CN117013024A - Membrane electrode for high-temperature proton exchange membrane fuel cell and preparation method thereof - Google Patents
Membrane electrode for high-temperature proton exchange membrane fuel cell and preparation method thereof Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title abstract description 8
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000004693 Polybenzimidazole Substances 0.000 claims abstract description 32
- 229920002480 polybenzimidazole Polymers 0.000 claims abstract description 32
- 229920000554 ionomer Polymers 0.000 claims abstract description 28
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 19
- 230000003197 catalytic effect Effects 0.000 claims abstract description 19
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- 239000011865 Pt-based catalyst Substances 0.000 claims description 6
- 230000002209 hydrophobic effect Effects 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 2
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- 230000010287 polarization Effects 0.000 description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
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- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
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Classifications
-
- 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]
-
- 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 discloses a membrane electrode for a high-temperature proton exchange membrane fuel cell and a preparation method thereof, wherein the membrane electrode is provided with an ionomer layer, and is of a multi-layer structure sequentially composed of a conductive substrate, a catalytic layer, an ionomer layer, a high-temperature proton exchange membrane, an ionomer layer, a catalytic layer and a conductive substrate, wherein the ionomer layer takes one or more polymers in polybenzimidazole or derivatives thereof as a main component, and is doped with carbon powder or one or more conductive agents in derivatives thereof to form a composite material, and the ionomer layer is formed on the surface of the catalytic layer. The membrane electrode in the invention constructs more three-phase interface sites by controlling electrolyte distribution represented by phosphoric acid through introducing the structure of the ionomer layer, has high peak power density and high current density, has simple preparation process and low cost, is applied to membrane electrodes of various high-temperature proton exchange membrane fuel cells, and has large-scale production application potential.
Description
Technical Field
The invention belongs to the field of electrode materials, and particularly relates to a membrane electrode for a high-temperature proton exchange membrane fuel cell and a preparation method thereof.
Background
The high-temperature proton exchange membrane fuel cell which works at 120-200 ℃ can perform oxidation-reduction reaction in the membrane cell by using hydrogen, methanol, ethanol, hydrocarbon and other compounds as fuel, and can effectively convert chemical energy of the fuel into electric energy and heat energy. Compared with a low-temperature proton exchange membrane fuel cell, the fuel cell has higher tolerance to impurity fuels such as CO, quicker reaction kinetics and simpler water management system, so that the integrated system is easy to realize, and further the large-scale application is promoted, and the fuel cell has great advantages and application prospects as a power generation device.
Although high temperature proton exchange membrane fuel cells have good prospects, the technology still has the drawbacks to be solved, such as lower power density, lower battery life, etc. Because of the high temperature proton exchange membrane fuel cell, the conductivity of the proton membrane is not derived from water, but from phosphoric acid. Therefore, before the battery is assembled, the high-temperature proton exchange membrane is generally subjected to phosphoric acid soaking treatment so as to have certain conductivity. However, during assembly and long-term operation, phosphoric acid is lost in large amounts, resulting in catalyst poisoning and a decrease in conductivity of the high temperature proton exchange membrane, which in turn results in a decrease in power density. Document (International Journal of Hydrogen Energy,2020,45,1008-1017) reports a high temperature proton exchange membrane with a three-layer polybenzimidazole structure for controlling the electrolyte distribution of a high temperature proton exchange membrane fuel cell, after activation at 0.2A cm -2 The current-loaded single cell was maintained at 0.65V after testing, with a peak power of 359mW cm -2 . Literature (Nano Energy,2021,93,106829) reports a membrane electrode structure with single layer graphene for controlling electrolyte distribution of high temperature proton exchange membrane fuel cells, after activation at 0.49A cm -2 The current-loaded single cell was maintained at 0.60V after testing, with a peak power of 470mW cm -2 . Chinese patent (publication No. CN 105742649B) discloses a high-temperature proton exchange membraneThe membrane electrode of the fuel cell and the preparation method thereof are characterized in that the gas diffusion electrode is subjected to acid treatment in advance before the membrane electrode is pressed and assembled, so that the distribution of electrolyte is better controlled. Under this method, the current density at 0.6V was 0.3A cm -2 Peak power of 302mW cm -2 。
In summary, the current literature reports and the published patents that membrane electrodes for high temperature fuel cells control electrolyte distribution mainly through structural design, but still have lower current density and peak power density, which need to be further improved.
Disclosure of Invention
The main object of the present invention is to provide a membrane electrode for a high temperature proton exchange membrane fuel cell, adding an ionomer layer between the catalytic layer and the high temperature proton exchange membrane.
Another object of the present invention is to provide a method for preparing the membrane electrode for a high temperature proton exchange membrane fuel cell.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a membrane electrode for a high-temperature proton exchange membrane fuel cell, which is a multi-layer structure sequentially composed of a conductive substrate, a catalytic layer, an ionomer layer, a high-temperature proton exchange membrane, the ionomer layer, the catalytic layer and the conductive substrate, wherein the ionomer layer takes one or more polymers in polybenzimidazole or derivatives thereof as main components, is doped with carbon powder or one or more conductive agents in derivatives thereof to form a composite material, and the ionomer layer is formed on the surface of the catalytic layer.
Preferably, the ionomer layer has a loading of 0.1 to 0.5mg cm of polybenzimidazole or one or more polymers of its derivatives -2 。
Preferably, the conductive substrate is carbon paper or carbon cloth with a gas diffusion layer and/or a microporous layer.
Preferably, the catalytic layer is a composite material formed by a Pt-based catalyst formed by a deposition process and a hydrophobic binder, wherein the mass ratio of the hydrophobic binder to the Pt-based catalyst is 1:5-20, wherein the hydrophobic binder is selected from polytetrafluoroethylene and/or polyvinylidene fluoride.
Preferably, the high temperature proton exchange membrane is one or more polymers of acid treated polybenzimidazole or derivatives thereof.
The invention also provides a preparation method of the membrane electrode for the high-temperature proton exchange membrane fuel cell, which comprises the following steps:
(1) Taking one or more of water, ethanol or isopropanol as a dispersing agent, adding Pt-based catalyst powder as an active ingredient and a suspension of polytetrafluoroethylene and/or polyvinylidene fluoride as a binder, and performing ultrasonic treatment on the obtained mixed slurry for 5-120min to obtain catalyst slurry;
(2) The catalyst sizing agent obtained in the step (1) is coated on the conductive substrate by adopting air spraying, electrostatic spraying, ultrasonic spraying, knife coating, screen printing or rolling method, and is dried for 0.5 to 4 hours at the temperature of 60 to 80 ℃ to obtain the conductive substrate with the catalytic layer;
(3) Placing the conductive substrate with the catalytic layer obtained in the step (2) at 200-400 ℃ for sintering for 1-5h and taking out to obtain a gas diffusion electrode;
(4) Taking one or more of dimethylformamide, dimethylacetamide, dimethyl sulfoxide and N-methyl-2-pyrrolidone as a dispersing agent, adding one or more polymers in polybenzimidazole or derivatives thereof, wherein the mass ratio of solid to liquid is 1: heating the mixed solution at 100-250 ℃ until the polymer is completely dissolved to obtain an organic solution, wherein the mixed solution is 20-500;
(5) Coating the organic solution obtained in the step (4) on the surface of the catalytic layer by adopting air spraying, electrostatic spraying, ultrasonic spraying, a knife coating method, a screen printing method or a rolling method, and drying for 0.5-3h at 80-160 ℃ to obtain an ionomer layer;
(6) Immersing one or more polymer films in polybenzimidazole or derivatives thereof with the thickness of 10-35 microns in a mixture of one or more of phosphoric acid, hydrochloric acid or sulfuric acid in any proportion for 0.5-10h at the temperature of 80-120 ℃ to obtain a high-temperature proton exchange membrane;
(7) And placing the gas diffusion electrode, the high-temperature proton exchange membrane and the gas diffusion electrode in sequence to form a sandwich structure, and hot-pressing for 1-8min at 100-150 ℃ and under the condition of 0.1-0.4MPa to obtain the membrane electrode.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a membrane electrode for a high-temperature proton exchange membrane fuel cell, which is provided with an ionomer layer, has obvious advantages of high peak power density and high current density compared with the existing similar products, has simple preparation process and low cost, can be applied to membrane electrodes of various high-temperature proton exchange membrane fuel cells, and has large-scale production and application potential.
2. The basic material of the ionomer layer is basically similar or identical to the high-temperature proton exchange membrane material, no new material is needed to be introduced, and the cost is low.
3. Aiming at the problems of lower current density and power density of the membrane electrode of the prior high-temperature proton exchange membrane fuel cell, the structure of the ionomer layer is introduced to control electrolyte distribution represented by phosphoric acid, so as to construct more three-phase interface sites, prevent poisoning caused by excessive invasion of electrolyte such as phosphoric acid into the catalytic layer, and maintain the content of the electrolyte such as phosphoric acid in the high-temperature proton exchange membrane, thereby improving the power density and current density of a single cell of the high-temperature proton exchange membrane fuel cell.
Drawings
Fig. 1 is a polarization curve and a power density curve of the membrane electrode as a single cell obtained in examples 1, 2 and 3.
Fig. 2 is a polarization curve and a power density curve of the membrane electrode obtained in examples 4 and 5 as a single cell.
Fig. 3 is a schematic structural diagram of a membrane electrode for a high temperature proton exchange membrane fuel cell according to the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1
The embodiment provides a membrane electrode for a high-temperature proton exchange membrane fuel cell, which is prepared by the following steps:
1)0.85mg pt /cm 2 Pt/C and 20wt.% polytetrafluoroethylene were mixed and ultrasonically dispersed for 90min to obtain a mixed slurry.
2) The mixed slurry is sprayed on carbon paper by ultrasonic, dried for 1h at 60 ℃, and sintered for 2h at 350 ℃.
3) Polybenzimidazole/dimethyl sulfoxide solution at 1:200 mass ratio, heating and dissolving at 180 ℃ to obtain organic solution
4) Uniformly spraying an organic solution on the sintered carbon paper, wherein the load of polybenzimidazole is 0.15mg/cm 2 Drying at 120℃for 1h.
5) A polybenzimidazole film with the thickness of 25 microns is soaked in phosphoric acid for 3 hours at the temperature of 120 ℃ and then the redundant phosphoric acid is wiped.
6) And (3) carrying out press fitting on the carbon paper obtained in the step (4) and the polybenzimidazole film obtained in the step (5) to obtain the membrane electrode.
In the cell test, 0.3L min was supplied -1 Hydrogen and 0.5L min -1 Air was provided to a back pressure of 2Bar at a test temperature of 180℃and the Carbon paper used was 39BB type Carbon paper manufactured by SGL Carbon company. Fig. 1 shows the polarization curve and the power density curve of the membrane electrode as a single cell prepared in this example. As can be seen from FIG. 1, the membrane electrode with ionomer layer for high temperature proton exchange membrane fuel cell has a peak power density of 638mW cm -2 The current density at 0.6V was 502mA cm -2 。
Example 2
The embodiment provides a membrane electrode for a high-temperature proton exchange membrane fuel cell, which is prepared by the following steps:
1)0.85mg pt /cm 2 Pt/C and 20wt.% polytetrafluoroethylene were mixed and ultrasonically dispersed for 90min to obtain a mixed slurry.
2) The mixed slurry is sprayed on carbon paper by ultrasonic, dried for 1h at 60 ℃, and sintered for 2h at 350 ℃.
3) Polybenzimidazole/dimethyl sulfoxide solution at 1:200 mass ratio, heating and dissolving at 180 ℃ to obtain organic solution
4) Uniformly spraying an organic solution on the sintered carbon paper, wherein the load of polybenzimidazole is 0.3mg/cm 2 Drying at 120℃for 1h.
5) A polybenzimidazole film with the thickness of 25 microns is soaked in phosphoric acid for 3 hours at the temperature of 120 ℃ and then the redundant phosphoric acid is wiped.
6) And (3) carrying out press fitting on the carbon paper obtained in the step (4) and the polybenzimidazole film obtained in the step (5) to obtain the membrane electrode.
In the cell test, 0.3L min was supplied -1 Hydrogen and 0.5L min -1 Air was provided to a back pressure of 2Bar at a test temperature of 180℃and the Carbon paper used was 39BB type Carbon paper manufactured by SGL Carbon company. Fig. 1 shows the polarization curve and the power density curve of the membrane electrode as a single cell prepared in this example. As can be seen from FIG. 1, the membrane electrode with ionomer layer for high temperature proton exchange membrane fuel cell has a peak power density of 702mW cm -2 The current density at 0.6V was 401mA cm -2 。
Example 3
The embodiment provides a membrane electrode for a high-temperature proton exchange membrane fuel cell, which is prepared by the following steps:
1)0.85mg pt /cm 2 Pt/C and 20wt.% polytetrafluoroethylene were mixed and ultrasonically dispersed for 90min to obtain a mixed slurry.
2) The mixed slurry is sprayed on carbon paper by ultrasonic, dried for 1h at 60 ℃, and sintered for 2h at 350 ℃.
3) Polybenzimidazole/dimethyl sulfoxide solution at 1:200 mass ratio, heating and dissolving at 180 ℃ to obtain organic solution
4) Uniformly spraying an organic solution on the sintered carbon paper, wherein the load of polybenzimidazole is 0.45mg/cm 2 Drying at 120℃for 1h.
5) A polybenzimidazole film with the thickness of 25 microns is soaked in phosphoric acid for 3 hours at the temperature of 120 ℃ and then the redundant phosphoric acid is wiped.
6) And (3) carrying out press fitting on the carbon paper obtained in the step (4) and the polybenzimidazole film obtained in the step (5) to obtain the membrane electrode.
In the cell test, 0.3L min was supplied -1 Hydrogen and 0.5L min -1 Air was provided to a back pressure of 2Bar at a test temperature of 180℃and the Carbon paper used was 39BB type Carbon paper manufactured by SGL Carbon company. Fig. 1 shows the polarization curve and the power density curve of the membrane electrode as a single cell prepared in this example. As can be seen from FIG. 1, the membrane electrode with ionomer layer for high temperature proton exchange membrane fuel cell has a peak power density of 626mW cm -2 The current density at 0.6V was 390mA cm -2 。
Example 4
The embodiment provides a membrane electrode for a high-temperature proton exchange membrane fuel cell, which is prepared by the following steps:
1)0.85mg pt /cm 2 Pt/C and 20wt.% polytetrafluoroethylene were mixed and ultrasonically dispersed for 90min to obtain a mixed slurry.
2) The mixed slurry is sprayed on carbon paper by ultrasonic, dried for 1h at 60 ℃, and sintered for 2h at 350 ℃.
3) Polybenzimidazole/dimethyl sulfoxide solution at 1:200 mass ratio, heating and dissolving at 180 ℃ to obtain organic solution
4) Uniformly spraying an organic solution on the sintered carbon paper, wherein the load of polybenzimidazole is 0.3mg/cm 2 Drying at 120℃for 1h.
5) And immersing a polybenzimidazole film with the thickness of 20 micrometers in phosphoric acid at 120 ℃ for 3 hours, and then wiping the redundant phosphoric acid.
6) And (3) carrying out press fitting on the carbon paper obtained in the step (4) and the polybenzimidazole film obtained in the step (5) to obtain the membrane electrode.
Feeding for 0.3L min -1 Hydrogen and 0.5L min -1 Air was provided to a back pressure of 2Bar at a test temperature of 180℃and the Carbon paper used was 39BB type Carbon paper manufactured by SGL Carbon company. Fig. 2 shows the polarization curve and the power density curve of the membrane electrode as a single cell prepared in this example. As can be seen from fig. 2, a membrane electrode with ionomer layer for a high temperature proton exchange membrane fuel cellPeak power density of 713mW cm -2 The current density at 0.6V was 475mA cm -2 。
Example 5
The embodiment provides a membrane electrode for a high-temperature proton exchange membrane fuel cell, which is prepared by the following steps:
1)0.85mg pt /cm 2 Pt/C and 20wt.% polytetrafluoroethylene were mixed and ultrasonically dispersed for 90min to obtain a mixed slurry.
2) The mixed slurry is sprayed on carbon paper by ultrasonic, dried for 1h at 60 ℃, and sintered for 2h at 350 ℃.
3) Polybenzimidazole/dimethyl sulfoxide solution at 1:200 mass ratio, heating and dissolving at 180 ℃ to obtain organic solution
4) Uniformly spraying an organic solution on the sintered carbon paper, wherein the load of polybenzimidazole is 0.3mg/cm 2 Drying at 120℃for 1h.
5) And immersing a polybenzimidazole film with the thickness of 15 microns in phosphoric acid at 120 ℃ for 3 hours, and then wiping the redundant phosphoric acid.
6) And (3) carrying out press fitting on the carbon paper obtained in the step (4) and the polybenzimidazole film obtained in the step (5) to obtain the membrane electrode.
In the cell test, 0.3L min was supplied -1 Hydrogen and 0.5L min -1 Air was provided to a back pressure of 2Bar at a test temperature of 180℃and the Carbon paper used was 39BB type Carbon paper manufactured by SGL Carbon company. Fig. 2 shows the polarization curve and the power density curve of the membrane electrode as a single cell prepared in this example. As can be seen from FIG. 2, the membrane electrode with ionomer layer for high temperature proton exchange membrane fuel cell has a peak power density of 721mW cm -2 The current density at 0.6V was 460mA cm -2 。
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make or use the present invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments and that the general principles described herein may be applied to other embodiments without the need for inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (7)
1. A membrane electrode for a high temperature proton exchange membrane fuel cell, characterized in that the membrane electrode has an ionomer layer, which is a multi-layer structure composed of a conductive substrate, a catalytic layer, an ionomer layer, a high temperature proton exchange membrane, an ionomer layer, a catalytic layer, and a conductive substrate in this order, wherein the ionomer layer uses one or more polymers of polybenzimidazole or derivatives thereof as a main component, is doped with one or more conductive agents of carbon powder or derivatives thereof to form a composite material, and the ionomer layer is formed on the surface of the catalytic layer.
2. The membrane electrode for a high temperature proton exchange membrane fuel cell as claimed in claim 1, wherein the ionomer layer has a loading of 0.1 to 0.5mg cm of one or more polymers of polybenzimidazole or derivatives thereof -2 。
3. The membrane electrode for a high temperature proton exchange membrane fuel cell as claimed in claim 1, wherein the conductive substrate is carbon paper or carbon cloth having a gas diffusion layer and/or a microporous layer.
4. The membrane electrode for a high temperature proton exchange membrane fuel cell as claimed in claim 1, wherein the catalytic layer is a composite material formed by a Pt-based catalyst formed by a deposition process and a hydrophobic binder, wherein a mass ratio of the hydrophobic binder to the Pt-based catalyst is 1:5-20, wherein the hydrophobic binder is selected from polytetrafluoroethylene and/or polyvinylidene fluoride.
5. The membrane electrode for a high temperature proton exchange membrane fuel cell as claimed in claim 1, wherein the high temperature proton exchange membrane is one or more polymers of acid treated polybenzimidazole or derivatives thereof.
6. A method for producing a membrane electrode for a high temperature proton exchange membrane fuel cell as claimed in any one of claims 1 to 5, comprising the steps of:
(1) Taking one or more of water, ethanol or isopropanol as a dispersing agent, adding Pt-based catalyst powder as an active ingredient and a suspension of polytetrafluoroethylene and/or polyvinylidene fluoride as a binder, and performing ultrasonic treatment on the obtained mixed slurry for 5-120min to obtain catalyst slurry;
(2) The catalyst sizing agent obtained in the step (1) is coated on the conductive substrate by adopting air spraying, electrostatic spraying, ultrasonic spraying, knife coating, screen printing or rolling method, and is dried for 0.5 to 4 hours at the temperature of 60 to 80 ℃ to obtain the conductive substrate with the catalytic layer;
(3) Placing the conductive substrate with the catalytic layer obtained in the step (2) at 200-400 ℃ for sintering for 1-5h and taking out to obtain a gas diffusion electrode;
(4) Taking one or more of dimethylformamide, dimethylacetamide, dimethyl sulfoxide and N-methyl-2-pyrrolidone as a dispersing agent, adding one or more polymers in polybenzimidazole or derivatives thereof, wherein the mass ratio of solid to liquid is 1: heating the mixed solution at 100-250 ℃ until the polymer is completely dissolved to obtain an organic solution, wherein the mixed solution is 20-500;
(5) Coating the organic solution obtained in the step (4) on the surface of the catalytic layer by adopting air spraying, electrostatic spraying, ultrasonic spraying, a knife coating method, a screen printing method or a rolling method, and drying for 0.5-3h at 80-160 ℃ to obtain an ionomer layer;
(6) Immersing one or more polymer films in polybenzimidazole or derivatives thereof with the thickness of 10-35 microns in a mixture of one or more of phosphoric acid, hydrochloric acid or sulfuric acid in any proportion for 0.5-10h at the temperature of 80-120 ℃ to obtain a high-temperature proton exchange membrane;
(7) And placing the gas diffusion electrode, the high-temperature proton exchange membrane and the gas diffusion electrode in sequence to form a sandwich structure, and hot-pressing for 1-8min at 100-150 ℃ and under the condition of 0.1-0.4MPa to obtain the membrane electrode.
7. Use of a membrane electrode for a high temperature proton exchange membrane fuel cell according to any one of claims 1 to 5 in a high temperature proton exchange membrane fuel cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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