CN116443875A - Preparation method and application of nitrogen-doped porous carbon material - Google Patents
Preparation method and application of nitrogen-doped porous carbon material Download PDFInfo
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- 235000002017 Zea mays subsp mays Nutrition 0.000 claims abstract description 46
- 235000005822 corn Nutrition 0.000 claims abstract description 46
- 238000005406 washing Methods 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 22
- 239000007772 electrode material Substances 0.000 claims abstract description 22
- 238000011282 treatment Methods 0.000 claims abstract description 22
- 241000233866 Fungi Species 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
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- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002243 precursor Substances 0.000 claims abstract description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 239000002699 waste material Substances 0.000 claims abstract description 11
- 230000004913 activation Effects 0.000 claims abstract description 8
- 238000007873 sieving Methods 0.000 claims abstract description 8
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004202 carbamide Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000010000 carbonizing Methods 0.000 claims abstract description 4
- 230000001954 sterilising effect Effects 0.000 claims abstract description 4
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- 239000002028 Biomass Substances 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 241000222393 Phanerochaete chrysosporium Species 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000003763 carbonization Methods 0.000 claims description 5
- 239000011149 active material Substances 0.000 claims description 4
- 239000006230 acetylene black Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
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- 235000019441 ethanol Nutrition 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
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- 229910052759 nickel Inorganic materials 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
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- 238000012258 culturing Methods 0.000 claims description 2
- 239000001963 growth medium Substances 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 9
- 239000003610 charcoal Substances 0.000 description 15
- 239000003990 capacitor Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 239000010902 straw Substances 0.000 description 5
- 239000008187 granular material Substances 0.000 description 4
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- 239000003792 electrolyte Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000010907 stover Substances 0.000 description 2
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Classifications
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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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Power Engineering (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a preparation method and application of a nitrogen-doped porous carbon material, which specifically comprises the following steps: crushing waste corn stalks, washing the crushed waste corn stalks with deionized water, and drying the washed waste corn stalks; sterilizing the dried corn stalk powder; uniformly mixing sterilized corn stalk powder and fungus spore liquid, performing constant temperature treatment, filtering, washing and drying to obtain a carbonized precursor; carbonizing the carbonized precursor; dissolving corn stalk carbide, urea and KOH in deionized water, magnetically stirring, drying and sieving to obtain an activated precursor; the activation precursor is added in N 2 Performing activation treatment in atmosphere, washing the activated product with hydrochloric acid, washing with deionized water to neutrality, washing with absolute ethanol, drying, grinding, and sieving to obtain nitrogen-doped porous carbon material. The preparation method has the advantages of low cost, simple steps, high nitrogen doping efficiency, high specific capacity of the electrode material and good cycle stability when being applied to the preparation of the electrode material.
Description
Technical Field
The invention belongs to the technical field of biomass carbon material preparation, relates to preparation of a nitrogen-doped porous carbon material, and in particular relates to a preparation method of the nitrogen-doped porous carbon material and application of the nitrogen-doped porous carbon material in preparation of a high-performance electrode material.
Background
With the increasing demand for energy and the increasing prominence of environmental issues, the development of advanced energy storage devices and management systems has become a trend in the energy industry. Supercapacitors are also known as supercapacitors or electrochemical double layer capacitors. The advantages of high power density, high charge and discharge speed, long service life, wide working temperature and the like are considered to be one of the most interesting and promising energy storage devices.
Currently, a key problem limiting the large-scale application of supercapacitors is the low energy density of supercapacitors. The energy density of the supercapacitor can be increased by increasing the specific capacitance, which is mainly dependent on the properties of the electrode material.
The biomass charcoal material has the characteristics of wide sources, abundant heteroatoms, natural pore channels and the like, and becomes one of research hot spots of the supercapacitor electrode material. The structural characteristics of the biomass charcoal material are closely related to the electrochemical performance of the supercapacitor, such as specific surface area, surface property, conductivity, pore size and the like. The biomass carbon material prepared by the traditional process has the advantages of small quantity of macroporous structures and low nitrogen doping rate, so that electrolyte ions are difficult to transport, and the prepared super capacitor has lower electrochemical performance. Although the traditional physical and chemical pretreatment method can realize the regulation and control of the biomass charcoal material by changing the composition and structure of biomass, the original skeleton of the pretreated biomass part collapses to cause the blockage of the internal pores of the biomass, so that the nitrogen source is difficult to fully dope with the biomass base material, the nitrogen source is easy to run off in the subsequent treatment process, and finally the electrochemical performance of the carbon material is adversely affected.
Therefore, development of a new preparation method of a nitrogen-doped porous carbon material is needed to realize sufficient doping of a nitrogen source and a biomass substrate, so as to obtain a high-performance electrode material with high specific capacity and good cycle stability.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of a nitrogen-doped porous carbon material, which has the advantages of low cost, simple steps, high nitrogen doping efficiency, high specific capacity of the electrode material and good cycle stability when being applied to the preparation of the electrode material.
The invention is realized by the following technical scheme:
the preparation method of the high-performance supercapacitor electrode material comprises the following steps:
1) Crushing waste corn stalks, washing the crushed waste corn stalks with deionized water to remove impurities on the surfaces of corn stalk powder, and drying the washed waste corn stalk powder;
2) Uniformly mixing the dried corn stalk powder with deionized water, and performing sterilization treatment to obtain sterilized corn stalk powder;
3) Uniformly mixing sterilized corn stalk powder and fungus spore liquid, performing constant temperature treatment, filtering, washing and drying to obtain a carbonized precursor;
4) Carbonizing the carbonized precursor to obtain corn stalk carbonized matter;
5) Dissolving corn stalk carbide, urea and KOH in deionized water, magnetically stirring, drying and sieving to obtain an activated precursor;
6) And (3) performing activation treatment on the activated precursor in an N2 atmosphere, washing the activated product with hydrochloric acid, washing with deionized water to neutrality, washing with absolute ethyl alcohol, drying, grinding and sieving to obtain the nitrogen-doped porous carbon material.
The invention further improves the scheme as follows:
the drying temperature in the step 1) is 100-110 ℃ and the drying time is 10-14 h; the grain diameter of the crushed corn stalk powder is 40-60 meshes; the mass ratio of the corn stalk powder to the deionized water is 1:2-5.
Further, in the step 3), fungus spore liquid is obtained by inoculating Phanerochaete chrysosporium (Phanerochaete chrysosporium SHBCC D22643) to a culture medium for culturing, washing with water and filtering; the constant temperature treatment is carried out at 25-32 ℃ for 1-3 weeks.
Further, the carbonization treatment temperature in the step 4) is 480-520 ℃, and the carbonization time is 8-15 min.
Further, in the step 5), the mass ratio of the corn stalk carbide, urea and KOH is 1:0.8-1.2:0.8-1.2.
Further, the temperature of the activation treatment in the step 6) is 750-850 ℃ and the time is 80-100 min.
Further, the molar concentration of the hydrochloric acid in the step 6) is 0.8-1.2 mol/L, and the hydrochloric acid is sieved by a 200-mesh sieve.
The invention further improves the scheme as follows:
the nitrogen-doped porous carbon material prepared by the method is applied to the preparation of high-performance electrode materials.
Further, the specific application process is as follows: mixing nitrogen-doped porous carbon serving as an active material, acetylene black serving as a conductive agent and polytetrafluoroethylene emulsion serving as a binder in a mass ratio of 8:0.8-1.2:0.8-1.2 in a mortar, adding ethanol, fully grinding and uniformly mixing to obtain slurry, smearing the slurry on foamed nickel of 1 cm multiplied by 1 cm, drying and tabletting to obtain the biomass carbon electrode.
Compared with the prior art, the invention has the beneficial effects that:
first, the invention prepares the high-performance super capacitor electrode material by using the corn straw pretreated by fungi and the preparation method thereof, and the high-performance electrode material with high nitrogen doping rate, high energy storage specific capacity and good cycle stability is obtained. Provides a new way for the comprehensive utilization of biomass resources.
Secondly, the invention prepares the high-performance supercapacitor electrode material by pretreating corn stalks with fungi and the preparation method thereof, and the invention takes the corn stalks as raw materials, is waste biomass, has rich sources and realizes the recycling of resources.
Thirdly, the invention prepares the high-performance super capacitor electrode material by pretreating corn straw with fungi and the preparation method thereof, and the invention utilizes lignocellulose degrading enzyme generated by fungi to destroy a wax layer on the surface of biomass and widen the pore structure on the surface of biomass, so that urea molecules penetrate into the material and further improve the nitrogen doping amount of the carbon material.
Fourthly, the invention prepares the high-performance super capacitor electrode material by pretreating corn straw with fungi and the preparation method thereof, and the invention utilizes lignocellulose degrading enzyme generated by fungi to destroy biomass so that fungus hyphae directly enter the biomass, widens pores, enables electrolyte to enter the material, and improves electrochemical performance.
Fifth, the electrode material for preparing the high-performance super capacitor by using the corn straw pretreated by fungi and the preparation method thereof, and the prepared electrode material has high specific capacitance, high rate capability and good cycle stability.
Drawings
FIG. 1 is an SEM image of the corn stover char obtained in example 1;
FIG. 2 is an SEM image of the corn stover char obtained in example 3;
FIG. 3 is a CV graph of the biomass charcoal electrode sheet obtained in example 4 at different scanning rates;
FIG. 4 is a graph showing the GCD of the biomass charcoal electrode plates obtained in example 4 at different current densities;
FIG. 5 is a CV graph of the biomass charcoal electrode sheet obtained in example 5 at different scanning rates;
FIG. 6 is a graph showing the GCD of the biomass charcoal electrode plates obtained in example 5 at different current densities;
FIG. 7 is a graph showing the cycle stability of the biomass electrode sheet obtained in example 4 at a current density of 10A/g.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1: preparation of fungus spore liquid
After the Phanerochaete chrysosporium Phanerochaete chrysosporium freeze-dried powder is activated, the Phanerochaete chrysosporium freeze-dried powder is transferred into a comprehensive PDA flat plate, and is cultured for 7-9 days at the temperature of 27 ℃ in an incubator. After the flat plate is full of the bacteria-carrying wires, the sterilized water is dripped into the flat plate, the sterilized inoculating loop is used for gently scraping fungus hyphae, the fungus hyphae are filtered by gauze, the fungus hyphae are poured into a 250 mL conical flask, and the volume of the fungus spore liquid is fixed by sterilized deionized water, so that Phanerochaete chrysosporium fungus spore liquid is obtained.
Example 2: preparation of nitrogen-doped porous carbon material
1) Crushing the waste corn stalks, wherein the particle size of the crushed granules is 40-60 meshes, continuously washing the crushed granules with deionized water with the weight of 2-5 times of that of the crushed granules until the washing liquid is not turbid, and drying the washed granules at 100-110 ℃ for 10-14 hours after the washing liquid is regarded as impurities on the surfaces of the raw materials are removed;
2) Uniformly mixing the dried corn stalk powder with deionized water, and performing sterilization treatment to obtain sterilized corn stalk powder;
3) The sterilized corn stalk powder and the fungus spore liquid are mixed according to the mass volume ratio of 30 to g:10 Uniformly mixing the mL, carrying out constant temperature treatment for 1 week at 25-32 ℃, filtering, washing and drying to obtain a carbonized precursor;
4) Carbonizing the carbonized precursor at 480-520 ℃ for 8-15 min to obtain corn straw carbonized product; the corn stalk carbide is observed by using an electron scanning microscope (SEM), and the result is shown in figure 1, after fungi treatment, the surface of the carbide has a developed pore structure, which is beneficial to the infiltration of nitrogen sources and activators;
5) Dissolving corn stalk carbide, urea and KOH in deionized water according to the mass ratio of 1:0.8-1.2:0.8-1.2, magnetically stirring, drying, and sieving with a 60-mesh sieve to obtain an activated precursor;
6) And (3) performing activation treatment on the activated precursor for 80-100 min at the temperature of 750-850 ℃ in an N2 atmosphere, washing the activated product with 0.8-1.2 mol/L hydrochloric acid, washing with deionized water to neutrality, washing with absolute ethyl alcohol, drying, grinding and sieving to obtain the nitrogen-doped porous carbon material.
Example 3: preparation of nitrogen-doped porous carbon material
Step 3) the constant temperature treatment time was 3 weeks, and the other operations were performed in example 2, wherein the corn stalk char obtained by the fungus treatment for 3 weeks and the carbonization treatment was observed by using an electron scanning microscope (SEM), and the results are shown in fig. 2.
Example 4: preparation of biomass charcoal electrode
The nitrogen-doped porous carbon material prepared in the example 2 is used as an active material, acetylene black is used as a conductive agent, polytetrafluoroethylene emulsion is used as a binder, the mixture is mixed in a mortar according to the mass ratio of 8:1:1, ethanol is added, the mixture is sufficiently ground and uniformly mixed to obtain slurry, about 5 mg slurry is smeared on foam nickel of 1 cm multiplied by 1 cm, and the slurry is pressed for 2 minutes under the pressure of 10 MPa after being dried, so that the biomass carbon electrode is obtained.
Example 5: preparation of biomass charcoal electrode
The procedure of example 4 was otherwise followed using the nitrogen-doped porous carbon material prepared in example 3 as an active material.
Example 6: performance testing
The biomass charcoal electrodes prepared in examples 4 and 5 were subjected to electrochemical tests in a three-electrode system using a CS310M electrochemical workstation, with the prepared biomass charcoal electrode as a working electrode, a platinum sheet electrode (2 cm ×2 cm) as a counter electrode, and an Hg/HgO electrode as a reference electrode, and were subjected to electrochemical tests in a 6M KOH solution. The potential window ranges from-0.8 to 0.2V, constant current discharges at different current densities, according to the specific capacitance calculation formula cs=iΔt/(m×Δv). Wherein Cs is the mass specific capacitance of the sample, and the unit is F/g; i is discharge current, and the unit is A; Δt is discharge time, with the unit being s; m is the mass of active substances on the electrode slice, and the unit is g; deltaV is the potential difference in V.
The results obtained are as follows:
FIG. 3 is a CV curve diagram of the biomass charcoal electrode sheet obtained in example 4 under different scanning rates, wherein the CV curve shows good rectangle, no obvious deformation is generated under the scanning rate of 2-100 mV s < -1 >, and the specific capacitance of the prepared electrode material mainly originates from an electric double layer capacitor;
FIG. 4 is a graph showing the GCD of the biomass charcoal electrode plate obtained in example 4 at different current densities, wherein the specific capacitances of the electrode plate are 303.9F/g, 286.1F/g, 273.8F/g, 260.0F/g and 252.4F/g at the current densities of 0.5A/g,1A/g,2A/g,5A/g and 10A/g respectively;
FIG. 5 is a CV curve graph of the biomass charcoal electrode sheet obtained in example 5 under different scanning rates, wherein the CV curve shows good rectangle, no obvious deformation is generated under the scanning rate of 2-100 mV s < -1 >, and the specific capacitance of the prepared electrode material mainly originates from an electric double layer capacitor;
FIG. 6 is a graph showing the GCD of the biomass charcoal electrode plate obtained in example 5 at different current densities, wherein the specific capacitances of the electrode plate are 408.7F/g, 377.2F/g, 356.8F/g, 335.8F/g and 320.4F/g at current densities of 0.5A/g,1A/g,2A/g,5A/g and 10A/g, respectively;
fig. 7 is a graph showing the cycle stability of the biomass electrode sheet obtained in example 4 at a current density of 10A/g, and the electrode material was tested and evaluated for cycle life by constant current charge-discharge cycles, and after 10000 cycles at 10A/g, the capacitance retention rate was 89.5%, with good cycle stability.
The foregoing embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. The preparation method of the nitrogen-doped porous carbon material is characterized by comprising the following steps of:
1) Crushing waste corn stalks, washing the crushed waste corn stalks with deionized water to remove impurities on the surfaces of corn stalk powder, and drying the washed waste corn stalk powder;
2) Uniformly mixing the dried corn stalk powder with deionized water, and performing sterilization treatment to obtain sterilized corn stalk powder;
3) Uniformly mixing sterilized corn stalk powder and fungus spore liquid, performing constant temperature treatment, filtering, washing and drying to obtain a carbonized precursor;
4) Carbonizing the carbonized precursor to obtain corn stalk carbonized matter;
5) Dissolving corn stalk carbide, urea and KOH in deionized water, magnetically stirring, drying and sieving to obtain an activated precursor;
6) The activation precursor is added in N 2 And (3) performing activation treatment in an atmosphere, washing the activated product with hydrochloric acid, washing with deionized water to be neutral, washing with absolute ethyl alcohol, drying, grinding and sieving to obtain the nitrogen-doped porous carbon material.
2. The method for preparing the nitrogen-doped porous carbon material according to claim 1, wherein the method comprises the following steps: the drying temperature in the step 1) is 100-110 ℃ and the drying time is 10-14 h; the grain diameter of the crushed corn stalk powder is 40-60 meshes; the mass ratio of the corn stalk powder to the deionized water is 1:2-5.
3. The method for preparing the nitrogen-doped porous carbon material according to claim 1, wherein the method comprises the following steps: the fungus spore liquid in the step 3) is obtained by inoculating Phanerochaete chrysosporium to a culture medium for culturing, washing and filtering; the constant temperature treatment is carried out at 25-32 ℃ for 1-3 weeks.
4. The method for preparing the nitrogen-doped porous carbon material according to claim 1, wherein the method comprises the following steps: the carbonization treatment temperature in the step 4) is 480-520 ℃, and the carbonization time is 8-15 min.
5. The method for preparing the nitrogen-doped porous carbon material according to claim 1, wherein the method comprises the following steps: in the step 5), the mass ratio of the corn stalk carbide to the urea to the KOH is 1:0.8-1.2:0.8-1.2.
6. The method for preparing the nitrogen-doped porous carbon material according to claim 1, wherein the method comprises the following steps: the temperature of the activation treatment in the step 6) is 750-850 ℃ and the time is 80-100 min.
7. The method for preparing the nitrogen-doped porous carbon material according to claim 1, wherein the method comprises the following steps: and 6) the molar concentration of the hydrochloric acid in the step 6) is 0.8-1.2 mol/L, and the hydrochloric acid is sieved by a 200-mesh sieve.
8. Use of a nitrogen-doped porous carbon material prepared by the method of any one of claims 1-7 in the preparation of a high performance electrode material.
9. The use of the nitrogen-doped porous carbon material according to claim 8 for preparing high-performance electrode materials, wherein the specific process is: mixing nitrogen-doped porous carbon serving as an active material, acetylene black serving as a conductive agent and polytetrafluoroethylene emulsion serving as a binder in a mass ratio of 8:0.8-1.2:0.8-1.2 in a mortar, adding ethanol, fully grinding and uniformly mixing to obtain slurry, smearing the slurry on foamed nickel of 1 cm multiplied by 1 cm, drying and tabletting to obtain the biomass carbon electrode.
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