CN114933300A - Graphene foam support with high specific surface area - Google Patents
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Abstract
The invention belongs to the technical field of graphene materials, and provides a preparation method of a graphene foam scaffold. According to the preparation method provided by the invention, the carbonate and the sodium bicarbonate are used as filling main materials, so that the high porosity is conveniently obtained by acid solution cleaning, the specific surface area is larger than that of a 3D graphene film, and more loadable sites are exposed; compared with the traditional preparation method of the graphene aerogel, the preparation method has the advantages of simple preparation process, suitability for large-scale industrial mass production, low manufacturing cost and the like.
Description
Technical Field
The invention relates to the field of graphene materials, in particular to a graphene foam support with a high specific surface area.
Background
Graphene is a novel material with excellent optical, thermal, electrical and mechanical properties, and is widely concerned by scientists. At present, the graphene composite material has already begun to be commercially applied in the field of thermal management, such as graphene heat conducting films and graphene temperature equalization plates on electronic products with famous brands, such as Huashi, millet, apple and the like, and the research and development of high-performance graphene conductive agents and graphene super capacitors in the field of electricity also obtain happy peopleAnd (4) achievement. In many application fields, the electrical and thermal properties of graphene are considered, and the high specific surface area of graphene is also a factor of great concern. The graphene has an ultrahigh specific surface area, and the high specific surface area can improve a large number of load sites, and has great application potential in the field of high-load application materials, such as photoelectrocatalysis, supercapacitors, material modification and other fields. However, the high specific surface area of graphene is difficult to be fully used in many cases, which is mainly due to the fact that the graphene is stacked layer by layer, self-polymerization coating and the like cause the reduction of exposed loadable sites, such as self-polymerization film formation of graphene oxide, the area of graphene which can be exposed and loaded is greatly reduced, and the graphene SP 2 Hybrid six-membered ring structure, none of its effective pores being capable of letting Li of minimum ionic radius + By, let alone small molecule materials.
In many applications, it is desirable that the reaction substance be transported to the active site on the graphene surface for reaction. Generally, small molecules or ions can only be transported and shuttled in graphene stacked layer by layer along interlayer gaps and local holes of the graphene, so that the transport path of the small molecules or ions of lithium is greatly increased, and a great steric hindrance phenomenon is shown. Graphene can also be obtained from 3D graphene with high specific surface area and less steric hindrance, such as graphene aerogel, by certain means. However, the graphene aerogel preparation process is very long in load and time, cannot prepare large areas, is low in efficiency and high in cost, and the aerogel is poor in conductivity and cannot fully exert the electrical properties of graphene. The invention provides a graphene foam support with a large specific surface area, which can be prepared in a large area, and aims to solve the steric hindrance of film-shaped graphene, construct a rapid channel for material transportation during working, fully release loadable sites of the graphene, promote the application of the graphene in the field of load application materials, such as photocatalysis and photocatalysis, and provide a conductive support with a high specific surface area and a high load effect for functional materials such as catalysis and the like.
Disclosure of Invention
In order to solve the defects in the prior art, the invention mainly aims to provide a preparation method of a graphene foam scaffold with a high specific surface area, which mainly comprises the following steps:
mixing sodium carbonate or sodium bicarbonate as a filling material, adding reduced graphene oxide after mixing and dispersing uniformly, coating the mixture into a film, drying the film, and soaking the film into acid liquor to remove the filling material to obtain the graphene foam scaffold.
The preparation method comprises the following steps:
step 1: selecting sodium carbonate or sodium bicarbonate subjected to drying and water removal treatment as a filling material; carbonate removed by the reaction of solutions such as sodium carbonate and sodium bicarbonate and acid liquor is selected as a main filling material of the high-surface-area graphene foam scaffold, and the particle size of the main filling material can be selected according to the designed pores of the graphene foam scaffold.
Step 2: preparing an adhesive dispersion liquid, mixing the adhesive and the solvent, stirring and dispersing, wherein the stirring speed is set to be 600-2000r/min, and preparing the adhesive dispersion liquid with the mass fraction of 0.1-3%. According to the flexibility design requirement of the graphene foam support, binders are selected, such as rigid graphene foam supports, binders such as hard PVDF and CMC, and flexible and elastic graphene foam supports, binders such as flexible PMMA and epoxy resin, and can also be used in a compounding manner. Selecting oil auxiliary solvents such as NMP, DMF, xylene and the like according to the properties of the filling main material and the binder; the filling carbonate in the membrane material is selectively removed by utilizing the characteristic that the oily binder is insoluble in water.
And step 3: preparing coating slurry, mixing 95-99% of filling material and 0.1-3% of binder according to mass percent, fully and uniformly stirring, adding 0.1-2% of graphene functional powder, and dispersing at high speed to obtain the coating slurry. Selecting graphene functional materials according to design requirements, such as reduced graphene oxide powder, aminated graphene powder, element-doped graphene powder, graphene oxide powder and the like.
And 4, step 4: coating to form a film, coating the coating slurry on a substrate after viscosity adjustment, and drying to obtain a coating layer; the viscosity is adjusted by adding an auxiliary solvent to control the viscosity of the slurry within the range of 2000-10000 mPa.s. The prepared slurry is coated on PE, PET, PP or a target substrate or filled in a special mold, and is transferred to an oven for drying at 60-150 ℃.
And 5: and soaking in acid liquor to remove the filling material, immersing the dried sample in a prepared acidic solution with the mass fraction of 1-15%, removing the carbonate filling main material in the sample in an acid etching mode, washing with deionized water for multiple times, and drying to obtain the graphene foam support constructed by graphene and the binder.
And 6: a portion of the sample was cut for BET testing to obtain specific surface area data for the sample, and the resistivity of the sample was measured using a four-probe resistance tester test.
In a further technical scheme, before the filling material is added, the filling material needs to be baked for 2 hours at the temperature of 80 ℃ to remove the moisture on the surface of the filling material.
In the further technical scheme, in the step of preparing the coating slurry, the graphene functional powder is placed in a vacuum drying oven at 150 ℃ for baking for at least 2 hours before being added, so that the moisture in the graphene functional powder is removed, and the problem of sedimentation in the subsequent pulping process is prevented.
In a further technical scheme, in the coating and film forming step, the thickness of the coating layer is XX-400 μm.
In a further technical scheme, in the step of removing the filling material by soaking in acid liquor, the acid liquor is hydrochloric acid with the mass fraction of 10%, the acid liquor is soaked until the coating layer does not generate bubbles and the pH of the acid liquor is still acidic, the graphene foam scaffold is obtained, and the graphene foam scaffold is washed by deionized water and then dried.
Compared with the prior art, the invention has the following beneficial effects:
1. the graphene foam scaffold with the high specific surface area has a larger specific surface area compared with a 3D graphene film, exposes more loadable sites, and is a loading material with excellent performance.
2. Compared with a common oxide 3D porous support, the graphene foam support with the high specific surface area provided by the invention has more ideal conductivity, can better conduct and excite carriers in the fields of photocatalysis, electrocatalysis and the like, and can be used as a load material with the high specific surface area in the fields of photocatalysis and electrocatalysis.
3. According to the graphene foam support with the high specific surface area, the steric hindrance problem of a layered graphene membrane is solved through a filling-etching strategy of a carbonate main material, and a rapid channel for transporting small molecular substances or ions is constructed by the remaining gaps; the carbonate and sodium bicarbonate are used as filling main materials, so that the high porosity can be conveniently obtained by cleaning acid solution, the process is simple, the manufacturing cost is low, the preparation with large area, controllable thickness and customized appearance can be carried out by coating and filling a die, and the method is suitable for industrial production.
4. According to the graphene foam support with the high specific surface area, provided by the invention, a proper binder can be selected according to design requirements to obtain graphene foam supports with different flexibility, rigidity and softness, and the pores of the graphene foam support can be controlled by selecting the particle size of the filling material to obtain graphene foam supports with different pore sizes, so that the graphene foam supports can be directly constructed on a target substrate and can be independently used, the graphene foam support with the high specific surface area has values in various places, and the application requirements of various practical scenes can be met.
Drawings
Fig. 1 is an SEM image of a sample of a graphene foam scaffold with a high specific surface area provided by the present invention.
Fig. 2 is an SEM image of a sample of a graphene foam scaffold with a high specific surface area provided by the present invention.
Fig. 3 is a BET test result of a graphene foam scaffold sample with a high specific surface area provided by the present invention.
Fig. 4 is a sample of the graphene foam scaffold obtained in example 3.
Detailed Description
The following examples are presented to further illustrate the present invention and should not be construed as limiting the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
The following are specific examples:
example 1
The invention provides a preparation method of a graphene foam scaffold with a high specific surface area, which comprises the following specific steps:
1) optional use of D 50 Baking sodium bicarbonate of =5 μm as a main filling material of the high-surface-area graphene foam scaffold at 80 ℃ for 2h, wherein the purpose is to remove the surface moisture of the sodium bicarbonate;
2) PVDF-5130 powder is selected as a binder, NMP is used as a solvent, and a digital display stirrer is used for stirring and dispersing under the condition of 600-2000r/min, so that the PVDF powder is fully dissolved, and a PVDF dispersion solution with the mass fraction of 4% is prepared for later use;
3) selecting NMP as an auxiliary solvent according to the properties of a filling main material and a binder for subsequent auxiliary mixing;
4) selecting common reduced graphene oxide powder as a functional material of a graphene foam bracket, and baking the reduced graphene oxide in a vacuum drying oven at 150 ℃ for more than 2h to remove water in the reduced graphene oxide powder and prevent the problem of sedimentation in the subsequent pulping process;
5) diluting the PVDF dispersion solvent with the mass fraction of 4 percent prepared in the step 2) into a PVDF diluted solution with the mass fraction of 1 percent by using NMP, dispersing at a high speed, and adding D with the mass fraction of 98.5 percent 50 Filling sodium bicarbonate with the particle size of =5 mu m into a main material, fully and uniformly stirring, adding 0.5% of reduced graphene oxide powder by mass fraction, dispersing at a high speed until the slurry state is smooth and has no granular feel, and controlling the viscosity of the slurry to be 4000mPa & S by adding a proper amount of NMP solvent subsequently.
6) Selecting a PET film as a coating substrate, wiping the PET film by using dust-free cloth, coating a coating layer with the thickness of 400 mu m on the PET film by using a four-side coater, and transferring a sample to an oven at 80 ℃ for drying after the coating is finished;
7) and immersing the dried sample in a prepared hydrochloric acid solution with the mass fraction of 10% for 2h, and removing the sodium bicarbonate filling main material in the sample in a hydrochloric acid etching mode until the sample does not generate bubbles any more and the solution is not acidic after the pH test paper test reaction, and determining that the reaction is finished. And (3) washing with deionized water until the pH value of the solution is neutral, and then transferring the edge of the graphene foam support to a vacuum oven at 80 ℃ for low-pressure drying after absorbing residual moisture by using dust-free paper to obtain the graphene foam support constructed by graphene and the binder.
8) The cut sample was subjected to BET test by static capacitance method, and the test result is shown in FIG. 3, which shows that the single point BET of the obtained graphene foam scaffold sample has 466.404m 2 The specific surface area per gram is tested by using a four-probe resistance tester, the resistivity of the graphene foam support is 22.3m omega cm, the microstructure is a structure similar to sponge, is different from a film-shaped 3D graphene film layer-by-layer stacking structure in nature, can construct a rapid channel for transporting small molecules and ions, is a conductive load support material with high specific surface area, and has great application potential in the application fields of load materials such as photocatalysis, electrocatalysis, adsorption and the like. A portion of the sample was taken to be observed under an electron microscope, and as shown in fig. 1 and 2, the sodium bicarbonate filler in the graphene foam scaffold left a large number of cavities due to acid washing.
Example 2
The difference between this example and example 1 is that step 5) uses NMP solvent to dilute the PVDF binder solution into 0.2% mass fraction PVDF dispersion solution, and the other steps are the same as example 1, and the purpose is to investigate the influence of the PVDF binder addition amount on the graphene foam scaffold performance. The results showed that the specific surface area of the sample was only 172.3m 2 The resistivity of the sample is 55.6m omega cm, which can be attributed to insufficient adhesive in the sample, collapse of the internal structure, and the connection of graphene is broken by a large amount of bubbles generated in heavy acid washing, so that the sheets are connected with each otherAnd multipoint electrical conduction breakpoints occur, so that the resistivity of the sample is higher.
Example 3
The present example is different from example 1 in that step 5) does not use NMP solvent for dilution, and uses 4% mass fraction of PVDF dispersant prepared in step 2) as an auxiliary solvent, and the other steps are the same as those in example 1, and the purpose of the present example is to study the influence of the addition amount of PVDF binder on the performance of graphene foam scaffold.
Samples prepared according to the methods of examples 1-3 were taken, and cut out for BET testing and resistivity testing using a four-probe resistance tester, the results of which are shown in the following table:
| examples | PVDF mass percent | Specific surface area | Resistivity of |
| 1 | 1% | 466.4m 2 /g | 22.3mΩ.cm |
| 2 | 0.2% | 172.3m 2 /g | 55.6mΩ.cm |
| 3 | 4% | 250.5m 2 /g | 118.7mΩ.cm |
The above test data show that the graphene foam scaffold sample prepared by the method of example 1 has a thickness of > 400m 2 The specific surface area per gram is tested by using a four-probe resistance tester, the resistivity of the graphene foam support is 22.3m omega cm, the microstructure is a structure similar to sponge, is different from a film-shaped 3D graphene film layer-by-layer stacking structure in nature, can construct a rapid channel for transporting small molecules and ions, is a conductive load support material with high specific surface area, and has great application potential in the application fields of load materials such as photocatalysis, electrocatalysis, adsorption and the like. The test result of the sample prepared by the method in the embodiment 2 shows that the graphene foam scaffold structure obtained by adding 0.2 mass percent of PVDF (polyvinylidene fluoride) binder has collapse and local large holes, and the BET test result is 172.3m 2 The volume ratio of the graphene oxide to the binder is/g, when the binder is not added enough, the graphene oxide cannot be supported to build a 3D porous graphene foam support, so that the holes are locally collapsed, and redundant graphene oxide is stacked and deposited on the surface of a sample. The test result of the sample prepared by the method in example 3 shows that the graphene foam bracket obtained by adding 4% of PVDF binder by mass fraction is hard, and the BET test result is 250.5m 2 And the resistivity test result is 118.7m omega cm, a part of the sample is taken to be observed under an electron microscope, and the microstructure is similar to a sponge, and is shown in figure 4. In combination with the observed SEM images and test results, this may be attributed to excessive binder addition, which, although better able to construct 3D porous graphene foam scaffolds, would reduce the exposable loading sites of graphene, reducing the specific surface area, while the non-conductive binder would also increase the resistivity of the samples.
Example 4
1) Optional use of D 50 Sodium bicarbonate of =5 μm as a main filler for high surface area graphene foam scaffold, and the main filler is baked at 80 ℃ for 2h for removing carbonSurface moisture of sodium hydrogen carbonate;
2) PVDF-900 powder is selected as a binder, NMP is used as a solvent, and a digital display stirrer is used for stirring and dispersing under the condition of 600-2000r/min, so that the PVDF powder is fully dissolved, and a PVDF dispersion solution with the mass fraction of 4% is prepared for later use;
3) selecting NMP as an auxiliary solvent according to the properties of a filling main material and a binder for subsequent auxiliary mixing;
4) selecting common reduced graphene oxide powder as a functional material of a graphene foam bracket, and baking the reduced graphene oxide in a vacuum drying oven at 150 ℃ for more than 2h to remove water in the reduced graphene oxide powder and prevent the problem of sedimentation in the subsequent pulping process;
5) diluting the PVDF dispersion solvent with the mass fraction of 4 percent prepared in the step 2) into a PVDF diluted solution with the mass fraction of 1 percent by using NMP, dispersing at a high speed, and adding D with the mass fraction of 98.5 percent 50 Filling a main material with sodium bicarbonate of which the particle size is not less than 5 microns, fully and uniformly stirring, adding 0.5% of reduced graphene oxide powder by mass fraction, dispersing at a high speed until the slurry state is smooth and has no granular sensation, and controlling the viscosity of the slurry to be 4000mPa & S by adding an appropriate amount of NMP solvent subsequently;
6) selecting a PET film as a coating substrate, wiping the PET film by using dust-free cloth, coating a coating layer with the thickness of 400 mu m on the PET film by using a four-side coater, and transferring a sample to an oven at 80 ℃ for drying after the coating is finished;
7) and immersing the dried sample in a prepared hydrochloric acid solution with the mass fraction of 10% for 2h, and removing the sodium bicarbonate filling main material in the sample in a hydrochloric acid etching mode until the sample does not generate bubbles any more and the solution is not acidic after the pH test paper test reaction, and determining that the reaction is finished. And (3) washing with deionized water until the pH value of the solution is neutral, and then transferring the edge of the graphene foam support to a vacuum oven at 80 ℃ for low-pressure drying after absorbing residual moisture by using dust-free paper to obtain the graphene foam support constructed by graphene and the binder.
This example differs from example 1 in that PVDF-900 was used in place of the PVDF-5130 binder of example 1 (both materials being conventional materials)Purchased from guangdong candlepower technologies, ltd), the other steps were the same as in example 1, and the purpose was to investigate the effect of the molecular weight of the binder on the performance of the graphene foam scaffold. The result shows that when PVDF-900 is used as a binder, the obtained graphene foam scaffold is soft and has certain elasticity, and the BET test result is 287.7m 2 The resistivity test result was 33.4 m.OMEGA.cm/g, which is attributable to the fact that intrinsic characteristics of the binder such as molecular weight are important factors affecting the properties of the sample, and at a lower molecular weight, although the number of molecules of the binder obtained is larger, there is a phenomenon of uneven bonding, resulting in an increase in the resistivity of the sample.
Example 5
1) Optional use of D 50 Baking sodium bicarbonate of =5 μm as a main filling material of the high-surface-area graphene foam scaffold at 80 ℃ for 2h, wherein the purpose is to remove the surface moisture of the sodium bicarbonate;
2) PVDF-5130 powder is selected as a binder, NMP is used as a solvent, and a digital display stirrer is used for stirring and dispersing under the condition of 600-2000r/min, so that the PVDF powder is fully dissolved, and a PVDF dispersion solution with the mass fraction of 4% is prepared for later use;
3) selecting NMP as an auxiliary solvent according to the properties of a filling main material and a binder for subsequent auxiliary mixing;
4) selecting common reduced graphene oxide powder as a functional material of a graphene foam bracket, and baking the reduced graphene oxide in a vacuum drying oven at 150 ℃ for more than 2 hours to remove moisture in the reduced graphene oxide powder and prevent the problem of sedimentation in the subsequent pulping process;
5) diluting the PVDF dispersion solvent with the mass fraction of 4 percent prepared in the step 2) into a PVDF diluted solution with the mass fraction of 1 percent by using NMP, dispersing at a high speed, and adding D with the mass fraction of 98.5 percent 50 Filling a main material with sodium bicarbonate of which the particle size is 5 microns, fully stirring uniformly, adding 0.5% of reduced graphene oxide powder in percentage by mass, dispersing at a high speed until the slurry state is smooth and has no granular sensation, and subsequently adding a proper amount of NMP solvent to control the viscosity of the slurry to be 4000mPa & S.
6) A square mould with the height of 1cm is used, an opening is formed above the mould, the slurry prepared in the step 5 is poured into the mould until the height of the slurry is just equal to the height of the mould, and the sample is transferred to an oven with the temperature of 80 ℃ for drying after pouring;
7) and immersing the dried sample in a prepared hydrochloric acid solution with the mass fraction of 10% for 2h, and removing the sodium bicarbonate filling main material in the sample in a hydrochloric acid etching mode until the sample does not generate bubbles any more and the solution is not acidic after the pH test paper test reaction, and determining that the reaction is finished. And (3) washing with deionized water until the pH value of the solution is neutral, and then transferring the edge of the graphene foam support to a vacuum oven at 80 ℃ for low-pressure drying after absorbing residual moisture by using dust-free paper to obtain the graphene foam support constructed by graphene and the binder.
This example differs from example 1 in that step 6) was infused using a home-made 1cm high cube mould instead of PET film as the carrier substrate, and the other steps were the same as example 1, with the aim of investigating the effect of coating thickness on sample properties. The results showed that the sample surface obtained had concave collapse and the BET test result was 144.6m 2 This is attributable to the fact that when the coating thickness is large, the coating self-gravity and solvent evaporation cause collapse of the surface structure.
Example 6
The difference between this example and example 5 is that after the mold is filled with slurry, the sample is rapidly immersed in absolute ethanol for solvent exchange, part of NMP in the sample is displaced, and PVDF is not dissolved in absolute ethanol, so that the overall structure of the sample is not affected, and then the sample is dried, and other steps are the same as those in example 5, and the purpose of this example is to investigate the effect of solvent thermal volatilization on the structure of the sample. The structure shows that the concave collapse of the surface of the obtained sample is greatly relieved, and the BET test result is 307.2m 2 The/g, which is attributable to the fact that the thermal volatilization of the solvent has an effect on the surface of the structure, which can lead to the collapse of the surface of the structure.
Example 7
This example differs from example 1 in that PMMA was used instead of PVDF binder in example 1, and the other steps were the same as in example 1, with the objective of investigating the effect of different binders on the sample properties. The results show that the graphene foam scaffold obtained when PMMA is used as the binder has a certain flexibility relative to PVDF binder, and the appearance is still ensured to be maintained after 500 bending experiments, which can be attributed to that the flexibility of the graphene foam scaffold mainly depends on the intrinsic characteristics of the binder.
Claims (10)
1. The preparation method of the graphene foam scaffold is characterized in that sodium carbonate or sodium bicarbonate is used as a filling main material, the filling main material and a bonding agent dispersion liquid are mixed, reduced graphene oxide is added, uniformly stirred and dispersed, coated to form a film, dried and soaked in acid liquor to remove the filling main material, and the graphene foam scaffold is obtained.
2. The method for preparing graphene foam estimation according to claim 1, wherein: the method comprises the following steps:
(1) selecting sodium carbonate or sodium bicarbonate subjected to drying and water removal treatment as a filling main material;
(2) preparing an adhesive dispersion liquid, and mixing an adhesive and a solvent to prepare the adhesive dispersion liquid with the mass fraction of 0.1-3%;
(3) preparing coating slurry, mixing 95-99% of filling main material and 0.1-3% of binder according to mass percentage, fully and uniformly stirring, adding 0.1-2% of graphene functional powder, and dispersing at high speed to obtain the coating slurry;
(4) coating to form a film, coating the coating slurry on a substrate after viscosity adjustment, and drying to obtain a coating layer;
(5) and (3) soaking in acid liquor to remove the filling main material, soaking the coating layer in the acid liquor, and removing the filling main material through the acid liquor to obtain the graphene foam support constructed by the graphene and the adhesive.
3. The method for preparing a graphene foam scaffold according to claim 1 or 2, wherein the method comprises the following steps: the filling main material needs to be baked for 2 hours at 80 ℃ before being added.
4. The method for preparing a graphene foam scaffold according to claim 1 or 2, wherein the method comprises the following steps: the binder is compounded by one or more of PVDF, CMC, PMMA or epoxy resin.
5. The method for preparing a graphene foam scaffold according to claim 1 or 2, wherein the method comprises the following steps: the solvent is NMP, DMF or xylene, preferably NMP.
6. The method for preparing a graphene foam scaffold according to claim 1 or 2, wherein the method comprises the following steps: in the step of preparing the adhesive dispersion liquid, PVDF is used as an adhesive, NMP is used as a solvent, the PVDF and the NMP are mixed and stirred for dispersion, the stirring speed is set to be 600-2000r/min, and the PVDF dispersion liquid with the mass fraction of 0.2% -4% is prepared for later use.
7. The method for preparing a graphene foam scaffold according to claim 1 or 2, wherein the method comprises the following steps: the graphene functional powder is reduced graphene oxide, amino-functionalized graphene powder, element-doped graphene powder or graphene oxide, and preferably, the graphene functional powder is reduced graphene oxide.
8. The method for preparing a graphene foam scaffold according to claim 1 or 2, wherein the method comprises the following steps: in the step of preparing the coating slurry, the graphene functional powder is placed in a vacuum drying oven at 150 ℃ and baked for at least 2 hours before being added, so as to remove moisture in the graphene functional powder.
9. The method for preparing a graphene foam scaffold according to claim 1 or 2, wherein the method comprises the following steps: in the coating and film forming step, the concentration of the coating slurry is controlled to be 2000-10000mPa.S by adding the solvent, the drying temperature after coating is set to be XX-80 ℃, the thickness of the coating layer is XX-400 mu m, and the substrate is made of any one of PE, PET or PP.
10. The method for preparing a graphene foam scaffold according to claim 1 or 2, wherein the method comprises the following steps: in the step of removing the filling main material by acid liquor soaking, the acid liquor selects hydrochloric acid with the mass fraction of 10%, the acid liquor soaking treatment is carried out until the coating layer does not generate bubbles and the PH of the acid liquor is still acidic, the graphene foam scaffold is obtained, and the graphene foam scaffold is washed by deionized water and then is dried.
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| CN115893395A (en) * | 2022-11-29 | 2023-04-04 | 广东墨睿科技有限公司 | High-specific-surface-area reduced graphene oxide/carbon tube composite powder, and preparation method and application thereof |
| CN115893385A (en) * | 2022-12-13 | 2023-04-04 | 之江实验室 | Self-supporting three-dimensional graphene framework, composite material, and preparation method and application of composite material |
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| CN103991864A (en) * | 2014-05-16 | 2014-08-20 | 中国科学技术大学 | Preparation method of graphene aerogel |
| CN104085881A (en) * | 2014-06-10 | 2014-10-08 | 南京邮电大学 | Method of preparing three-dimensional graphene |
| US20170200565A1 (en) * | 2016-01-11 | 2017-07-13 | Aruna Zhamu | Supercapacitor having highly conductive graphene foam electrode |
| US20180196345A1 (en) * | 2017-01-06 | 2018-07-12 | Lawrence Livermore National Security, Llc | Architected three dimensional graphene via additive manufacturing |
| US20190367371A1 (en) * | 2018-05-31 | 2019-12-05 | Nanotek Instruments, Inc. | Graphene foam-based sealing materials |
| AU2020101638A4 (en) * | 2020-08-04 | 2020-09-10 | Inner Mongolia Agricultural University | A graphene aerogel and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115893395A (en) * | 2022-11-29 | 2023-04-04 | 广东墨睿科技有限公司 | High-specific-surface-area reduced graphene oxide/carbon tube composite powder, and preparation method and application thereof |
| CN115893385A (en) * | 2022-12-13 | 2023-04-04 | 之江实验室 | Self-supporting three-dimensional graphene framework, composite material, and preparation method and application of composite material |
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