CN106601490A - Preparation method of biomass-based nitrogenous porous carbon, porous carbon prepared by method and use thereof - Google Patents
Preparation method of biomass-based nitrogenous porous carbon, porous carbon prepared by method and use thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/24—Electrodes characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/44—Raw materials therefor, e.g. resins or coal
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- 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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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
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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 preparation method of biomass-based nitrogenous porous carbon, the porous carbon prepared by the method and the use of the prepared nitrogenous porous carbon in a super capacitor. The preparation method comprises the steps of (1) drying a biomass material, and grinding the biomass material into fine powders, (2) evenly mixing the biomass material powders and water or a dilute acid solution, (3) placing the above mixture into a reactor for hydrothermal reaction, and (4) drying and grinding an obtained hydrothermal reaction product, and calcining the hydrothermal reaction product in a tube furnace to obtain a nitrogen-doped porous carbon material with a large surface area. According to the method of the invention, cheap and renewable plant is used as carbon and nitrogen precursors, and the porous nitrogen-doped carbon material is prepared through a hydrothermal method. The method has the advantages of simple preparation process, no need of an activator or template agent, low cost, environmental protection, and convenient operation, problems of strong corrosion, a high price of transition metal and environmental pollution caused by heavy metal are avoided, and the method is suitable for mass production.
Description
Technical field
The invention belongs to field of inorganic nano material, and in particular to it is a kind of for ultracapacitor based on biomass material
Nitrogen-doped porous carbon material.
Background technology
Ultracapacitor is a kind of environmental protection energy storage device, with power density it is high, the discharge and recharge time is short, cycle life
The advantages of long and operating temperature range width, there is important application valency in fields such as transportation, electronic product and wind-powered electricity generation storages
Value.At present, the key issue for limiting supercapacitor applications is that the energy density of ultracapacitor is low, business-like super electricity
Container energy storage density is only 5～10Wh/kg, far below 120～170Wh/kg of lithium ion battery.According to super capacitor energy
Density formulaUnderstand, super capacitor energy can be improved by raising specific capacitance (C) and voltage window (V) close
Degree, and specific capacitance then depends primarily on the performance of electrode material.Therefore, improve it is critical only that for ultracapacitor combination property to seek
Look for high performance electrode material.
Porous carbon materials due to specific surface area height, stable chemical performance, have extended cycle life, and raw material sources extensively, price
Cheap is the most widely used electrode material in ultracapacitor field.The shape characteristic of material with carbon element, surface chemistry and micro structure (such as than
Surface area, pore-size distribution, hole and crystal defect) there is tremendous influence to its chemical property.Carbon with activated carbon as representative
Material contains substantial amounts of micropore, it is difficult to form electric double layer, and surface utilisation is not high so as to affecting power density.With CNT it is
The new carbon of representative has excellent high rate performance, but its specific surface area is typically only 100～400m2/ g, therefore electric capacity
Amount is relatively low and manufacturing cost is expensive.The problems such as meso-porous carbon material there is also not high specific surface area, complicated process of preparation, it is difficult to work
Industry metaplasia is produced.On the whole, capacitance of the common material with carbon element in inorganic electrolyte liquid is generally in 150～300F/g or so
[Nature Mater.2008,7,845], its energy density cannot also meet the demand of its practical application.And how to optimize carbon materials
The various structural parameters of material, obtain excellent chemical property, become difficult point that the porous carbon for ultracapacitor studies and
Focus.
Except optimum structural parameter, in porous carbon materials, introducing hetero-atoms are that of the specific capacitance for improving material with carbon element has
Effect approach.Given due to the electronics that Heteroatom doping can change the graphite linings of material with carbon element/receive performance, can in charge and discharge process
Generation faraday's reaction, so as to produce pseudo-capacitance.Additionally, the functional group that surface hetero atom is formed can also improve the hydrophilic of material with carbon element
Property, it is easy to the infiltration of electrolyte ion, so as to be also beneficial to improve capacitance.There are some researches show
[Electrochem.Commun.2008,10,795], the nitrogen-atoms that adulterate in material with carbon element can produce significant pseudo-capacitance, make porous
The quality specific capacitance of carbon is greatly improved, and its structural stability is good, therefore the porous nitrogen-doped carbon material of bigger serface is expected to
Become a kind of ideal electrode material of very promising high-capacity super capacitor.In recent years, as biological material distribution is wide
It is general, with natural micropore, mesoporous and macroporous structure and rich in various elements the features such as, with biomass as raw material prepare it is new
Type material with carbon element causes extensive concern in the application aspect of ultracapacitor.And conventional preparation method is mainly with chemical activation
Based on method, it is numerous and diverse to there is synthesis technique, cost intensive, need to chemical reagent such as substantial amounts of strong acid, highly basic the problems such as.Therefore,
With cheap reproducible biomass as raw material, a kind of inexpensive, eco-friendly multiporous biological matter base N doping carbon materials of exploitation
Material has great importance.
The content of the invention
For above-mentioned the problems of the prior art, it is an object of the present invention to provide a kind of simple, green ring
Guarantor, the preparation method based on biomass-based nitrogenous porous carbon with low cost, the preparation method comprise the steps：
1) biological material is dried, grinds to form fine powder；
2) a certain amount of biological material powder is added in suitable quantity of water or mix homogeneously, life in the dilute acid soln of low concentration
Material is 1 with the mass ratio of water or dilute acid soln:3 to 1:30, preferably 1:5 to 1:20；
3) by step 2) in the mixture that obtains be transferred in reactor, be heated to 100～300 under hydrothermal reaction condition
DEG C, preferably 150～250 DEG C, 1～72 hour being incubated, selected 3～48 hours, cooling, washing obtain brown solid；
4) by step 3) in the solid that obtains be dried, grind, then calcined in tube furnace, in noble gases
In 300～1500 DEG C of scope inside holdings 0.5～100 hour in atmosphere；Sample is taken out after tube furnace drops to room temperature, that is, obtained
The nitrogen-doped porous carbon material of bigger serface.
Wherein, in step 1) described in biological material be rich protein-contg plant, comprising sweet potato leaf, Ulmus pumila L., Herba Taraxaci
At least one in leaf, Hemerocallis citrina Baroni Seedling leaf, Folium corchori, Herba Arctii leaf, Germinatus Phragmitiss, bamboo sprout, Herba Cleomis, Herba Spinaciae, Caulis et Folium Brassicae capitatae, preferably spinach
At least one in dish, bamboo sprout, which is simultaneously as carbon source and nitrogen source.
Preferably, in step 2) described in the diluted acid of low concentration can be sulphuric acid, hydrochloric acid, nitric acid, formic acid, acetic acid or phosphoric acid
In at least one, preferably sulfuric acid or acetic acid, the weight percent concentration of acid is 0.1～50%, preferably 0.5～10%.
In step 4) described in calcining heat be 300～1500 DEG C, preferably 500～1000 DEG C, the noble gases be nitrogen
One or more in gas, argon and helium, temperature retention time are preferably 1～24 hour.
Preferably, other reactants, such as activator or other nitrogen source materials are not adopted in preparation in accordance with the present invention
Material etc., only with biological material.
Preparation method according to the present invention, the preparation method comprise the steps：
The bamboo sprout for cleaning up are cut into pieces, 70 DEG C are heated to drying in an oven, obtain solid and smash.Take 2g
During powder adds percentage by weight to be 0.5% 20mL dilute sulfuric acids, move on to after being uniformly mixed in hydrothermal reaction kettle, in 210
DEG C reaction 12 hours, filter, washing, be dried to obtain brown solid.Afterwards the drying solid for obtaining is put in tube furnace in nitrogen
Calcine in gas atmosphere, in 800 DEG C of scope inside holdings 8 hours.Sample is taken out after tube furnace drops to room temperature, that is, obtain nitrogen
Doped porous carbon material, its nitrogen content are about 2.9%, and its specific surface area is 1893m2/g。
According to another aspect of the present invention, the invention provides a kind of be based on biomass-based nitrogenous porous carbon materials, institute
State and prepared by preparation method according to the present invention based on biomass-based nitrogenous porous carbon materials, should be based on biomass-based
The specific surface area of nitrogenous porous carbon materials is 500～2500m2/ g, nitrogen content are 0.5～10at%.
According to another aspect of the present invention, the invention provides described based on biomass-based nitrogenous porous carbon materials conduct
The purposes of electrode material for super capacitor.
Beneficial effect
The present invention has following advantage compared with prior art：
1st, using cheap, reproducible plant be carbon and nitrogen precursor by hydro-thermal method preparing porous nitrogen-doped carbon material.
All raw materials are Renewable resource, and widely distributed, environmental protection, simple and easy to get, aboundresources are cheap.
2nd, the porous carbon materials of bigger serface are prepared generally using physical/chemical activation method or template.This
The hydro-thermal method of bright employing environmental protection is synthesizing the nitrogen-doped carbon material with bigger serface, abundant pore structure.The method
Preparation process is simple, without the need for any activator or template, with low cost, environmental friendliness is easy to operate, it is to avoid corrosivity
By force, the problems such as transition metal price is high, heavy metal brings environmental pollution, is adapted to large-scale production.
3rd, the of the invention nitrogen-doped porous carbon material is used for electrode material for super capacitor, shows high thermally-stabilised
Property, high specific capacitance, high rate capability and good cyclical stability, 5000 specific capacitance conservation rates of circulation are up to more than 98%.
The present invention is capable of achieving the regulation of the specific surface area, pore-size distribution and nitrogen content of material with carbon element by regulation reaction condition, carburizing temperature,
There is provided a kind of specific capacitance height and the excellent electrode material of cycle performance.
Description of the drawings
Fig. 1 is the BET result figures of the nitrogen-doped porous carbon material prepared according to embodiments of the invention 1.
Fig. 2 is the SEM figures of the nitrogen-doped porous carbon material prepared according to embodiments of the invention 1.
Fig. 3 is circulation of the nitrogen-doped porous carbon material under different scanning rates prepared according to embodiments of the invention 1
Voltammetric scan curve chart.
Fig. 4 is permanent electric under different electric current densities according to the nitrogen-doped porous carbon material of the preparation of embodiments of the invention 1
Stream charging and discharging curve figure.
Fig. 5 be according to embodiments of the invention 1 prepare nitrogen-doped porous carbon material under different electric current densities ratio electricity
Hold curve.
Fig. 6 is the cyclical stability test of the nitrogen-doped porous carbon material prepared according to embodiments of the invention 1.
Specific embodiment
Hereinafter, will be described in detail the present invention.Before doing so, it should be appreciated that in this specification and appended
Claims used in term should not be construed as and be limited to general sense and dictionary meanings, and inventor should allowed
It is appropriate define term to carry out the principle of best interpretations on the basis of, according to implication corresponding with the technical elements of the present invention and generally
Thought is explained.Therefore, description presented herein is not intended to limit this merely for the sake of the preferred embodiment for illustrating purpose
The scope of invention, it will thus be appreciated that in the case of without departing from the spirit and scope of the present invention, which can be obtained by which
His equivalents or improved procedure.
The preparation method of nitrogen-doped porous carbon material of the invention is hydro-thermal method, by the porous nitrogen of the method synthesis
Doping material with carbon element has big specific surface area, abundant micro- meso-hole structure.The method with reproducible rich in protein biology matter is
Raw material, need not add nitrogen source, and one-step method original position prepares the porous carbon materials of N doping, and the porous nitrogenous material have it is excellent
Electric double layer capacitance performance and good cyclical stability.
Using alkali as activator in the chemical activation method of prior art, but in order that final activated carbon product has foot
Enough micropores or meso-hole structure, generally require using substantial amounts of alkali as activator, and the activator is usual one times, or even several times
In the amount of biomass material.Comparatively speaking, the present invention need not adopt substantial amounts of activator using hydro-thermal method process, final to produce
Activator component will not be remained in thing.
In preparation in accordance with the present invention, promotion water is played in the acid in nitrogen-doped porous carbon material forming process
The effect of solution.When without acid, its material with carbon element specific surface area may be up to 935m2/ g, with other activation methods or template legal system
Standby material with carbon element specific surface area is suitable；When diluted acid promotion hydrolysis is added, and its material specific surface area is up to 2000m2/ g or so,
Illustrate that appropriate acid not only contributes to promote lignocellulose hydrolysis, and be also beneficial to the formation in hole；And when sour consumption is excessive,
Such as acid is more than 10 with the mass ratio of biomass material, and carbon yield obtained by hydro-thermal declines, and specific surface area is reduced.
In addition, in preparation in accordance with the present invention, by the controllable institute of calcining heat of the adjustment in noble gases
The nitrogen-doping content in material with carbon element is obtained, with the rising of calcining heat, nitrogen content is in downward trend.When calcining heat height
When 1000 DEG C, in material with carbon element, nitrogen content is less than 1.0at%；When calcining heat is less than 300 DEG C, the volatilization in biological material
Point can not remove completely, the physicochemical property of gained material with carbon element can not reach uniform and stable.
The specific surface area 500 of the final nitrogen-doped porous carbon material that preparation in accordance with the present invention is obtained～
2500m2/ g, nitrogen content are 0.5～10at%.And by biomass material, directly under inert gas shielding high temperature pyrolysis are obtained
The specific surface area of nitrogen-doped carbon material is less, generally less than 50m2/g。
Following examples are enumerated only as the example of embodiment of the present invention, do not constitute any limit to the present invention
System, it will be appreciated by those skilled in the art that the modification in the range of the essence without departing from the present invention and design each falls within the present invention
Protection domain.
Embodiment 1
The bamboo sprout that 1kg is cleaned up are cut into pieces, 70 DEG C are heated to drying in an oven, obtain solid and smash.
Take 2g powder to add during percentage by weight is 0.5% 20mL dilute sulfuric acids, move on to after being uniformly mixed in hydrothermal reaction kettle, in
210 DEG C are reacted 12 hours, filtered, are washed, are dried to obtain brown solid.Afterwards the drying solid for obtaining is put in tube furnace
Calcine in nitrogen gas atmosphere, in 800 DEG C of scope inside holdings 8 hours.Sample is taken out after tube furnace drops to room temperature, that is, obtain
Nitrogen-doped porous carbon material, nitrogen content are about 2.9%, and its specific surface area is 1893m2/g.Fig. 1 and Fig. 2 are according to the present embodiment
BET the and SEM result figures of the nitrogen-doped porous carbon material of preparation, as shown in Fig. 1 and Fig. 2 data, the material contains the micro- of prosperity
Hole and mesoporous hierarchical porous structure.
Embodiment 2
The bamboo sprout that 1kg is cleaned up are cut into pieces, 70 DEG C are heated to drying in an oven, obtain solid and smash.
Take 2g powder to add in 20mL water (the not situation of acid adding), move on to after being uniformly mixed in hydrothermal reaction kettle, react in 210 DEG C
12 hours, filter, wash, be dried to obtain brown solid.Afterwards the drying solid for obtaining is put in tube furnace in nitrogen gas
Calcine in atmosphere, in 900 DEG C of scope inside holdings 8 hours.Sample is taken out after tube furnace drops to room temperature, that is, obtain N doping many
Hole material with carbon element, its specific surface area are 935m2/ g, nitrogen content are 1.7%.
Embodiment 3
The Herba Spinaciae that 1kg is cleaned up is cut into pieces, 70 DEG C are heated to drying in an oven, obtain solid and smash.
Take 2g powder to add during percentage by weight is 1.0% 20mL spirit of vinegar water, move on to after being uniformly mixed in hydrothermal reaction kettle,
React 8 hours in 180 DEG C, filter, wash, be dried to obtain brown solid.Afterwards the drying solid for obtaining is put in tube furnace
Calcine in nitrogen gas atmosphere, in 700 DEG C of scope inside holdings 6 hours.Sample is taken out after tube furnace drops to room temperature, obtain final product
To nitrogen-doped porous carbon material, its specific surface area is 680m2/ g, nitrogen content are 3.2%.
Comparative example 1
The bamboo sprout that 1kg is cleaned up are cut into pieces, 70 DEG C are heated to drying in an oven, obtain solid and smash.
Take 2g powder and be put in tube furnace and calcine in nitrogen gas atmosphere, in 800 DEG C of scope inside holdings 8 hours.Treat that tube furnace is dropped to
Sample is taken out after room temperature, impurity, drying to obtain nitrogen-doped porous carbon material are cleaned with water, its specific surface area is 48m2/ g,
Nitrogen content is 2.8%.
EXPERIMENTAL EXAMPLE：
Nitrogen-doped porous carbon material to preparing in above-described embodiment 1 carries out electrochemical property test.Specific operation process
For：By material with carbon element：Acetylene black：Kynoar (PVDF) is with weight ratio as 80：10：10 ratio mix homogeneously, add a small amount of N-
Methyl pyrrolidone, said mixture is uniformly applied to after stirring nickel foam 1cm2Surface on, at 70 DEG C vacuum do
Dry to constant weight in dry case and weigh.Prepared electrode material is placed in 6mol/L KOH electrolyte, is right with platinum electrode
Electrode, saturated calomel electrode are reference electrode, carry out electrochemical property test using three electrode test methods.As a result show：
Cyclic voltammetry curve (see Fig. 3) of the nitrogen-doped porous carbon material obtained according to embodiment 1 in the case where difference sweeps speed, should
Electrode material keeps nearly rectangular shape during sweep speed is increased from 5mV/s to 100mV/s, illustrates that the material has excellent
Different charge-discharge performance.Fig. 4 is constant current charge-discharge curve of the electrode material under different charging or discharging current density, is further characterized by
The material has high electric capacity and an excellent high rate performance.When electric current density is 1A/g, its electric discharge specific capacitance is up to 626F/g,
Capacitance (150～300F/g) far above material with carbon element generally in inorganic electrolyte liquid.As shown in figure 5, with electric current density from
1A/g increases to 10A/g, and its specific capacitance can keep 522F/g, shows the good multiplying power property of the material.This is likely due to
The material is not only containing abundant micropore energy storage, and the passage containing flourishing mesopore offer ion fast transferring, so that carbon
Electrode has high specific capacitance and good high-rate performance concurrently.When the electrode material is Jing after circulation 5000 times, still have more than
98.5% capacity retention (see Fig. 6).
When under similarity condition, electric current density is 5A/g, test is obtained according to embodiment 2, embodiment 3 and comparative example 1 respectively
To the electric discharge specific capacitance of nitrogen-doped porous carbon material be respectively 450F/g, 312F/g and 92F/g.Can be seen by data above
Go out, the nitrogen-doped porous carbon material that preparation in accordance with the present invention is obtained is compared to the product electrification processed without hydro-thermal method
Can be more preferably.
Claims (10)
1. a kind of preparation method based on biomass-based nitrogenous porous carbon, the preparation method comprise the steps：
1) biological material is dried, grinds to form fine powder；
2) by the biological material powder for obtaining add suitable quantity of water in or the dilute acid soln of low concentration in mix homogeneously, biomass with
The mass ratio of water or dilute acid soln is 1:3 to 1:30, preferably 1:5 to 1:20；
3) by step 2) in the mixture that obtains be transferred in reactor, 100～300 DEG C are heated under hydrothermal reaction condition,
It is preferred that 150～250 DEG C, 1～72 hour being incubated, is selected 3～48 hours, cooling, washing obtain brown solid；
4) by step 3) in the solid that obtains be dried, grind, then calcined in tube furnace, in atmosphere of inert gases
In in 300～1500 DEG C of scope inside holdings 0.5～100 hour；Sample is taken out after tube furnace drops to room temperature, i.e., compared greatly
The nitrogen-doped porous carbon material of surface area.
2. the preparation method based on biomass-based nitrogenous porous carbon according to claim 1, it is characterised in that in step 1)
Described in biological material be rich protein-contg plant, including sweet potato leaf, Ulmus pumila L., Folium Taraxacum, Hemerocallis citrina Baroni Seedling leaf, Folium corchori, cattle
At least one in burdock leaf, Germinatus Phragmitiss, bamboo sprout, Herba Cleomis, Herba Spinaciae, Caulis et Folium Brassicae capitatae, which is simultaneously as carbon source and nitrogen source.
3. the preparation method based on biomass-based nitrogenous porous carbon according to claim 1, it is characterised in that in step 1)
Described in biological material be Herba Spinaciae, at least one in bamboo sprout.
4. the preparation method based on biomass-based nitrogenous porous carbon according to claim 1, it is characterised in that in step 2)
Described in low concentration diluted acid be sulphuric acid, hydrochloric acid, nitric acid, formic acid, acetic acid or phosphoric acid at least one, acid percentage by weight
Concentration is 0.1～50%, preferably 0.5～10%.
5. the preparation method based on biomass-based nitrogenous porous carbon according to claim 1, it is characterised in that in step 2)
Described in the diluted acid of low concentration be sulphuric acid or acetic acid.
6. the preparation method based on biomass-based nitrogenous porous carbon according to claim 1, it is characterised in that in step 4)
Described in calcining heat be 300～1500 DEG C, preferably 500～1000 DEG C, the noble gases be nitrogen, argon and helium in
One or more, temperature retention time is preferably 1～24 hour.
7. the preparation method based on biomass-based nitrogenous porous carbon according to claim 1, it is characterised in that the preparation
Other reactants are not adopted in method, such as activator or other nitrogen source materials etc., only with biological material.
8. a kind of preparation method based on biomass-based nitrogenous porous carbon, the preparation method comprise the steps：
The bamboo sprout for cleaning up are cut into pieces, 70 DEG C are heated to drying in an oven, obtain solid and smash.Take 2g powder
In adding percentage by weight to be 0.5% 20mL dilute sulfuric acids, move on to after being uniformly mixed in hydrothermal reaction kettle, it is anti-in 210 DEG C
Answer 12 hours, filter, wash, be dried to obtain brown solid.Afterwards the drying solid for obtaining is put in tube furnace in nitrogen gas
Calcine in body atmosphere, in 800 DEG C of scope inside holdings 8 hours.Sample is taken out after tube furnace drops to room temperature, that is, obtain N doping
Porous carbon materials, its nitrogen content are about 2.9%, and its specific surface area is 1893m2/g。
9. it is a kind of to be based on biomass-based nitrogenous porous carbon, it is described based on biomass-based nitrogenous porous carbon by according to claim 1 to 8
Preparation method described in middle any one is prepared, should specific surface area based on biomass-based nitrogenous porous carbon be 500～
2500m2/ g, nitrogen content are 0.5～10at%.
10. it is according to claim 9 based on biomass-based nitrogenous porous carbon as electrode material for super capacitor purposes.
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