CN113716548B - Preparation method of carbon aerogel and precursor thereof - Google Patents
Preparation method of carbon aerogel and precursor thereof Download PDFInfo
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- CN113716548B CN113716548B CN202111192443.1A CN202111192443A CN113716548B CN 113716548 B CN113716548 B CN 113716548B CN 202111192443 A CN202111192443 A CN 202111192443A CN 113716548 B CN113716548 B CN 113716548B
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Abstract
Disclosed is a preparation method of carbon aerogel and a precursor thereof, which comprises the steps of carrying out sol-gel reaction at a first temperature of a first raw material mixed solution to obtain a first carbon aerogel precursor, adding the first carbon aerogel precursor into a melamine formaldehyde resin solution, replacing fillers in a gel framework of the first carbon aerogel precursor with melamine formaldehyde resin to obtain a pre-cured target carbon aerogel precursor, drying and pyrolyzing the pre-cured target carbon aerogel precursor to obtain the carbon aerogel. The pre-cured target carbon aerogel obtained by the preparation method of the carbon aerogel and the precursor thereof has high strength of the skeleton structure, reduces the process requirements of the carbon aerogel precursor on the drying process, reduces the process cost, improves the production efficiency, and provides convenience for the industrial production of the carbon aerogel.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a preparation method of carbon aerogel and a precursor thereof.
Background
The carbon aerogel is a solid substance form, and is a porous carbon material taking a nano porous network structure formed by mutually agglomerating colloidal particles or high polymer molecules as a precursor.
Carbon aerogels have excellent structures, making them widely used in a variety of fields. For example, the carbon aerogel has the performances of ultralow density, high specific surface area, high porosity, excellent heat insulation and the like, and has wide application in the aspects of super heat insulation, sound insulation materials and the like; the carbon aerogel has the characteristic of good conductivity and is an ideal electrode material for preparing double-electric-layer capacitors and new energy batteries; the carbon aerogel has the biocompatibility and can be used for manufacturing artificial biological tissues, artificial organs and organ components, medical diagnostic agents and drug carriers of parenteral administration systems; the carbon aerogel has controllable high specific surface area and pore diameter, so that the carbon aerogel can be used as an excellent adsorbent for sewage treatment, seawater desalination, hydrogen storage materials and the like.
Currently, most carbon aerogels are prepared by carbonizing organic precursors. Almost all aerogels made from organic precursors suffer from capillary forces associated with liquid surface tension during drying, which results in channel collapse and skeletal fractures. In order to prevent the collapse of the pore channels and the fracture of the framework in the drying process, the organic aerogel precursor is generally dried by solvent replacement, supercritical drying, freeze drying and the like.
The preparation processes of solvent replacement, supercritical drying, freeze drying and other modes are complex, time-consuming, high in cost and difficult in large-scale production.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for preparing a carbon aerogel and a precursor thereof, so as to improve the structural strength of the framework of the carbon aerogel precursor, reduce the requirements of drying the carbon aerogel precursor on the process, reduce the process cost, and facilitate large-scale industrial production.
According to an aspect of the present invention, there is provided a method for preparing a carbon aerogel precursor, comprising:
mixing at least one phenolic series compound, formaldehyde, at least one first type catalyst and a solvent to obtain a first raw material mixed solution;
heating the first raw material mixed solution to a first temperature, and reacting at the first temperature to obtain a first carbon aerogel precursor;
and adding the first carbon aerogel precursor into a melamine formaldehyde resin solution, stirring and standing for the first time to obtain the target carbon aerogel precursor.
Optionally, the molar ratio of the phenolic compound to the formaldehyde in the first raw material mixed solution is 1: 1-4, and the molar ratio of the phenolic compound to the first catalyst is 100-500: 1.
Optionally, the molar ratio of the phenolic compound to the formaldehyde in the first raw material mixed solution is 1: 1-2, and the molar ratio of the phenolic compound to the first catalyst is 300-400: 1.
Optionally, in the step of adding the first carbon aerogel precursor into the melamine formaldehyde resin solution, the mass ratio of the melamine formaldehyde resin to the first carbon aerogel precursor in the melamine formaldehyde resin solution is 1: 1-3.
Optionally, in the step of adding the first carbon aerogel precursor into the melamine formaldehyde resin solution, a mass ratio of the melamine formaldehyde resin to the first carbon aerogel precursor in the melamine formaldehyde resin solution is 1: 1-2.
Optionally, the first temperature is 30 to 150 ℃.
Optionally, the at least one phenolic-series compound comprises at least one of resorcinol, catechol, phenol and its homologues, bisphenol a and its homologues, creosol and its homologues.
Optionally, the first type of catalyst comprises any one of an acid catalyst and a base catalyst.
Optionally, the acid catalyst comprises at least one of hydrochloric acid, nitric acid, sulfuric acid, acetic acid;
the alkali catalyst comprises at least one of potassium hydroxide, potassium carbonate, sodium hydroxide, sodium carbonate and calcium hydroxide.
Optionally, in the step of obtaining the target carbon aerogel precursor, water between the three-dimensional network of the first carbon aerogel precursor is replaced with melamine formaldehyde resin.
Optionally, the three-dimensional network structure of the target carbon aerogel precursor obtained is maintained intact.
Optionally, the method further comprises:
mixing melamine, formaldehyde, at least one second catalyst and a solvent to obtain a second raw material mixed solution;
and heating the mixed solution of the second raw material to a second temperature, and reacting and dissolving melamine at the second temperature to obtain the melamine formaldehyde resin solution.
Optionally, the molar ratio of the melamine to the formaldehyde in the second raw material mixed solution is 1: 2 to 6, and the molar ratio of the phenol series compound to the second type catalyst is 50 to 200: 1.
Optionally, the molar ratio of the melamine to the formaldehyde in the second raw material mixed solution is 1: 3 to 4, and the molar ratio of the phenol series compound to the second type catalyst is 100 to 150: 1.
Optionally, the second temperature is 60 to 90 degrees celsius.
Optionally, the second type of catalyst comprises any one of an acid catalyst and a base catalyst.
Optionally, the acid catalyst comprises at least one of hydrochloric acid, nitric acid, sulfuric acid, acetic acid;
the alkali catalyst comprises at least one of potassium hydroxide, potassium carbonate, sodium hydroxide, sodium carbonate and calcium hydroxide.
According to another aspect of the present invention, there is provided a method for preparing a carbon aerogel, comprising:
the carbon aerogel precursor is prepared by the preparation method of the carbon aerogel precursor;
drying the carbon aerogel precursor to obtain a carbon xerogel;
and pyrolyzing and carbonizing the carbon xerogel to obtain the carbon aerogel.
Optionally, the step of drying the carbon aerogel precursor to obtain a carbon xerogel comprises:
drying the carbon aerogel precursor at atmospheric pressure at a third temperature to obtain the carbon xerogel.
Optionally, the step of pyrolytically carbonizing the carbon xerogel comprises:
and (3) placing the carbon xerogel in an inert gas environment, and preserving the heat for 1-5 hours at the temperature of 700-1100 ℃ to obtain the carbon aerogel.
Optionally, the pore size of the obtained carbon aerogel is 2-200 nm.
Optionally, the third temperature is 100 to 160 ℃.
Optionally, the third temperature is 130 to 150 ℃.
According to the preparation method of the carbon aerogel precursor, the first raw material mixed solution is subjected to a sol-gel reaction to prepare the first carbon aerogel precursor, the first carbon aerogel precursor is added into the melamine formaldehyde resin solution, the melamine formaldehyde resin replaces a solvent between frameworks of the first carbon aerogel precursor, and the target carbon aerogel precursor is obtained through pre-curing, so that the structural stability of the obtained target carbon aerogel precursor is improved, the requirements of drying the carbon aerogel precursor on the process are reduced, and convenience is brought to the production of the carbon aerogel.
According to the preparation method of the carbon aerogel, the carbon aerogel precursor obtained by the preparation method of the carbon aerogel precursor is dried, pyrolyzed and carbonized, the framework stability of the carbon aerogel precursor is good, the technological requirement on drying operation is low, the integrity of the three-dimensional network structure of the dried carbon xerogel can be ensured under lower technological conditions, the technological cost is reduced, and the structural characteristics of the finally obtained carbon aerogel are ensured.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a flow diagram of a method for preparing a carbon aerogel according to an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
Fig. 1 shows a flow chart of a method for preparing a carbon aerogel according to an embodiment of the present invention.
Referring to fig. 1, the preparation method of the carbon aerogel according to the embodiment of the present invention mainly includes:
step S10: mixing at least one phenolic series compound, formaldehyde, at least one first type catalyst and a solvent to obtain a first raw material mixed solution.
Wherein, in the first raw material mixed liquid, the molar ratio of the phenolic series compound to the formaldehyde is 1: 1-4 (further, 1: 1-2), and the molar ratio of the phenolic series compound to the first type catalyst is 100-500: 1 (further, 300-400: 1).
In this embodiment, the at least one phenolic compound in the first raw material mixed solution includes at least one of resorcinol, catechol, phenol and its homologues, bisphenol a and its homologues, mixed cresol and its homologues, the first catalyst includes any one of an acid catalyst and a base catalyst, the acid catalyst includes at least one of hydrochloric acid, nitric acid, sulfuric acid, and acetic acid, the base catalyst includes at least one of potassium hydroxide, potassium carbonate, sodium hydroxide, sodium carbonate, and calcium hydroxide, and the solvent is deionized water.
Step S11: and heating the first raw material mixed liquid to a first temperature, and reacting at the first temperature to obtain a first carbon aerogel precursor.
In this embodiment, the first temperature is 30 to 150 degrees celsius, and the first raw material mixed solution undergoes a sol-gel reaction at the first temperature to obtain the first carbon aerogel precursor.
Step S20: and mixing melamine, formaldehyde, at least one second catalyst and a solvent to obtain a second raw material mixed solution.
The mol ratio of the melamine to the formaldehyde in the second raw material mixed solution is 1: 2-6 (further, 1: 3-4); the molar ratio of the phenolic series compound to the second type catalyst is 50-200: 1 (further 100-150: 1), the second type catalyst comprises any one of an acid catalyst and a base catalyst, the acid catalyst comprises at least one of hydrochloric acid, nitric acid, sulfuric acid and acetic acid, the base catalyst comprises at least one of potassium hydroxide, potassium carbonate, sodium hydroxide, sodium carbonate and calcium hydroxide, and the solvent is deionized water.
Step S21: and heating the second raw material mixed solution to a second temperature, and reacting and dissolving melamine at the second temperature to obtain a melamine formaldehyde resin solution.
In this embodiment, the second temperature is 60 to 90 degrees celsius, the second raw material mixed solution is heated in a water bath to the second temperature, and is kept for tens of minutes, and the melamine formaldehyde resin solution is obtained by mechanically stirring for tens of minutes, wherein the melamine formaldehyde resin solution includes a melamine formaldehyde dimer or polymer.
Step S30: and adding the first carbon aerogel precursor into the melamine formaldehyde resin solution, stirring and standing for 5-24 hours to obtain the target carbon aerogel precursor.
In step S30, after the first carbon aerogel precursor is added to the melamine formaldehyde resin solution, mechanical stirring is performed, and the mixture is allowed to stand for 5 to 24 hours (first time), the melamine formaldehyde resin replaces water to fill the space between the gel frameworks of the first carbon aerogel precursor, so that the water between the three-dimensional network structures of the first carbon aerogel precursor is replaced by the melamine formaldehyde resin, and the target carbon aerogel precursor is obtained.
In this example, the mass ratio of the melamine formaldehyde resin to the first carbon aerogel precursor in the melamine formaldehyde resin solution was 1: 1 to 3 (further, 1: 1 to 2).
Step S31: the target carbon aerogel precursor was dried to obtain a carbon xerogel.
In step S31, the target carbon aerogel precursor is dried at a temperature of 100 to 160 degrees celsius (a third temperature, which is further 130 to 150 degrees celsius), pre-cured, and deep-cured to obtain a carbon xerogel with a complete three-dimensional network skeleton.
Step S32: and pyrolyzing the carbonized carbon xerogel to obtain the carbon aerogel.
In step S32, the carbon xerogel is placed in an inert gas environment, and is kept at 700-1100 ℃ for 1-5 hours to obtain the carbon aerogel, and the carbon aerogel is taken out after being cooled to room temperature.
The obtained carbon aerogel comprises mesopores and macropores, wherein the pore diameter is between 2 and 200 nanometers, the pore diameter of the mesopores is mainly distributed between 2 and 20 nanometers, and the pore diameter of the macropores is mainly distributed between 50 and 200 nanometers.
A partial example of a method of preparing a carbon aerogel according to an embodiment of the present invention is shown below.
Example l
The first step is to prepare 100g of 20% resorcinol aqueous solution in a closed reactor, add 16g formaldehyde solution (mass fraction is 37%) and 0.05g nitric acid, mechanically stir for 30min, heat to 70 ℃ in a water bath, and heat for 72h to obtain a carbon aerogel precursor (first carbon aerogel precursor).
And secondly, adding 12g of melamine powder into a closed reactor, adding 24g of formaldehyde solution (the mass fraction is 37%) and 0.08g of sodium carbonate, heating to 70 ℃ in a water bath, keeping the temperature for 30min, and mechanically stirring for 5min to obtain melamine-formaldehyde polymer (MF, also called melamine formaldehyde resin, melamine formaldehyde resin and melamine resin) solution.
And thirdly, adding the carbon aerogel precursor into the melamine-formaldehyde polymer solution, mechanically stirring for 30min, and standing for 10h to obtain the MF-cured carbon aerogel precursor (the target carbon aerogel precursor).
The fourth step: the MF solidified carbon aerogel precursor is directly dried at 140 ℃ under normal pressure to obtain carbon xerogel.
The fifth step: and (3) preserving the heat of the carbon xerogel in nitrogen gas for 5 hours at 900 ℃, and cooling to room temperature to obtain the carbon aerogel. The specific surface area of the carbon aerogel sample is 900m 2 G, density 0.21g/cm 3 The aperture of the mesopore is 10nm, and the aperture of the macropore is 60nm.
Example 2
The first step is that 9.5g of phenol, 75g of deionized water, 16g of formaldehyde solution (the mass fraction is 37%) and 0.03g of sodium carbonate are added into a closed reactor, mechanical stirring is carried out for 20min, the temperature is raised to 90 ℃ in a water bath, and heating is carried out for 72h, thus obtaining the carbon aerogel precursor.
And secondly, adding 10g of melamine powder into a closed reactor, adding 21g of formaldehyde solution (the mass fraction is 37%) and 0.06g of sodium hydroxide, heating to 70 ℃ in a water bath, keeping the temperature for 20min, and mechanically stirring for 5min to obtain melamine-formaldehyde polymer solution (MF).
And thirdly, adding the carbon aerogel precursor into the melamine-formaldehyde polymer solution, mechanically stirring for 30min, and standing for 12h to obtain the MF-cured carbon aerogel precursor.
The fourth step: the MF solidified carbon aerogel precursor is directly dried at 150 ℃ under normal pressure to obtain carbon xerogel.
The fifth step: and (3) preserving the heat of the carbon xerogel in nitrogen gas for 5 hours at 950 ℃, and cooling to room temperature to obtain the carbon aerogel. The specific surface area of the carbon aerogel sample is 1000m 2 A density of 0.19g/cm 3 The aperture of the mesopores is 15nm, and the aperture of the macropores is 70nm.
Example 3
The first step is that 4.5g of phenol, 5.5g of resorcinol, 80g of deionized water, 15g of formaldehyde solution (the mass fraction is 37%) and 0.03g of hydrochloric acid are added into a closed reactor, mechanical stirring is carried out for 25min, the temperature is raised to 80 ℃ in a water bath, and heating is carried out for 65h, so as to obtain the carbon aerogel precursor.
And secondly, adding 13g of melamine powder into a closed reactor, adding 26g of formaldehyde solution (with the mass fraction of 37%) and 0.07g of potassium hydroxide, heating to 85 ℃ in a water bath, keeping for 30min, and mechanically stirring for 10min to obtain melamine-formaldehyde polymer solution (MF).
And thirdly, adding the carbon aerogel precursor into the melamine-formaldehyde polymer solution, mechanically stirring for 35min, and standing for 9h to obtain the MF-cured carbon aerogel precursor.
The fourth step: the MF-solidified carbon aerogel precursor is directly dried at 140 ℃ under normal pressure to obtain carbon xerogel.
The fifth step: and (3) preserving the heat of the carbon xerogel in nitrogen gas for 4 hours at 850 ℃, and cooling to room temperature to obtain the carbon aerogel. The specific surface area of the carbon aerogel sample is 950m 2 G, density 0.22g/cm 3 The aperture of the mesopore is 13nm, and the aperture of the macropore is 60nm.
Example 4
The first step is that 5.5g of mixed cresol, 5.5g of resorcinol, 90g of deionized water, 14g of formaldehyde solution (the mass fraction is 37%) and 0.05g of potassium hydroxide are added into a closed reactor, mechanical stirring is carried out for 25min, the temperature is raised to 85 ℃ in a water bath, and heating is carried out for 75h, so as to obtain the carbon aerogel precursor.
And secondly, adding 15g of melamine powder into a closed reactor, adding 30g of formaldehyde solution (the mass fraction is 37%) and 0.03g of potassium hydroxide, heating to 65 ℃ in a water bath, keeping the temperature for 30min, and mechanically stirring for 10min to obtain melamine-formaldehyde polymer solution (MF).
And thirdly, adding the carbon aerogel precursor into the melamine-formaldehyde polymer solution, mechanically stirring for 30min, and standing for 11h to obtain the MF-cured carbon aerogel precursor.
The fourth step: the MF-cured carbon aerogel precursor is directly dried at 150 ℃ under normal pressure to obtain carbon xerogel.
The fifth step: and (3) preserving the heat of the carbon xerogel for 5 hours in nitrogen gas at the temperature of 1000 ℃, and cooling to room temperature to obtain the carbon aerogel. The specific surface area of the carbon aerogel sample is 1100m 2 G, density 0.18g/cm 3 The aperture of the mesopores is 16nm, and the aperture of the macropores is 100nm.
As can be seen from the foregoing examples 1 to 4, in the preparation method of the carbon aerogel according to the embodiment of the present invention, by adjusting the starting material components, the porous carbon parameters of the obtained carbon aerogel, such as pore morphology, pore size, and pore volume, can be adjusted and controlled, and the adjustment and control are convenient.
The preparation method of the carbon aerogel precursor comprises the steps of carrying out sol-gel reaction on a first raw material mixed solution to prepare a first carbon aerogel precursor, adding the first carbon aerogel precursor into a melamine formaldehyde resin solution, replacing a solvent between frameworks of the first carbon aerogel precursor with melamine formaldehyde resin, and pre-curing to obtain the target carbon aerogel precursor.
According to the preparation method of the carbon aerogel provided by the invention, the carbon aerogel precursor obtained by the preparation method of the carbon aerogel precursor is dried, pyrolyzed and carbonized, the skeleton stability of the carbon aerogel precursor is good, the technological requirement on drying operation is low, the integrity of the three-dimensional network structure of the dried carbon xerogel obtained under a lower drying technological condition can be conveniently ensured, the technological cost is reduced, and the structural characteristics of the finally obtained carbon aerogel, such as strength, toughness and the like, can be ensured.
And the template agent adopts polymers of melamine and formaldehyde, so that the price is low and the cost of raw materials is low.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (20)
1. A method of preparing a carbon aerogel precursor, comprising:
mixing at least one phenolic series compound, formaldehyde, at least one first type catalyst and a solvent to obtain a first raw material mixed solution;
heating the first raw material mixed solution to a first temperature, and reacting at the first temperature to obtain a first carbon aerogel precursor;
adding the first carbon aerogel precursor into a melamine formaldehyde resin solution, stirring and standing for a first time to obtain a target carbon aerogel precursor,
mixing melamine, formaldehyde, at least one second catalyst and a solvent to obtain a second raw material mixed solution; the mol ratio of melamine to formaldehyde in the second raw material mixed solution is 1: 2-6, and the mol ratio of the phenol series compound to the second catalyst is 50-200: 1;
heating the second raw material mixed solution to a second temperature, and reacting and dissolving melamine at the second temperature to obtain a melamine formaldehyde resin solution; the second temperature is 60-90 ℃.
2. The method of preparing a carbon aerogel precursor of claim 1,
the mol ratio of the phenolic compounds to the formaldehyde in the first raw material mixed liquid is 1: 1-4, and the mol ratio of the phenolic compounds to the first catalyst is 100-500: 1.
3. The method of preparing a carbon aerogel precursor of claim 2,
the molar ratio of the phenolic compounds to the formaldehyde in the first raw material mixed liquid is 1: 1-2, and the molar ratio of the phenolic compounds to the first catalyst is 300-400: 1.
4. The method of preparing a carbon aerogel precursor of claim 1,
in the step of adding the first carbon aerogel precursor into the melamine formaldehyde resin solution, the mass ratio of the melamine formaldehyde resin to the first carbon aerogel precursor in the melamine formaldehyde resin solution is 1: 1-3.
5. The method of preparing a carbon aerogel precursor according to claim 4,
in the step of adding the first carbon aerogel precursor into the melamine formaldehyde resin solution, the mass ratio of the melamine formaldehyde resin to the first carbon aerogel precursor in the melamine formaldehyde resin solution is 1: 1-2.
6. The method of preparing a carbon aerogel precursor of claim 1,
the first temperature is 30-150 ℃.
7. The method of preparing a carbon aerogel precursor according to claim 1,
the at least one phenolic compound comprises at least one of resorcinol, catechol, phenol and its homologues, bisphenol A and its homologues, and cresol and its homologues.
8. The method of preparing a carbon aerogel precursor according to claim 1,
the first type of catalyst includes any one of an acid catalyst and a base catalyst.
9. The method of preparing a carbon aerogel precursor of claim 8,
the acid catalyst comprises at least one of hydrochloric acid, nitric acid, sulfuric acid and acetic acid;
the alkali catalyst comprises at least one of potassium hydroxide, potassium carbonate, sodium hydroxide, sodium carbonate and calcium hydroxide.
10. The method of preparing a carbon aerogel precursor according to claim 1,
in the step of obtaining the target carbon aerogel precursor, water between the three-dimensional network of the first carbon aerogel precursor is replaced with melamine formaldehyde resin.
11. The method of preparing a carbon aerogel precursor according to claim 10,
the three-dimensional network structure of the target carbon aerogel precursor obtained is maintained intact.
12. The method of preparing a carbon aerogel precursor of claim 1,
the mol ratio of the melamine to the formaldehyde in the second raw material mixed liquid is 1: 3-4, and the mol ratio of the phenol series compound to the second catalyst is 100-150: 1.
13. The method of preparing a carbon aerogel precursor of claim 1,
the second type of catalyst includes any one of an acid catalyst and a base catalyst.
14. The method of preparing a carbon aerogel precursor of claim 13,
the acid catalyst comprises at least one of hydrochloric acid, nitric acid, sulfuric acid and acetic acid;
the alkali catalyst comprises at least one of potassium hydroxide, potassium carbonate, sodium hydroxide, sodium carbonate and calcium hydroxide.
15. A method for preparing a carbon aerogel, comprising:
preparing a carbon aerogel precursor using the carbon aerogel precursor preparation process of any of claims 1-14;
drying the carbon aerogel precursor to obtain a carbon xerogel;
and pyrolyzing and carbonizing the carbon xerogel to obtain the carbon aerogel.
16. The method of preparing a carbon aerogel of claim 15, wherein said step of drying said carbon aerogel precursor to obtain a carbon xerogel comprises:
drying the carbon aerogel precursor at atmospheric pressure at a third temperature to obtain the carbon xerogel.
17. The method of preparing the carbon aerogel of claim 15, wherein said step of pyrolytically carbonizing said carbon xerogel comprises:
and placing the carbon xerogel in an inert gas environment, and preserving the heat for 1-5 hours at the temperature of 700-1100 ℃ to obtain the carbon xerogel.
18. The method of preparing a carbon aerogel of claim 15,
the pore size of the obtained carbon aerogel is 2-200 nanometers.
19. The method of preparing a carbon aerogel according to claim 16,
the third temperature is 100-160 ℃.
20. The method of preparing a carbon aerogel of claim 19,
the third temperature is 130-150 ℃.
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