CN108439402B - A kind of supercapacitor ginger stalk matrix activated carbon and preparation method thereof - Google Patents
A kind of supercapacitor ginger stalk matrix activated carbon and preparation method thereof Download PDFInfo
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- CN108439402B CN108439402B CN201810574215.2A CN201810574215A CN108439402B CN 108439402 B CN108439402 B CN 108439402B CN 201810574215 A CN201810574215 A CN 201810574215A CN 108439402 B CN108439402 B CN 108439402B
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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
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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
- C01B32/318—Preparation characterised by the starting materials
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
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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
- H01G11/34—Carbon-based characterised by carbonisation or activation of carbon
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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
- H01G11/44—Raw materials therefor, e.g. resins or coal
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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 discloses a kind of supercapacitor ginger stalk matrix activated carbons and preparation method thereof, and the ginger stalk after choosing harvest carries out dehydration and drying processing；Ginger stalk after drying is crushed to powder with pulverizer, is placed in drier stand-by；Smashed ginger straw powder is carbonized under inert gas atmosphere；To the end of charring process, gained carbide is subjected to pickling, impurity and ash content therein is removed, then impregnates gained carbide with alkali metal hydroxide, be subsequently placed under inert gas atmosphere and activated；After technique to be activated, resulting ginger straw base porous activated carbon is washed, therein organic and inorganic impurity and drying is removed, supercapacitor ginger straw base absorbent charcoal material can be obtained.Preparation process cleaning of the present invention, product structure multiplicity is controllable, and capacitive property high rate capability is excellent, and with the increase of quality electric current, specific capacitance numerical reduction is slow.
Description
Technical field
The invention belongs to absorbent charcoal material and carbonization-activation preparation process fields, specifically design a kind of forthright with excellent times
The super-activated carbon ginger straw base absorbent charcoal material and its carbonization-activation preparation method and application of energy.
Background technique
Supercapacitor is also known as large value capacitor, electrochemical capacitor or double layer capacitor, is one kind between battery
Have both the new type of energy storage device of the two feature between common power.With ultra-high capacity amount, high-specific-power, charging rate it is fast,
Long service life, cryogenic property are superior, leakage current is minimum, standing time is long, use temperature range is wide, non-maintaining, safety collar
The features such as guarantor.It is applied to electronics industry, electric car and hybrid vehicle, solar energy and wind-power electricity generation, military neck at present more
Domain and industrial circle etc..The U.S., Europe, Japan etc. are also in the research for carrying out supercapacitor.
Electrode material is the core component of supercapacitor, plays key effect to the performance of supercapacitor, therefore
It is content most crucial in supercapacitor research that researching and developing, which has the electrode material of excellent electrochemical performance,.Electrode material mainly has
3 major class of porous carbon material, metal oxide and conducting polymer, wherein porous carbon material is due to its good stable charge/discharge
Extensive concern and currently the only industrialized electrode material by academia and industry.It can be used as super capacitor
The porous charcoal of device electrode material mainly active charcoal, charcoal-aero gel, carbon nanotube etc., wherein active carbon is because having specific surface area
Greatly, pore structure is abundant, chemical stability height, good conductivity, easy Reusability, cheap and preparation process are simply etc. excellent
Point is always the preferred material for preparing electrode of super capacitor.
At present in the various electrode materials of supercapacitor, prepared as raw material by chemical activation method using biomass
Carbon material specific surface area with higher is a kind of ideal electrode material for super capacitor.Biomass is a kind of important
Active carbon prepare raw material, commonly mainly traditional agriculture and forestry biomass, including various agricultural crop straws, timber, fruit
Shell, fruit stone, rice husk etc..
Li Xueliang et al. discloses a kind of method with stalk production organic system activated carbon for super capacitors material, wherein
Stalk include rape stalk, wheat stalk, cotton stalk, rice straw, corn stover, broomcorn straw, sesame stalk, bamboo shoots
Clothing, although having biggish specific capacitance value by organic system activated carbon for super capacitors prepared by the above stalk, it is than electricity
Capacitance decays relatively seriously at higher current densities, is not suitable for using under operating condition under larger current.
Therefore, it is necessary to develop the biomass super-activated carbon of the novel supercapacitor of one kind and its preparation side at present
Method, with solve existing product structure is single, capacitive property is low, it is at high cost and with quality electric current increase specific capacitance decaying it is larger
The problem of.
Summary of the invention
For the above prior art, present invention aim to address existing product structure is single, capacitive property is low, at high cost
And decay larger problem as quality electric current increases specific capacitance, therefore, the present invention proposes a kind of with excellent high rate performance
Supercapacitor ginger straw base absorbent charcoal material and its carbonization-activation preparation method, preparation process cleaning, step is simple, product
Various structures are controllable, and capacitive property high rate capability is excellent, and manufacturing cost is low.It is specific:
An object of the present invention is to provide a kind of application of ginger stalk in the electrode material of preparation supercapacitor.
The second object of the present invention is to provide a kind of preparation method of ginger stalk super active carbon.
The third object of the present invention is to provide a kind of ginger stalk super active carbon.
The fourth object of the present invention is to provide a kind of application of ginger stalk super active carbon in supercapacitor.
The fifth object of the present invention is to provide a kind of electrode material for supercapacitor.
To achieve the above object, the present invention specifically uses following technical scheme:
In the first aspect of the invention, a kind of ginger stalk answering in the electrode material of preparation supercapacitor is provided
With.
In the second aspect of the invention, a kind of preparation method of ginger stalk super active carbon is provided, this method includes
Following steps:
(1) raw material preparation: choosing ginger stalk, dry after cleaning removal impurity dehydration；
(2) preparation of presoma: the ginger stalk after drying is crushed to powdered；
(3) it carbonizes: powdered ginger stalk is carbonized under inert gas atmosphere；
(4) pickling: the carbide that charing is obtained carries out pickling；
(5) it activates: the carbide after pickling being impregnated in potassium hydroxide solution, is activated after dipping；
(6) it washs drying: the product after activation being subjected to washing and is dried to obtain ginger stalk super active carbon.
In the third aspect of the invention, a kind of ginger straw base super-active being prepared using the above method is provided
Charcoal.
In the fourth aspect of the invention, a kind of above-mentioned ginger stalk super active carbon answering in supercapacitor is provided
With.
In a fifth aspect of the invention, a kind of electrode material for supercapacitor is provided, which is to adopt
It is prepared with above-mentioned ginger stalk super active carbon.
Compared with prior art, technical solution of the present invention has the advantages that
(1) corresponding ginger straw base porous active Carbon Materials being prepared using potassium hydroxide carbonization-activation method, operation is simple, and
Only by changing the temperature of charing, the pore-size distribution of the time of charing and charcoal alkali than resulting activated carbon sample can be regulated and controled
Its electrode material as supercapacitor of range can be respectively provided with excellent high rate performance, and increase when ratio in quality electric current
The attenuation of capacitor is relatively lower, has potential using value.
(2) rich in potassium and compared to the relatively more boron elements of other biological matter, potassium in the ginger stalk selected by the present invention
Play the role of in activation process promote reaming activation, and boron element prepare benefit played in active carbon process be can
With allow activated carbon surface wetability to be improved between electrolyte and sector electrode impedance reduce, can produce Faraday pseudo-capacitance to
The specific capacitance of active carbon is effectively improved, and silicon content is low in ginger stalk, the salt content insoluble in hydrochloric acid is lower, is easier to
Pickling.Provide a kind of higher value application method for effectively solving ginger place of production ginger stalk.
(3) technique, which can be prepared efficiently, collects the chemicals such as terpene, phenol, acid, aldehyde in ginger stalk pyrolytic process, recycles ginger straw
The fertilizer elements such as potassium, boron in stalk.
Detailed description of the invention
The Figure of description for constituting a part of the invention is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.
Fig. 1 is ginger stalk matrix activated carbon (800 DEG C) N prepared by example 12Adsorption-desorption isothermal.
Fig. 2 is ginger stalk matrix activated carbon (800 DEG C) pore size distribution range figure prepared by example 1.
Fig. 3 is ginger stalk matrix activated carbon (800 DEG C) constant current charge-discharge curve prepared by example 1.
Fig. 4 is ginger stalk matrix activated carbon (800 DEG C) Cyclic voltamogram curve prepared by example 1.
Fig. 5 is ginger stalk matrix activated carbon (800 DEG C) high rate performance prepared by example 1.
Specific embodiment
It is noted that described further below be all exemplary, it is intended to provide further instruction to the present invention.Unless another
It indicates, all technical and scientific terms used herein has usual with general technical staff of the technical field of the invention
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to exemplary embodiments of the present invention.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation and/or their combination.
As background technique is introduced, deposited in the prior art as the activated carbon from activated sludge of electrode material for super capacitor
In certain deficiency, in order to solve technical problem as above, the invention proposes a kind of ginger stalks in preparation supercapacitor
Application in electrode material.
In the present invention, ginger stalk has very high Determination of Potassium, is 70~80 (w/w) % in content of ashes,
Low-down silicon content is less than or equal to 2.5 (w/w) % in content of ashes, and different compared to other stalks certain
Boron content, in content of ashes be 5~10 (w/w) %.
It is verified by research of the invention, rich in potassium and compared to the relatively more boron members of other biological matter in ginger stalk
Element, potassium play the role of in activation process promote reaming activation, and boron element prepare it is good played in active carbon process
Place is that the impedance that activated carbon surface wetability can be allowed to be improved between electrolyte and sector electrode reduces, and can produce the counterfeit electricity of faraday
Hold the specific capacitance for effectively improving active carbon, and silicon content is low in ginger stalk, the salt content insoluble in hydrochloric acid is more
It is low, it is easier to pickling.In addition, the present invention chooses electrode material of the ginger stalk as supercapacitor, solves ginger place of production ginger stalk
Difficult multicontaminated problem.
In the preferred embodiment of the present invention, the ginger stalk comes from Shandong Province of China, the new fresh ginger stalk of green in
Harvest season before the Frost's Descent obtains.The ash element of ginger stalk is as shown in table 1.
The ash element content analysis (mass percent %) of 1 ginger stalk of table
In a typical embodiment of the invention, a kind of preparation method of ginger stalk super active carbon is provided, it should
Method the following steps are included:
(1) raw material preparation: choosing ginger stalk, dry after cleaning removal impurity dehydration；
(2) preparation of presoma: the ginger stalk after drying is crushed to powdered；
(3) it carbonizes: powdered ginger stalk is carbonized under inert gas atmosphere；
(4) pickling: the carbide that charing is obtained carries out pickling；
(5) it activates: the carbide after pickling being impregnated in potassium hydroxide solution, is activated after dipping；
(6) it washs drying: the product after activation being subjected to washing and is dried to obtain ginger stalk super active carbon.
In the preferred embodiment of the present invention, in step (1), using press dewatering.
In the preferred embodiment of the present invention, in step (2), crushing mesh number is 60-300 mesh.
Carbonization process influences the formation and development of carbonated material pore structure, to ensure that carbonated material has more gap
Structure, suitable pore-size distribution and specific surface area, the present invention have carried out screening and optimizing to carbonization condition, in currently preferred reality
It applies in mode, in step (3), charing is under nitrogen or argon atmosphere, and charing final temperature is 600-700 DEG C, carbonization time 30-
120min, heating rate are 3-10 DEG C/min.
In the preferred embodiment of the present invention, in step (4), pickling is molten with the hydrochloric acid of 0.1mol/L~6mol/L
Liquid, and a large amount of impurity and ash content therein have been washed away after pickling.
Different activation methods and activation condition can significantly affect active carbon specific surface area and pore structure, for difference
Activated carbon raw material select suitable activation method and activation condition is the key that prepare active carbon.For higher ratio is prepared
The active carbon that surface area and hole appearance etc. are had excellent performance, the present invention has carried out screening and optimizing to activation condition, currently preferred
In embodiment, in step (5), be added potassium hydroxide according to charcoal alkali ratio 1:1.5~1:3, water be completely dissolved according to aqueous slkali and
It is sufficiently impregnated carbide to take the circumstances into consideration to be added, stir the mixture for sticky shape, in 85 DEG C of at a temperature of dipping 2h~6h, and first
For pre-activate to 300-350 DEG C, the pre-activate time is 30-60min, and then activating final temperature is 600-800 DEG C, activation time 90-
240min.Through a large amount of experimental analysis and verifying, 85 DEG C of potassium hydroxide dipping of the invention and low-temperature activation (300-350
DEG C) processing, the carbonate for generating alkali metal keeps hole more flourishing, to prepare the better electrode of super capacitor material of capacitive property
Material provides may.
Charcoal alkali ratio refers to the quality of carbonized product (i.e. charcoal) and the mass ratio of alkali KOH be added in the present invention.
In the preferred embodiment of the present invention, in step (6), using the salt acid elution of 3~6mol/L, reuse from
Sub- water washing is to neutrality.
The equal recoverable of all salinities, such as sylvite in the cleaning solution that the present invention generates during the preparation process.
The ginger stalk that the present invention uses is from a wealth of sources as raw material, cheap, is easy to collect.Ginger stalk itself has
Relatively special eucaryotic cell structure, and have special metallic element and content of heteroatoms.After carbonization-activation of the present invention, it can obtain
To the porous active Carbon Materials with three-dimensional network shape microstructure.This preparation method will be in its biomass by the pickling of hydrochloric acid
Some extra ash contents are taken away, and generate potassium atom in activation process as activator by potassium hydroxide and disappear with carbon-coating
Solution acts on and produces a large amount of micropore and central hole structure.Since ginger stalk itself has relatively high boron content, so that
The ginger straw base porous active carbon surface finally obtained has a large amount of content of heteroatoms (N, P, O, B), can increase such material
Surface wettability, while improving its chemical property.Such absorbent charcoal material raw materials are by this discarded money of ginger stalk
Source is used, and environmental protection is renewable, and such absorbent charcoal material as electrode material for super capacitor with excellent forthright again
Can, and with the increase of quality electric current, the decaying of specific capacitance is slow, can solve commercialization activated carbon for super capacitors material at present
The defect of material has extraordinary application prospect.
In another exemplary embodiment of the invention, the ginger straw base super-active that is prepared using the above method
Charcoal.
In the preferred embodiment of the present invention, the ginger stalk super active carbon is what three-dimensional network shape communicated with one another
Pore structure, specific surface area are 2000~3000 ㎡/g, and quality specific capacitance is 150~380F/g, and with the increase of quality electric current,
Slowly, the specific capacitance attenuation when specific capacitance in 50A/g compares 0.5A/g is lower than 10% for specific capacitance decaying.
The supercapacitor of the present invention specific surface area of ginger stalk super active carbon, pore-size distribution, pore volume can pass through
The temperature and time and impregnating ratio of table charcoal activation are regulated and controled.
In another exemplary embodiment of the invention, the ginger stalk super active carbon is provided in super capacitor
Application in device.
In another exemplary embodiment of the invention, a kind of electrode material for supercapacitor, the electricity are provided
Pole material is prepared using the ginger stalk super active carbon.
To a kind of supercapacitor with excellent high rate performance ginger straw base absorbent charcoal material in the embodiment of the present invention
The test method of performance is as follows:
(1) measurement of specific surface area, pore volume: the measurement using active carbon under the conditions of liquid nitrogen to nitrogen adsorption isotherm,
Specific surface area is calculated according to BET formula.
(2) it the measurement of specific capacitance: is measured under constant current using electrochemical workstation.
In order to enable those skilled in the art can clearly understand technical solution of the present invention, below with reference to tool
The embodiment of the body technical solution that the present invention will be described in detail.
Embodiment 1
A kind of preparation method of the ginger straw base absorbent charcoal material of the supercapacitor with excellent high rate performance, including with
Lower step:
(1) precursor preparation: select ginger stalk as raw material.The new fresh ginger stalk of green is chosen, is cleaned and is cleaned with pure water
It after matter, is placed in squeezer and carries out squeezing processing and slag-liquid separation, it is small that residue is then placed in baking oven at 105 DEG C dry 15
When.Obtained clean ginger stalk pulverizer is crushed into the powder for 200 mesh, is placed in drier stand-by.
(2) it carbonizes: obtained ginger stalk powder being placed in ceramic crucible, nitrogen atmosphere stove is put into, in a nitrogen atmosphere,
With the heating rate of 5 DEG C/min from room temperature to 600 DEG C of final carbonization temperature, and keep 120min.
(3) pickling: obtained carbide is carried out room temperature pickling 3 times with the hydrochloric acid of 6mol/L, is then filtered, obtains
Filter residue.
(4) it activates: obtained acid-leached product being placed in nickel crucible and is impregnated at 85 DEG C with the potassium hydroxide of charcoal alkali ratio 1:3
2h is subsequently placed in nitrogen atmosphere stove, in a nitrogen atmosphere, is first warming up to 350 DEG C of progress pre-activate with 5 DEG C/min, is kept
Then 30min is warming up to 800 DEG C of final activation temperature again with 5 DEG C/min, keep 120min.
(5) washing and drying: after to be activated, temperature is down to room temperature, and gained ginger straw base porous activated carbon is first used salt
Acid elution, is then washed to neutrality with deionized water again, is finally placed in 105 DEG C of baking ovens and sufficiently dries 12h, is placed in dry environment
In.Obtained its specific surface area of ginger straw base super active carbon material is 2600 ㎡/g, total pore volume 1.591cm3/ g, N2Absorption-
Desorption isotherm as shown in Figure 1, pore size distribution range as shown in Fig. 2, the performance test results as seen in figures 3-5, in the electricity of 1A/g
Specific capacitance 225A/g under current density, and with the increase of quality electric current, specific capacitance decaying is slow, the specific capacitance phase in 50A/g
Specific capacitance attenuation when than 0.5A/g is 8.6%.
Embodiment 2
A kind of preparation method of the ginger straw base absorbent charcoal material of the supercapacitor with excellent high rate performance, including with
Lower step:
(1) precursor preparation: select ginger stalk as raw material.The new fresh ginger stalk of green is chosen, is cleaned and is cleaned with pure water
It after matter, is placed in squeezer and carries out squeezing processing and slag-liquid separation, it is small that residue is then placed in baking oven at 105 DEG C dry 15
When.Obtained clean ginger stalk pulverizer is crushed into the powder for 120 mesh, is placed in drier stand-by.
(2) it carbonizes: obtained ginger stalk powder being placed in ceramic crucible, nitrogen atmosphere stove is put into, in a nitrogen atmosphere,
With the heating rate of 10 DEG C/min from room temperature to 700 DEG C of final carbonization temperature, and keep 120min.
(3) pickling: obtained carbide is carried out room temperature pickling 3 times with the hydrochloric acid of 3mol/L, is then filtered, obtains
Filter residue.
(4) it activates: obtained acid-leached product being placed in nickel crucible and is soaked at 85 DEG C with the potassium hydroxide of charcoal alkali ratio 1:1.5
Stain 3h, is subsequently placed in nitrogen atmosphere stove, in a nitrogen atmosphere, is first warming up to 350 DEG C of progress pre-activate with 10 DEG C/min, keeps
Then 30min is warming up to 600 DEG C of final activation temperature again with 5 DEG C/min, keep 120min.
(5) washing and drying: after to be activated, temperature is down to room temperature, and gained ginger straw base porous activated carbon is first used salt
Acid elution, is then washed to neutrality with deionized water again, is finally placed in 105 DEG C of baking ovens and sufficiently dries 12h, is placed in dry environment
In.Obtained its specific surface area of ginger straw base super active carbon material is 2213 ㎡/g, total pore volume 1.435cm3/ g, in 1A/g
Current density under specific capacitance 207F/g and with the increase of quality electric current, specific capacitance decaying slowly, the specific capacitance in 50A/g
Specific capacitance attenuation when compared to 0.5A/g is 9.2%%
Embodiment 3
A kind of preparation method of the ginger straw base absorbent charcoal material of the supercapacitor with excellent high rate performance, including with
Lower step:
(1) precursor preparation: select ginger stalk as raw material.The new fresh ginger stalk of green is chosen, is cleaned and is cleaned with pure water
It after matter, is placed in squeezer and carries out squeezing processing and slag-liquid separation, it is small that residue is then placed in baking oven at 105 DEG C dry 15
When.Obtained clean ginger stalk pulverizer is crushed into the powder for 80 mesh, is placed in drier stand-by.
(2) it carbonizes: obtained ginger stalk powder being placed in ceramic crucible, nitrogen atmosphere stove is put into, in a nitrogen atmosphere,
With the heating rate of 10 DEG C/min from room temperature to 450 DEG C of final carbonization temperature, and keep 120min.
(3) pickling: obtained carbide is carried out room temperature pickling 3 times with the hydrochloric acid of 3mol/L, is then filtered, obtains
Filter residue.
(4) it activates: obtained acid-leached product being placed in nickel crucible and is impregnated at 85 DEG C with the potassium hydroxide of charcoal alkali ratio 1:2
1h is subsequently placed in nitrogen atmosphere stove, in a nitrogen atmosphere, is first warming up to 350 DEG C of progress pre-activate with 3 DEG C/min, is kept
Then 30min is warming up to 700 DEG C of final activation temperature again with 5 DEG C/min, keep 120min.
(5) washing and drying: after to be activated, temperature is down to room temperature, and gained ginger straw base porous activated carbon is first used salt
Acid elution, is then washed to neutrality with deionized water again, is finally placed in 105 DEG C of baking ovens and sufficiently dries 12h, is placed in dry environment
In.Obtained its specific surface area of ginger straw base super active carbon material is 2126 ㎡/g, total pore volume 1.514cm3/ g, in 1A/g
Current density under specific capacitance 196F/g and with the increase of quality electric current, specific capacitance decaying slowly, the specific capacitance in 50A/g
Specific capacitance attenuation when compared to 0.5A/g is 9.1%
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (7)
1. a kind of preparation method of ginger stalk super active carbon, characterized in that method includes the following steps:
(1) raw material preparation: choosing ginger stalk, dry after cleaning removal impurity dehydration；
(2) preparation of presoma: the ginger stalk after drying is crushed to powdered；
(3) it carbonizes: powdered ginger stalk is carbonized under inert gas atmosphere；
(4) pickling: the carbide that charing is obtained carries out pickling；
(5) it activates: the carbide after pickling being impregnated in potassium hydroxide solution, is activated after dipping；
(6) it washs drying: the product after activation being subjected to washing and is dried to obtain ginger stalk super active carbon；
Wherein, in step (3), charing is under nitrogen or argon atmosphere, and charing final temperature is 600-700 DEG C, carbonization time 30-
120min, heating rate are 3-10 DEG C/min；
In step (4), pickling is the hydrochloric acid solution of 0.1mol/L~6mol/L；
In step (5), with the potassium hydroxide of charcoal alkali ratio 1:1.5~1:3,85 DEG C at a temperature of impregnate 2h~6h, and first pre- work
Change to 300-350 DEG C, the pre-activate time is 30-60min, and then activating final temperature is 600-800 DEG C, activation time 90-
240min。
2. preparation method as described in claim 1, it is characterized in that: in step (1), using press dewatering；In step (2), powder
Broken mesh number is 60-300 mesh.
3. preparation method as described in claim 1, it is characterized in that:
In step (6), using the salt acid elution of 3~6mol/L, reuses deionized water and wash to neutrality.
4. the ginger stalk super active carbon being prepared using method of any of claims 1-3.
5. ginger stalk super active carbon as claimed in claim 4, it is characterized in that: the ginger stalk super active carbon is three
The network-like pore structure to communicate with one another is tieed up, specific surface area is 2000~3000m2/ g, quality specific capacitance are 150~380F/g, and
With the increase of quality electric current, slowly, the specific capacitance in 50A/g compares specific capacitance attenuation when 0.5A/g for specific capacitance decaying
Lower than 10%.
6. application of the ginger stalk super active carbon described in claim 4 or 5 in supercapacitor.
7. a kind of electrode material for supercapacitor, it is characterized in that: the electrode material is using described in claim 4 or 5
Ginger stalk super active carbon be prepared.
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| CN109231202B (en) * | 2018-12-05 | 2020-10-23 | 重庆文理学院 | Ginger straw-based nano porous carbon and preparation method thereof |
| CN110203926B (en) * | 2019-07-04 | 2021-04-13 | 山东大学 | Method for comprehensively utilizing ginger straws |
| CN112194130A (en) * | 2019-07-08 | 2021-01-08 | 宁波杉杉新材料科技有限公司 | Biomass activated carbon, electrode, preparation method and application thereof |
| WO2021131907A1 (en) * | 2019-12-25 | 2021-07-01 | 株式会社クラレ | Carbonaceous material, method for producing same, electrode active material for electric double layer capacitors, electrode for electric double layer capacitors, and electric double layer capacitor |
| CN111634908B (en) * | 2020-04-22 | 2022-03-01 | 山东大学 | Method for preparing porous carbon by nitrogen and oxygen co-doping porous carbon and L-lysine and application |
| CN111591987A (en) * | 2020-06-12 | 2020-08-28 | 西藏大学 | Activated carbon prepared from highland barley straws and preparation method thereof |
| CN113511654B (en) * | 2021-04-16 | 2022-11-15 | 中国科学院山西煤炭化学研究所 | Capacitance carbon and preparation method thereof |
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