CN112609452A - Gas diffusion layer material and preparation method thereof - Google Patents
Gas diffusion layer material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a gas diffusion layer material and a preparation method thereof, wherein the preparation method comprises the following steps: uniformly mixing a carbon material, a high molecular polymer and a solvent according to a preset proportion to obtain mixed slurry; putting the carbon fiber product into the slurry for dipping treatment; drying the impregnated carbon fiber product; carrying out heat treatment on the dried carbon fiber product; and carrying out high-temperature carbonization treatment on the carbon fiber product after the heat treatment to obtain the gas diffusion layer material. The carbon fiber product is put into the slurry for dipping treatment, so that the carbon fiber product dipped in the slurry can be fully filled with the slurry containing the carbon material and the high molecular polymer, the pores of the gas diffusion layer material after drying treatment, heat treatment and high-temperature carbonization can be uniformly distributed, and the performance of the fuel cell is ensured.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a gas diffusion layer material and a preparation method thereof.
Background
The gas diffusion layer material is used for preparing a gas diffusion layer, and the gas diffusion layer is used for preparing a fuel cell, so the performance of the fuel cell is directly influenced by the quality of the gas diffusion layer material. The existing gas diffusion layer material is limited by the influence of a coating process (slurry is coated on the surface of a carbon fiber product), so that the slurry is easy to stay on the surface of the carbon fiber product, the slurry cannot be filled in the carbon fiber product, the prepared gas diffusion layer material has uneven pore distribution and large volume resistance, and the performance of a fuel cell is influenced.
Disclosure of Invention
The invention mainly aims to provide a gas diffusion layer material and a preparation method thereof, and aims to solve the technical problem that pores of the prepared gas diffusion layer material are unevenly distributed due to the fact that the gas diffusion layer material is limited by the influence of a coating process in the prior art.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method of making a gas diffusion layer material, the method comprising:
uniformly mixing a carbon material, a high molecular polymer and a solvent according to a preset proportion to obtain mixed slurry;
putting the carbon fiber product into the slurry for dipping treatment;
drying the impregnated carbon fiber product;
carrying out heat treatment on the dried carbon fiber product;
and carrying out high-temperature carbonization treatment on the carbon fiber product after the heat treatment to obtain the gas diffusion layer material.
Preferably, the content of the solvent in the slurry is 75-95%, and the proportion of the carbon-based material in the carbon-based material and the high polymer is 30-70%.
Preferably, the placing of the carbon fiber product into the slurry for the impregnation treatment includes: and (3) putting the carbon fiber product into the slurry for soaking for 1-90 s, taking out and draining.
Preferably, the drying treatment of the impregnated carbon fiber product comprises: drying the impregnated carbon fiber product for 1-5 h at the temperature of 50-150 ℃.
Preferably, the heat-treating the dried carbon fiber product comprises: and treating the dried carbon fiber product at the temperature of 200-400 ℃ for 3-30 min.
Preferably, the high-temperature carbonization treatment of the heat-treated carbon fiber product comprises: carbonizing the carbon fiber product after the heat treatment for 0.2-2 h at the temperature of 1000-2000 ℃.
Preferably, the carbon-based material is one or more of graphite, carbon black, graphene, and carbon nanotubes.
Preferably, the high molecular polymer is one or more of polyvinylpyrrolidone, polyethylene glycol, polyacrylamide and polyvinyl alcohol.
Preferably, the solvent is one or more of water, ethanol, and N-methylpyrrolidone.
The other technical scheme provided by the invention is as follows:
a gas diffusion layer material having an areal density of 25g/m2~65g/m2The thickness is 70 μm to 250 μm.
Compared with the prior art, the invention has the following beneficial effects:
the carbon fiber product is placed into the slurry to be subjected to dipping treatment, so that the carbon fiber product immersed into the slurry can be fully filled with the slurry containing the carbon material and the high polymer, the pores of the gas diffusion layer material subjected to drying treatment, heat treatment and high-temperature carbonization can be uniformly distributed, and the performance of the fuel cell is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of a method of making a gas diffusion layer material according to one embodiment of the present invention.
Fig. 2 is a schematic diagram of a test of applying the gdl material to a fuel cell according to a first embodiment of the present invention.
Fig. 3 is a schematic diagram of a test of the application of the gdl material to a fuel cell according to the second embodiment of the present invention.
Fig. 4 is a schematic diagram of a test of the application of the gdl material to the fuel cell according to the third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1, this embodiment provides a method for preparing a gas diffusion layer material, which specifically includes the following steps:
and S100, uniformly mixing the carbon-based material, the high-molecular polymer and the solvent according to a preset proportion to obtain mixed slurry.
And dispersing the mixed carbon material, the high-molecular polymer and the solvent by using a high-speed dispersing machine to obtain dispersed slurry, wherein the linear velocity of the high-speed dispersing machine is 25-125 m/s, and the dispersing time is 0.5-6 h. The dispersion linear velocity of the high-speed dispersion machine is 25 m/s-125 m/s, so that the problem that the carbon material and the high molecular polymer are not uniformly dispersed due to the fact that the dispersion linear velocity of the high-speed dispersion machine is too low can be avoided, the carbon material and the high molecular polymer are precipitated at the bottom of a solvent, and the upper portion of a carbon fiber product which is subsequently immersed into the slurry cannot be filled with the carbon material and the high molecular polymer in the slurry. Meanwhile, the high-speed dispersion machine can be prevented from being high in energy consumption due to the fact that the linear velocity of the high-speed dispersion machine is too high. The dispersion time of the high-speed dispersion machine is 0.5 h-6 h, so that the phenomenon that the carbon material and the high molecular polymer are not uniformly dispersed due to the excessively short dispersion time of the high-speed dispersion machine can be avoided, the carbon material and the high molecular polymer are precipitated at the bottom of the solvent, and the upper part of the carbon fiber product which is subsequently immersed into the slurry cannot be filled with the carbon material and the high molecular polymer in the slurry. Meanwhile, the high-speed dispersion machine can be prevented from consuming high energy due to overlong dispersion time.
Preferably, the dispersion linear speed is 50 m/s-100 m/s, and the dispersion time is 1 h-4 h.
And S200, putting the carbon fiber product into the slurry for dipping treatment. The carbon fiber product immersed in the slurry can be uniformly filled with the carbon material and the high molecular polymer in the slurry through immersion treatment, so that pores of a subsequently prepared gas diffusion layer material can be uniformly distributed, and the performance of the fuel cell is ensured.
Specifically, the carbon fiber product is placed into the slurry to be soaked for 1 s-90 s. By the arrangement, the phenomenon that the carbon fiber product cannot be fully filled with the slurry containing the carbon material and the high polymer due to the fact that the time for putting the carbon fiber product into the slurry is too short can be avoided, and the pore distribution of the gas diffusion layer material is uneven. Meanwhile, the phenomenon that the production efficiency of the gas diffusion layer material is influenced due to the fact that the carbon fiber product is placed into the slurry for too long time can be avoided.
And taking out the impregnated carbon fiber product and draining. The carbon-series material and the high molecular polymer in the slurry can fully enter the carbon fiber product through the draining treatment, so that the pores of the subsequently prepared gas diffusion layer material can be distributed more uniformly.
And S300, drying the impregnated carbon fiber product.
Specifically, the impregnated carbon fiber product is dried for 5min to 30min at the temperature of 50 ℃ to 150 ℃. The drying temperature is 50-150 ℃, so that the phenomenon that the carbon fiber product is dried for a long time due to the fact that the drying temperature is too low, and the production efficiency of the gas diffusion layer material is affected can be avoided; meanwhile, the problem that the surface of the carbon fiber product is easy to form a film due to overhigh temperature of drying treatment can be avoided, so that the solvent in the carbon fiber product cannot be dried, and the yield of the gas diffusion layer material is influenced. The drying time is 5min-30min, so that incomplete drying of the carbon fiber product caused by too short drying time can be avoided, and the performance of the gas diffusion layer material is influenced; meanwhile, the production efficiency of the gas diffusion layer material can be prevented from being influenced due to too long drying treatment time.
And S400, carrying out heat treatment on the dried carbon fiber product.
Specifically, the dried carbon fiber product is treated for 3 min to 30min at the temperature of 200 ℃ to 400 ℃. The heat treatment temperature is 200-400 ℃, so that incomplete reaction of the carbon fiber product caused by too low heat treatment temperature can be avoided, and the performance of the gas diffusion layer material is influenced; meanwhile, the carbon fiber product can be prevented from burning due to overhigh temperature of heat treatment. The heat treatment time is 3 min-30min, so that incomplete reaction of the carbon fiber product caused by too short heat treatment time can be avoided, and the performance of the gas diffusion layer material is influenced. Meanwhile, the production efficiency of the gas diffusion layer material can be prevented from being influenced due to overlong heat treatment time.
And S500, performing high-temperature carbonization treatment on the carbon fiber product subjected to heat treatment to obtain a gas diffusion layer material.
Specifically, the carbon fiber product after heat treatment is carbonized for 0.2 to 2 hours at the temperature of 1000 to 2000 ℃. The carbonization temperature is 1000-2000 ℃, so that incomplete reaction of the carbon fiber product caused by too low carbonization temperature can be avoided, and the performance of the gas diffusion layer material is influenced. Meanwhile, the over-high energy consumption of the carbonization furnace caused by the over-high temperature of the carbonization treatment can be avoided. The carbonization treatment time is 0.2-2 h, so that incomplete reaction of the carbon fiber product caused by too short carbonization treatment time can be avoided, and the performance of the gas diffusion layer material is influenced. Meanwhile, the over-high energy consumption of the carbonization furnace caused by the over-long carbonization treatment time can be avoided.
In the embodiment, the carbon fiber product is put into the slurry for impregnation treatment, so that the carbon fiber product immersed in the slurry can be fully filled with the slurry containing the carbon-based material and the high molecular polymer, and the pores of the gas diffusion layer material after drying treatment, heat treatment and high-temperature carbonization can be uniformly distributed, thereby ensuring the performance of the fuel cell.
The carbon-based material is one or more of graphite, carbon black, graphene and carbon nanotubes.
The graphite is one or two of artificial graphite and natural graphite.
The particle size of graphite is 0.1 mu m ~40 mu m, so set up, can avoid leading to carbon fiber product's hole to be plugged up by graphite completely because of the particle size undersize of graphite to influence the performance of gas diffusion layer material. Meanwhile, the phenomenon that no graphite exists in the pores of the carbon fiber product due to the fact that the particle size of the graphite is too large can be avoided, and therefore the performance of the gas diffusion layer material is affected.
Preferably, the particle size of the graphite is 0.2-10 μm.
The crystallinity of the graphite is larger than 90 percent, so that the poor conductivity of the gas diffusion layer material caused by the over-small crystallinity of the graphite can be avoided.
The ash content of the graphite is less than 2%. So set up, can avoid influencing the performance of gas diffusion layer material because of the ash content of graphite is too big. Ash corresponds to an impurity in graphite.
The specific surface area of the carbon black was 2m2/g~100m2The arrangement can avoid the influence on the performance of the gas diffusion layer material caused by larger particles of the carbon black due to the over-small specific surface area of the carbon black. Meanwhile, poor dispersibility of the carbon black caused by overlarge specific surface area of the carbon black can be avoided, so that the carbon black can easily and completely block the pores of carbon fiber products.
Preferably, the carbon black has a specific surface area of 10m2/g~80m2/g。
The ash content of the carbon black is less than 0.5 percent, so that the influence on the performance of the gas diffusion layer material due to excessive impurities of the carbon black can be avoided.
The particle diameter of carbon black is 20nm ~500nm, so set up, can avoid leading to the carbon black can't fill in carbon fiber product's tiny hole because of the particle diameter of carbon black is too big to influence the performance of gas diffusion layer material. Meanwhile, the problem that the dipping effect is influenced because the size of the carbon black is too small and the slurry cannot be effectively dispersed can be avoided.
The number of graphene layers is less than 10. So set up, can avoid leading to the electric conductivity of gas diffusion layer material to be relatively poor because of the number of piles of graphite alkene is too much.
The area of the graphene is 0.2-5.0 μm. So set up, can avoid not having graphite alkene in the hole that leads to carbon fiber product because of the too big area of graphite alkene to influence the performance of gas diffusion layer material. Meanwhile, the problem that the pores of the carbon fiber product are completely blocked by the graphene due to the small area of the graphene can be avoided, so that the performance of the gas diffusion layer material is influenced.
Preferably, the area of the graphene is 0.5-4.0 μm.
The carbon nanotube is a single-walled carbon nanotube or a multi-walled carbon nanotube.
The length of the carbon nano tube is 0.2-200 mu m, and by the arrangement, the problem that the carbon nano tube cannot be connected with other particles due to the over short length of the carbon nano tube can be avoided, so that the conductivity of the gas diffusion layer material is poor. Meanwhile, the problem that the carbon nano tubes are poor in dispersity due to the fact that the carbon nano tubes are too long can be avoided, and the carbon nano tubes cannot be attached to carbon fiber products, so that the dipping effect is affected.
Preferably, the length of the carbon nanotube is 1 μm to 100 μm.
The content of the solvent in the slurry is 75% -95%, and by the arrangement, the situation that the pores of the carbon fiber product are completely blocked by the carbon material and the high molecular polymer due to the fact that the content of the solvent in the slurry is too small can be avoided, and therefore the performance of the gas diffusion layer material is affected. Meanwhile, the problem that the pores in the carbon fiber product cannot be effectively filled by the carbon-based material and the high molecular polymer due to the overlarge solvent content in the slurry can be avoided, so that the performance of the gas diffusion layer material is influenced.
The carbon-based material accounts for 30-70% in carbon-based material and high molecular polymer, so set up, can avoid leading to the hole in the carbon fiber product can not effectively be filled by carbon-based material because of the proportion undersize of carbon-based material in carbon-based material and high molecular polymer to influence the performance of gas diffusion layer material. Meanwhile, the problem that the carbon material occupies too high proportion in the carbon material and the high molecular polymer to cause the pores of the carbon fiber product to be completely blocked by the carbon material can be avoided, so that the performance of the gas diffusion layer material is influenced.
The high molecular polymer is one or more of polyvinylpyrrolidone, polyethylene glycol, polyacrylamide and polyvinyl alcohol.
The content of nitrogen in the polyvinylpyrrolidone is 10% -13%, and the K value of the polyvinylpyrrolidone is 15, 17, 25, 30 or 90. Wherein K represents the molecular weight of the high molecular polymer, and different K values correspond to different molecular weights.
Preferably, the polyvinylpyrrolidone has a K-value of 17, 25 or 30.
The polyethylene glycol is polyethylene glycol 400, polyethylene glycol 2000, polyethylene glycol 6000 or polyethylene glycol 12000.
The molecular weight of the polyacrylamide is 50-600 ten thousand, and by the arrangement, the phenomenon that the adhesion force of the polyacrylamide on carbon materials and carbon fiber products is small due to the fact that the molecular weight of the polyacrylamide is too small can be avoided, and therefore the performance of the gas diffusion layer material is affected. Meanwhile, the problems that the solubility of polyacrylamide is low and the viscosity of slurry is too high due to too high molecular weight of polyacrylamide can be avoided, so that the dipping effect is influenced.
Preferably, the molecular weight of the polyacrylamide is 200-400 ten thousand.
The molecular weight of the polyvinyl alcohol is 0.8-30 ten thousand, and by the arrangement, the phenomenon that the adhesive force of the polyvinyl alcohol on the carbon material and the carbon fiber product is small due to the fact that the molecular weight of the polyvinyl alcohol is too small, and therefore the performance of the gas diffusion layer material is affected can be avoided. Meanwhile, the problems that the solubility of the polyvinyl alcohol is low and the viscosity of the slurry is too high due to the overlarge molecular weight of the polyvinyl alcohol can be avoided, so that the dipping effect is influenced.
Preferably, the molecular weight of the polyvinyl alcohol is 1.6-20 ten thousand.
The solvent is one or more of water, ethanol and N-methylpyrrolidone.
The carbon fiber product comprises carbon paper, carbon felt or carbon cloth.
The thickness of the carbon fiber product is 30-400 microns, and by the arrangement, the problem that the mechanical property of the carbon fiber product is poor due to the fact that the thickness of the carbon fiber product is too thin can be avoided, and therefore the performance of the gas diffusion layer material is affected. Meanwhile, the problem that the gas diffusion layer material has poor air permeability due to the fact that the carbon fiber product is too thick can be avoided, and therefore the performance of the gas diffusion layer material is affected.
Preferably, the thickness of the carbon fiber product is 50-200 μm.
The mass percentage of the carbon fiber product is more than 60 percent. So set up, can avoid leading to the carbon content in the carbon fiber product less because of the carbon fiber mass percent undersize of carbon fiber product for the electric conductivity of gas diffusion layer material is relatively poor.
Preferably, the carbon fiber product has a carbon fiber mass percentage of greater than 80%.
The volume ratio of the carbon fibers in the carbon fiber product is 40-95%. By the arrangement, the problem that the carbon content in the carbon fiber product is small due to the fact that the mass percentage of the carbon fibers of the carbon fiber product is too small can be avoided, and the conductivity of the gas diffusion layer material is poor.
In one embodiment, a gas diffusion layer material is provided having an areal density of 25g/m2~65g/m2The thickness is 70 μm to 250 μm.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Implementing one step:
1.5g of natural graphite and 1.5g of carbon black are taken, 3.5g of polyvinylpyrrolidone and 3.5g of polyethylene glycol 400 are taken, and 100g of water and 90g of ethanol are added into the uniformly mixed natural graphite and carbon black. Wherein the natural graphite has a particle size of 2 μm, a crystallinity of 95%, and an ash content of less than 2%. The specific surface area of the carbon black was 10g/m2Ash content is less than 0.5%, and particle size is 50 nm. The polyvinylpyrrolidone had a nitrogen content of 10% and a K value of 15. The polyethylene glycol is polyethylene glycol 400.
And dispersing the mixed natural graphite, carbon black, polyvinylpyrrolidone, water, polyethylene glycol and ethanol by using a high-speed dispersing machine to obtain dispersed slurry, wherein the linear speed of the high-speed dispersing machine is 20m/s, and the dispersing time is 1 h.
And (4) immersing the carbon paper into the dispersed slurry for 1s, taking out and draining. Wherein the thickness of the carbon paper is 50 μm, the mass percent of the carbon fiber of the carbon paper is 65%, and the volume percentage of the carbon fiber in the carbon paper is 95%.
Drying the drained carbon paper at the temperature of 50 ℃ for 15 min; then, carrying out heat treatment on the dried carbon paper at the temperature of 200 ℃, wherein the heat treatment time is 5 min; and carbonizing the carbon paper subjected to the heat treatment by using a carbonization furnace, wherein the carbonization temperature is 1000 ℃, the carbonization time is 2 hours, and the protective atmosphere is nitrogen.
The areal density of the gas diffusion layer material obtained in this example was 25g/m2The thickness was 100. mu.m. The gas diffusion layer material obtained in this example was prepared into a gas diffusion layer and assembled into a fuel cell, and the test results are shown in fig. 2.
Example two:
and taking 7.5g of artificial graphite and 7.5g of single-walled carbon nanotubes, taking 7.5g of polyvinylpyrrolidone and 7.5g of polyacrylamide, and adding 150g of water and 20g N-methyl pyrrolidone into the uniformly mixed artificial graphite and single-walled carbon nanotubes. Wherein the particle size of the artificial graphite is 5 μm, the crystallinity is 98%, and the ash content is less than 2%; the length of the single-walled carbon nanotube is 50 μm; the content of nitrogen in the polyvinylpyrrolidone is 12%, and the K value is 25; the molecular weight of polyacrylamide is 300 ten thousand.
And (3) dispersing the mixed artificial graphite, single-walled carbon nanotubes, polyvinylpyrrolidone, polyacrylamide, water and N-methylpyrrolidone by using a high-speed dispersing machine, wherein the linear velocity of the high-speed dispersing machine is 75m/s, and the dispersing time is 2.5 h.
And (4) immersing the carbon paper into the dispersed slurry for 50s, taking out and draining. Wherein the thickness of the carbon paper is 125 μm, the mass percent of the carbon fiber of the carbon paper is 80%, and the volume percentage of the carbon fiber in the carbon paper is 65%.
Drying the drained carbon paper at the temperature of 100 ℃, wherein the drying time is 10 min; then, carrying out heat treatment on the dried carbon paper at the temperature of 300 ℃, wherein the heat treatment time is 18 min; and carbonizing the carbon paper subjected to the heat treatment by using a carbonization furnace, wherein the carbonization temperature is 1500 ℃, the carbonization time is 1.2h, and the protective atmosphere is argon.
The areal density of the gas diffusion layer material obtained in this example was 45g/m2The thickness was 150. mu.m. This embodiment is describedThe obtained gas diffusion layer material was prepared into a gas diffusion layer and assembled into a fuel cell, and the test results are shown in fig. 3.
Example three:
30g of artificial graphite and 5g of graphene are taken, 7.5g of polyvinylpyrrolidone and 7.5g of polyvinyl alcohol are taken, and 150g of water is added into the uniformly mixed artificial graphite and graphene. The particle size of the artificial graphite is 10 μm, the crystallinity is 99%, and the ash content is less than 2%. The number of graphene layers is less than 10, and the sheet size is 2 μm. The polyvinylpyrrolidone had a nitrogen content of 13% and a K value of 90. The molecular weight of the polyvinyl alcohol is 10 ten thousand.
And dispersing the mixed artificial graphite, graphene, polyvinylpyrrolidone, polyvinyl alcohol and water by using a high-speed disperser to obtain dispersed slurry, wherein the linear speed of the high-speed disperser is 20m/s, and the dispersing time is 1 h.
And (4) immersing the carbon paper into the dispersed slurry for 90s, taking out and draining. Wherein the thickness of the carbon paper is 200 μm, the mass percentage of the carbon fiber in the carbon paper is 95%, and the volume percentage of the carbon fiber in the carbon paper is 40%.
Drying the drained carbon paper at the temperature of 150 ℃, wherein the drying time is 15 min; then, carrying out heat treatment on the dried carbon paper at the temperature of 400 ℃, wherein the heat treatment time is 30 min; and carbonizing the carbon paper subjected to the heat treatment by using a carbonization furnace, wherein the carbonization temperature is 2000 ℃, the carbonization time is 2 hours, and the protective atmosphere is nitrogen.
The areal density of the gas diffusion layer material obtained in this example was 25g/m2The thickness was 100. mu.m. The gas diffusion layer material obtained in this example was prepared into a gas diffusion layer and assembled into a fuel cell, and the test results are shown in fig. 4.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method of making a gas diffusion layer material, the method comprising:
uniformly mixing a carbon material, a high molecular polymer and a solvent according to a preset proportion to obtain mixed slurry;
putting the carbon fiber product into the slurry for dipping treatment;
drying the impregnated carbon fiber product;
carrying out heat treatment on the dried carbon fiber product;
and carrying out high-temperature carbonization treatment on the carbon fiber product after the heat treatment to obtain the gas diffusion layer material.
2. The method of claim 1, wherein: the content of the solvent in the slurry is 75-95%, and the proportion of the carbon-based material in the carbon-based material and the high polymer is 30-70%.
3. The method of claim 1, wherein: the step of putting the carbon fiber product into the slurry for dipping treatment comprises the following steps:
and (3) putting the carbon fiber product into the slurry for soaking for 1-90 s, taking out and draining.
4. The method of claim 1, wherein: the drying treatment of the impregnated carbon fiber product comprises the following steps:
drying the impregnated carbon fiber product for 1-5 h at the temperature of 50-150 ℃.
5. The method of claim 1, wherein: the heat treatment of the dried carbon fiber product comprises:
and treating the dried carbon fiber product at the temperature of 200-400 ℃ for 3-30 min.
6. The method of claim 1, wherein: the high-temperature carbonization treatment of the carbon fiber product after the heat treatment comprises the following steps:
carbonizing the carbon fiber product after the heat treatment for 0.2-2 h at the temperature of 1000-2000 ℃.
7. The method of claim 1, wherein: the carbon-based material is one or more of graphite, carbon black, graphene and carbon nanotubes.
8. The method of claim 1, wherein: the high molecular polymer is one or more of polyvinylpyrrolidone, polyethylene glycol, polyacrylamide and polyvinyl alcohol.
9. The method of claim 1, wherein: the solvent is one or more of water, ethanol and N-methyl pyrrolidone.
10. A gas diffusion layer material, characterized in that the gas diffusion layer material has an areal density of 25g/m2~65g/m2The thickness is 70 μm to 250 μm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114023978A (en) * | 2021-10-28 | 2022-02-08 | 中汽创智科技有限公司 | Preparation method of gas diffusion layer base material |
| CN114773647A (en) * | 2022-06-01 | 2022-07-22 | 中国科学院过程工程研究所 | Carbon fiber prepreg and preparation method and application thereof |
| CN114927704A (en) * | 2022-05-12 | 2022-08-19 | 上海碳际实业集团有限公司 | Preparation method of gas diffusion layer for fuel cell |
| CN116556108A (en) * | 2023-05-12 | 2023-08-08 | 深圳市通用氢能科技有限公司 | Preparation method and application of gas diffusion layer |
| CN116706103A (en) * | 2023-08-01 | 2023-09-05 | 深圳市通用氢能科技有限公司 | Preparation method and application of gas diffusion layer for fuel cell and electrolytic water cell |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020058180A1 (en) * | 2000-09-15 | 2002-05-16 | Beattie Paul D. | Fluid diffusion layers for fuel cells |
| CN1734812A (en) * | 2005-06-08 | 2006-02-15 | 武汉理工大学 | Gas diffusion layer material for fuel cell and preparation method thereof |
| US20090047549A1 (en) * | 2007-08-15 | 2009-02-19 | Feng Chia University | Modified carbonized substrate and its manufacturing method and use |
| CN101411016A (en) * | 2006-02-02 | 2009-04-15 | 协进I&C株式会社 | Preparation of gas diffusion layer for fuel cell |
| WO2019049934A1 (en) * | 2017-09-07 | 2019-03-14 | 東洋紡株式会社 | Gas diffusion layer base material for fuel cells, gas diffusion layer for fuel cells, and fuel cell |
| CN110190295A (en) * | 2019-07-04 | 2019-08-30 | 深圳市通用氢能科技有限公司 | Low pressure low humidity fuel battery gas diffusion layer, fuel cell and preparation method |
-
2020
- 2020-12-15 CN CN202011474885.0A patent/CN112609452A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020058180A1 (en) * | 2000-09-15 | 2002-05-16 | Beattie Paul D. | Fluid diffusion layers for fuel cells |
| CN1734812A (en) * | 2005-06-08 | 2006-02-15 | 武汉理工大学 | Gas diffusion layer material for fuel cell and preparation method thereof |
| CN101411016A (en) * | 2006-02-02 | 2009-04-15 | 协进I&C株式会社 | Preparation of gas diffusion layer for fuel cell |
| US20090047549A1 (en) * | 2007-08-15 | 2009-02-19 | Feng Chia University | Modified carbonized substrate and its manufacturing method and use |
| WO2019049934A1 (en) * | 2017-09-07 | 2019-03-14 | 東洋紡株式会社 | Gas diffusion layer base material for fuel cells, gas diffusion layer for fuel cells, and fuel cell |
| CN110190295A (en) * | 2019-07-04 | 2019-08-30 | 深圳市通用氢能科技有限公司 | Low pressure low humidity fuel battery gas diffusion layer, fuel cell and preparation method |
Non-Patent Citations (1)
| Title |
|---|
| 云斯宁: "《新型能源材料与器件》", 31 May 2019, 中国建材工业出版社 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114023978A (en) * | 2021-10-28 | 2022-02-08 | 中汽创智科技有限公司 | Preparation method of gas diffusion layer base material |
| CN114023978B (en) * | 2021-10-28 | 2024-02-02 | 中汽创智科技有限公司 | Preparation method of gas diffusion layer substrate |
| CN114927704A (en) * | 2022-05-12 | 2022-08-19 | 上海碳际实业集团有限公司 | Preparation method of gas diffusion layer for fuel cell |
| CN114773647A (en) * | 2022-06-01 | 2022-07-22 | 中国科学院过程工程研究所 | Carbon fiber prepreg and preparation method and application thereof |
| CN114773647B (en) * | 2022-06-01 | 2023-03-03 | 中国科学院过程工程研究所 | Carbon fiber prepreg and preparation method and application thereof |
| CN116556108A (en) * | 2023-05-12 | 2023-08-08 | 深圳市通用氢能科技有限公司 | Preparation method and application of gas diffusion layer |
| CN116706103A (en) * | 2023-08-01 | 2023-09-05 | 深圳市通用氢能科技有限公司 | Preparation method and application of gas diffusion layer for fuel cell and electrolytic water cell |
| CN116706103B (en) * | 2023-08-01 | 2024-02-13 | 深圳市通用氢能科技有限公司 | Preparation method and application of gas diffusion layer for fuel cell and electrolytic water cell |
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