CN115377439A - Preparation method of gas diffusion layer for enhancing water management capacity and application of gas diffusion layer in fuel cell - Google Patents

Preparation method of gas diffusion layer for enhancing water management capacity and application of gas diffusion layer in fuel cell Download PDF

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Publication number
CN115377439A
CN115377439A CN202211155314.XA CN202211155314A CN115377439A CN 115377439 A CN115377439 A CN 115377439A CN 202211155314 A CN202211155314 A CN 202211155314A CN 115377439 A CN115377439 A CN 115377439A
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gas diffusion
diffusion layer
water management
preparing
gdl
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陈海平
刘楷涛
马浩然
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Shenzhen General Hydrogen Energy Technology Co ltd
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Shenzhen General Hydrogen Energy Technology Co ltd
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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
    • 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
    • H01M4/8817—Treatment of supports before application of the catalytic active composition
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Inert Electrodes (AREA)

Abstract

The invention relates to a method for preparing a gas diffusion layer with enhanced water management capability and the use of the gas diffusion layer in a fuel cell, comprising at least the following steps: s1, preparing a steeping liquor with the concentration of 1-8 wt%; s2, placing the gas diffusion layer in a clamp with pressing plates arranged at the upper part and the lower part, wherein 2 pressing plates are tightly attached to the upper surface and the lower surface of the gas diffusion layer, applying pressure of 0.5-3MPa to the gas diffusion layer, and introducing impregnation liquid by using a pump; s3, discharging redundant impregnation liquid after impregnation is completed; and (3) placing the fixture and the gas diffusion layer in the step (S2) in a nitrogen environment, and sintering at the temperature of 80-180 ℃ for 0.5-90min to obtain the gas diffusion layer with enhanced water management capability. The gas diffusion layer for enhancing water management ability in the application has good water retention/drainage ability under the condition of ensuring that the electrical conductivity of the gas diffusion layer is unchanged.

Description

Preparation method of gas diffusion layer for enhancing water management capacity and application of gas diffusion layer in fuel cell
Technical Field
The present invention relates to the field of fuel cells, and more particularly, to a method for preparing a gas diffusion layer for enhancing water management ability and an application of the gas diffusion layer in a fuel cell.
Background
Hydrogen energy is used as a secondary energy source, and becomes the focus of current energy revolution by virtue of the advantages of abundant reserves, cleanness, high efficiency, large-range energy storage adaptation and the like. The proton exchange membrane fuel cell is a main form of hydrogen energy application, has the advantages of high energy density, low noise, high reliability, high efficiency and the like, can replace the traditional fossil energy, and is widely applied to the fields of industry, traffic, life and the like.
The key components of the proton exchange membrane fuel cell mainly comprise: a catalyst layer, a proton exchange membrane, a gas diffusion layer, and a bipolar plate. Gas Diffusion Layers (GDLs) are located between the catalyst layers and the bipolar plates and mainly function to conduct reaction Gas, discharge excess water, conduct heat, conduct electrons, provide mechanical support for the membrane electrode, and the like.
During the actual use of the fuel cell, it is found that the operating conditions of the fuel cell are different in different scenes, and the corresponding humidification degree is also different. Under high humidity and high current, the fuel cell has more water, so that flooding is easily caused, and the performance of the fuel cell is further influenced, so that the drainage capacity of the fuel cell needs to be improved; under low humidity and low current, the water content in the fuel cell is low, and the phenomenon of membrane dryness is easy to occur to influence the proton conductivity, thereby influencing the cell performance. Therefore, higher demands are made on the water management capability of the gas diffusion layer.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of a gas diffusion layer for enhancing water management capacity and application of the gas diffusion layer in a fuel cell.
In order to solve the above technical problems, one aspect of the present invention is to provide a method for preparing a gas diffusion layer with enhanced water management capability, which at least includes the following steps:
s1, preparing a steeping liquor with the concentration of 1-8 wt%;
s2, placing the gas diffusion layer in a clamp with pressing plates arranged up and down, wherein the 2 pressing plates are closely attached to the upper surface and the lower surface of the gas diffusion layer and then face the gas diffusion layerUniformly applying pressure of 0.5-3MPa on the surface; wherein the gas diffusion layer comprises a first side and a second side opposite to the first side, the impregnation liquid prepared in the step S1 is pumped in from the first side in sequence by using a pump, the second side flows out, and t 1 The time for the immersion fluid to flow from the first side to the second side; then the liquid flows in from the second side edge and flows out from the first side edge, t 2 The time for the maceration extract to flow from the second side to the first side, wherein the flow rate of the maceration extract is 20-120mL/min;
s3, stopping liquid supply after the impregnation is finished, and standing to discharge redundant impregnation liquid; and (3) placing the fixture and the gas diffusion layer in the step (S2) in a nitrogen environment, sintering for 0.5-90min at the temperature of 80-180 ℃, and then releasing pressure to take out the gas diffusion layer to obtain the gas diffusion layer with enhanced water management capability.
Further, the gas diffusion layer used in step S2 is GDL produced by general hydrogen energy technology limited, shenzhen, or other commercial GDLs.
Further, the t is 1 Is 20-100min; said t is 2 Is 20-100min.
Through the technical scheme, the soaking time is determined by the type of the soaking liquid, the concentration of the soaking liquid and the physical properties of the gas diffusion layer.
When the viscosity of the impregnation liquid is low to facilitate impregnation, the impregnation liquid has strong interaction with the GDL, the GDL has large pores, and the flow rate of the impregnation liquid is high, so that the impregnation time is short. When the viscosity of the impregnation liquid is increased, the interaction with the GDL is weak, and the flow rate of the impregnation liquid is small, the impregnation time is long.
Meanwhile, the surface of the gas diffusion layer is pressed tightly by the pressing plate of the clamp, so that on one hand, the assembly condition in the battery is simulated, and on the other hand, the surface of the gas diffusion layer is ensured not to be influenced by the immersion liquid, and therefore the electric conductivity of the gas diffusion layer is ensured.
Further, the t is 1 Is 20min; t is said 2 It is 20min.
Through the technical scheme, the impregnation liquid can be fully diffused inside the gas diffusion layer, and the uniform impregnation effect is ensured.
Furthermore, the raw materials of the impregnation liquid comprise any one of a water repellent, a water retention agent or a mixture of the water repellent, sodium carboxymethyl cellulose and polyethylene acrylic acid; the mass ratio of the water repellent to the sodium carboxymethyl cellulose to the polyethylene acrylic acid is 1 (0.19-0.22) to 0.28-0.32.
Further, the water repellent is at least one of polytetrafluoroethylene, polyvinylidene fluoride, polychlorotrifluoroethylene, a copolymer of tetrafluoroethylene and hexafluoropropylene, and a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether;
the water-retaining agent is nitric acid and hydrophilic SiO 2 Hydrophilic TiO 2 2 Hydrophilic SnO 2 And a hydrophilic organic material.
Further, the hydrophilic organic material is any one of polyvinyl alcohol, cellulose and agarose.
Further, the pressing plate is an elastic pad with the hardness of 5-60 degrees.
Through the technical scheme, the use environment of the gas diffusion layer in the fuel cell can be simulated, so that the conductive network of the gas diffusion layer is the same as that in the fuel cell. And the two pressing plates adopt soft elastic pads, so that the surfaces of the microporous layer and the supporting layer of the gas diffusion layer can be well covered and protected from being soaked by the soaking liquid, and the soaking liquid can not influence the conductivity of the gas diffusion layer in the treatment process, namely the conductivity of the gas diffusion layer is unchanged before and after treatment.
Furthermore, the elastic pad is made of any one of silica gel, rubber, soft polyvinyl chloride and thermoplastic elastomer.
Through the technical scheme, the pressing plate material has certain deformation and limited heat-resisting temperature. The choice of press plate material is related to the choice of impregnation fluid and whether a heat treatment is required. For example, when the impregnation liquid is polyvinylidene fluoride-containing impregnation liquid, the temperature requirement on the pressing plate material is higher than the treatment temperature of polyvinylidene fluoride in the impregnation liquid, namely about 180 ℃, so that acrylate rubber (resisting 200 ℃ for a short time) can be used as the pressing plate material, the treatment at 180 ℃ can be ensured for 10 minutes, and the pressing plate material is not influenced.
Further, the rubber comprises any one of ethylene propylene sponge rubber, nitrile sponge rubber, silica gel sponge rubber, natural rubber and the like, and thermoplastic rubber.
Furthermore, the elastic pad is made of silica gel.
Through the technical scheme, the silica gel pad is relatively soft, so that the microporous layer and the surface of the supporting layer of the gas diffusion layer can be well covered and protected from being soaked by the immersion liquid, and the electric conduction condition of the gas diffusion layer in the battery when the gas diffusion layer is compressed is simulated.
The second invention provides a gas diffusion layer with enhanced water management capability obtained by the preparation method.
The invention also provides the application of the gas diffusion layer with enhanced water management capability in a fuel cell.
In the technical scheme of the invention, the real environment of the gas diffusion layer in the fuel cell is simulated, and the conductive network of the gas diffusion layer is the same as that in the fuel cell. Meanwhile, the pressing plates on the two sides of the gas diffusion layer adopt soft elastic cushions which can well cover and protect the micro-porous layer of the gas diffusion layer and the surface of the supporting layer from being soaked by the soaking liquid, so that the soaking liquid can not influence the conductivity of the gas diffusion layer in the treatment process, namely the conductivity of the gas diffusion layer is unchanged before and after the soaking liquid is treated. The technical scheme of the invention has simple steps and strong operability.
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 illustrating an impregnation process of a gas diffusion layer for enhancing water management capability according to one embodiment.
Fig. 2 is a Through-plane resistance plot of the gas diffusion layers prepared in example one and comparative example one.
Fig. 3 is a Through-plane resistance plot of the gas diffusion layers prepared in example two and comparative example one.
Fig. 4 is a Through-plane resistance plot of the gas diffusion layers prepared in example three and comparative example one.
Fig. 5 is a Through-plane resistance plot of the gas diffusion layers prepared in example four and comparative example one.
Fig. 6 is a plot of the Through-plane resistance of the gas diffusion layers prepared in example five and comparative example one.
Fig. 7 is a plot of the Through-plane resistance of the gas diffusion layers prepared in comparative example two and comparative example one.
Fig. 8 is a Through-plane resistance plot of the gas diffusion layers prepared in comparative example three and comparative example one.
Fig. 9 is a graph showing the performance of the batteries of examples one, two and five and comparative examples one and two.
Fig. 10 is a graph showing the performance of the batteries of examples three and four and comparative examples one and three.
Figure 11 is a top view of a gas diffusion layer and a fixture with enhanced water management capabilities according to one embodiment.
Wherein, 1, a microporous layer; 2. a support layer; 3. an upper pressure plate; 4. pressing the plate downwards; 5. and (4) clamping.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.
The experimental procedures in the following examples are conventional unless otherwise specified. The test materials and reagents used in the following examples, etc., are commercially available unless otherwise specified. In the quantitative tests in the following examples, three replicates were set, and the data are the mean or the mean ± standard deviation of the three replicates.
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, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those 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.
The untreated gas diffusion layers used in the first to fifth examples and the first to third comparative examples of the present application adopt GDL-S-20 produced by general hydrogen energy technology ltd, shenzhen, and are denoted as GDL-0.
Example one
S1, diluting a vinylidene fluoride (PVDF) emulsion to obtain 1wt% PVDF, and performing stirring dispersion for 30min and ultrasonic dispersion for 1h to obtain a hydrophobic impregnation solution.
S2, GDL-0 comprises a microporous layer and a supporting layer, the surface of GDL-0 is respectively provided with an upper pressing plate and a lower pressing plate which are closely attached to the surface of GDL-0, and the structure of the GDL-0 is shown in figure 1. The upper and lower pressing plates and GDL-0 are placed in a fixture made of transparent acrylic material, and the structure of the fixture is shown in FIG. 11. The clamp applies pressure to the upper and lower pressing plates, and the upper and lower pressing plates are subjected to uniform pressure of 0.8MPa, wherein P in figure 1 is represented as pressure. The gas diffusion layer comprises a first side and a second side opposite to the first side, the hydrophobic impregnation liquid prepared in the step S1 is introduced from the first side and the second side in sequence, as shown in fig. 1 and 11, the direction of the hollow arrow is the flowing direction of the impregnation liquid, t 1 The time for the immersion fluid to flow from the first side to the second side; changing the direction of flow of the impregnating liquid, t 2 The flowing condition of the impregnating solution is observed through the transparent clamp for the time that the impregnating solution flows from the second side to the first side so as to ensure that the impregnating effect is uniform, t 1 And t 2 All for 20min.
And S3, introducing nitrogen, sintering at 180 ℃ for 0.5min, and relieving pressure to obtain the gas diffusion layer with enhanced water management capacity, wherein the gas diffusion layer is marked as GDL-1.
The Through-plane resistance of GDL-1 was tested and the results are shown in FIG. 2.
The 2 GDL-1 and CCM were packaged into a membrane electrode assembly and assembled into a cell, which was tested for high humidity high electrical density cell performance at 100kPa, 80 ℃ and 100% RH metric ratio of 1.3/2.0, with the results shown in FIG. 9.
The difference between the second embodiment and the first embodiment is that:
s1, diluting the emulsion of vinylidene fluoride (PVDF) to obtain 8wt% of PVDF 1 And t 2 All for 40min.
The enhanced water management gas diffusion layer prepared in example two was designated GDL-2.
GDL-2 was tested for Through-plane resistance and the results are shown in FIG. 3.
The 2 GDL-2 and CCM were packaged into a membrane electrode assembly and assembled into a cell, which was tested for high humidity high electrical density cell performance at 100kPa, 80 ℃ and 100% RH metric ratio of 1.3/2.0, with the results shown in FIG. 9.
The difference between the third embodiment and the first embodiment is that:
s1, adding concentrated nitric acid (HNO) 3 ) Diluting to obtain 1wt% nitric acid impregnation liquid, and controlling the temperature of the nitric acid impregnation liquid to be 80 ℃.
S2、t 1 And t 2 All for 40min.
And S3, introducing deionized water for cleaning, introducing nitrogen, drying at 80 ℃ for 0.5min, and relieving pressure to obtain the gas diffusion layer with enhanced water management capacity, which is marked as GDL-3.
The Through-plane resistance of GDL-3 was tested and the results are shown in FIG. 4.
The 2 sheets of GDL-3 and CCM were packaged into a membrane electrode and assembled into a cell, which was tested for low-humidity cell performance (air-cooled cell) at 100kPa, 80 ℃, 20% RH gauge of 1.3/13.0, and the results are shown in FIG. 10.
The difference between the fourth embodiment and the third embodiment is that:
s1, adding concentrated nitric acid (HNO) 3 ) Diluting to obtain 8wt% nitric acid impregnation liquid.
The enhanced water management gas diffusion layer prepared in example four was designated GDL-4.
GDL-4 was tested for Through-plane resistance and the results are shown in FIG. 5.
The 2 sheets of GDL-4 and CCM were packaged into a membrane electrode and assembled into a cell, which was tested for low-humidity cell performance (air-cooled cell) at 100kPa, 80 ℃ and 20% RH gauge of 1.3/13.0, and the results are shown in FIG. 10.
The difference between the fifth embodiment and the first embodiment is that:
s1, diluting a vinylidene fluoride (PVDF) emulsion to obtain 1wt% PVDF, then adding sodium carboxymethylcellulose and polyethylene acrylic acid, wherein the mass ratio of the vinylidene fluoride to the sodium carboxymethylcellulose to the polyethylene acrylic acid is 1.2 1 And t 2 All for 30min.
And S3, introducing nitrogen, sintering at 180 ℃ for 0.5min, and relieving pressure to obtain the gas diffusion layer with enhanced water management capacity, wherein the gas diffusion layer is marked as GDL-5.
The Through-plane resistance of GDL-5 was tested and the results are shown in FIG. 6.
The 2 GDL-5 and CCM were packaged into a membrane electrode and assembled into a cell, which was tested for high humidity high electrical density cell performance at 100kPa, 80 ℃ and 100% RH metric ratio of 1.3/2.0, with the results shown in FIG. 9.
Comparative example 1
The gas diffusion layer is GDL-0.
The Through-plane resistance of GDL-0 was tested and the results are shown in FIG. 2.
The 2 GDL-0 and CCM were packaged into a membrane electrode and assembled into a cell, which was tested for high-humidity, high-density cell performance at 100kPa, 80 ℃ and 100% RH gauge of 1.3/2.0, with the results shown in FIG. 9; the battery was tested for low-humidity battery performance (air-cooled battery) at 100kPa, 80 ℃ and 20% RH gauge of 1.3/13.0, and the results are shown in FIG. 10.
Comparative example No. two
And (3) placing the GDL-0 in 8wt% of PVDF, sintering for 0.5min at 180 ℃, and cleaning and drying to obtain the GDL-6 serving as the gas diffusion layer.
The Through-plane resistance of GDL-6 was tested and the results are shown in FIG. 7.
The 2 sheets of GDL-6 and CCM were packaged into a membrane electrode and assembled into a cell, which was tested for cell performance at 100kPa, 80 ℃ and 100% RH gauge of 1.3/2.0 at high humidity and high electrical density, and the results are shown in FIG. 9.
Comparative example No. three
GDL-0 was placed at 8wt% HNO 3 And (5) performing water bath at 80 ℃ for 80min, and cleaning and drying to obtain the gas diffusion layer GDL-7.
The Through-plane resistance of GDL-7 was tested and the results are shown in FIG. 8.
The 2 sheets of GDL-7 and CCM were packaged into a membrane electrode and assembled into a cell, which was tested for low-humidity, high-density cell performance at 100kPa, 80 ℃, 20% RH gauge of 1.3/2.0, and the results are shown in FIG. 10.
And (4) analyzing results:
(1) GDL-0 is an untreated sample, GDL-1, GDL-2, GDL-5 are gas diffusion layers prepared by impregnating PVDF impregnation solution or a mixed impregnation solution of PVDF, sodium carboxymethyl cellulose, and polyethylene acrylic acid, and GDL-6 is a gas diffusion layer obtained by coating PVDF on a substrate layer by a coating method.
As shown in fig. 2 and 3, the resistance at 1000kPa (cell assembly pressure, i.e., GDL resistance during use) is the same, while the resistance of GDL-6 of fig. 7 is significantly increased.
As shown in fig. 9, the battery performance: GDL-5 >. That is, the performances of GDL-1 and GDL-2 fully impregnated with PVDF impregnation solution are greater than those of untreated GDL-0, while the simple method of coating PVDF does not improve the battery performance but reduces the battery performance.
Meanwhile, the performance of GDL-5 >.
(2) GDL-0 is an untreated sample and GDL-3, GDL-4 are gas diffusion layers made using the impregnation method of the present application.
As shown in fig. 4 and 5, the resistance at 1000kPa (cell assembly pressure, i.e., the resistance of GDL during use) is the same. The same impregnation liquid and impregnation conditions are adopted for GDL-7 and GDL-4, but the impregnation methods are different, so that the resistance of GDL-7 in figure 8 is obviously increased, and the impregnation method can improve the hydrophilicity of the gas diffusion layer under the condition of ensuring that the resistance of the gas diffusion layer is not changed.
As shown in fig. 10, the battery performance: GDL-4>GDL-3>GDL-0>GDL-7. I.e. by HNO 3 The performances of GDL-3 and GDL-4 fully impregnated by the impregnation liquid are greater than those of untreated GDL-0; by simple immersion in HNO 3 The method in the immersion liquid not only fails to improve the battery performance, but also decreases the battery performance.
All possible combinations of the technical features of the above embodiments may not be described in the above embodiments for the sake of brevity, however, the combination of the technical features should be considered as the scope of the present specification unless there is any conflict between the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. A method of preparing a gas diffusion layer for enhanced water management comprising at least the steps of:
s1, preparing a steeping liquor with the concentration of 1-8 wt%;
s2, placing the gas diffusion layer in a clamp with pressing plates arranged at the upper part and the lower part, wherein the 2 pressing plates are closely attached to the upper surface and the lower surface of the gas diffusion layer, and then uniformly applying pressure of 0.5-3MPa to the surface of the gas diffusion layer; wherein the gas diffusion layer comprises a first side and a second side opposite to the first side, usingThe pump leads the impregnation liquid prepared in the step S1 in turn from the first side edge, the second side edge flows out, t 1 The time for the immersion fluid to flow from the first side to the second side; then the liquid flows in from the second side edge and flows out from the first side edge, t 2 The time for the maceration extract to flow from the second side to the first side, wherein the flow rate of the maceration extract is 20-120mL/min;
s3, stopping liquid supply after the impregnation is finished, and standing to discharge redundant impregnation liquid; and (3) placing the fixture and the gas diffusion layer in the step (S2) in a nitrogen environment, sintering for 0.5-90min at the temperature of 80-180 ℃, and then releasing pressure to take out the gas diffusion layer to obtain the gas diffusion layer with enhanced water management capability.
2. The method of preparing a gas diffusion layer for enhanced water management according to claim 1, wherein: t is said 1 Is 20-100min; said t is 2 Is 20-100min.
3. The method of preparing a gas diffusion layer for enhanced water management according to claim 1, wherein:
the raw materials of the dipping solution comprise any one of a water repellent, a water retention agent or a mixture of the water repellent, sodium carboxymethyl cellulose and polyethylene acrylic acid; the mass ratio of the water repellent to the sodium carboxymethyl cellulose to the polyethylene acrylic acid is 1 (0.19-0.22) to 0.28-0.32.
4. The method of preparing a gas diffusion layer for enhanced water management according to claim 3, wherein:
the water repellent is at least one of polytetrafluoroethylene, polyvinylidene fluoride, polychlorotrifluoroethylene, a copolymer of tetrafluoroethylene and hexafluoropropylene, and a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether;
the water-retaining agent is nitric acid and hydrophilic SiO 2 Hydrophilic TiO 2 2 Hydrophilic SnO 2 And a hydrophilic organic material.
5. The method of preparing a gas diffusion layer for enhanced water management according to claim 4, wherein:
the hydrophilic organic material is any one of polyvinyl alcohol, cellulose and agarose.
6. The method of preparing a gas diffusion layer for enhanced water management according to claim 1, wherein: the pressing plate is an elastic cushion with the hardness of 5-60 degrees.
7. The method of preparing a gas diffusion layer for enhanced water management according to claim 6, wherein: the elastic cushion is made of any one of silica gel, rubber, soft polyvinyl chloride and thermoplastic elastomer.
8. A gas diffusion layer for enhanced water management prepared by the method of any one of claims 1 to 7.
9. Use of a gas diffusion layer according to claim 8 for enhanced water management in a fuel cell.
CN202211155314.XA 2022-09-22 2022-09-22 Preparation method of gas diffusion layer for enhancing water management capacity and application of gas diffusion layer in fuel cell Pending CN115377439A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116706102A (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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116706102A (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
CN116706102B (en) * 2023-08-01 2023-12-19 深圳市通用氢能科技有限公司 Preparation method and application of gas diffusion layer for fuel cell

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