CN113745527A - Gas diffusion layer and preparation method and application thereof - Google Patents
Gas diffusion layer and preparation method and application thereof Download PDFInfo
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- CN113745527A CN113745527A CN202110863287.0A CN202110863287A CN113745527A CN 113745527 A CN113745527 A CN 113745527A CN 202110863287 A CN202110863287 A CN 202110863287A CN 113745527 A CN113745527 A CN 113745527A
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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
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1007—Fuel cells with solid electrolytes with both reactants being gaseous or vaporised
-
- 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
Abstract
The invention particularly relates to a gas diffusion layer and a preparation method and application thereof, belonging to the technical field of fuel cells, wherein the method comprises the following steps: dipping the basal layer in a dipping solution for pretreatment, and then carrying out first drying to obtain a pretreated basal layer; the dipping solution is a water repellent solution, and the dipping time is 20min-40 min; mixing a pore-forming agent, conductive carbon black and a water repellent in a dispersion liquid to obtain microporous layer slurry; coating the microporous layer slurry on the pretreated substrate layer slurry in a screen printing mode to obtain a gas diffusion layer; the coating times are at least 2, the second drying and roasting are carried out after each coating, the microporous layer slurry is coated for many times by adopting screen printing, the thickness uniformity of the microporous layer slurry is improved, the contact area between the GDL and the catalyst layer is increased, the contact resistance between the gas diffusion layer and the catalyst layer is reduced, and therefore the requirement of improving the performance of the membrane electrode is met.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a gas diffusion layer and a preparation method and application thereof.
Background
As the total amount of automobiles continuously rises and pollution is continuously aggravated, the importance of developing a new energy vehicle is self-evident, and hydrogen energy with cleanness, high efficiency and wide sources is an important direction of the energy revolution in China. The development of hydrogen fuel cell vehicles is a breakthrough for popularizing the use of hydrogen energy, and the fuel cell vehicles have a plurality of advantages, namely zero emission or near zero emission, and reduce water pollution caused by engine oil leakage, thereby reducing the emission of greenhouse gases. It also improves engine combustion efficiency. The operation process is stable and noiseless. To promote the accelerated development of the fuel cell automobile industry, the policy guidance continues to be provided in china recently.
As a core component of a fuel cell vehicle, the performance of a Proton Exchange Membrane Fuel Cell (PEMFC) is poor and good, which directly affects the overall performance of the fuel cell vehicle, while in the Proton Exchange Membrane Fuel Cell (PEMFC), the performance of a Gas Diffusion Layer (GDL) also affects the overall performance of the proton exchange membrane fuel cell.
In the process of evaluating the GDL, the thickness uniformity is an important index, and the thickness uniformity influences the porosity and the pore size distribution of the GDL, so that the overall performance of the cell is influenced, and therefore, it is very important to prepare the gas diffusion layer with good thickness uniformity to ensure that the performance of the membrane electrode is not influenced.
Disclosure of Invention
The present application is directed to a gas diffusion layer, a method for preparing the same, and an application thereof, so as to improve the thickness uniformity of the gas diffusion layer, thereby improving the performance of a fuel cell.
The embodiment of the invention provides a preparation method of a gas diffusion layer, which comprises the following steps:
dipping the basal layer in a dipping solution for pretreatment, and then carrying out first drying to obtain a pretreated basal layer; the dipping solution is a water repellent solution, and the dipping time is 20min-40 min;
mixing a pore-forming agent, conductive carbon black and a water repellent in a dispersion liquid to obtain microporous layer slurry;
coating the microporous layer slurry on the pretreated substrate layer slurry in a screen printing mode to obtain a gas diffusion layer; the number of said coats is at least 2, each coat is followed by a second drying and baking.
Optionally, the second drying temperature is 55-65 ℃, the second drying time is 50-70 min, the roasting temperature is 250-350 ℃, and the roasting time is 150-210 min.
Optionally, the weight content of the water repellent in the microporous layer of the gas diffusion layer is 15% to 30%.
Optionally, the water repellent solution comprises at least one of a polytetrafluoroethylene solution, a polyvinylidene fluoride solution and a copolymer solution of tetrafluoroethylene and ethylene, and the solvent of the water repellent solution is at least one of ethanol, isopropanol and ethylene glycol; the substrate layer is carbon paper or carbon cloth.
Optionally, the mass content of the water repellent of the pretreated substrate layer is 2% -10%.
Optionally, the temperature of the first drying is 55-65 ℃, and the time of the first drying is 50-70 min.
Optionally, the pore-forming agent comprises at least one of ethylene glycol, ammonium carbonate and ammonium bicarbonate;
the conductive carbon Black comprises at least one of acetylene Black, Vulcan XC-72, Black pearls and carbon nanotubes;
the water repellent comprises at least one of polytetrafluoroethylene, polyvinylidene fluoride and a copolymer of tetrafluoroethylene and ethylene;
the dispersion includes at least one of ethanol, isopropanol, and ethylene glycol.
Optionally, the mass ratio of the conductive carbon black to the water repellent is 3:1-10: 1; the mass ratio of the conductive carbon black to the dispersion liquid is 1:10-1:30, and the mass ratio of the conductive carbon black to the pore-forming agent is 4:1-20: 1.
Based on the same inventive concept, the embodiment of the invention also provides a gas diffusion layer, and the gas diffusion layer is prepared by adopting the preparation method of the gas diffusion layer.
Based on the same inventive concept, the embodiment of the invention also provides an application of the gas diffusion layer, and the application comprises the step of using the gas diffusion layer as described above to prepare a proton exchange membrane fuel cell.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the preparation method of the gas diffusion layer provided by the embodiment of the invention comprises the following steps: dipping the basal layer in a dipping solution for pretreatment, and then carrying out first drying to obtain a pretreated basal layer; the dipping solution is a water repellent solution, and the dipping time is 20min-40 min; mixing a pore-forming agent, conductive carbon black and a water repellent in a dispersion liquid to obtain microporous layer slurry; coating the microporous layer slurry on the pretreated substrate layer slurry in a screen printing mode to obtain a gas diffusion layer; the coating times are at least 2, the second drying and roasting are carried out after each coating, the microporous layer slurry is coated for many times by adopting screen printing, the thickness uniformity of the microporous layer slurry is improved, the contact area between the GDL and the catalyst layer is increased, the contact resistance between the gas diffusion layer and the catalyst layer is reduced, and therefore the requirement of improving the performance of the membrane electrode is met.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
FIG. 2 is a polarization diagram of gas diffusion layers provided in example 1 and comparative example 1 provided in examples of the present invention;
FIG. 3 is a polarization diagram of gas diffusion layers provided in example 2 and comparative example 2 according to an embodiment of the present invention;
fig. 4 is a polarization graph of gas diffusion layers provided in example 3 and comparative example 3 provided in the example of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the applicant finds in the course of the invention that: the main reasons for influencing the printing thickness are printing speed, printing pressure (doctor blade pressure), curing time, curing temperature, mesh number and the like, if the mesh number is reduced, the thickness can be increased, but the printing quality, such as the uniformity of the thickness, is reduced, and the creative discovery of the applicant is that: by adopting a mode of printing for multiple times, the gas diffusion layer with better thickness uniformity can be obtained.
According to an exemplary embodiment of the present invention, there is provided a method of preparing a gas diffusion layer, the method including:
s1, dipping a basal layer in a dipping solution for pretreatment, and then performing first drying to obtain a pretreated basal layer; the dipping solution is a water repellent solution, and the dipping time is 20min-40min, preferably 30 min;
as an alternative embodiment, the water repellent solution comprises at least one of a polytetrafluoroethylene solution, a polyvinylidene fluoride solution and a copolymer solution of tetrafluoroethylene and ethylene, and the solvent of the water repellent solution is at least one of ethanol, isopropanol and ethylene glycol; the substrate layer is carbon paper or carbon cloth.
As an optional embodiment, the mass content of the water repellent in the pretreated substrate layer is 2% to 10%, specifically, the content values include but are not limited to: 2%, 4%, 6%, 8%, 10%, etc.
The reason why the mass content of the water repellent of the pre-treated base layer is controlled to be 2% to 10% is that in this range, the bonding degree of the base material and the microporous layer is optimal, and too large a content thereof may deteriorate the performance of the gas diffusion layer, and too small an adverse effect thereof may deteriorate the bonding degree of the base material and the microporous layer.
As an alternative embodiment, the temperature of the first drying is 55 ℃ to 65 ℃, preferably 60 ℃, and the time of the first drying is 50min to 70min, preferably 60 min.
The base layer is pretreated to enhance the bonding of the substrate to the microporous layer.
S2, mixing the pore-forming agent, the conductive carbon black and the water repellent in the dispersion liquid to obtain microporous layer slurry;
as an alternative embodiment, the pore-forming agent includes ethylene glycol, ammonium carbonate, ammonium bicarbonate, and the like.
The conductive carbon Black comprises at least one of acetylene Black, Vulcan XC-72, Black pearls and carbon nano tubes;
the water repellent comprises at least one of polytetrafluoroethylene, polyvinylidene fluoride and a copolymer of tetrafluoroethylene and ethylene;
the dispersion includes at least one of ethanol, isopropanol, and ethylene glycol.
As an alternative embodiment, the mass ratio of the conductive carbon black to the water repellent is 3:1 to 10:1, specifically, the ratio includes but is not limited to: 3: 1. 4: 1. 5: 1. 6: 1. 7: 1. 8: 1. 9: 1 and 10:1, etc.; the mass ratio of the conductive carbon black to the dispersion is 1:10 to 1:30, specifically, the ratio includes but is not limited to: 1: 10. 1: 15. 1: 20. 1: 25 and 1:30, etc.; the mass ratio of the conductive carbon black to the pore-forming agent is 4:1-20:1, and specifically, the ratio includes but is not limited to: 4: 1. 10: 1. 15: 1 and 20:1, etc.
The mass ratio of the conductive carbon black to the water repellent is controlled to be 3:1-10:1, too large a value of the ratio can cause poor hydrophobicity, and too small a value can cause poor conductivity.
The mass ratio of the conductive carbon black to the dispersion liquid is controlled to be 1:10-1:30, and the porosity and the performance of a gas diffusion layer are reduced due to overlarge ratio, and the conductivity is reduced due to undersize ratio.
The mass ratio of the conductive carbon black to the pore-forming agent is controlled to be 4:1-20:1, the ratio is too large to facilitate the removal of water, and too small can cause the reduction of structural strength and the deterioration of conductivity.
S3, coating the microporous layer slurry on the pretreated base layer slurry in a screen printing mode to obtain a gas diffusion layer; the number of said coats is at least 2, each coat is followed by a second drying and baking.
As an alternative embodiment, the temperature of the second drying is 55 ℃ to 65 ℃, preferably 60 ℃, the time of the second drying is 50min to 70min, preferably 60min, the temperature of the roasting is 250 ℃ to 350 ℃, preferably 300 ℃, and the time of the roasting is 150min to 210min, preferably 180 min. The gas diffusion layer of the present application, and the preparation method and application thereof will be described in detail below with reference to examples, comparative examples, and experimental data.
Example 1
A method of preparing a gas diffusion layer comprising the steps of:
(1) pretreatment of the substrate layer: soaking the base layer material in a PTFE solution with the mass fraction of 15%, placing the soaked base layer material in an oven after 30 minutes, drying the base layer material at 60 ℃ for 1 hour, and repeating the step to ensure that the content of PETF in the pretreated carbon paper is 5.5%;
(2) preparing microporous layer slurry: mixing a pore-forming agent isopropanol and Vulcan XC-72 carbon powder in a mass ratio of 3:1, then carrying out magnetic stirring to obtain slurry A, adding a pore-forming agent glycol and PTFE emulsion with solid content of 60% into the slurry A dispersed to a certain degree, continuing carrying out magnetic stirring, and carrying out ball milling to obtain uniformly dispersed microporous layer slurry;
(3) preparation of a gas diffusion layer: and (3) screen printing the microporous layer slurry obtained in the step (2) by two times, firstly fixing the substrate layer in a magnetic attraction mode, taking out the substrate layer after the first time of printing is finished, drying the substrate layer in an oven at 60 ℃ for 1h, then putting the substrate layer in a box type resistance furnace, heating to 300 ℃ for roasting for 3h, carrying out second time of screen printing, drying the substrate layer in the oven at 60 ℃ for 1h, then putting the substrate layer in the box type resistance furnace, heating to 300 ℃ for roasting for 3h, and preparing the final gas diffusion layer, wherein the PFTE content in the microporous layer is 21.5%.
Example 2
A method of preparing a gas diffusion layer comprising the steps of:
(1) pretreatment of the substrate layer: soaking the base layer material in a PTFE solution with the mass fraction of 15%, placing the soaked base layer material in an oven after 30 minutes, drying the base layer material at 60 ℃ for 1 hour, and repeating the step to ensure that the content of PETF in the pretreated carbon paper is 5.5%;
(2) preparing microporous layer slurry: mixing a pore-forming agent isopropanol and Vulcan XC-72 carbon powder in a mass ratio of 7:1, then carrying out magnetic stirring to obtain slurry A, adding a pore-forming agent glycol and PTFE emulsion with solid content of 60% into the slurry A dispersed to a certain degree, continuing carrying out magnetic stirring, and carrying out ball milling to obtain uniformly dispersed microporous layer slurry;
(3) preparation of a gas diffusion layer: and (3) screen printing the microporous layer slurry obtained in the step (2) by two times, firstly fixing the substrate layer in a magnetic attraction mode, taking out the substrate layer after the first time of printing is finished, drying the substrate layer in an oven at 60 ℃ for 1h, then putting the substrate layer in a box type resistance furnace, heating to 300 ℃ for roasting for 3h, carrying out second time of screen printing, drying the substrate layer in the oven at 60 ℃ for 1h, then putting the substrate layer in the box type resistance furnace, heating to 300 ℃ for roasting for 3h, and preparing the final gas diffusion layer, wherein the PFTE content in the microporous layer is 21.5%.
Example 3
A method of preparing a gas diffusion layer comprising the steps of:
(1) base layer pretreatment: soaking the substrate layer material in a PTFE solution with the mass fraction of 15%, placing the substrate layer material in an oven after 30 minutes of soaking, drying the substrate layer material at 60 ℃ for 1 hour, and repeating the steps to ensure that the content of PETF in the pretreated carbon paper is 5.5%;
(2) preparing microporous layer slurry: mixing a pore-forming agent isopropanol with Vulcan XC-72 carbon powder, then carrying out magnetic stirring to obtain slurry A, adding a pore-forming agent ethylene glycol and PTFE emulsion with the solid content of 60% into the slurry A dispersed to a certain degree, continuing carrying out magnetic stirring, and carrying out ball milling to obtain uniformly dispersed microporous layer slurry;
(3) preparation of a gas diffusion layer: directly forming the microporous layer slurry obtained in the step (2) on the base layer obtained by pretreatment in the step (1) in a screen printing mode; drying in an oven at 60 deg.C for 1h, and calcining at 300 deg.C for 3h to obtain the gas diffusion layer with PTFE content of 21.5%.
Comparative example 1
A method of preparing a gas diffusion layer comprising the steps of:
(1) base layer pretreatment: soaking the substrate layer material in a PTFE solution with the mass fraction of 15%, placing the substrate layer material in an oven after 30 minutes of soaking, drying the substrate layer material at 60 ℃ for 1 hour, and repeating the steps to ensure that the content of PETF in the pretreated carbon paper is 5.5%;
(2) preparing microporous layer slurry: mixing isopropanol and Vulcan XC-72 carbon powder, then carrying out magnetic stirring to obtain slurry A, adding a pore-forming agent ethylene glycol and PTFE emulsion with the solid content of 60% into the slurry A dispersed to a certain degree, continuing carrying out magnetic stirring, and carrying out ball milling to obtain uniformly dispersed microporous layer slurry;
(3) preparation of a gas diffusion layer: directly forming the microporous layer slurry obtained in the step (2) on the base layer obtained by pretreatment in the step (1) in a screen printing mode; drying in an oven at 60 deg.C for 1h, and calcining at 300 deg.C for 3h to obtain the gas diffusion layer with PTFE content of 21.5%.
Comparative example 2
A method of preparing a gas diffusion layer comprising the steps of:
(1) base layer pretreatment: soaking the substrate layer material in a PTFE solution with the mass fraction of 15%, placing the substrate layer material in an oven after 30 minutes of soaking, drying the substrate layer material at 60 ℃ for 1 hour, and repeating the steps to ensure that the content of PETF in the pretreated carbon paper is 5.5%;
(2) preparing microporous layer slurry: mixing a pore-forming agent isopropanol with Vulcan XC-72 carbon powder, then carrying out magnetic stirring to obtain slurry A, adding a pore-forming agent ethylene glycol and PTFE emulsion with the solid content of 60% into the slurry A dispersed to a certain degree, continuing carrying out magnetic stirring, and carrying out ball milling to obtain uniformly dispersed microporous layer slurry;
(3) preparation of a gas diffusion layer: directly forming the microporous layer slurry obtained in the step (2) on the base layer obtained by pretreatment in the step (1) in a screen printing mode; drying in an oven at 60 deg.C for 1h, and calcining at 300 deg.C for 3h to obtain the gas diffusion layer with PTFE content of 21.5%.
Comparative example 3
A method of preparing a gas diffusion layer comprising the steps of:
(1) base layer pretreatment: soaking the substrate layer material in a PTFE solution with the mass fraction of 15%, placing the substrate layer material in an oven after 30 minutes of soaking, drying the substrate layer material at 60 ℃ for 1 hour, and repeating the steps to ensure that the content of PETF in the pretreated carbon paper is 5.5%;
(2) preparing microporous layer slurry: mixing isopropanol and Vulcan XC-72 carbon powder, then carrying out magnetic stirring to obtain slurry A, adding a pore-forming agent ethylene glycol and PTFE emulsion with the solid content of 60% into the slurry A dispersed to a certain degree, continuing carrying out magnetic stirring, and carrying out ball milling to obtain uniformly dispersed microporous layer slurry;
(3) preparation of a gas diffusion layer: directly forming the microporous layer slurry obtained in the step (2) on the base layer obtained by pretreatment in the step (1) in a screen printing mode; drying in an oven at 60 deg.C for 1h, and calcining at 300 deg.C for 3h to obtain the gas diffusion layer with PTFE content of 21.5%.
Examples of the experiments
From the gas diffusion layers prepared in examples 1 to 3 and comparative examples 1 to 3, 9 pieces were optionally subjected to a thickness test, and the test results are as follows:
from the above table, it can be seen that the thickness uniformity of examples 1, 2 and 3 is better as the thickness standard deviation of examples 1, 2 and 3 is significantly smaller than that of comparative examples 1, 2 and 3.
The gas diffusion layers prepared in examples 1 to 3 and comparative examples 1 to 3 were tested under the following conditions: the temperature of the battery is 80 ℃, the anode is 100% RH, the anode gas is hydrogen, the anode flow is 210cc/min, the anode excess coefficient is 1.5, and the anode back pressure is 150 kPa; the cathode is 100% RH, the cathode gas is air, the cathode flow is 500cc/ml, the cathode excess coefficient is 2.5, and the cathode back pressure is 150 kPa; polarization curves were obtained and the results are shown in fig. 2 to 4.
As can be seen from the polarization graphs tested, example 1 was at 2000mA/cm2At a current density of 0.550V, comparative example 1 at 2000mA/cm2The voltage of example 1 is higher than that of comparative example 1 by about 8.1%, and the voltage of example 2 is increased by 2000mA/cm at a current density of 0.509V2At a current density of 0.537V, comparative example 2 at 2000mA/cm2The voltage of example 2 is greater than that of comparative example 2 by about 7.4%, and the voltage of example 3 is at 2000mA/cm2At a current density of 0.553V, comparative example 3 at 2000mA/cm2The voltage of the current density of (1) was 0.482V, and the voltage of example 3 was largerAt the voltage of 3 of the comparative example, the increase is about 14.7%, and the performance is improved to a certain extent.
The applicant analyzed the reasons for this as: due to the improvement of the thickness uniformity of the embodiments 1, 2 and 3, the contact area between the GDL and the catalyst layer is increased, and the contact resistance between the gas diffusion layer and the catalyst layer is reduced, so that the requirement of improving the performance of the membrane electrode is met.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) the method provided by the embodiment of the invention adopts a mode of printing for many times to obtain the gas diffusion layer with better thickness uniformity;
(2) according to the gas diffusion layer provided by the embodiment of the invention, the contact area between the gas diffusion layer and the catalyst layer is increased, so that the contact resistance between the gas diffusion layer and the catalyst layer is reduced, and the requirement for improving the performance of the membrane electrode is met.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of preparing a gas diffusion layer, the method comprising:
dipping the basal layer in a dipping solution for pretreatment, and then carrying out first drying to obtain a pretreated basal layer; the dipping solution is a water repellent solution, and the dipping time is 20min-40 min;
mixing a pore-forming agent, conductive carbon black and a water repellent in a dispersion liquid to obtain microporous layer slurry;
coating the microporous layer slurry on the pretreated substrate layer slurry in a screen printing mode to obtain a gas diffusion layer; the number of said coats is at least 2, each coat is followed by a second drying and baking.
2. The method for preparing a gas diffusion layer according to claim 1, wherein the temperature of the second drying is 55 ℃ to 65 ℃, the time of the second drying is 50min to 70min, the temperature of the baking is 250 ℃ to 350 ℃, and the time of the baking is 150min to 210 min.
3. The method for preparing a gas diffusion layer according to claim 1 or 2, wherein the weight content of the water repellent in the microporous layer of the gas diffusion layer is 15% to 30%.
4. The method for preparing a gas diffusion layer according to claim 1, wherein the water repellent solution comprises at least one of a polytetrafluoroethylene solution, a polyvinylidene fluoride solution and a copolymer solution of tetrafluoroethylene and ethylene, and the solvent of the water repellent solution is at least one of ethanol, isopropanol and ethylene glycol; the substrate layer is carbon paper or carbon cloth.
5. The method for preparing a gas diffusion layer according to claim 1 or 4, wherein the mass content of the water repellent of the pretreated substrate layer is 2% to 10%.
6. The method for preparing a gas diffusion layer according to claim 1, wherein the temperature of the first drying is 55 ℃ to 65 ℃ and the time of the first drying is 50min to 70 min.
7. The method of preparing a gas diffusion layer according to claim 1, wherein the pore-forming agent includes at least one of ethylene glycol, ammonium carbonate, and ammonium bicarbonate;
the conductive carbon Black comprises at least one of acetylene Black, Vulcan XC-72, Black pearls and carbon nanotubes;
the water repellent comprises at least one of polytetrafluoroethylene, polyvinylidene fluoride and a copolymer of tetrafluoroethylene and ethylene;
the dispersion includes at least one of ethanol, isopropanol, and ethylene glycol.
8. The method for preparing a gas diffusion layer according to claim 1 or 7, wherein the mass ratio of the conductive carbon black to the water repellent is 3:1 to 10: 1; the mass ratio of the conductive carbon black to the dispersion liquid is 1:10-1:30, and the mass ratio of the conductive carbon black to the pore-forming agent is 4:1-20: 1.
9. A gas diffusion layer prepared by the method for preparing a gas diffusion layer according to any one of claims 1 to 8.
10. Use of a gas diffusion layer according to claim 9 for the preparation of a proton exchange membrane fuel cell.
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Application publication date: 20211203 |