CN107689445A - The preparation method of biomass porous carbon and carbon sulphur composite based on bracteal leaf of corn - Google Patents

The preparation method of biomass porous carbon and carbon sulphur composite based on bracteal leaf of corn Download PDF

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Publication number
CN107689445A
CN107689445A CN201710641106.3A CN201710641106A CN107689445A CN 107689445 A CN107689445 A CN 107689445A CN 201710641106 A CN201710641106 A CN 201710641106A CN 107689445 A CN107689445 A CN 107689445A
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porous carbon
corn
bracteal leaf
biomass
preparation
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Inventor
燕映霖
李巧乐
魏奇
魏一奇
史忙忙
杨蓉
许云华
陈利萍
秦海超
任冰
樊潮江
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Xian University of Technology
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Xian University of Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/364—Composites as mixtures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses a kind of preparation method of biomass porous carbon and carbon the sulphur composite based on bracteal leaf of corn, using the cheap bracteal leaf of corn biomass of cost as material, first with cleaning fluid by its washes clean, then activation process is carried out with potassium hydroxide again, be placed on afterwards in retort carry out be incubated carbonization obtain porous carbon, by the way that porous carbon and sulphur are mixed according to certain mass ratio, then it is milled to powdery, finally more carbon pores are placed in vacuum drying oven with pulverulent mixture that sulphur forms carry out it is compound, obtain porous carbon sulphur composite, its preparation method is relatively easy, greatly reduce the preparation cost of porous carbon and porous carbon sulphur composite.

Description

The preparation method of biomass porous carbon and carbon sulphur composite based on bracteal leaf of corn
Technical field
The invention belongs to technical field of material, and in particular to prepared by a kind of biomass porous carbon based on bracteal leaf of corn Method, the invention further relates to a kind of biomass porous carbon sulphur composite preparation process based on bracteal leaf of corn.
Background technology
Lithium-sulfur cell has the theoretical specific capacity (1675mAhg of superelevation-1), it is its inexpensive, safe, it is one The secondary cell system that kind has a extensive future.But lithium-sulfur cell elemental sulfur positive electrode is insulating materials (conductance under normal temperature Rate is 5 × 10-30S·cm-1), the intermediate product long-chain lithium polysulphides (Li in charge and discharge process2Sn, 4≤n≤8) it is readily dissolved in In electrolyte, shuttle effect occurs between sulphur positive pole and cathode of lithium, and react with cathode of lithium and formed absolutely in electrode surface Edge and undissolved Li2S2/Li2S deposit, so as to prevent the transmission of electronics and ion, cause its active material utilization Relatively low and capacity attenuation is fast, significantly reduces its actual application value.
For problem above, researcher from the exploitation of electrolyte, the change or modification of negative pole, positive pole it is compound etc. Extensive work is carried out.Wherein elemental sulfur and conductive carbon material are important sides that lithium-sulfur cell is studied as composite positive pole To, and porous carbon materials can have not only with good electric conductivity but also with substantial amounts of pore structure and larger specific surface area Effect improves current-carrying capacity and battery capacity.The larger pore volume of other porous carbon can be ensured with the bulk strain during buffer cycles Stable electrode structure and excellent cycle performance.
The biosystem resources bank huge as one, abundant porous carbon raw material can be provided for lithium-sulfur cell, China Patent application, application publication number CN105742609A, disclose a kind of " water silk floss based biomass carbon material/nano-sulfur composite wood The preparation method of material ", this method can prepare the superior carbon sulphur composite of electric property using water silk floss as material.But should Method is with other biological matter, and especially material is in itself much worse than water silk floss, the electricity of its carbon sulphur composite prepared Performance is often not ideal.
The content of the invention
It is an object of the invention to provide a kind of biomass porous carbon preparation method based on bracteal leaf of corn, can utilize corn bud Leaf biomass prepares the preferable porous carbon of electric property.
It is a further object to provide a kind of biomass porous carbon preparation method based on bracteal leaf of corn, can utilize Bracteal leaf of corn biomass prepares the preferable porous carbon sulphur composite of electric property, solves the Complex Problem of porous carbon and sulphur.
The first technical scheme of the present invention is：A kind of biomass porous carbon preparation side based on bracteal leaf of corn Method, specifically implement according to following steps：
Step 1, bracteal leaf of corn is washed with cleaning fluid, until cleaning fluid is clarified；
Step 2, the bracteal leaf of corn obtained through step 1 is placed in vacuum drying chamber and dried；
Step 3, the bracteal leaf of corn obtained through step 2 is put into the carbide furnace full of inert gas, carbide furnace is first with 2 DEG C -12 DEG C/min heating rate rises to 300 DEG C -900 DEG C, then carries out 3-5h carbonization insulation at this temperature, afterwards charcoal Change stove is cooled to room temperature and obtains biomass carbon；
Step 4, by the biomass carbon through being obtained in step 3 and potassium hydroxide according to 1：1-4 mass ratio mixing, Ran Houjia Enter stirring in deionized water and form mixed liquor, be evaporated to form sticky mass by mixed liquor at a constant temperature afterwards；
Step 5, sticky mass will be obtained through step 4 it will be put into baking oven to dry, will place into afterwards full of inert gas In carbide furnace, carbide furnace first rises to 300 DEG C -900 DEG C with 2 DEG C -12 DEG C/min heating rate, then carries out at this temperature 3h-5h carbonization insulation, retort is cooled to room temperature and obtains porous carbon afterwards.
The characteristics of the first technical scheme of the invention, also resides in：
In the step 1：Cleaning fluid used is ethanol and deionized water.
In the step 1：The ethanol and deionized water carry out repeatedly alternately cleaning to bracteal leaf of corn.
In the step 2：The temperature that vacuum drying chamber is dried is 50 DEG C.
In the step 3：The inert gas is nitrogen or argon gas.
In the step 4：Described constant temperature is 80 DEG C.
Used second of technical scheme of the present invention is that a kind of biomass porous carbon sulphur based on bracteal leaf of corn is compound Material preparation method, specifically follow the steps below：
Step 1, it is 2-4 according to mass ratio：1 weighs sulphur, the porous carbon respectively, and the sulphur weighed and porous carbon are mixed simultaneously It is added in ball mill, sulphur is well mixed with porous carbon by the ball action of ball mill, forms mixed powder；
Step 2, mixed powder step 1 obtained is put into baking oven, and 10h-12h, Ran Houleng are incubated at 155 DEG C -158 DEG C But porous carbon sulphur composite is obtained to room temperature.
The beneficial effects of the invention are as follows：(1) the biomass porous carbon preparation method of the invention based on bracteal leaf of corn, with cost Cheap bracteal leaf of corn biomass is material, is first then carried out its washes clean at activation with potassium hydroxide again with cleaning fluid Reason, be finally placed in retort carry out be incubated carbonization obtain porous carbon, its preparation method is relatively easy, and cost is also low；(2) this hair The bright biomass porous carbon sulphur composite material and preparation method thereof based on bracteal leaf of corn, by by porous carbon and sulphur according to certain quality Than mixing, be then milled to powdery, finally more carbon pores are placed in vacuum drying oven with pulverulent mixture that sulphur forms carry out it is compound, Porous carbon sulphur composite is obtained, greatly reduces the preparation cost of porous carbon sulphur composite.
Brief description of the drawings
Fig. 1 is the transmission electron microscope picture for the porous carbon prepared using the porous carbon preparation method of the present invention；
Fig. 2 is the adsorption isothermal curve figure prepared using the porous carbon preparation method of the present invention；
Fig. 3 is the graph of pore diameter distribution for the porous carbon prepared using the porous carbon preparation method of the present invention；
Fig. 4 is porous carbon, the X-ray diffraction of porous carbon sulphur composite prepared using the preparation method of the present invention Figure；
Fig. 5 is that the porous carbon sulphur composite that the preparation method by the use of the present invention is made out uses as lithium battery anode When cycle life curve under 0.1C (multiplying power).
Embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
Biomass porous carbon preparation method of the invention based on bracteal leaf of corn, specifically implements according to following steps：
Step 1, bracteal leaf of corn is carried out repeatedly alternately to clean with ethanol and deionized water, until cleaning fluid is clarified；
Step 2, the bracteal leaf of corn obtained through step 1 is placed in 50 DEG C of vacuum drying chamber and dried；
Step 3, bracteal leaf of corn step 2 obtained is put into the carbide furnace full of nitrogen or argon gas, and carbide furnace is first with 2 DEG C -12 DEG C/min heating rate rises to 300 DEG C -900 DEG C, then carries out 3h-5h carbonization insulation at this temperature, afterwards charcoal Change stove is cooled to room temperature and obtains biomass carbon；
Step 4, by the biomass carbon obtained in step 3 and potassium hydroxide according to 1：1-4 mass ratio mixing, is then added Stirring forms mixed liquor in deionized water, is evaporated to form sticky mass by mixed liquor in 80 DEG C of water-bath afterwards；
Step 5, sticky mass will be obtained through step 4 it will be put into baking oven to dry, will place into afterwards full of nitrogen or argon gas Carbide furnace in, carbide furnace first with 2 DEG C -12 DEG C/min heating rate rises to 300 DEG C -900 DEG C, then carries out at this temperature 3h-5h carbonization insulation, retort is cooled to room temperature and obtains porous carbon afterwards
Biomass porous carbon sulphur composite material and preparation method thereof of the invention based on bracteal leaf of corn, implements according to following steps:
Step 1, by sulphur and by porous carbon made from the above method, according to 2-4:1 mass ratio mixes and loads ball milling In machine, sulphur is well mixed with porous carbon by ball action, form mixed powder；
Step 2, the mixed powder obtained through step 1 is placed in baking oven, 10h-12h is incubated at 155 DEG C -158 DEG C, so After be cooled to room temperature and obtain porous carbon sulphur composite.
As shown in figure 1, the porous carbon prepared using the porous carbon preparation method of the present invention has the piece of class graphene-like Rotating fields, there is the fold and pore space structure of thin-walled.
As shown in Fig. 2 obvious IV types isothermal is presented in the porous carbon prepared using the porous carbon preparation method of the present invention Adsorption curve, there are longer isothermal adsorption platform, the hysteresis loop of closure, and show typical mesoporous adsorpting characteristic.
As shown in figure 3, the porous carbon prepared using the porous carbon preparation method of the present invention shows hole of different sizes Footpath is distributed, and average pore size 3.069nm, total pore volume 0.808cm3/g, its specific surface area are up to 1824m2/g.Aperture is less than 10nm hole accounts for 84.52%, and aperture accounts for 11.12% in 10nm to 50nm hole, and aperture accounts for 4.37% in more than 50nm hole.This Abundant multi-stage porous can show extremely strong advantage in terms of adsorption activity material a bit, contribute to electrolyte quickly to infiltrate, and realize The travel at high speeds of electronic and ionic bilateral, is obviously improved chemical property.
As shown in figure 4, uppermost curve represents sulphur, middle curve represents the porous carbon preparation method using the present invention The porous carbon prepared, nethermost curve expression are prepared more using the porous carbon sulphur composite material and preparation method thereof of the present invention Hole carbon sulphur composite, porous carbon and sulphur it is compound after, the Partial Feature peak of sulphur is disappeared in porous sulphur carbon composite, illustrates sulphur It has been dispersed in porous carbon.
As shown in figure 5, curve above represents cycle efficieny, curve below represents discharge capacity.Porous carbon sulphur is compound Material as lithium-sulfur cell positive pole in use, cycle efficieny is close to 100% under 0.1C multiplying power, discharge capacity can first for it 1205mAh/g is kept, remains to keep 662mAh/g after 80 circulations.
Embodiment 1
Biomass porous carbon preparation method of the invention based on bracteal leaf of corn, specifically implements according to following steps：
Step 1, bracteal leaf of corn is carried out repeatedly alternately to clean with ethanol and deionized water, until cleaning fluid is clarified；
Step 2, the bracteal leaf of corn obtained through step 1 is placed in 50 DEG C of vacuum drying chamber and dried；
Step 3, bracteal leaf of corn step 2 obtained is put into the carbide furnace full of nitrogen or argon gas, and carbide furnace is first with 2 DEG C/min heating rate rises to 300 DEG C, 3h carbonization insulation is then carried out at this temperature, and retort is cooled to room temperature afterwards Obtain biomass carbon；
Step 4, by the biomass carbon obtained in step 3 and potassium hydroxide according to 1：1 mass ratio mixing, then adds and goes Stirring forms mixed liquor in ionized water, is evaporated to form sticky mass by mixed liquor in 80 DEG C of water-bath afterwards；
Step 5, sticky mass will be obtained through step 4 it will be put into baking oven to dry, will place into afterwards full of nitrogen or argon gas Carbide furnace in, carbide furnace first with 2 DEG C/min heating rate rises to 300 DEG C, and the carbonization for then carrying out 3h at this temperature is protected Temperature, afterwards retort be cooled to room temperature and obtain porous carbon
Biomass porous carbon sulphur composite material and preparation method thereof of the invention based on bracteal leaf of corn, implements according to following steps:
Step 1, by sulphur and by porous carbon made from the above method, according to 2:1 mass ratio mixes and loads ball mill In, sulphur is well mixed with porous carbon by ball action, form mixed powder；
Step 2, the mixed powder obtained through step 1 is placed in baking oven, is incubated 10h at 155 DEG C, is subsequently cooled to room Temperature obtains porous carbon sulphur composite.
Embodiment 2
Biomass porous carbon preparation method of the invention based on bracteal leaf of corn, specifically implements according to following steps：
Step 1, bracteal leaf of corn is carried out repeatedly alternately to clean with ethanol and deionized water, until cleaning fluid is clarified；
Step 2, the bracteal leaf of corn obtained through step 1 is placed in 50 DEG C of vacuum drying chamber and dried；
Step 3, bracteal leaf of corn step 2 obtained is put into the carbide furnace full of nitrogen or argon gas, and carbide furnace is first with 5 DEG C/min heating rate rises to 500 DEG C, 3.5h carbonization insulation is then carried out at this temperature, and retort is cooled to room afterwards Temperature obtains biomass carbon；
Step 4, by the biomass carbon obtained in step 3 and potassium hydroxide according to 1：2 mass ratio mixing, then adds and goes Stirring forms mixed liquor in ionized water, is evaporated to form sticky mass by mixed liquor in 80 DEG C of water-bath afterwards；
Step 5, sticky mass will be obtained through step 4 it will be put into baking oven to dry, will place into afterwards full of nitrogen or argon gas Carbide furnace in, carbide furnace first with 5 DEG C/min heating rate rises to 500 DEG C, then carries out 3.5h carbonization at this temperature Insulation, retort is cooled to room temperature and obtains porous carbon afterwards
Biomass porous carbon sulphur composite material and preparation method thereof of the invention based on bracteal leaf of corn, implements according to following steps:
Step 1, by sulphur and by porous carbon made from the above method, according to 2.5:1 mass ratio mixes and loads ball milling In machine, sulphur is well mixed with porous carbon by ball action, form mixed powder；
Step 2, the mixed powder obtained through step 1 is placed in baking oven, is incubated 10.5h at 156 DEG C, is subsequently cooled to Room temperature obtains porous carbon sulphur composite.
Embodiment 3
Biomass porous carbon preparation method of the invention based on bracteal leaf of corn, specifically implements according to following steps：
Step 1, bracteal leaf of corn is carried out repeatedly alternately to clean with ethanol and deionized water, until cleaning fluid is clarified；
Step 2, the bracteal leaf of corn obtained through step 1 is placed in 50 DEG C of vacuum drying chamber and dried；
Step 3, bracteal leaf of corn step 2 obtained is put into the carbide furnace full of nitrogen or argon gas, and carbide furnace is first with 7 DEG C/min heating rate rises to 600 DEG C, 4h carbonization insulation is then carried out at this temperature, and retort is cooled to room temperature afterwards Obtain biomass carbon；
Step 4, by the biomass carbon obtained in step 3 and potassium hydroxide according to 1：2.5 mass ratio mixing, is then added Stirring forms mixed liquor in deionized water, is evaporated to form sticky mass by mixed liquor in 80 DEG C of water-bath afterwards；
Step 5, sticky mass will be obtained through step 4 it will be put into baking oven to dry, will place into afterwards full of nitrogen or argon gas Carbide furnace in, carbide furnace first with 7 DEG C/min heating rate rises to 600 DEG C, and the carbonization for then carrying out 4h at this temperature is protected Temperature, afterwards retort be cooled to room temperature and obtain porous carbon.
Biomass porous carbon sulphur composite material and preparation method thereof of the invention based on bracteal leaf of corn, implements according to following steps:
Step 1, by sulphur and by porous carbon made from the above method, according to 3:1 mass ratio mixes and loads ball mill In, sulphur is well mixed with porous carbon by ball action, form mixed powder；
Step 2, the mixed powder obtained through step 1 is placed in baking oven, 10h-12h is incubated at 157 DEG C, is then cooled down Porous carbon sulphur composite is obtained to room temperature.
Embodiment 4
Biomass porous carbon preparation method of the invention based on bracteal leaf of corn, specifically implements according to following steps：
Step 1, bracteal leaf of corn is carried out repeatedly alternately to clean with ethanol and deionized water, until cleaning fluid is clarified；
Step 2, the bracteal leaf of corn obtained through step 1 is placed in 50 DEG C of vacuum drying chamber and dried；
Step 3, bracteal leaf of corn step 2 obtained is put into the carbide furnace full of nitrogen or argon gas, and carbide furnace is first with 10 DEG C/min heating rate rises to 800 DEG C, 4.5h carbonization insulation is then carried out at this temperature, and retort is cooled to room afterwards Temperature obtains biomass carbon；
Step 4, by the biomass carbon obtained in step 3 and potassium hydroxide according to 1：3 mass ratio mixing, then adds and goes Stirring forms mixed liquor in ionized water, is evaporated to form sticky mass by mixed liquor in 80 DEG C of water-bath afterwards；
Step 5, sticky mass will be obtained through step 4 it will be put into baking oven to dry, will place into afterwards full of nitrogen or argon gas Carbide furnace in, carbide furnace first with 10 DEG C/min heating rate rises to 800 DEG C, then carries out 4.5h carbonization at this temperature Insulation, retort is cooled to room temperature and obtains porous carbon afterwards
Biomass porous carbon sulphur composite material and preparation method thereof of the invention based on bracteal leaf of corn, implements according to following steps:
Step 1, by sulphur and by porous carbon made from the above method, according to 3.5:1 mass ratio mixes and loads ball milling In machine, sulphur is well mixed with porous carbon by ball action, form mixed powder；
Step 2, the mixed powder obtained through step 1 is placed in baking oven, 10h-12h is incubated at 157 DEG C, is then cooled down Porous carbon sulphur composite is obtained to room temperature.
Embodiment 5
Biomass porous carbon preparation method of the invention based on bracteal leaf of corn, specifically implements according to following steps：
Step 1, bracteal leaf of corn is carried out repeatedly alternately to clean with ethanol and deionized water, until cleaning fluid is clarified；
Step 2, the bracteal leaf of corn obtained through step 1 is placed in 50 DEG C of vacuum drying chamber and dried；
Step 3, bracteal leaf of corn step 2 obtained is put into the carbide furnace full of nitrogen or argon gas, and carbide furnace is first with 12 DEG C/min heating rate rises to 900 DEG C, 5h carbonization insulation is then carried out at this temperature, and retort is cooled to room temperature afterwards Obtain biomass carbon；
Step 4, by the biomass carbon obtained in step 3 and potassium hydroxide according to 1：4 mass ratio mixing, then adds and goes Stirring forms mixed liquor in ionized water, is evaporated to form sticky mass by mixed liquor in 80 DEG C of water-bath afterwards；
Step 5, sticky mass will be obtained through step 4 it will be put into baking oven to dry, will place into afterwards full of nitrogen or argon gas Carbide furnace in, carbide furnace first with 12 DEG C/min heating rate rises to 900 DEG C, and the carbonization for then carrying out 5h at this temperature is protected Temperature, afterwards retort be cooled to room temperature and obtain porous carbon
Biomass porous carbon sulphur composite material and preparation method thereof of the invention based on bracteal leaf of corn, implements according to following steps:
Step 1, by sulphur and by porous carbon made from the above method, according to 4:1 mass ratio mixes and loads ball mill In, sulphur is well mixed with porous carbon by ball action, form mixed powder；
Step 2, the mixed powder obtained through step 1 is placed in baking oven, is incubated 12h at 158 DEG C, is subsequently cooled to room Temperature obtains porous carbon sulphur composite.

Claims (7)

1. the biomass porous carbon preparation method based on bracteal leaf of corn, it is characterised in that specifically implement according to following steps：
Step 1, bracteal leaf of corn is washed with cleaning fluid, until cleaning fluid is clarified；
Step 2, the bracteal leaf of corn obtained through step 1 is placed in vacuum drying chamber and dried；
Step 3, the bracteal leaf of corn obtained through step 2 is put into the carbide furnace full of inert gas, carbide furnace is first with 2 DEG C -12 DEG C/min heating rate rises to 300 DEG C -900 DEG C, 3h-5h carbonization insulation is then carried out at this temperature, afterwards retort It is cooled to room temperature and obtains biomass carbon；
Step 4, by the biomass carbon through being obtained in step 3 and potassium hydroxide according to 1：1-4 mass ratio mixing, then adds and goes Stirring forms mixed liquor in ionized water, is evaporated to form sticky mass by mixed liquor at a constant temperature afterwards；
Step 5, sticky mass will be obtained through step 4 it will be put into baking oven to dry, and will place into the carbonization full of inert gas afterwards In stove, carbide furnace first rises to 300 DEG C -900 DEG C with 2 DEG C -12 DEG C/min heating rate, then carries out 3h-5h at this temperature Carbonization insulation, retort is cooled to room temperature and obtains porous carbon afterwards.
2. the biomass porous carbon preparation method according to claim 1 based on bracteal leaf of corn, it is characterised in that described In step 1：Cleaning fluid used is ethanol and deionized water.
3. the biomass porous carbon preparation method according to claim 2 based on bracteal leaf of corn, it is characterised in that described In step 1：The ethanol and deionized water carry out repeatedly alternately cleaning to bracteal leaf of corn.
4. the biomass porous carbon preparation method according to claim 1 based on bracteal leaf of corn, it is characterised in that described In step 2：The temperature that vacuum drying chamber is dried is 50 DEG C.
5. the biomass porous carbon preparation method according to claim 1 based on bracteal leaf of corn, it is characterised in that described In step 3：The inert gas is nitrogen or argon gas.
6. the biomass porous carbon preparation method according to claim 1 based on bracteal leaf of corn, it is characterised in that described In step 4：Described constant temperature is 80 DEG C.
7. the biomass porous carbon sulphur composite material and preparation method thereof based on bracteal leaf of corn, utilizes any one of claim 1-6 institutes The porous carbon that the biomass porous carbon preparation method based on bracteal leaf of corn stated is prepared is realized, it is characterised in that according to following Step is implemented：
Step 1, it is 2-4 according to mass ratio：1 weighs sulphur, the porous carbon respectively, and the sulphur weighed and porous carbon are mixed and added Into ball mill, sulphur is well mixed with porous carbon by the ball action of ball mill, form mixed powder；
Step 2, mixed powder step 1 obtained is put into baking oven, is incubated 10h-12h at 155 DEG C -158 DEG C, is subsequently cooled to Room temperature obtains porous carbon sulphur composite.
CN201710641106.3A 2017-07-31 2017-07-31 The preparation method of biomass porous carbon and carbon sulphur composite based on bracteal leaf of corn Pending CN107689445A (en)

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CN110880599A (en) * 2018-09-06 2020-03-13 天津大学 Preparation method of high-performance fluorinated peanut shell hard carbon electrode material

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CN110880599A (en) * 2018-09-06 2020-03-13 天津大学 Preparation method of high-performance fluorinated peanut shell hard carbon electrode material
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