CN108539149B - Graphene composite nitrogen and oxygen co-doped biomass carbon material and preparation method thereof - Google Patents

Graphene composite nitrogen and oxygen co-doped biomass carbon material and preparation method thereof Download PDF

Info

Publication number
CN108539149B
CN108539149B CN201810245373.3A CN201810245373A CN108539149B CN 108539149 B CN108539149 B CN 108539149B CN 201810245373 A CN201810245373 A CN 201810245373A CN 108539149 B CN108539149 B CN 108539149B
Authority
CN
China
Prior art keywords
oxygen
graphene
carbon material
nitrogen
biomass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810245373.3A
Other languages
Chinese (zh)
Other versions
CN108539149A (en
Inventor
谌伟民
喻发全
万尹佳
蔡宁
薛亚楠
王建芝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Qina New Energy Technology Co.,Ltd.
Original Assignee
Wuhan Institute of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan Institute of Technology filed Critical Wuhan Institute of Technology
Priority to CN201810245373.3A priority Critical patent/CN108539149B/en
Publication of CN108539149A publication Critical patent/CN108539149A/en
Application granted granted Critical
Publication of CN108539149B publication Critical patent/CN108539149B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • 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
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention discloses a preparation method of a graphene composite nitrogen and oxygen co-doped biomass carbon material. The liquid-liquid mixing mode adopted by the invention can promote the biomass and the graphene oxide to be uniformly dispersed and fully contacted, and can effectively inhibit the agglomeration phenomenon and the lamination phenomenon of graphene sheets during biomass carbonization during high-temperature treatment, so that the graphene and carbon in the obtained composite material are more uniformly distributed, and in-situ nitrogen and oxygen co-doping is realized.

Description

Graphene composite nitrogen and oxygen co-doped biomass carbon material and preparation method thereof
Technical Field
The invention belongs to the field of biomass carbon material preparation, and particularly relates to a graphene composite nitrogen and oxygen co-doped biomass carbon material and a preparation method thereof.
Background
Among various materials for solving the problems of energy and environment, carbon materials are favored by researchers with their unique advantages. Particularly in the field of electrochemical energy storage, carbon materials are widely applied to electrode material systems due to the characteristics of high specific surface area, high stability, good thermal stability, low price and the like. Compared with the traditional method for preparing the carbon material, the method for directly synthesizing the carbon material by using the biomass as the precursor has the advantages of low cost and green, simple and convenient synthesis method, and is easier for large-scale industrial production. Meanwhile, when the biomass is used for synthesizing the carbon material, heteroatoms such as nitrogen and oxygen are introduced in situ, the electronic structure of the carbon layer is changed, and new energy storage active sites are formed on the interface and the surface. Therefore, the biomass carbon material has wide application prospect in the fields of lithium ion batteries, sodium ion batteries, super capacitors and the like due to the excellent performance of the biomass carbon material. However, carbon is easy to agglomerate in the process of preparing the biomass carbon material by pyrolysis, so that the active sites of the carbon are reduced, and the application of the carbon in the aspect of energy storage is greatly limited.
In order to solve this problem, the application of carbon materials has been expanded, and composites of carbon and other materials have been widely studied. Graphene is a two-dimensional allotrope of carbon, and has many excellent characteristics such as high electrical conductivity, high thermal conductivity, high mechanical strength and high electrochemical stability, and thus has been widely noticed by people. The graphene/carbon composite can enable the structure and the property of graphene and carbon to be complementary, the respective advantages of the graphene and the carbon are fully exerted, the energy storage sites are rich in carbon materials, the electrical conductivity of the composite material can be improved by utilizing the excellent electrical conductivity of the graphene, and the energy storage performance of the composite material is more excellent than that of a single material through the synergistic effect of the graphene and the carbon. However, in the conventional method for preparing the graphene/biomass carbon composite, the biomass material is generally carbonized to obtain solid carbon powder, and then the solid carbon powder is mixed with graphene powder or a graphene oxide solution to prepare the graphene/biomass carbon composite. The method has a complex process, and the carbon powder and the graphene or the graphene oxide are difficult to be uniformly mixed, so that the electrochemical performance of the obtained compound is not obviously improved. Therefore, further exploring a simple and feasible method for preparing the graphene composite heterogeneous element doped biomass carbon material has important significance for simplifying the preparation process of the biomass carbon material, improving the energy storage performance of the biomass carbon and accelerating the popularization and application of the biomass carbon.
Disclosure of Invention
In view of the technical defects and improvement requirements of the prior art, the main object of the present invention is to provide a simple and easy preparation method and product of graphene composite nitrogen and oxygen co-doped biomass carbon material, wherein a biomass raw material is first prepared into a cellulose solution, then dispersed in a graphene oxide solution and uniformly mixed, and subjected to high temperature treatment after freeze-drying to prepare the composite carbon material.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a graphene composite nitrogen and oxygen co-doped biomass carbon material adopts a solution blending method to obtain a composite material of graphene and a biomass-based carbon material which are uniformly dispersed, and specifically comprises the following steps:
1) dispersing the biomass material in a precooled sodium hydroxide/urea/water solution, and sequentially stirring and carrying out centrifugal defoaming to obtain a transparent solution;
2) dispersing the transparent solution in a graphene oxide solution, adding organic amine, performing magnetic stirring at normal temperature, and performing centrifugal separation to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water, and freeze-drying to obtain a solid block;
4) calcining the solid block obtained in the step 3) in an inert atmosphere and then naturally cooling to obtain the graphene composite nitrogen and oxygen co-doped biomass carbon material.
In the above scheme, the biomass is preferably cotton, silk or chitin.
In the scheme, the precooling temperature in the step 1) is-10 to-15 ℃.
In the scheme, the mass ratio of the sodium hydroxide, the urea and the water in the sodium hydroxide/urea/water solution is 1 (1-3) to 8-12.
In the scheme, the mass ratio of the biomass to the sodium hydroxide/urea/water solution is 1 (10-50).
In the scheme, the rotating speed adopted by the centrifugal defoaming is 6000-9000 rpm.
In the scheme, the centrifugal defoaming temperature is 10-20 ℃.
In the scheme, the mass ratio of the graphene oxide to the biomass material in the step 2) is 1 (25-100).
In the scheme, the concentration of the graphene oxide solution in the step 2) is 4-5 mg/mL.
In the above scheme, the organic amine in step 2) is one or a mixture of ethylene diamine, propylene diamine, 1, 4-butanediamine, 1, 5-pentanediamine, and hexamethylene diamine.
In the scheme, the mass ratio of the graphene oxide to the organic amine in the step 2) is 1 (0.5-5).
In the scheme, the magnetic stirring time is 12-48 h.
In the scheme, the rotating speed adopted by centrifugal separation is 6000-9000 rpm.
In the scheme, the centrifugal separation temperature is 10-20 ℃.
In the scheme, the freeze drying is carried out at the temperature of-70 to-30 ℃ and under the pressure of 10 to 50Pa, and the drying time is 20 to 60 hours.
In the above scheme, the inert atmosphere is argon or nitrogen atmosphere.
In the above scheme, the calcination process is as follows: firstly, heating to 300-400 ℃, preserving heat for 0.5-3 h, then heating to 600-1000 ℃, and preserving heat for 2-4 h.
In the scheme, the heating rate is 1-2 ℃ min-1。
The graphene composite nitrogen and oxygen co-doped biomass carbon material prepared according to the scheme is of a sheet structure and has folds and regular lattice stripes, wherein the content of nitrogen is 2.0-5.0 at.%, and the content of oxygen is 3.0-7.0 at.%.
The basic principle of the invention is that a solution blending method is adopted to mix a biomass raw material and graphene oxide in a solution, and then the graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared through freeze drying and high-temperature treatment. The biomass can be promoted to be fully contacted with the graphene oxide by adopting a liquid-liquid mixing mode, the uniform dispersion performance of the biomass and the graphite oxide during high-temperature treatment can effectively inhibit the agglomeration phenomenon and the lamination phenomenon of graphene sheet layers during biomass carbonization, the graphene and carbon in the obtained composite material are more uniformly distributed, and in-situ nitrogen and oxygen co-doping is carried out simultaneously.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, cotton, silk and chitin are used as raw materials, biomass with rich resources is fully and reasonably utilized, and the graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared. The biomass is the most abundant renewable resource on the earth, and the graphene composite biomass carbon material prepared by using the biomass as a raw material has important significance for environmental protection and ecological protection.
2) The invention adopts a 'liquid-liquid' mixing mode to realize the compounding of the biomass and the graphene, and has the advantages of more sufficient contact and more uniform mixing compared with the traditional 'solid-solid' mixing or 'solid-liquid' mixing of solid carbon powder and the graphene; amino groups at two ends of the organic diamine can respectively pass through hydrogen bonds or electrostatic interaction with oxygen-containing functional groups of the graphene oxide to separate graphene oxide lamella, so that the graphene oxide is prevented from being gathered in the precipitation process, meanwhile, the dissolved biomass material is easier to diffuse into the graphene oxide lamella, the graphene oxide lamella and the dissolved biomass material are fully mixed, the graphene and carbon are more uniformly distributed in the high-temperature carbonization converted graphene composite nitrogen and oxygen co-doped biomass carbon material, and the aggregation phenomenon of the biomass during carbonization and the lamination phenomenon of the graphene lamella are effectively inhibited.
3) According to the invention, the nitrogen and oxygen element doped graphene composite carbon material is prepared by researching and setting the composite proportion, the carbonization conditions and the like, and compared with an undoped biomass carbon material, the nitrogen and oxygen element doping in the carbon material can increase additional defects and expand the interlamellar spacing of the material, so that more ions or electrons can be stored or adsorbed, and meanwhile, the uniformly compounded graphene is beneficial to the improvement of the conductivity; when the material is used for lithium ion batteries, sodium ion batteries and supercapacitor electrodes, due to the special structure, on one hand, electrolyte can be rapidly diffused to the surface of the carbon material, and on the other hand, electrons can be rapidly migrated in the composite material, so that the energy storage performance of the composite carbon material is effectively improved.
Drawings
Fig. 1 is a Scanning Electron Microscope (SEM) image of graphene composite nitrogen and oxygen co-doped biomass carbon obtained in example 1 of the present invention;
fig. 2 is a Transmission Electron Microscope (TEM) image of the graphene composite nitrogen and oxygen co-doped biomass carbon obtained in example 1 of the present invention at different magnifications;
FIG. 3 is a high-power transmission electron microscope (HR-TEM) image of the graphene composite nitrogen and oxygen co-doped biomass carbon obtained in example 1 of the present invention;
fig. 4 is an X-ray photoelectron spectroscopy (XPS) of graphene composite nitrogen and oxygen co-doped biomass carbon obtained in example 1 of the present invention.
Fig. 5 is a comparison graph of the sodium storage cycle performance of the graphene composite nitrogen and oxygen co-doped biomass carbon obtained in example 1 of the invention and the sodium ion battery obtained in the comparative example.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
A graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared by the following steps:
1) weighing 4g of cotton, adding the cotton into 200mL of sodium hydroxide/urea/water solution precooled at-12 ℃, wherein the mass ratio of the sodium hydroxide/urea/water is 7:12:81, quickly stirring for 3 minutes, and then carrying out centrifugal defoaming on the solution at the rotating speed of 7000rpm at 15 ℃ to obtain a transparent solution I;
2) placing the obtained transparent solution I in 40mL of graphene oxide solution with the concentration of 4mg/mL, then adding 0.2g of ethylenediamine, magnetically stirring for 24 hours at normal temperature, and then centrifugally separating the mixture at the temperature of 15 ℃ and the rotating speed of 7000rpm to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water and ethanol for 3 times respectively, and then placing the precipitate in a freeze dryer for drying for 24 hours at the temperature of-60 ℃ and under the condition of 10Pa to obtain a solid block;
4) placing the obtained solid block in a tubular furnace in nitrogen atmosphere, and heating at 1 deg.C/min-1And heating to 300 ℃, preserving heat for 2h, heating to 800 ℃, preserving heat for 3h, and naturally cooling to obtain the graphene composite nitrogen and oxygen co-doped biomass carbon material.
The morphology of the compound nitrogen of graphite alkene, oxygen codope living beings carbon material that this embodiment obtained is shown as Scanning Electron Microscope (SEM) figure 1, and it can be seen from figure 1 that the resultant is the lamellar structure of undulation fold, and this is favorable to the contact of carbon material and electrolyte, and the thickness of carbon piece is about 100 ~ 300 nm.
Fig. 2 is a Transmission Electron Microscope (TEM) image of the graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the present embodiment, which clearly shows that the obtained carbon material is in a wrinkled sheet shape and has no obvious stacking or agglomeration phenomenon, and illustrates that the biomass carbon and the graphene are uniformly distributed in the composite material; fig. 3 is a high power transmission electron microscope (HR-TEM) image of the product obtained in this example, in which the striations of amorphous carbon and the regular lattice striations peculiar to the graphitized carbon material are clearly visible, indicating that the obtained product is a composite of amorphous carbon and graphitized carbon, and the interlayer spacing of the graphitized carbon is 0.39nm as seen from the lattice striations.
Fig. 4 is an X-ray photoelectron spectroscopy (XPS) graph of the graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the embodiment, and it can be seen from the graph that the product mainly contains C, N, O three elements, wherein the content of nitrogen element is 2.1 at.%, and the content of oxygen element is 6.8 at.%.
The graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the embodiment is applied to the preparation of a sodium ion battery, and the specific assembly method comprises the following steps: uniformly mixing the obtained composite carbon material, conductive carbon and binder in a solvent according to a mass ratio of 8:1:1, coating the mixture on a copper foil, drying, cold pressing and punching to prepare an electrode plate, assembling the electrode plate into a sodium ion battery, and comparing the sodium storage cycle performance of the sodium ion battery with that of a composite material of biomass carbon and graphene prepared by a mechanical mixing method.
The preparation method of the comparative example comprises the following steps: mechanically milling and mixing biomass carbon and graphene, uniformly mixing the biomass carbon and graphene with conductive carbon and a binder in a solvent according to a mass ratio of 8:1:1, and assembling the sodium-ion battery according to the method; wherein the adopted biomass carbon is obtained by subjecting the cotton adopted in the example 1 to the carbonization process in the step 4).
A comparison graph of the sodium storage cycle performance of the sodium ion battery assembled by the graphene composite nitrogen and oxygen co-doped biomass carbon obtained in the embodiment and the comparative example is shown in fig. 5; the graphene composite nitrogen and oxygen co-doped biomass carbon material obtained by the invention can show good cycle performance while improving the sodium storage performance.
Example 2
A graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared by the following steps:
1) weighing 6g of cotton, adding the cotton into 200mL of sodium hydroxide/urea/water solution precooled at-12 ℃, wherein the mass ratio of the sodium hydroxide/urea/water is 7:12:81, quickly stirring for 3 minutes, and then carrying out centrifugal defoaming on the solution at the rotating speed of 8000rpm at 15 ℃ to obtain a transparent solution I;
2) placing the obtained transparent solution I in 20mL of graphene oxide solution with the concentration of 5mg/mL, then adding 0.2g of ethylenediamine, magnetically stirring for 36h at normal temperature, and then centrifugally separating the mixture at the rotation speed of 8000rpm at 15 ℃ to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water and ethanol for 3 times respectively, and then placing the precipitate in a freeze dryer for drying for 40 hours at the temperature of-70 ℃ and under the condition of 10Pa to obtain a solid block;
4) placing the obtained solid block in a tubular furnace in nitrogen atmosphere, and heating at 2 deg.C/min-1Heating to 350 ℃, preserving heat for 2 hours, heating to 800 ℃, preserving heat for 3 hours, and naturally cooling to obtain the graphene compositeNitrogen and oxygen co-doped biomass carbon material.
The graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the embodiment is in a folded sheet shape, the thickness of the biomass carbon material is about 200-350 nm, the content of nitrogen element is 3.5 at.%, and the content of oxygen element is 4.5 at.%.
Example 3
A graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared by the following steps:
1) weighing 8g of cotton, adding the cotton into 200mL of sodium hydroxide/urea/water solution precooled at-12 ℃, wherein the mass ratio of the sodium hydroxide/urea/water is 7:12:81, quickly stirring for 3 minutes, and then carrying out centrifugal defoaming on the solution at the rotating speed of 9000rpm at 15 ℃ to obtain a transparent solution I;
2) placing the obtained transparent solution I in 20mL of graphene oxide solution with the concentration of 4mg/mL, then adding 0.1g of propane diamine, magnetically stirring for 48 hours at normal temperature, and then centrifugally separating the mixture at 15 ℃ and the rotating speed of 9000rpm to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water and ethanol for 3 times respectively, and then placing the precipitate in a freeze dryer for drying for 48 hours at the temperature of-60 ℃ and under the condition of 20Pa to obtain a solid block;
4) placing the obtained solid block in a tubular furnace in nitrogen atmosphere, and heating at 1 deg.C/min-1And heating to 400 ℃, preserving heat for 2h, heating to 1000 ℃, preserving heat for 3h, and naturally cooling to obtain the graphene composite nitrogen and oxygen co-doped biomass carbon material.
The graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the embodiment is in a folded sheet shape, the thickness of the biomass carbon material is about 300-400 nm, the content of nitrogen element is 5.0at.%, and the content of oxygen element is 3.4 at.%.
Example 4
A graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared by the following steps:
1) weighing 5g of silk, adding the silk into 180mL of sodium hydroxide/urea/water solution precooled at-12 ℃, quickly stirring the mixture for 3 minutes at a mass ratio of 7:12:81, and then carrying out centrifugal defoaming on the solution at the temperature of 15 ℃ and the rotating speed of 7000rpm to obtain a transparent solution I;
2) placing the obtained transparent solution I in 50mL of graphene oxide solution with the concentration of 4mg/mL, then adding 0.4g of propane diamine, magnetically stirring for 24 hours at normal temperature, and then centrifugally separating the mixture at the rotating speed of 7000rpm at 15 ℃ to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water and ethanol for 3 times respectively, and then placing the precipitate in a freeze dryer for drying for 48 hours at the temperature of-60 ℃ and under the condition of 20Pa to obtain a solid block;
4) placing the obtained solid block in a tubular furnace in nitrogen atmosphere, and heating at 1 deg.C/min-1And heating to 350 ℃, preserving heat for 3h, heating to 900 ℃, preserving heat for 2h, and naturally cooling to obtain the graphene composite nitrogen and oxygen co-doped biomass carbon material.
The graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the embodiment is in a folded sheet shape, the thickness of the biomass carbon material is about 200-350 nm, the content of nitrogen element is 2.5 at.%, and the content of oxygen element is 7.0 at.%.
Example 5
A graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared by the following steps:
1) weighing 10g of silk, adding the silk into 180mL of sodium hydroxide/urea/water solution precooled at-12 ℃, wherein the mass ratio of the sodium hydroxide/urea/water is 7:12:81, quickly stirring for 3 minutes, and then carrying out centrifugal defoaming on the solution at the temperature of 15 ℃ and the rotating speed of 9000rpm to obtain a transparent solution I;
2) placing the obtained transparent solution I in 40mL of graphene oxide solution with the concentration of 5mg/mL, then adding 0.4g of ethylenediamine, magnetically stirring for 36h at normal temperature, and then centrifugally separating the mixture at the rotation speed of 8000rpm at 15 ℃ to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water and ethanol for 3 times respectively, and then placing the precipitate in a freeze dryer for drying for 48 hours at the temperature of-60 ℃ and under the condition of 30Pa to obtain a solid block;
4) placing the obtained solid block in a tubular furnace in nitrogen atmosphereAt a temperature rise rate of 2 ℃ min-1And heating to 350 ℃, preserving heat for 2h, heating to 1000 ℃, preserving heat for 2h, and naturally cooling to obtain the graphene composite nitrogen and oxygen co-doped biomass carbon material.
The graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the embodiment is in a folded sheet shape, the thickness of the biomass carbon material is about 200-400 nm, the content of nitrogen element is 3.8 at.%, and the content of oxygen element is 4.2 at.%.
Example 6
A graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared by the following steps:
1) weighing 15g of silk, adding the silk into 180mL of sodium hydroxide/urea/water solution precooled at-12 ℃, wherein the mass ratio of the sodium hydroxide/urea/water is 7:12:81, quickly stirring for 3 minutes, and then carrying out centrifugal defoaming on the solution at the rotating speed of 9000rpm at 15 ℃ to obtain a transparent solution I;
2) placing the obtained transparent solution I in 30mL of graphene oxide solution with the concentration of 5mg/mL, then adding 0.3g of propane diamine, magnetically stirring for 48 hours at normal temperature, and then centrifugally separating the mixture at 15 ℃ and 9000rpm to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water and ethanol for 3 times respectively, and then placing the precipitate in a freeze dryer for drying for 24 hours at the temperature of-60 ℃ and under the condition of 10Pa to obtain a solid block;
4) placing the obtained solid block in a tubular furnace in nitrogen atmosphere, and heating at 1 deg.C/min-1And heating to 300 ℃, preserving heat for 2.5h, heating to 700 ℃, preserving heat for 2h, and naturally cooling to obtain the graphene composite nitrogen and oxygen co-doped biomass carbon material.
The graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the embodiment is in a folded sheet shape, the thickness of the biomass carbon material is about 300-400 nm, the content of nitrogen element is 5.0at.%, and the content of oxygen element is 3.1 at.%.
Example 7
A graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared by the following steps:
1) weighing 6g of chitin, adding the chitin into 200mL of sodium hydroxide/urea/water solution precooled at-12 ℃, wherein the mass ratio of the sodium hydroxide/urea/water is 7:12:81, quickly stirring for 3 minutes, and then carrying out centrifugal defoaming on the solution at the rotating speed of 8000rpm at 15 ℃ to obtain a transparent solution I;
2) placing the obtained transparent solution I in 40mL of graphene oxide solution with the concentration of 5mg/mL, then adding 0.4g of hexamethylenediamine, magnetically stirring for 24 hours at normal temperature, and then centrifugally separating the mixture at the rotating speed of 7000rpm at 15 ℃ to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water and ethanol for 3 times respectively, and then placing the precipitate in a freeze dryer for drying for 24 hours at the temperature of-50 ℃ and under the condition of 10Pa to obtain a solid block;
4) placing the obtained solid block in a tubular furnace in nitrogen atmosphere, and heating at 2 deg.C/min-1And heating to 300 ℃, preserving heat for 2h, heating to 800 ℃, preserving heat for 4h, and naturally cooling to obtain the graphene composite nitrogen and oxygen co-doped biomass carbon material.
The graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the embodiment is in a folded sheet shape, the thickness of the biomass carbon material is about 200-400 nm, the content of nitrogen element is 2.0 at.%, and the content of oxygen element is 6.7 at.%.
Example 8
A graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared by the following steps:
1) weighing 9g of chitin, adding the chitin into 200mL of sodium hydroxide/urea/water solution precooled at-12 ℃, wherein the mass ratio of the sodium hydroxide/urea/water is 7:12:81, quickly stirring for 3 minutes, and then carrying out centrifugal defoaming on the solution at the rotating speed of 9000rpm at 15 ℃ to obtain a transparent solution I;
2) placing the obtained transparent solution I in 30mL of graphene oxide solution with the concentration of 5mg/mL, then adding 0.6g of hexamethylenediamine, magnetically stirring for 24 hours at normal temperature, and then centrifugally separating the mixture at 15 ℃ and 9000rpm to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water and ethanol for 3 times respectively, and then placing the precipitate in a freeze dryer for drying for 48 hours at the temperature of-60 ℃ and under the condition of 10Pa to obtain a solid block;
4) placing the obtained solid block in a tubular furnace in nitrogen atmosphere, and heating at 1 deg.C/min-1And heating to 300 ℃, preserving heat for 3h, heating to 850 ℃, preserving heat for 2h, and naturally cooling to obtain the graphene composite nitrogen and oxygen co-doped biomass carbon material.
The graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the embodiment is in a folded sheet shape, the thickness of the biomass carbon material is about 200-350 nm, the content of nitrogen element is 3.8 at.%, and the content of oxygen element is 4.6 at.%.
Example 9
A graphene composite nitrogen and oxygen co-doped biomass carbon material is prepared by the following steps:
1) weighing 12g of chitin, adding into 200mL of sodium hydroxide/urea/water solution precooled at-12 ℃, wherein the mass ratio of the sodium hydroxide/urea/water is 7:12:81, quickly stirring for 3 minutes, and then carrying out centrifugal defoaming on the solution at the rotating speed of 8000rpm at 15 ℃ to obtain a transparent solution I;
2) placing the obtained transparent solution I in 40mL of graphene oxide solution with the concentration of 4mg/mL, then adding 0.6g of hexamethylenediamine, magnetically stirring for 36h at normal temperature, and then centrifugally separating the mixture at the rotation speed of 8000rpm at 15 ℃ to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water and ethanol for 3 times respectively, and then placing the precipitate in a freeze dryer for drying for 36 hours at the temperature of-60 ℃ and under the condition of 10Pa to obtain a solid block;
4) placing the obtained solid block in a tubular furnace in nitrogen atmosphere, and heating at 2 deg.C/min-1And heating to 300 ℃, preserving heat for 2h, heating to 800 ℃, preserving heat for 2h, and naturally cooling to obtain the graphene composite nitrogen and oxygen co-doped biomass carbon material.
The graphene composite nitrogen and oxygen co-doped biomass carbon material obtained in the embodiment is in a folded sheet shape, the thickness of the biomass carbon material is about 250-400 nm, the content of nitrogen element is 4.8 at.%, and the content of oxygen element is 3.0 at.%.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.

Claims (9)

1. A preparation method of a graphene composite nitrogen and oxygen co-doped biomass carbon material is characterized by preparing a composite material of graphene and a biomass-based carbon material by adopting a solution blending method and a calcining method, and specifically comprises the following steps:
1) dispersing the biomass material in a precooled sodium hydroxide/urea/water solution, and sequentially stirring and carrying out centrifugal defoaming to obtain a transparent solution I;
2) dispersing the transparent solution I in a graphene oxide solution, adding organic diamine, performing magnetic stirring at normal temperature, and performing centrifugal separation to obtain a precipitate;
3) washing the precipitate obtained in the step 2) with water, and freeze-drying to obtain a solid block;
4) calcining the solid block obtained in the step 3) in an inert atmosphere, and then naturally cooling to obtain a graphene composite nitrogen and oxygen co-doped biomass carbon material; the material is of a sheet structure and has folds and regular lattice stripes, wherein the content of nitrogen is 2.0-5.0 at.%, and the content of oxygen is 3.0-7.0 at.%;
the mass ratio of the graphene oxide to the biomass material in the step 2) is 1 (25-100).
2. The method of claim 1, wherein the biomass is cotton, silk or chitin.
3. The preparation method according to claim 1, wherein the precooling temperature in the step 1) is-10 to-15 ℃.
4. The method according to claim 1, wherein the mass ratio of the sodium hydroxide, the urea and the water in the sodium hydroxide/urea/water solution is 1 (1-3) to (8-12).
5. The preparation method according to claim 1, wherein the concentration of the graphene oxide solution in the step 2) is 4-5 mg/mL.
6. The method for preparing the diamine compound of claim 1, wherein the organic diamine in the step 2) is one or more of ethylenediamine, propylenediamine, 1, 4-butylenediamine, 1, 5-pentylenediamine and hexylenediamine.
7. The preparation method according to claim 1, wherein the mass ratio of the graphene oxide to the organic amine in the step 2) is 1 (0.5-5).
8. The preparation method according to claim 1, wherein the calcination process is: firstly, heating to 300-400 ℃, preserving heat for 0.5-3 h, then heating to 600-1000 ℃, and preserving heat for 2-4 h.
9. The graphene composite nitrogen and oxygen co-doped biomass carbon material prepared by the preparation method of any one of claims 1 to 8 is in a sheet structure and has folds and regular lattice stripes, wherein the content of nitrogen is 2.0 to 5.0at.%, and the content of oxygen is 3.0 to 7.0 at.%.
CN201810245373.3A 2018-03-23 2018-03-23 Graphene composite nitrogen and oxygen co-doped biomass carbon material and preparation method thereof Active CN108539149B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810245373.3A CN108539149B (en) 2018-03-23 2018-03-23 Graphene composite nitrogen and oxygen co-doped biomass carbon material and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810245373.3A CN108539149B (en) 2018-03-23 2018-03-23 Graphene composite nitrogen and oxygen co-doped biomass carbon material and preparation method thereof

Publications (2)

Publication Number Publication Date
CN108539149A CN108539149A (en) 2018-09-14
CN108539149B true CN108539149B (en) 2021-07-13

Family

ID=63483651

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810245373.3A Active CN108539149B (en) 2018-03-23 2018-03-23 Graphene composite nitrogen and oxygen co-doped biomass carbon material and preparation method thereof

Country Status (1)

Country Link
CN (1) CN108539149B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109950520B (en) * 2019-03-15 2022-05-31 深圳市本征方程石墨烯技术股份有限公司 Nitrogen-containing graphene-coated biomass carbon negative electrode material and preparation method thereof
CN111082016A (en) * 2019-12-24 2020-04-28 武汉工程大学 Sulfur and oxygen co-doped biomass carbon/graphene composite material and preparation method and application thereof
CN113659143A (en) * 2021-08-06 2021-11-16 东莞市创明电池技术有限公司 Preparation method of negative electrode material of sodium ion battery, negative electrode material and sodium ion battery

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104356421A (en) * 2014-11-11 2015-02-18 亳州师范高等专科学校 Cellulose-based composite material with three-dimensional porous structure and preparation method of cellulose-based composite material
CN106024199A (en) * 2016-05-20 2016-10-12 华南理工大学 Bagasse full component/graphene carbon composite conductive material and preparation method therefor
CN106395803A (en) * 2016-09-09 2017-02-15 福州大学 Biomass auxiliary preparation method and application of nitrogen doped graphene
CN106513027A (en) * 2016-09-30 2017-03-22 浙江理工大学 Cellulose based three dimensional porous g-C3N4/C aerogel and preparation method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105601755A (en) * 2015-11-05 2016-05-25 深圳多元拓展环保科技有限公司 Preparation method and application method of cellulose xanthogenate heavy metal capturing agent
CN105552371B (en) * 2016-01-20 2017-12-08 福州大学 The preparation and application of nitrogen-doped graphene carbon nanohorn composite
CN106517157B (en) * 2016-10-28 2020-11-06 华北电力大学 Preparation method and application of nitrogen-doped carbon nanofiber/graphene aerogel
CN106587019B (en) * 2016-12-16 2018-07-17 武汉工程大学 A kind of preparation method of lignin-base biological carbon/graphene composite nano material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104356421A (en) * 2014-11-11 2015-02-18 亳州师范高等专科学校 Cellulose-based composite material with three-dimensional porous structure and preparation method of cellulose-based composite material
CN106024199A (en) * 2016-05-20 2016-10-12 华南理工大学 Bagasse full component/graphene carbon composite conductive material and preparation method therefor
CN106395803A (en) * 2016-09-09 2017-02-15 福州大学 Biomass auxiliary preparation method and application of nitrogen doped graphene
CN106513027A (en) * 2016-09-30 2017-03-22 浙江理工大学 Cellulose based three dimensional porous g-C3N4/C aerogel and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
新型石墨烯基氮掺杂多孔碳复合材料的制备及其超电容应用;罗华星;《中国优秀硕士学位论文数据库 工程科技Ⅰ辑》;20160331;第1页，第17-19页 *

Also Published As

Publication number Publication date
CN108539149A (en) 2018-09-14

Similar Documents

Publication Publication Date Title
CN108232151B (en) High-capacity composite negative electrode material, preparation method and lithium ion battery comprising high-capacity composite negative electrode material
US9437870B2 (en) Nano-silicon composite lithium ion battery anode material coated with poly (3,4-ethylenedioxythiophene) as carbon source and preparation method thereof
CN113044827B (en) Nano carbon material composite biomass hard carbon electrode material and preparation method and application thereof
Zhu et al. A free-standing nitrogen-doped porous carbon foam electrode derived from melaleuca bark for lithium-sulfur batteries
CN108539149B (en) Graphene composite nitrogen and oxygen co-doped biomass carbon material and preparation method thereof
CN106384825A (en) Silicon carbon composite microsphere, and preparation method and application thereof
KR20140120861A (en) Graphite negative electrode material for lithium ion batteries and preparing method thereof
CN108183039B (en) Preparation method of carbon-modified titanium niobate material, lithium ion capacitor and negative electrode slurry thereof
CN1837057A (en) Li4Ti5O12 materials with spinel structure and preparation process and use thereof
Wang et al. Fabrication of boron-doped porous carbon with termite nest shape via natural macromolecule and borax to obtain lithium-sulfur/sodium-ion batteries with improved rate performance
CN108807892A (en) A kind of preparation method of asphaltic base silicon-carbon nanometer sheet lithium cell negative pole material
CN112366306B (en) Nano silicon composite negative electrode material and manufacturing method thereof
CN110707323A (en) Anion layer-expanding carbon material and preparation method and application thereof
CN112320784B (en) Sulfur-doped iron-nitrogen-carbon supercapacitor electrode material and preparation method and application thereof
CN110942922B (en) One-step method for synthesizing porous MnO/C microspheres for supercapacitor electrode material
CN110895999A (en) Porous graphene-enhanced supercapacitor and preparation method thereof
Cheng et al. Hazel shell-based biomass-derived carbon modified diaphragm for high-performance lithium-sulfur batteries
CN116216693A (en) Ammonium phosphate salt doped modified asphalt-based hard carbon anode material and preparation method thereof
Yang et al. Preparation and electrochemical properties of Si@ C/CNTs composites derived from crosslinked chitosan
CN114050248B (en) MXene/MnO x Electrostatic spinning preparation method of nanofiber
CN112397705B (en) Lithium ion battery cathode material and preparation method and application thereof
CN111082016A (en) Sulfur and oxygen co-doped biomass carbon/graphene composite material and preparation method and application thereof
CN110120506B (en) Preparation method of graphite silicon nano composite material
KR101315486B1 (en) The method for manufacturing the high conductive carbon nano fiber and the carbon nano fiber made thereby
CN113120897A (en) Method for preparing nitrogen-doped microporous carbon electrode material by solvent-free method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20230511

Address after: Room 4, Room 1-5, 10th Floor, Research and Development Building, No. 7, Phase III, Modern International Design City, No. 41 Guanggu Avenue, Guandong Street, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430223 (Wuhan Free Trade Zone)

Patentee after: Wuhan Qina New Energy Technology Co.,Ltd.

Address before: 430074, No. 693 Xiong Chu street, Hongshan District, Hubei, Wuhan

Patentee before: WUHAN INSTITUTE OF TECHNOLOGY