CN113659157A - Membrane electrode and preparation method and application thereof - Google Patents
Membrane electrode and preparation method and application thereof Download PDFInfo
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- CN113659157A CN113659157A CN202110924554.0A CN202110924554A CN113659157A CN 113659157 A CN113659157 A CN 113659157A CN 202110924554 A CN202110924554 A CN 202110924554A CN 113659157 A CN113659157 A CN 113659157A
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- 239000012528 membrane Substances 0.000 title claims abstract description 85
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000006255 coating slurry Substances 0.000 claims abstract description 76
- 238000000576 coating method Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000011247 coating layer Substances 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims description 41
- 239000000654 additive Substances 0.000 claims description 25
- 230000000996 additive effect Effects 0.000 claims description 22
- 239000011347 resin Substances 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 16
- 239000002904 solvent Substances 0.000 claims description 16
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- 150000003460 sulfonic acids Chemical class 0.000 claims description 13
- 239000003054 catalyst Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 229920006267 polyester film Polymers 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007765 extrusion coating Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 claims description 2
- 150000001298 alcohols Chemical class 0.000 claims description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims description 2
- 210000000078 claw Anatomy 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 12
- 230000010287 polarization Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 4
- UQSQSQZYBQSBJZ-UHFFFAOYSA-N fluorosulfonic acid Chemical compound OS(F)(=O)=O UQSQSQZYBQSBJZ-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910002837 PtCo Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000002572 peristaltic effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920005597 polymer membrane Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
- H01M4/8825—Methods for deposition of the catalytic active composition
- H01M4/8828—Coating with slurry or ink
-
- 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
- H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
-
- 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
- H01M4/8647—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites
- H01M4/8657—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites layered
-
- 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
- H01M4/8663—Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Inert Electrodes (AREA)
- Fuel Cell (AREA)
Abstract
The invention relates to a membrane electrode and a preparation method and application thereof, wherein the membrane electrode comprises a base membrane and coatings arranged on one side or two sides of the base membrane; the coating layer is formed from a coating slurry; the difference of the surface tension of the base film and the coating slurry is more than 5mN/m, and the surface tension of the base film is more than that of the coating slurry. The membrane electrode has simple process, can solve the problems of claw shape, cracking and deformation, and improves the performance of the battery.
Description
Technical Field
The invention relates to the technical field of battery materials, in particular to a membrane electrode and a preparation method and application thereof.
Background
In membrane electrode production, die extrusion coating is a widely used coating method due to its advantages of high precision, wide coating window, high reliability, etc. Wherein the membrane electrode slurry is supplied by a precision feed system (e.g., peristaltic pump) and enters the cavity inside the die head and is uniformly distributed in the width direction of the coating, and finally the slurry is extruded through the slot of the die head to form the coating on the moving substrate. Due to the fluid characteristics of the slurry, the coating on the surface of a special substrate, such as a proton membrane, a PP (polypropylene) and other polymer membranes which are easy to absorb water and swell or a composite membrane, can cause the problems of claw shape, cracking, deformation and the like which influence the process production and the consistency of the battery performance.
CN109860676A discloses a membrane electrode structure, fuel cell and battery pile, belongs to the battery field. Membrane electrode structures are used in batteries, in particular fuel cells. The membrane electrode structure disclosed therein has a multilayer structure and includes a first electrode layer, a second electrode layer, and an electrolyte layer disposed in stacked contact in this order, the electrolyte layer being located between the first electrode layer and the second electrode layer. One and both of the first electrode layer and the second electrode layer have a network-like structure. Wherein the network-like structure comprises a layer of dividing material and an optional layer of electrode material. The dividing material layer has a coefficient of thermal expansion equal to or less than that of the electrolyte layer. The electrode and the electrolyte in the membrane electrode structure have high matching degree, and are not easy to be stripped and separated from each other due to large difference of thermal expansion.
In the prior art, many researches on solving the cracking problem of the membrane electrode exist, but the process is complex and the cost is high, and in conclusion, the development of the membrane electrode which is simple in process and can not crack and deform is very important.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a membrane electrode, a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a membrane electrode comprising a base membrane and a coating layer disposed on one or both sides of the base membrane;
the coating layer is formed from a coating slurry;
the difference in surface tension between the base film and the coating slurry is 5mN/m or more (e.g., 6mN/m, 8mN/m, 10mN/m, 12mN/m, 14mN/m, 16mN/m, 18mN/m, etc.), and the surface tension of the base film is greater than the surface tension of the coating slurry.
The difference value of the surface tension of the base film and the surface tension of the coating slurry of the membrane electrode is more than 5mN/m, and the surface tension of the base film and the surface tension of the coating slurry are controlled to be more than 5mN/m, so that the problems of claw shape, cracking and deformation of the membrane electrode can be solved, and the membrane electrode with less cracks and no bottom exposure can be obtained.
Preferably, the surface tension of the base film is 35 to 70mN/m, such as 36mN/m, 38mN/m, 40mN/m, 45mN/m, 50mN/m, 55mN/m, 60mN/m, 65mN/m, 68mN/m, and the like.
The surface tension of the base film is controlled to be 35-70mN/m, the reason is that the higher the surface energy of the base film is, the more easily the base film is wetted, but the too high surface tension of the base film can make the sizing agent not beneficial to leveling, the phenomenon of unevenness or surface unevenness is formed, the gradual temperature rise is needed, the baking time is prolonged, namely, the fluidity time is ensured to level and ensure the coating appearance, and the range of the base film is defined based on the surface tension of the coating sizing agent (7-25 mN/m).
Preferably, the surface tension of the coating slip is 7-25mN/m, such as 8mN/m, 10mN/m, 12mN/m, 14mN/m, 16mN/m, 18mN/m, 20mN/m, 22mN/m, 24 mN/etc.
The invention regulates the surface tension of the coating slurry to be in the range of 7-25mN/m, because the slurry is too high in surface tension and is less easy to spread.
Preferably, the coating has a thickness of 5-25 μm, such as 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 22 μm, and the like.
Preferably, the base film has a thickness of 7 to 15 μm, such as 8 μm, 10 μm, 10.5 μm, 11 μm, 11.5 μm, 12 μm, 14 μm, and the like.
Preferably, the base film comprises any one of or a combination of at least two of a proton exchange membrane, graphite paper, or polyester film provided with an adhesive coating on the surface thereof, wherein typical but non-limiting combinations include: the combination of the proton exchange membrane and the graphite paper, the combination of the graphite paper and the polyester film provided with the adhesive coating on the surface, and the combination of the proton exchange membrane, the graphite paper and the polyester film provided with the adhesive coating on the surface.
Preferably, the coating slurry comprises the following components in percentage by weight based on 100% of the total mass of the coating slurry: 5-25% of catalyst, 2-18% of perfluorinated sulfonic acid resin, 60-85% of solvent and 1-5% of additive.
The weight percent of the catalyst is 5% to 25%, e.g., 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, etc.
The weight percentage of the perfluorosulfonic acid resin is 2% -18%, for example, 4%, 6%, 7%, 8%, 10%, 12%, 14%, 16%, etc.
The weight percentage of the solvent is 60% to 85%, such as 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, and the like.
The weight percentage of the additive is 1% -5%, such as 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, etc.
"perfluorosulfonic acid resin 2% -18%" in the present invention means that a perfluorosulfonic acid resin solution having a solid content of 5% -20% (e.g., 5%, 8%, 10%, 12%, 15%, 18%, 20%, etc.), preferably 15% or 20% is used in a coating slurry at a mass percentage of 2% -18%.
Preferably, the coating slurry has a dynamic viscosity of 80 to 900mPa90, such as 100mPa m, 200mPa m, 300mPa m, 400mPa m, 500mPa m, 600mPa m, 700mPa m, 800mPa m, and the like.
Preferably, the coating slurry has a solids content of 15% to 25%, such as 16%, 18%, 20%, 22%, 24%, etc.
In a second aspect, the present invention provides a method for preparing the membrane electrode of the first aspect, the method comprising the steps of:
preparing coating slurry from coating preparation raw materials, and coating the coating slurry on a base film to form a coating, thereby obtaining the membrane electrode.
Preferably, the solvent comprises ethanol and/or isopropanol.
Preferably, the additive comprises any one of or a combination of at least two of alcohol compounds containing at least one hydroxyl group.
Preferably, the additive comprises glycerol.
Preferably, the coating process further comprises the operation of pretreating the base film.
Preferably, the pre-treatment comprises any one or a combination of at least two of solvent cleaning, corona or mechanical abrasion.
Preferably, the coating comprises slot extrusion coating.
As a preferred technical scheme, the preparation method comprises the following steps:
(1) mixing a catalyst, perfluorinated sulfonic acid resin, a solvent and an additive according to weight percentage to obtain coating slurry, and then pretreating a base film;
(2) and coating the coating slurry on the pretreated base film, and drying to form a coating, thereby obtaining the membrane electrode.
In a third aspect, the present invention provides a fuel cell characterized by comprising the membrane electrode of the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
the membrane electrode has simple process, can solve the problems of claw shape, cracking and deformation, and improves the performance of the battery. The internal resistance of the membrane electrode of the invention is 79m omega/cm2The power density is 0.7W/cm2Above, in the polarization curve test, at 0.65V, the polarization current density is 1.08A/cm2The above; when the surface tension of the base film is in the range of 35-70mN/m and the surface tension of the coating slurry is in the range of 7-25mN/m, the internal cell resistance of the membrane electrode is 62m omega/cm2The power density is 0.91W/cm2Above, in the polarization curve test, at 0.65V, the polarization current density is 1.40A/cm2The above.
Drawings
FIG. 1 is an electron microscope photograph of a membrane electrode according to example 1;
fig. 2 is an electron microscope photograph of the membrane electrode described in comparative example 1.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The present embodiment provides a membrane electrode comprising a base membrane (having a thickness of 11 μm) and a coating layer (having a thickness of 8 μm) provided on one side or both sides of the base membrane;
the base membrane comprises a proton exchange membrane, namely a perfluorinated sulfonic acid proton exchange membrane.
The coating is obtained from coating slurry, and the coating slurry comprises the following components in percentage by weight based on 100% of the total mass of the coating slurry: 15 percent of catalyst (40 percent of Pt/C), 10 percent of perfluorinated sulfonic acid resin (the solid content is 20 percent of perfluorinated sulfonic acid resin solution), 78 percent of solvent (ethanol and isopropanol with the mass ratio of 1: 1) and 2 percent of additive (glycerol);
the surface tension of the coating slurry is 10mN/m, the dynamic viscosity is 500mPa & s, and the solid content is 18%;
the surface tension of the base film was 50mN/m, and the difference was 40 mN/m.
The preparation method of the membrane electrode comprises the following steps:
preparing coating slurry from coating preparation raw materials, and coating the coating slurry on a base film to obtain the membrane electrode.
(1) Mixing a catalyst, perfluorinated sulfonic acid resin, a solvent and an additive according to weight percentage to obtain coating slurry, and then pretreating (mechanically polishing) a base film until the surface tension is 50 mN/m;
(2) and extruding and coating the coating slurry on the pretreated base film through a slit, and drying to form a coating to obtain the membrane electrode.
Example 2
The present embodiment provides a membrane electrode comprising a base membrane (having a thickness of 10 μm) and a coating layer (having a thickness of 5 μm) provided on one side or both sides of the base membrane;
the base film comprises graphite paper.
The coating is obtained from coating slurry, and the coating slurry comprises the following components in percentage by weight based on 100% of the total mass of the coating slurry: 15 percent of catalyst (20 percent Pt/C), 2 percent of perfluorinated sulfonic acid resin (the solid content is 20 percent of perfluorinated sulfonic acid resin solution), 82 percent of solvent (ethanol) and 1 percent of additive (glycerol);
the surface tension of the coating slurry is 7mN/m, the dynamic viscosity is 80mPa & s, and the solid content is 15%;
the surface tension of the base film was 35mN/m, and the difference was 28 mN/m.
The preparation method of the membrane electrode comprises the following steps:
preparing coating slurry from coating preparation raw materials, and coating the coating slurry on a base film to obtain the membrane electrode.
(1) Mixing a catalyst, perfluorinated sulfonic acid resin, a solvent and an additive according to weight percentage to obtain coating slurry, and then carrying out pretreatment (corona) on a base film until the surface tension is 35 mN/m;
(2) and extruding and coating the coating slurry on the pretreated base film through a slit, and drying to obtain the membrane electrode.
Example 3
The present embodiment provides a membrane electrode comprising a base membrane (having a thickness of 12 μm) and a coating layer (having a thickness of 10 μm) provided on one side or both sides of the base membrane;
the base film comprises graphite paper arranged in a lamination mode and/or a polyester film with an adhesive coating arranged on the surface.
The coating is obtained from coating slurry, and the coating slurry comprises the following components in percentage by weight based on 100% of the total mass of the coating slurry: 8% of catalyst (60% of Pt/C and PtCo/C with the mass ratio of 1: 1), 18% of perfluorinated sulfonic acid resin (with the solid content of 20% of perfluorinated sulfonic acid resin solution), 67% of solvent (isopropanol) and 5% of additive (glycerol);
the surface tension of the coating slurry is 25mN/m, the dynamic viscosity is 900mPa & s, and the solid content is 25%;
the surface tension of the base film was 70mN/m, and the difference was 35 mN/m.
The preparation method of the membrane electrode comprises the following steps:
preparing coating slurry from coating preparation raw materials, and coating the coating slurry on a base film to obtain the membrane electrode.
(1) Mixing a catalyst, perfluorinated sulfonic acid resin, a solvent and an additive according to weight percentage to obtain coating slurry, and then pretreating (cleaning) a base film by using the solvent until the surface tension is 70 mN/m;
(2) and extruding and coating the coating slurry on the pretreated base film through a slit, and drying to obtain the membrane electrode.
Examples 4 to 7
Examples 4-7 differ from example 1 in the surface tension of the base film, specifically:
example 4, the surface tension of the base film was 35mN/m, the coating slurry was unchanged, and the rest was the same as example 1;
example 5, the surface tension of the base film was 70mN/m, the coating slurry was unchanged, and the rest was the same as example 1;
example 6, the surface tension of the base film was 30mN/m, the coating slurry was unchanged, and the rest was the same as example 1;
example 7 the surface tension of the base film was 80mN/m, the coating slurry was not changed, and the rest was the same as example 1.
Examples 8 to 11
Examples 8-11 differ from example 1 in the surface tension of the coating slurry, specifically:
example 8, the surface tension of the coating slurry was 7mN/m (in the coating slurry, the amount of the additive was adjusted without changing the amount of the other components except the additive), the base film was unchanged, and the rest was the same as in example 1;
example 9, the surface tension of the coating slurry was 25mN/m (in the coating slurry, the amount of the additive was adjusted without changing the amount of the other components except the additive), and the base film was the same as in example 1 without changing the base film;
example 10, the surface tension of the coating slurry was 5mN/m (in the coating slurry, the amount of the additive was adjusted without changing the amount of the other components except the additive), the base film was unchanged, and the rest was the same as in example 1;
example 11 the surface tension of the coating slurry was 30mN/m (in the coating slurry, the amounts of the components other than the additives were not changed, and the additive amounts were adjusted), and the base film was not changed, and the same as in example 1 was performed.
Comparative example 1
The comparative example is different from example 1 in that the difference in surface tension between the base film and the coating slurry is 5mN/m, the surface tension of the base film is 30mN/m, and the surface tension of the coating slurry is 25mN/m (in the coating slurry, the amounts of the components other than the additives are not changed, and the amounts of the additives are adjusted), and the rest is the same as example 1.
Performance testing
The membrane electrodes described in examples 1 to 11 and comparative example 1 were tested as follows:
(1) surface morphology: carrying out electron microscope test and observing with naked eyes;
wherein, the performance is best without cracking, claw lines and bottom exposure, and the performance is set as I grade, and II grade and III grade are set in sequence according to the performance reduction degree.
And assembling the membrane electrode into a fuel cell, assembling an end plate, a current collecting plate, a flow field plate and an MEA according to the position of a cell clamp positioning hole in the membrane electrode testing method standard GB-T/20042.5-2009 in sequence, testing the internal resistance of the cell and the polarization curve of a single cell, and counting the polarization current density when the polarization potential is 0.65V.
The test results are summarized in Table 1 and FIGS. 1-2.
TABLE 1
Analysis ofThe data in table 1 show that the membrane electrode of the present invention has the appearance of no crack, no claw line, no bottom exposure or slight crack, and the formed fuel cell has excellent electrical property, low cell internal resistance, large current density at 0.65V and excellent power density. The internal resistance of the membrane electrode of the invention is 79m omega/cm2The power density is 0.7W/cm2Above, in the polarization curve test, at 0.65V, the polarization current density is 1.08A/cm2The above; when the surface tension of the base film is in the range of 35-70mN/m and the surface tension of the coating slurry is in the range of 7-25mN/m, the internal cell resistance of the membrane electrode is 62m omega/cm2The power density is 0.91W/cm2Above, in the polarization curve test, at 0.65V, the polarization current density is 1.40A/cm2The above.
As can be seen from the analysis of the performances of comparative example 1 and example 1, the performance of comparative example 1 is inferior to that of example 1, the coating appearance is poor and the cell power density is low, the difference between the coating slurry and the base film tension is less than or equal to 5mN/m, and the performance of the membrane electrode obtained by controlling the surface tension between the base film and the coating slurry to be more than 5mN/m is proved to be better.
As is clear from the analysis of examples 4 to 7, examples 6 to 7 were inferior in performance to examples 4 to 5, and it was confirmed that the performance of the resulting membrane electrode was better with the surface tension of the base film in the range of 35 to 70 mN/m.
As can be seen from the analysis of examples 8 to 11, examples 10 to 11 were inferior in performance to examples 8 to 9, and it was confirmed that the performance of the resulting membrane electrode was better with the surface tension of the coating slurry in the range of 7 to 25 mN/m.
As can be seen from the analysis of fig. 1 and 2, compared with the membrane electrode shown in fig. 2, the membrane electrode shown in fig. 1 has a smoother surface and a weaker granular feeling, and the performance of the membrane electrode obtained by regulating the surface tension difference between the base membrane and the coating slurry to be more than 5mN/m is better.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A membrane electrode, wherein the membrane electrode comprises a base membrane and a coating layer disposed on one or both sides of the base membrane;
the coating layer is formed from a coating slurry;
the difference of the surface tension of the base film and the coating slurry is more than 5mN/m, and the surface tension of the base film is more than that of the coating slurry.
2. The membrane electrode of claim 1, wherein the surface tension of the base membrane is 35-70 mN/m;
preferably, the surface tension of the coating slurry is 7 to 25 mN/m.
3. A membrane electrode according to claim 1 or 2, characterised in that the thickness of the coating is 5-25 μ ι η;
preferably, the thickness of the base film is 7 to 15 μm.
4. A membrane electrode assembly according to any one of claims 1 to 3, wherein the base membrane comprises any one of or a combination of at least two of a proton exchange membrane, a graphite paper or a polyester film provided with an adhesive coating on its surface;
preferably, the coating slurry comprises the following components in percentage by weight based on 100% of the total mass of the coating slurry: 5-25% of catalyst, 2-18% of perfluorinated sulfonic acid resin, 60-85% of solvent and 1-5% of additive;
preferably, the coating slurry has a dynamic viscosity of 80 to 900 mPa-s;
preferably, the coating slurry has a solids content of 15% to 25%.
5. A method of preparing a membrane electrode according to any one of claims 1 to 4, comprising the steps of:
preparing coating slurry from coating preparation raw materials, and coating the coating slurry on a base film to form a coating, thereby obtaining the membrane electrode.
6. The production method according to claim 5, wherein the solvent comprises ethanol and/or isopropanol;
preferably, the additive comprises any one or a combination of at least two of alcohol compounds containing at least one hydroxyl group;
preferably, the additive comprises glycerol.
7. The method according to claim 5 or 6, characterized in that the coating step further comprises a step of pretreating the base film;
preferably, the pre-treatment comprises any one or a combination of at least two of solvent cleaning, corona or mechanical abrasion.
8. The method of any one of claims 5-7, wherein the coating comprises slot extrusion coating.
9. The method according to any one of claims 5 to 8, characterized by comprising the steps of:
(1) mixing a catalyst, perfluorinated sulfonic acid resin, a solvent and an additive according to weight percentage to obtain coating slurry, and then pretreating a base film;
(2) and coating the coating slurry on the pretreated base film, and drying to form a coating, thereby obtaining the membrane electrode.
10. A fuel cell comprising the membrane electrode according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110924554.0A CN113659157A (en) | 2021-08-12 | 2021-08-12 | Membrane electrode and preparation method and application thereof |
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