carbon material for the supercapacitor. The GCD curve of the supercapacitor assembled by the porous carbon material shows that the specific capacitance value of the obtained device is 84.4F g-1。
Claims (4)
1. A method for preparing hierarchical porous carbon for a supercapacitor is characterized by comprising the following steps,
(1) respectively dissolving chloride and carbonate in deionized water, slowly dripping an aqueous solution of the carbonate into an aqueous solution of the chloride, magnetically stirring after dripping, then adding a carbon source into the solution, magnetically stirring for 30min, putting into an oven, and preserving heat for 24h at 100 ℃;
the mol ratio of the chloride to the carbonate is 1: 8-20; the magnetic stirring time is 2-6 h; the mol ratio of the chloride to the carbon source is 1: 6-10;
(2) transferring the reactant obtained in the step (1) into a corundum crucible, and keeping the temperature of 800 ℃ for 2 hours under Ar protective atmosphere; and cooling the product obtained by activation to room temperature, taking out and putting the product into a beaker, adding dilute hydrochloric acid for ultrasonic washing, then washing the product with deionized water until the pH value is 7 to obtain porous carbon, and drying the washed porous carbon in an oven to obtain the hierarchical porous carbon material for the supercapacitor.
2. The method of preparing hierarchical porous carbon for supercapacitors according to claim 1, wherein said chloride is one or both of zinc chloride, iron chloride, magnesium chloride and calcium chloride.
3. The method of preparing hierarchical porous carbon for supercapacitors according to claim 1, wherein said carbonate is one or both of potassium carbonate and potassium bicarbonate.
4. The method of preparing hierarchical porous carbon for supercapacitors according to claim 1, wherein said carbon source is coal pitch or anthracene oil.
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