CN111916765A - Method for preparing gas diffusion layer in fuel cell - Google Patents
Method for preparing gas diffusion layer in fuel cell Download PDFInfo
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- CN111916765A CN111916765A CN202010746018.1A CN202010746018A CN111916765A CN 111916765 A CN111916765 A CN 111916765A CN 202010746018 A CN202010746018 A CN 202010746018A CN 111916765 A CN111916765 A CN 111916765A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8803—Supports for the deposition of the catalytic active composition
- H01M4/8807—Gas diffusion layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/8605—Porous electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention relates to a preparation method of a gas diffusion layer in a fuel cell, which comprises the following steps: (1) placing the diffusion layer matrix in a hydrophobic treatment liquid for hydrophobic pretreatment to obtain a pretreated diffusion layer matrix; (2) placing the pre-treated diffusion layer matrix in a dispersion phase for dipping treatment, and then drying and sintering the matrix in sequence to obtain the gas diffusion layer; the hydrophobic treatment liquid comprises the following components in percentage by mass: 4-20% of polyvinyl alcohol and 7-23% of polytetrafluoroethylene; the dispersed phase comprises the following components in percentage by mass: 0.8-2.5% of dispersing agent, 2-10% of carbon black and 0.3-1% of polytetrafluoroethylene. The method provided by the invention realizes the preparation of the gas diffusion layer in the fuel cell by the strict allocation of the proportion of raw materials and the preparation steps in the preparation process, the aperture of the obtained diffusion layer is 0.6-12 mu m, and the contact angle is 120-165 degrees, so that the structure of the diffusion layer is more stable, the aperture distribution is more uniform, and the gas diffusion layer has good permeability, hydrophobicity and conductivity.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to a preparation method of a gas diffusion layer in a fuel cell.
Background
A PEMFC electrode in a proton exchange membrane fuel cell is a porous gas diffusion electrode, which is generally composed of a diffusion layer and a catalyst layer.
CN110506352A discloses a gas diffusion layer for an electrolyser or fuel cell comprising: a first non-woven layer of metal fibers arranged for contact with the proton exchange membrane; a second non-woven layer of metal fibers; and a third porous metal layer. The first nonwoven layer of metal fibers comprises metal fibers of a first equivalent diameter. The second nonwoven layer of metal fibers comprises metal fibers of a second equivalent diameter. The second equivalent diameter is greater than the first equivalent diameter. The third porous metal layer includes openings. The open pores of the third porous metal layer are larger than the open pores of the second nonwoven layer of metal fibers. The second nonwoven layer is disposed between and in contact with the first nonwoven layer and the third porous metal layer. The second nonwoven layer is metallurgically bonded to the first nonwoven layer and the third porous metal layer. The thickness of the third porous metal layer is at least twice, preferably at least three times the thickness of the first nonwoven layer.
CN103534852A discloses a gas diffusion layer for a fuel cell, which comprises a gas diffusion layer substrate and a microporous layer formed on the surface of the substrate. The microporous layer is formed in a sheet form from a binder and a carbon material containing at least flaky graphite, and the sheet of the microporous layer is bonded to the substrate. This gas diffusion layer for a fuel cell can ensure gas permeability without mixing components constituting the microporous layer in the gas diffusion layer base material. Further, since the fine porous layer contains the flaky graphite as the conductive material, the conductivity and the air permeability can be improved, and the fine porous layer contributes to the improvement of the performance of the solid polymer fuel cell.
CN1988225A discloses a gas diffusion layer for proton exchange membrane fuel cell and a preparation method thereof. The gas diffusion layer comprises a porous supporting layer and a microporous layer, wherein the porous supporting layer is of a net-shaped and porous structure. The microporous layer is compounded on the surface of the porous support layer close to one side of the catalytic layer. The microporous layer uniformly covers the surfaces of the macropores and the fiber-dense region of the porous support layer and does not penetrate into the interior of the porous support layer. The invention adopts dry method to prepare the gas diffusion layer used for proton exchange membrane fuel cell, the used fluorine-containing polymer 1 and fluorine-containing polymer 2 can be the same polymer or different polymers. The hydrophilic/hydrophobic degrees of the porous support layer and the microporous layer of the gas diffusion layer are respectively adjustable. Thus, the structure of the gas diffusion layer is matched with the operating conditions of the fuel cell, water in the gas diffusion layer is more easily discharged, and water-gas distribution is more reasonable.
However, the performance of the gas diffusion layer may have a significant effect on the performance of the cell.
Disclosure of Invention
In view of the problems in the prior art, an object of the present invention is to provide a method for preparing a gas diffusion layer in a fuel cell, which enables the structure of the diffusion layer to be more stable, the pore size distribution to be more uniform, and the cost to be reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a gas diffusion layer in a fuel cell, which comprises the following steps:
(1) placing the diffusion layer matrix in a hydrophobic treatment liquid for hydrophobic pretreatment to obtain a pretreated diffusion layer matrix;
(2) placing the pre-treated diffusion layer matrix in a dispersion phase for dipping treatment, and then drying and sintering the matrix in sequence to obtain the gas diffusion layer;
the hydrophobic treatment liquid comprises the following components in percentage by mass: 4-20% of polyvinyl alcohol and 7-23% of polytetrafluoroethylene; the dispersed phase comprises the following components in percentage by mass: 0.8-2.5% of dispersing agent, 2-10% of carbon black and 0.3-1% of polytetrafluoroethylene.
The method provided by the invention realizes the preparation of the gas diffusion layer in the fuel cell by the strict allocation of the proportion of raw materials and the preparation steps in the preparation process, the aperture of the obtained diffusion layer is 0.6-12 mu m, the contact angle is 120-165 degrees, and simultaneously, the structure of the diffusion layer is more stable, the aperture distribution is more uniform, the cost is reduced, and meanwhile, the method has good air permeability, hydrophobicity and conductivity, is suitable for the large-scale production of the fuel cell, and reduces the cost of the fuel cell.
As a preferable technical scheme of the invention, the diffusion layer substrate in the step (1) comprises carbon paper or carbon cloth.
As a preferred embodiment of the present invention, the hydrophobic pretreatment in step (1) includes dipping and drying in sequence.
In a preferred embodiment of the present invention, the immersion time is 15 to 30min, for example, 15min, 18min, 20min, 22min, 24min, 26min, 28min, or 30min, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
As a preferred embodiment of the present invention, the drying temperature is 100-110 ℃, for example, 100 ℃, 101 ℃, 102 ℃, 103 ℃, 104 ℃, 105 ℃, 106 ℃, 107 ℃, 108 ℃, 109 ℃ or 110 ℃, etc., but not limited to the recited values, and other values not recited in the range are also applicable.
Preferably, the drying time is 60-90min, such as 60min, 65min, 70min, 75min, 80min, 85min or 90min, but not limited to the recited values, and other values not recited in the range are also applicable.
As a preferred embodiment of the present invention, the particle size of the carbon black in the dispersed phase in the step (2) is 120-1200nm, and may be, for example, 120mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 1100mm or 1200mm, but is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range are also applicable.
Preferably, the dispersed phase of step (2) is prepared by mechanical stirring.
Preferably, the mechanical stirring time is 8-24h, such as 8h, 10h, 12h, 14h, 16h, 18h, 20h, 22h or 24h, but not limited to the recited values, and other values not recited in this range are equally applicable.
In a preferred embodiment of the present invention, the time for the immersion treatment in step (2) is 15 to 90min, and may be, for example, 15min, 20min, 30min, 40min, 50min, 60min, 70min, 80min or 90min, but is not limited to the above-mentioned values, and other values not listed in the above range are also applicable.
Preferably, the impregnation treatment in step (2) is carried out 1 to 7 times, for example, 1 time, 2 times, 3 times, 4 times, 5 times, 6 times or 7 times, etc., but not limited to the recited values, and other values not recited in the range are also applicable.
As a preferred embodiment of the present invention, the drying temperature in the step (2) is 75 to 180 ℃ and may be, for example, 75 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 150 ℃, 160 ℃, 170 ℃ or 180 ℃, but not limited to the recited values, and other values not recited in the range are also applicable.
Preferably, the drying time in step (2) is 30-90min, such as 30min, 40min, 50min, 60min, 70min, 80min or 90min, but not limited to the recited values, and other values not recited in the range are also applicable.
As a preferred embodiment of the present invention, the sintering temperature in the step (2) is 120-340 ℃, and may be, for example, 120 ℃, 140 ℃, 160 ℃, 180 ℃, 200 ℃, 220 ℃, 240 ℃, 260 ℃, 280 ℃, 300 ℃, 320 ℃ or 340 ℃, etc., but not limited to the recited values, and other values not recited in the range are also applicable.
Preferably, the sintering time in step (2) is 90-450min, such as 90min, 100min, 150min, 200min, 250min, 300min, 350min, 400min or 450min, but not limited to the recited values, and other values not recited in the range are also applicable.
As a preferred technical scheme of the invention, the preparation method comprises the following steps:
(1) placing the diffusion layer matrix in a hydrophobic treatment liquid for hydrophobic pretreatment to obtain a pretreated diffusion layer matrix; the hydrophobic treatment liquid comprises the following components in percentage by mass: 4-20% of polyvinyl alcohol and 7-23% of polytetrafluoroethylene; the hydrophobic pretreatment comprises dipping and drying which are sequentially carried out; the dipping time is 15-30 min;
(2) placing the pre-treated diffusion layer matrix in a dispersion phase for dipping treatment, and then drying and sintering the matrix in sequence to obtain the gas diffusion layer; the dispersed phase comprises the following components in percentage by mass: 0.8-2.5% of dispersing agent, 2-10% of carbon black and 0.3-1% of polytetrafluoroethylene; the time of the dipping treatment is 15-90 min; the dipping treatment is carried out for 1 to 7 times; the sintering temperature is 120-340 ℃; the sintering time is 90-450 min.
In the invention, drying operation can be arranged between two times of dipping treatment in multiple times of dipping treatment, and the drying is drying for 30-90min at 75-180 ℃. Or drying after the whole impregnation process is completed.
Further, in the impregnation and sintering in the present invention, sintering may be performed after one impregnation. Or sintering after impregnation (the times can be 1 or more), then cooling, continuing impregnation (the times can be 1 or more), and then sintering. Impregnation-sintering this step may be performed 1 or more times.
In the present invention, the solvent in the hydrophobic treatment liquid and the dispersed phase is water, preferably deionized water.
In the invention, the dispersing agent in the dispersed phase comprises polyvinyl alcohol, Tween-60 or TritonX-100 and the like.
In the present invention, the carbon black powder includes acetylene black, activated carbon black, and the like.
Compared with the prior art, the invention at least has the following beneficial effects:
the method provided by the invention realizes the preparation of the gas diffusion layer in the fuel cell by the strict allocation of the proportion of raw materials and the preparation steps in the preparation process, the aperture of the obtained diffusion layer is 0.6-12 mu m, the contact angle is 120-165 degrees, and simultaneously, the structure of the diffusion layer is more stable, the aperture distribution is more uniform, the cost is reduced, and meanwhile, the method has good air permeability, hydrophobicity and conductivity, is suitable for the large-scale production of the fuel cell, and reduces the cost of the fuel cell.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a preparation method of a gas diffusion layer in a fuel cell, which comprises the following steps:
(1) placing the diffusion layer matrix in a hydrophobic treatment liquid for hydrophobic pretreatment to obtain a pretreated diffusion layer matrix; the hydrophobic treatment liquid comprises the following components in percentage by mass: 15% polyvinyl alcohol (molecular weight is 12000), 15% polytetrafluoroethylene, and the balance of water; the hydrophobic pretreatment comprises dipping and drying which are sequentially carried out; the dipping time is 20 min; the temperature of the drying is 105 ℃; the drying time is 75 min;
(2) placing the pre-treated diffusion layer matrix in a dispersion phase for dipping treatment, and then drying and sintering the matrix in sequence to obtain the gas diffusion layer; the dispersed phase comprises the following components in percentage by mass: 1.5% of a dispersant (polyvinyl alcohol, molecular weight of 12000), 7% of acetylene black, 0.6% of polytetrafluoroethylene, and the balance of water; the particle size of the acetylene black in the dispersed phase is 700 nm; the dispersed phase is prepared by mechanical stirring; the mechanical stirring time is 15 hours; the time of the dipping treatment is 75 min; the dipping treatment is carried out for 4 times; drying after the impregnation is finished; the drying temperature is 120 ℃; the drying time is 60 min; the sintering temperature is 240 ℃; the sintering time is 200 min.
The pore diameter of the gas diffusion layer obtained was 6 μm and the contact angle was 140 °.
Example 2
The embodiment provides a preparation method of a gas diffusion layer in a fuel cell, which comprises the following steps:
(1) placing the diffusion layer matrix in a hydrophobic treatment liquid for hydrophobic pretreatment to obtain a pretreated diffusion layer matrix; the hydrophobic treatment liquid comprises the following components in percentage by mass: 20% polyvinyl alcohol (molecular weight 12100), 7% polytetrafluoroethylene; the hydrophobic pretreatment comprises dipping and drying which are sequentially carried out; the dipping time is 30 min; the drying temperature is 100 ℃; the drying time is 90 min;
(2) placing the pre-treated diffusion layer matrix in a dispersion phase for dipping treatment, and then drying and sintering the matrix in sequence to obtain the gas diffusion layer; the dispersed phase comprises the following components in percentage by mass: 2.5% of a dispersant (Tween-60), 9% of Keqin black, 0.3% of polytetrafluoroethylene; the particle size of the Ketjen black in the dispersed phase is 120 nm; the dispersed phase is prepared by mechanical stirring; the mechanical stirring time is 8 hours; the time of the dipping treatment is 80 min; the dipping treatment is carried out for 2 times; the drying temperature is 75 ℃; the drying time is 30 min; the sintering temperature is 130 ℃; the sintering time is 100 min.
The pore diameter of the gas diffusion layer was 1 μm and the contact angle was 160 °.
Example 3
The embodiment provides a preparation method of a gas diffusion layer in a fuel cell, which comprises the following steps:
(1) placing the diffusion layer matrix in a hydrophobic treatment liquid for hydrophobic pretreatment to obtain a pretreated diffusion layer matrix; the hydrophobic treatment liquid comprises the following components in percentage by mass: 5% polyvinyl alcohol (molecular weight 12000), 22% polytetrafluoroethylene; the hydrophobic pretreatment comprises dipping and drying which are sequentially carried out; the dipping time is 15 min; the drying temperature is 110 ℃; the drying time is 90 min;
(2) placing the pre-treated diffusion layer matrix in a dispersion phase for dipping treatment, and then drying and sintering the matrix in sequence to obtain the gas diffusion layer; the dispersed phase comprises the following components in percentage by mass: 1% of dispersing agent (TritonX-100), 3% of active carbon black and 1% of polytetrafluoroethylene; the particle size of the active carbon black in the dispersed phase is 1100 nm; the dispersed phase is prepared by mechanical stirring; the mechanical stirring time is 22 h; the time of the dipping treatment is 20 min; the dipping treatment is carried out for 4 times; the temperature of the drying is 175 ℃; the drying time is 88 min; the sintering temperature is 333 ℃; the sintering time was 424 min.
The resulting gas diffusion layer had a pore size of 10 and a contact angle of 127 °.
Example 4
The embodiment provides a preparation method of a gas diffusion layer in a fuel cell, which comprises the following steps:
(1) placing the diffusion layer matrix in a hydrophobic treatment liquid for hydrophobic pretreatment to obtain a pretreated diffusion layer matrix; the hydrophobic treatment liquid comprises the following components in percentage by mass: 8% polyvinyl alcohol (molecular weight 13000), 21% polytetrafluoroethylene; the hydrophobic pretreatment comprises dipping and drying which are sequentially carried out; the dipping time is 26 min; the drying temperature is 108 ℃; the drying time is 66 min;
(2) placing the pre-treated diffusion layer matrix in a dispersion phase for dipping treatment, and then drying and sintering the matrix in sequence to obtain the gas diffusion layer; the dispersed phase comprises the following components in percentage by mass: 2% of a dispersant (polyvinyl alcohol, molecular weight 13000), 5% of acetylene black, 0.8% of polytetrafluoroethylene; the particle size of the carbon black in the dispersed phase is 670 nm; the dispersed phase is prepared by mechanical stirring; the mechanical stirring time is 20 hours; the time of the dipping treatment is 40 min; the dipping treatment is carried out for 7 times; the drying temperature is 150 ℃; the drying time is 75 min; the sintering temperature is 175 ℃; the sintering time is 300 min.
The pore diameter of the gas diffusion layer obtained was 9 μm, and the contact angle was 133 °.
Comparative example 1
The difference from example 1 is only that the mass percentage of polyvinyl alcohol in the hydrophobic treatment liquid is 1%, the pore size of the gas diffusion layer is 15 μm, and the contact angle is 111 °.
Comparative example 2
The difference from example 1 is only that the mass percentage of the polyvinyl alcohol in the hydrophobic treatment liquid is 40%, the pore size of the gas diffusion layer is 16 μm, and the contact angle is 110 °.
Comparative example 3
The difference from example 1 is only that the mass percentage of the polytetrafluoroethylene in the hydrophobic treatment liquid is 1%, the pore size of the gas diffusion layer is 15 μm, and the contact angle is 107 °.
Comparative example 4
The difference from example 1 is only that the mass percentage of the polytetrafluoroethylene in the hydrophobic treatment liquid is 40%, the pore size of the gas diffusion layer is 18 μm, and the contact angle is 112 °.
Comparative example 5
The only difference from example 1 is that the immersion was carried out without the hydrophobic pretreatment, and the resulting gas diffusion layer had a pore diameter of 16 μm and a contact angle of 110 °.
Comparative example 6
The difference from example 1 is only that, instead of performing the hydrophobic pretreatment, a hydrophobic treatment liquid and a dispersed phase were mixed (keeping the respective mass percentages constant) and then impregnated, and the pore diameter of the gas diffusion layer was 17 μm and the contact angle was 108 °.
The solid content of polytetrafluoroethylene used in the above examples and comparative examples was 60%.
As can be seen from the results of the above examples and comparative examples, the method provided by the present invention realizes the preparation of the gas diffusion layer in the fuel cell by the strict allocation of the raw material ratio and the preparation steps in the preparation process, the aperture of the obtained diffusion layer is 0.6-12 μm, the contact angle is 120-165 DEG, and simultaneously, the structure of the diffusion layer is more stable, the aperture distribution is more uniform, the cost is reduced, and the method has good air permeability, hydrophobicity and electrical conductivity, is suitable for the mass production of the fuel cell, and reduces the cost of the fuel cell.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A method of preparing a gas diffusion layer in a fuel cell, the method comprising the steps of:
(1) placing the diffusion layer matrix in a hydrophobic treatment liquid for hydrophobic pretreatment to obtain a pretreated diffusion layer matrix;
(2) placing the pre-treated diffusion layer matrix in a dispersion phase for dipping treatment, and then drying and sintering the matrix in sequence to obtain the gas diffusion layer;
the hydrophobic treatment liquid comprises the following components in percentage by mass: 4-20% of polyvinyl alcohol and 7-23% of polytetrafluoroethylene; the dispersed phase comprises the following components in percentage by mass: 0.8-2.5% of dispersing agent, 2-10% of carbon black and 0.3-1% of polytetrafluoroethylene.
2. The method of claim 1, wherein the diffusion layer substrate of step (1) comprises a carbon paper or a carbon cloth.
3. The method according to claim 1 or 2, wherein the hydrophobic pretreatment in the step (1) comprises dipping and drying in this order.
4. The method of claim 3, wherein the time for the immersion is 15 to 30 min.
5. The method as claimed in claim 3, wherein the drying temperature is 100-110 ℃;
preferably, the drying time is 60-90 min.
6. The production method as claimed in any one of claims 1 to 5, wherein the particle size of the carbon black in the dispersed phase in the step (2) is 120-1200 nm;
preferably, the dispersed phase in the step (2) is prepared by mechanical stirring;
preferably, the time of mechanical stirring is 8-24 h.
7. The production method according to any one of claims 1 to 6, wherein the time for the impregnation treatment in the step (2) is 15 to 90 min;
preferably, the impregnation treatment of step (2) is performed 1 to 7 times.
8. The method according to any one of claims 1 to 7, wherein the drying temperature in the step (2) is 75 to 180 ℃;
preferably, the drying time in step (2) is 30-90 min.
9. The method according to any one of claims 1-8, wherein the sintering temperature in step (2) is 120-340 ℃;
preferably, the sintering time in the step (2) is 90-450 min.
10. The method of any one of claims 1 to 9, comprising the steps of:
(1) placing the diffusion layer matrix in a hydrophobic treatment liquid for hydrophobic pretreatment to obtain a pretreated diffusion layer matrix; the hydrophobic treatment liquid comprises the following components in percentage by mass: 4-20% of polyvinyl alcohol and 7-23% of polytetrafluoroethylene; the hydrophobic pretreatment comprises dipping and drying which are sequentially carried out; the dipping time is 15-30 min;
(2) placing the pre-treated diffusion layer matrix in a dispersion phase for dipping treatment, and then drying and sintering the matrix in sequence to obtain the gas diffusion layer; the dispersed phase comprises the following components in percentage by mass: 0.8-2.5% of dispersing agent, 2-10% of carbon black and 0.3-1% of polytetrafluoroethylene; the time of the dipping treatment is 15-90 min; the dipping treatment is carried out for 1 to 7 times; the sintering temperature is 120-340 ℃; the sintering time is 90-450 min.
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| CN114464834A (en) * | 2022-01-25 | 2022-05-10 | 深圳市通用氢能科技有限公司 | Fuel cell gas diffusion layer, preparation method thereof and fuel cell |
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