WO2002058178A1 - Procede de fabrication d'une liaison film electrolytique-electrode de pile a combustible - Google Patents
Procede de fabrication d'une liaison film electrolytique-electrode de pile a combustible Download PDFInfo
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- WO2002058178A1 WO2002058178A1 PCT/JP2002/000257 JP0200257W WO02058178A1 WO 2002058178 A1 WO2002058178 A1 WO 2002058178A1 JP 0200257 W JP0200257 W JP 0200257W WO 02058178 A1 WO02058178 A1 WO 02058178A1
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- electrolyte membrane
- polymer electrolyte
- support
- catalyst layer
- layer
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/8605—Porous electrodes
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- 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
- H01M4/8652—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites as mixture
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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
- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
- H01M4/925—Metals of platinum group supported on carriers, e.g. powder carriers
- H01M4/926—Metals of platinum group supported on carriers, e.g. powder carriers on carbon or graphite
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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
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
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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
- 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]
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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
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
- H01M8/1018—Polymeric electrolyte materials
- H01M8/102—Polymeric electrolyte materials characterised by the chemical structure of the main chain of the ion-conducting polymer
- H01M8/1023—Polymeric electrolyte materials characterised by the chemical structure of the main chain of the ion-conducting polymer having only carbon, e.g. polyarylenes, polystyrenes or polybutadiene-styrenes
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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
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
- H01M8/1018—Polymeric electrolyte materials
- H01M8/1039—Polymeric electrolyte materials halogenated, e.g. sulfonated polyvinylidene fluorides
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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
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
- H01M8/1018—Polymeric electrolyte materials
- H01M8/1069—Polymeric electrolyte materials characterised by the manufacturing processes
- H01M8/1081—Polymeric electrolyte materials characterised by the manufacturing processes starting from solutions, dispersions or slurries exclusively of polymers
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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
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M2008/1095—Fuel cells with polymeric electrolytes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a method for producing an electrolyte membrane-electrode assembly used for a polymer electrolyte fuel cell.
- An electrolyte membrane-electrode assembly used in a polymer electrolyte fuel cell is composed of a film-like hydrogen ion conductive polymer electrolyte membrane serving as an electrolyte, a first gas diffusion electrode serving as an anode, and a It is obtained by joining a second gas diffusion electrode serving as a cathode.
- the gas diffusion electrode is composed of a gas diffusion layer and a catalyst layer, and the gas diffusion layer is made of porous carbon paper or the like.
- the catalyst layer of the anode and the force sword is composed of fine particles of noble metal and force particles carrying these.
- the electrolyte membrane-electrode assembly for PEFC joins gas diffusion electrodes 146 and 147 to a film-like polymer electrolyte membrane 141, which is an electrolyte. Obtained by:
- the polymer electrolyte membrane 141 is usually supplied by a roll.
- FIG. 10 (a) shows an example of a method for producing an electrolyte membrane-electrode assembly.
- carbon paper (gas diffusion layer) 144 and 1 on which catalyst layers 144 and 145 are formed are shown. 44 is pressed against the polymer electrolyte membrane 141 by hot pressing.
- a catalyst layer is previously formed on a polymer electrolyte membrane by transfer or printing, and then carbon paper is pressed. Then, in the catalyst layer 144 on the anode side, the equation (1):
- Such a PEFC is required to output a high output voltage, but for that purpose, the polymer electrolyte membrane used must have high proton conductivity, that is, have a low internal resistance. You. In order to obtain high proton conductivity, it is necessary to use a material having high proton conductivity for the polymer electrolyte membrane, or to use a membrane as thin as possible.
- a polymer electrolyte membrane made of perfluorosulfonic acid ionomer represented by Nafion 112 manufactured by DuPont of the U.S.A. is used as the polymer electrolyte of PEFC, and is about 30 to 50 xm. Films having a thickness have been put to practical use.
- a polymer electrolyte membrane composed of a perfluoro-mouth sulfonic acid ionomer having a proton conductivity higher than that of Nafion for example, an F1 emion SH membrane manufactured by Asahi Glass Co., Ltd. may be mentioned, which contains a sulfonic acid group. Therefore, there is a problem that it is more brittle than Nafionll 2 and is easily broken. Therefore, commercially available films have a thickness of about 50 zm or more.
- Japanese Patent Application Laid-Open No. 08-162132 discloses that a porous polytetrafluoroethylene cloth is used as a core material
- a method is disclosed in which a polymer electrolyte membrane is impregnated with a polymer electrolyte resin to form a strong polymer electrolyte membrane.
- Specific products manufactured by this method include, for example, GORE-SELECT membrane manufactured by Japan Gore-Tex Co., Ltd. This film has been put into practical use to a thickness of about 20 to 30 / zm by using a reinforcing agent.
- an electrolyte membrane-electrode assembly there is a method of printing or spraying an ink-like or paste-like catalyst-electrolyte mixture containing a catalyst on the surface of an electrolyte membrane or a gas diffusion layer. There is. In either method, after the above mixture is applied, the electrolyte membrane and the gas diffusion electrode are joined by hot pressing or the like (see, for example, Japanese Patent Application Laid-Open Nos. Hei 6-20949 and Hei 8-8). No. 811 and Japanese Patent Application Laid-Open No. Hei 8-106169).
- the conventional manufacturing method includes a step of handling the electrolyte membrane without using a support for the electrolyte membrane. Therefore, for example, when an electrolyte membrane having a thickness less than 20 im and inferior strength is used, it is extremely difficult to manufacture an electrolyte membrane-electrode assembly without breaking the electrolyte membrane.
- polymer electrolytes such as perfluorosulfonic acid ionomers, which have high proton conductivity, contain many hydrophilic groups, such as sulfonic acid groups, in their molecular chains. Then, it tends to gradually flow out to a gas diffusion layer such as carbon paper. Therefore, at the interface between the polymer electrolyte membrane and the electrode, the pores serving as the supply path of the reaction gas, the polymer electrolyte having proton conductivity due to water content, and the electrode material of the electron conductor are formed. There has been a problem that the reaction area at the phase interface gradually narrows, and the battery output decreases.
- the present invention provides a thin polymer electrolyte membrane which can use a perfluorosulfonic acid ionomer having a high proton conductivity to solve the above problems, and which can be formed on a catalyst layer.
- An object of the present invention is to provide an electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell having a low internal resistance and a high output.
- the present invention prevents the raw material liquid for the polymer electrolyte membrane from infiltrating into the porous portion of the catalyst layer of the gas diffusion electrode, so that the film thickness is uniform, the porous portion is not clogged, and the electrode characteristics are improved.
- An object of the present invention is to provide an excellent electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell.
- the present invention provides an electrolyte membrane-electrode assembly that uses a polymer electrolyte having high proton conductivity, is excellent in durability, and exhibits high performance, and a polymer electrolyte fuel configured using the assembly.
- the purpose is to provide batteries. Disclosure of the invention
- the present invention relates to an electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell, comprising: a gas diffusion electrode having a gas diffusion layer and a catalyst layer; and a hydrogen ion conductive polymer electrolyte membrane joined to the gas diffusion electrode.
- a method for producing comprising: a step of forming a proton conductive polymer electrolyte membrane on a support; a treatment step of reducing the adhesive force between the support and the proton conductive polymer electrolyte membrane; A step of peeling and removing the support; and a step of joining a catalyst layer and a gas diffusion layer on the hydrogen ion conductive polymer electrolyte membrane.
- the present invention relates to a method for manufacturing a joined body.
- the production method includes at least one membrane transfer step, and the hydrogen ion conductive polymer electrolyte membrane is supported on a support until an electrolyte membrane-electrode assembly is obtained.
- the manufacturing method includes: (1) a step of forming a hydrogen ion conductive polymer electrolyte membrane on a first support and a second support; (2) a step of forming the hydrogen ion conductive membrane formed on the support. Forming a catalyst layer on the conductive polymer electrolyte membrane; (3) bonding a gasket and a gas diffusion layer to the hydrogen ion conductive polymer electrolyte membrane on the support and the catalyst layer by pressure bonding.
- (4) a step of peeling and removing the support to obtain a first semi-joint and a second semi-joint; and (5) a step of: And pressure-bonding the hydrogen-ion-conductive polymer electrolyte membrane to obtain an electrolyte membrane-electrode assembly.
- a treatment step for reducing the adhesive strength between the polymer and the proton conductive polymer electrolyte membrane it is preferable to include a treatment step for reducing the adhesive strength between the polymer and the proton conductive polymer electrolyte membrane.
- the manufacturing method includes: (I) a step of forming a catalyst layer on a first support and a second support; and (II) covering the catalyst layer formed on the support and a peripheral portion thereof.
- the hydrogen ion conductive polymer (III) 'a step of pressing the first support and the second support with the respective hydrogen ion conductive polymer electrolyte membranes facing each other to obtain a pre-joint; (IV) a step of peeling and removing the first support from the pre-assembly; (V) a gas on the catalyst layer and the hydrogen ion conductive polymer electrolyte membrane exposed in the step (IV).
- a step of pressing the diffusion layer and the gasket (VI) a step of peeling and removing the second support from the pre-joined body, and (VII) the catalyst layer and the hydrogen ion conduction exposed in the step (VI).
- a treatment step for reducing the adhesive force between the support and the proton conductive polymer electrolyte membrane is included.
- the step of forming a hydrogen ion conductive polymer electrolyte membrane on the support may include the step of forming the hydrogen ion conductive polymer electrolyte membrane formed on the transfer support into the support. Preferably, it is a step of transferring to
- the surface or the entire surface of the support is made of a material whose adhesiveness to the hydrogen ion conductive polymer electrolyte membrane is reduced by heating, or a material which volatilizes or sublimates by heating, and the processing step includes removing the support. It is preferably a heating step.
- the surface or the entire surface of the support is made of a material whose adhesiveness to a hydrogen ion conductive polymer electrolyte membrane is reduced by cooling, and the processing step is a step of cooling the support.
- the surface or the entire surface of the support is made of a material whose adhesiveness to the hydrogen ion conductive polymer electrolyte membrane is reduced by irradiation with actinic rays, or a material which volatilizes or sublimates by irradiation with actinic rays. Processing steps The step of irradiating the support with actinic rays is preferred.
- the support has an adhesive layer which can be dissolved in a solvent on the surface, and the treatment step is a step of bringing the support into contact with the solvent.
- the treatment step is a step of reducing or increasing the pressure on the surface of the support opposite to the surface on which the hydrogen ion conductive polymer electrolyte membrane is formed.
- a reinforcing film made of a frame-shaped hydrogen ion conductive film or a gas diffusing film is used to reinforce the hydrogen ion conductive polymer electrolyte membrane, so that a gap is formed between the gasket and the gas diffusion electrode.
- a reinforcing film made of a frame-shaped hydrogen ion conductive film or a gas diffusing film is used to reinforce the hydrogen ion conductive polymer electrolyte membrane, so that a gap is formed between the gasket and the gas diffusion electrode.
- the present invention provides a polymer electrolyte comprising: a hydrogen ion conductive polymer electrolyte membrane; and a gas diffusion electrode that includes a catalyst layer and a gas diffusion layer and is in contact with both surfaces of the hydrogen ion conductive polymer electrolyte membrane.
- a method for producing an electrolyte membrane-electrode assembly for a fuel cell comprising: bonding a hydrogen ion conductive polymer electrolyte membrane and a catalyst layer via a coating layer; removing the coating layer; and
- the present invention also relates to a method for producing an electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell, comprising a step of forming a gas diffusion layer on the catalyst layer to obtain an electrolyte membrane-electrode assembly.
- This manufacturing method comprises: (a1) a step of forming a coating layer on the catalyst layer. (B1) a step of applying a hydrogen ion conductive polymer electrolyte solution on the coating layer. (Cl) Removing to obtain an electrolyte membrane-catalyst layer assembly; and (dl) forming a gas diffusion layer on the catalyst layer.
- the method includes a step of forming
- the method includes the steps of: removing a film to obtain an electrolyte membrane-catalyst layer assembly; and (d 2) forming a gas diffusion layer on the catalyst layer.
- (A3) a step of forming a coating layer containing a hydrogen ion conductive polymer electrolyte on the catalyst layer; and (b3) applying a hydrogen ion conductive polymer electrolyte solution on the coating layer. (C3) removing the coating layer to obtain an electrolyte membrane-catalyst layer assembly, and (d3) forming a gas diffusion layer on the catalyst layer.
- FIG. 1 is a longitudinal sectional view showing an electrolyte membrane forming step and a catalyst layer forming step in one embodiment of the present invention.
- FIG. 2 is a vertical cross-sectional view showing a process of removing the support for the electrolyte membrane after the process of FIG.
- FIG. 3 is a vertical cross-sectional view showing a process up to forming an electrolyte membrane-electrode assembly after the process of FIG.
- FIG. 4 is a longitudinal sectional view showing a process from the catalyst layer forming process to the removal and removal of one electrolyte membrane support in another embodiment of the present invention.
- FIG. 5 is a vertical cross-sectional view showing a process up to the step of FIG. 4 until the other electrolyte membrane support is peeled and removed.
- FIG. 6 is a vertical cross-sectional view showing a process up to forming an electrolyte membrane-electrode assembly following the process of FIG.
- FIG. 7 is a cross-sectional view illustrating a fuel cell electrolyte membrane-electrode assembly manufactured in Example 3. It is a longitudinal cross-sectional view which shows a process.
- FIG. 8 is a longitudinal sectional view showing a manufacturing process of the electrolyte membrane-electrode assembly for a fuel cell in Example 4. .
- FIG. 9 is a vertical cross-sectional view showing a manufacturing process of the electrolyte membrane-electrode assembly for a fuel cell in Example 5.
- FIG. 10 is a vertical cross-sectional view showing a manufacturing process of an electrolyte membrane-electrode assembly for a fuel cell in Comparative Example 2.
- FIG. 11 is a vertical cross-sectional view showing a manufacturing process of an electrolyte membrane-electrode assembly for a fuel cell in Comparative Example 3. .
- FIG. 12 is a diagram conceptually showing the interaction between ionomers and bifunctional amines in the catalyst layer of the electrolyte membrane-electrode assembly in Reference Example 1 of the present invention.
- FIG. 13 is a diagram conceptually showing the interaction between the ionomer in the catalyst layer of the electrolyte membrane-electrode assembly and the basic functional group on the carbon fine powder in Reference Example 2 of the present invention.
- the present invention includes a gas diffusion electrode having a gas diffusion layer and a catalyst layer, and a hydrogen ion conductive polymer electrolyte membrane bonded to the gas diffusion electrode.
- a process for forming a hydrogen ion conductive polymer electrolyte membrane on a support for an electrolyte membrane hereinafter, also simply referred to as a “support”), wherein the support and the high hydrogen ion conductivity are provided.
- a treatment step of reducing the adhesive force between the polymer electrolyte membrane, a step of peeling and removing the support, and a step of joining a catalyst layer and a gas diffusion layer on the hydrogen ion conductive polymer electrolyte membrane The present invention relates to a method for producing an electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell.
- the present invention makes it possible to manufacture an electrolyte membrane-electrode assembly without damaging the electrolyte membrane even when using a thin electrolyte membrane.
- an electrolyte membrane is directly formed on a support by a solvent casting method or the like, or an electrolyte membrane formed on a transfer support is transferred onto a support for an electrolyte membrane.
- an electrolyte membrane is formed on the support.
- each of the pressed battery members supports and protects an electrolyte membrane. Fulfill.
- Each of the electrolyte membranes of the two electrolyte membrane-electrode semi-junctions (the first semi-junction and the second semi-junction) thus formed is press-bonded to provide an anode and a power source.
- each of the crimped battery members serves as a support for protecting the electrolyte membrane.
- the electrolyte membrane is formed on the catalyst layer and on the support on the outer periphery thereof.
- the two supports on which the catalyst layer and the electrolyte membrane are formed are pressed against each other with their surfaces on the electrolyte membrane side facing each other to form a joined body.
- each electrolyte membrane is handled while being supported by the support.
- one of the supports is peeled and removed from the joined body, and the battery member including the gas diffusion layer and the gasket is joined to the surface on the catalyst layer side exposed by the peeling and removal.
- each electrolyte membrane is supported by the other support.
- the crimped battery members serve to support and protect the electrolyte membrane.
- the electrolyte membrane is always protected by the support, or the transfer support or the battery member having a role equivalent thereto. Therefore, even when an electrolyte membrane having low mechanical strength is used due to its thin film thickness, etc., it is possible to manufacture an electrolyte membrane-electrode assembly and a PEFC using the same without damaging the electrolyte membrane. . That is, according to the present invention, the stress applied to the electrolyte membrane by printing, transfer, hot pressing or the like in the manufacturing process of the electrolyte membrane-electrode assembly is absorbed by the support or a battery member that plays a role equivalent thereto. Therefore, a large stress is not applied to the electrolyte membrane, and even if the electrolyte membrane is weak, the electrolyte membrane is not damaged.
- a treatment for reducing the adhesive force between the support and the electrolyte membrane is necessary to perform a process.
- At least the support on which the electrolyte membrane has been formed is irradiated with actinic rays such as ultraviolet rays, X-rays, gamma rays or electron beams, heated, cooled, contacted with a solvent, or Processing steps such as applying a pressure difference using a body are effective.
- actinic rays such as ultraviolet rays, X-rays, gamma rays or electron beams, heated, cooled, contacted with a solvent, or Processing steps such as applying a pressure difference using a body are effective.
- FIG. 1 shows a step of sequentially forming an electrolyte membrane 2 and a catalyst layer 6 on a support 3.
- a hydrogen-ion conductive polymer electrolyte solution is applied to the transfer support 1 by means of a coat, dried, and dried as shown in Fig. 1 (a).
- an electrolyte membrane 2 is formed on the transfer support 1.
- another support 3 that can reduce the adhesive force of the surface to the electrolyte membrane 2 on the transfer support 1 is used to prevent air from entering the joint between the two. Lamine — crimp at evening 4.
- FIG. 1 (c) the transfer support 1 is peeled off from the electrolyte membrane 2, and the electrolyte membrane 2 is transferred onto the support 3.
- the electrolyte membrane 2 transferred on the support 3 and the catalyst layer 6 formed on the support 5 for the catalyst layer are overlapped, and these are hot-pressed by a hot press machine 7. Crimping using.
- the catalyst layer support 5 is separated from the catalyst layer 6, and the catalyst layer 6 is transferred onto the electrolyte membrane 2 as shown in FIG. 1 (e).
- the electrolyte membrane 2 is supported by the transfer support 1 in the steps of FIGS. 1A and 1B, and the electrolyte membrane 2 is supported in the steps of FIGS. 1C to 1E. Since it is supported by the support 3, it is not damaged.
- FIG. 1 (d) the electrolyte membrane 2 transferred on the support 3 and the catalyst layer 6 formed on the support 5 for the catalyst layer are overlapped, and these are hot-pressed by a hot press machine 7. Crimping using.
- the catalyst layer support 5 is separated from the catalyst layer 6, and the catalyst layer 6 is transferred onto the electrolyte membrane 2 as shown in FIG. 1 (e).
- the electrolyte membrane 2
- the electrolyte membrane 2 is formed by the transfer method.However, the electrolyte membrane 2 is formed directly on the support 3 by a solvent casting method in which an electrolyte solution is applied onto the support 3 and dried. You can also.
- FIG. 2 shows the steps from the formation of the catalyst layer 6 on the electrolyte membrane 2 to the separation and removal of the support 3 from the electrolyte membrane 2.
- ultraviolet light is irradiated from the back surface of the support 3 on which the electrolyte membrane 2 and the catalyst layer 6 are formed by an ultraviolet lamp 8.
- the treatment step such as the ultraviolet irradiation, the adhesive force between the two when the electrolyte membrane 2 is formed on the support 3 by the transfer method or the solvent casting method can be almost eliminated.
- the electrolyte membrane 2 is supported on the support 3. It is not damaged because it is carried.
- the support 3 is peeled off from the electrolyte membrane 2 to obtain an electrolyte membrane-electrode semi-junction 13.
- the electrolyte membrane 2 is tightly integrated with the battery member composed of the gas diffusion layer 10, the gasket 9, and the hydrogen ion conductive film 11 processed into a frame. . Therefore, the stress applied to the electrolyte membrane 2 when the support 3 is peeled off is reduced by these battery members.
- the adhesive force with the support 3 is reduced by the above-described processing step, so that the electrolyte membrane 2 is damaged at all. Without this, the support 3 can be easily peeled off, and the electrolyte membrane-electrode semi-junction 13 can be obtained.
- the treatment for reducing the adhesive force may be performed on the support 3 on which the electrolyte membrane 2 and the catalyst layer 6 are formed, as shown in FIG. 2 (a), for example, as shown in FIG. 2 (c).
- the same effect can be obtained by applying it to the support 3 after being integrated with the member.
- a gas diffusive film may be used instead of the hydrogen ion conductive film 11.
- FIG. 3 shows the steps for manufacturing the joined body.
- the respective electrolyte membranes 2a and 2b of each of the semi-joints 13 and 14 are opposed to each other as shown in FIG. 3 (a), and crimped using a hot press machine 15 as shown in FIG. 3 (b). I do.
- electrolyte membrane-electrode bonding as shown in Fig. 3 (c)
- the body is obtained. Furthermore, to deaerate air from the joined body, leave it in a reduced pressure container for 10 minutes.
- the two half-junctions 14 to which the hydrogen ion conductive film 11 is not pressed are connected between the respective electrolyte membranes 2 by the frame-shaped hydrogen ion conductive film 11 or gas diffusive.
- the electrolyte membrane-electrode assembly may be produced by pressure bonding with a film interposed. Thereby, the effect of protecting the electrolyte membrane near the gap between the gasket and the gas diffusion electrode can be obtained.
- FIG. 4 shows the two supports 21 a and 21 b (half) on which the catalyst layer 22 and the electrolyte membrane 23 are formed from the step of forming the catalyst layer 22 on the support 21 for the electrolyte membrane. This shows the process from peeling and removing one of the supports 21a from the joined body obtained by pressing the respective electrolyte membranes 23a and 23b.
- a catalyst layer 22 is formed on a support 21 as shown in FIG.
- the electrolyte membrane 23 is formed on the catalyst layer 22 and the support 21 outside the catalyst layer 22.
- the method for forming the electrolyte membrane 23 may be a method in which the electrolyte membrane is formed directly on the support 21 on which the catalyst layer 22 is formed, or a method in which the electrolyte membrane formed on the support for transfer in advance is used as the support Either of the methods of transferring onto 21 may be used.
- the two supports 21 a and 21 b on which the catalyst layer 22 and the electrolyte membrane 23 were formed were separated from the respective electrolyte membranes 23 a and 23 b as shown in FIG. 4 (c).
- the pre-assembly 25 is obtained by pressing and joining with a hot press machine 24 so as to face each other.
- the pre-assembly 25 is irradiated with ultraviolet rays from one surface thereof by an ultraviolet lamp 26 as shown in FIG. Figure above 4
- the electrolyte membranes 23a and 23b are not damaged since they are supported by the supports 21a and 21b, respectively.
- the support 21a is peeled off from the pre-assembly 25 as shown in FIG.
- the adhesive force between one support 21a and the electrolyte membrane 23a can be almost eliminated by a treatment step such as irradiation with ultraviolet light, and the electrolyte membrane 23a is further removed by the support 2a. Since the support is supported by 1b, the support 21a can be easily peeled off without damaging the electrolyte membrane 23a.
- FIG. 5 shows a process from peeling and removing one support 21a from the pre-joined body 25 to peeling and removing the other support 21b.
- the pre-joined body 27 from which the support 21a has been peeled is irradiated with ultraviolet rays from the other support 21b from the side of the other support 21b.
- the battery member composed of the gas diffusion layer 29, the gasket 30 and the frame-shaped gas diffusion film 31 subjected to the water repellent treatment was combined with the catalyst layer 22a of the joined body 27 irradiated with ultraviolet rays.
- the electrolyte membrane 23a is superposed on the exposed side as shown in FIG. 5 (b), and pressed by a hot press machine 32 to integrate them as shown in FIG. 5 (c). In each of the steps shown in FIGS.
- the electrolyte membranes 23a and 23b are damaged because they are supported by the support 21b or the crimped battery members 29 to 31. Then, the other support 21b is peeled off from the integrated one as shown in FIG. 5 (c) as shown in FIG. 5 (d). In this case, the adhesive strength between the electrolyte membrane 23 b and the support 21 b is reduced by the irradiation of the ultraviolet light, and the electrolyte membrane 23 b is supported by the crimped battery members. The support 21b can be easily peeled off and removed without damaging the electrolyte membrane 23b.
- FIG. 6 shows a step of completing the electrolyte membrane-electrode assembly according to the present invention.
- the catalyst layer 2 2b of the composite (FIG. 5 (d)) obtained by integrating the electrolyte membranes 23a and 23b and the battery members 29 to 31 etc.
- the gasket 33 and the gas diffusion layer 34 subjected to the water-repellent treatment are overlapped on the exposed surface of the gasket 33 and the electrolyte membrane 23b, and these are pressed by a hot press machine 35, and are pressed in FIG. 6 (b).
- Such an electrolyte membrane-electrode assembly is constituted.
- essential components of the integrated battery member are a gas diffusion layer and a gasket. Further, it is preferable to integrate a frame-shaped gas diffusive film or a hydrogen ion conductive film.
- the adhesive force between the support and the electrolyte membrane is set to be larger than that of the transfer support; It is necessary that the adhesive force between the support and the electrolyte membrane when the electrolyte membrane is formed on the support can be changed so small that the electrolyte membrane can be easily peeled and removed by the processing steps after the formation of the electrolyte membrane.
- the material of the electrolyte membrane support capable of reducing the adhesive strength to the electrolyte membrane by a heating process include, for example, a heat-peelable sheet (for example, Nippon Denko Co., Ltd. “Riba Alpha” No.
- LS No. 3198 MS, No. 3198 HS, etc.
- This is obtained by applying a heat-peelable pressure-sensitive adhesive on a polyester base sheet.
- a sheet material in which a layer sublimated by heat is formed on the surface of the support include, for example, triazole, triazine, benzotriazole, nitrobenzotriazole, methylbenzotriazole, naphthol, quinoline, and hydroxyquinoline. These include quinolidine, morpholine and cyclohexylamine.
- Examples of the material of the support that can reduce the adhesive force by the cooling process include natural rubber, cis-isoprene rubber, styrene-nosoprene rubber, butadiene rubber, nitrile rubber, chloroprene rubber, chlorosulfonated polyethylene, and polysulfide rubber.
- a tackifier such as an alkylphenol Z formaldehyde resin, a coumarone / indene resin, a xylene Z formaldehyde resin, or polybutene may be added to these materials.
- Examples of the material of the support that can reduce the adhesive force by the process of irradiating actinic light include dicing tape (for example, manufactured by Nitto Denko Corporation).
- “Elep Holder” UE—111 AJ, UE—2092J, NBD—517 K :, and Lintec Corporation: “Adwi 1 1” D—6 2 4.D—6 50 etc.) can be used. These are obtained, for example, by applying an acryl-based pressure-sensitive adhesive on a polyolefin base material sheet. Further, a sheet material in which a layer sublimated by irradiation with actinic rays on the surface of the support can be used. Examples of the material that sublimates upon irradiation with actinic light include resist materials such as poly (2,2,2-trifluoroethyl-chloroacrylate) and materials that are susceptible to polymerization by actinic light such as polyacetal. No. As actinic rays, X-rays, gamma rays, or electron beams can be used in addition to ultraviolet rays. Monkey
- a sheet material having a surface on which an adhesive layer soluble in a solvent is formed can be used.
- a material for the adhesive layer for example, when the solvent is water, a water-soluble ink (for example, MS-03C manufactured by Jujo Chemical Co., Ltd.), polyvinyl alcohol, polyethylene oxide, polyacrylamide, polyacrylamine, polyvinyl Synthetic polymers such as pyrrolidone, natural starches such as potato starch, sweet potato starch, corn starch, and processed starches obtained by oxidizing, alfalizing, etherifying or esterifying them, and celluloses such as carboxymethylcellulose and methylcellulose Derivatives, proteins, gelatin, glue, casein, shellac, acacia, dextrin and the like can be used.
- the solvent is an organic solvent
- use natural rubber, asphalt, black chloroprene resin, nitrile rubber resin, styrene resin, butyl rubber, polysulfide, silicone rubber, vinyl acetate, or ditrocellulose can be.
- it is also effective to peel the support while injecting gas into the bonding portion between the support and the electrolyte membrane. .
- this method it is possible to prevent the electrolyte membrane from being damaged at the time of peeling, and to prevent peeling between the electrolyte membrane and the catalyst layer or between the catalyst layer and the gas diffusion layer.
- Embodiments 1 and 2 of the present invention as a method of forming an electrolyte membrane on a support, there is a method of forming an electrolyte membrane on a transfer support, and then transferring the electrolyte membrane to the support.
- ultra-high molecular weight polyethylene porous sheet such as “SUNMAP” manufactured by Nitto Denko Corporation. Air permeability of paper, synthetic paper, cloth, non-woven fabric, leather, cellulose, cellophane, or cell mouth It is effective to use a porous plate as the material of the support. You.
- the electrolyte membrane is formed directly on the support, the solvent of the electrolyte solution is impregnated into the porous support and a good membrane cannot be formed. Is not preferred.
- the pressure is reduced or increased with a gas from the surface opposite to the surface on which the electrolyte membrane is formed by the transfer method on the support made of the gas-permeable porous plate.
- the adhesive force between the support and the electrolyte membrane can be easily controlled.
- the pressure is reduced when it is necessary to increase the adhesive strength to the electrolyte membrane.
- the electrolyte membrane is peeled by relaxing the pressure or applying pressure. Can be removed.
- the support made of the porous sheet is peeled off from the electrolyte membrane, it is also effective to impregnate the support with a liquid such as water and change the adhesive strength with the electrolyte membrane for peeling.
- a liquid such as water
- the support itself or a surface-treated portion of the support is not affected by the solvent of the electrolyte solution.
- the transfer support carries a thin electrolyte membrane, and is used for transferring the electrolyte membrane to the electrolyte membrane support.
- the base material include polyester, polyphenylsulfan, polypropylene, polyethylene, polyvinyl chloride, acetate, polystyrene, polycarbonate, polyimide, aramide, polybutylene terephthalate, polyether sulfone, and polyester ether.
- Film of resin such as terketone, polyterimide, polysulfone, polyfuramide. Polyamide imide, polyketone, polyarylate, etc.
- the appropriate thickness of the transfer support is 10 to 100, and the base material has a small critical surface tension, that is, the contact with the electrolyte membrane, in order to improve the peelability of the electrolyte membrane. It is preferable to use a material having a small adhesion.
- the above-mentioned resin film base material is used as a transfer support, such as polyethylene wax, paraffin wax, higher aliphatic alcohol, organopolysiloxane, and anion-based.
- Surfactants cationic surfactants, amphoteric surfactants, nonionic surfactants, fluorosurfactants, metal stones, organic carboxylic acids and their derivatives, fluororesins, silicone resins, dimethylsilico Lubricants such as silicone oils, epoxy-modified silicone oils, reactive silicone oils, alkyl-modified silicone oils, amino-modified silicone oils, reactive compounds of silane coupling agents, silicone rubber, silicone compounds, and silicone wax Two of them It can be used those obtained by coating a mixture of above.
- the electrolyte layer of the electrolyte layer-electrode assembly is composed of two electrolyte membranes, and the electrolyte membrane of a thin film having a defect such as a pinhole is used. Even when used, an electrolyte layer is formed by pressing the two membranes together. As a result, the probability that a defective portion of the film overlaps to form a through hole is extremely small, so that highly reliable PEFC can be obtained.
- the proton conduction channel is cut off. Further, three of the defective part of the first electrolyte membrane, the air layer, and the defective part of the second electrolyte membrane are fuel Forming channels through which gas and air can pass Crossover may occur.
- the air remaining at the joint is evacuated. Degassing may be performed in the chamber. In this case, it is preferable to put the electrolyte layer-electrode assembly in the vacuum chamber and gradually and stepwise reduce the pressure so as not to cause partial rupture of the assembly due to rapid expansion of the remaining air. It is also effective to prevent partial rupture by leaving the joined body in an autoclave of several atmospheres while heating it before putting the joined body in the vacuum chamber.
- the electrolyte membrane surfaces of two supports each having a catalyst layer and an electrolyte membrane on one surface are overlapped, and wedge-shaped from the end. It is preferable to press the roll little by little with a roll. It is also effective to use a heat roller to perform pressure welding.
- the electrolyte membrane is a thin membrane having a thickness of 3 to 10 m. It is effective.
- a frame-shaped reinforcing film made of a hydrogen ion conductive film or a gas diffusing film is provided so as to cover the electrolyte layer in a gap between the gasket and the gas diffusion electrode.
- a frame-shaped reinforcing film made of a hydrogen ion conductive film or a gas diffusing film is provided so as to cover the electrolyte layer in a gap between the gasket and the gas diffusion electrode.
- the gap between the gasket and the gas diffusion electrode where stress is most likely to be concentrated is covered with the reinforcing film, and the gap between the gasket and the gas diffusion electrode and the vicinity of the gap are formed in the process of forming the electrolyte membrane-electrode assembly. Since the electrolyte membrane is protected, it is possible to prevent the electrolyte membrane in this portion from being torn, and to prevent scratches and pinholes.
- a pressure difference between the fuel gas and the air generated between the gasket and the gas diffusion electrode, or a pinhole or film breakage due to stress caused by the sliding of the film due to a change in humidity, and gas diffusion Damage to the electrolyte layer such as partial cutting due to the edge of the electrode can be prevented.
- the adhesiveness between the catalyst layer and the conductive film Will be better. This is because a proton conductive resin of the same quality as the hydrogen ion conductive film is contained in the catalyst layer.
- the hydrogen ion conductive film at the portion inserted under the gasket is interposed between the gasket and the electrolyte layer, but the adhesion between the hydrogen ion conductive film and the gasket is good, so the fuel cell Does not interfere with sealing.
- the film when the film is provided between the electrolyte membranes or between the electrolyte layer and the catalyst layer, the film does not reduce the reaction area of the gas diffusion electrode because the film has proton conductivity. .
- a perfluorosulfonic acid-based electrolyte membrane is particularly preferable because of its high strength. Examples of such films include Naphion 112 manufactured by Dupont, USA, Flemion manufactured by Asahi Glass Co., Ltd., GORE-SELECT manufactured by Japan Gore-Tex Co., Ltd., and Acipe manufactured by Asahi Kasei Co., Ltd. 1 Use ex etc. Can be.
- the gas diffusing film it is preferable to use a film having a high air permeability, a thin film thickness, and a sufficient strength.
- a fluorine-based polymer is used as a highly reliable material satisfying these conditions.
- a specific example is a porous film of 4-fluoroethylene resin (for example, MICR-I-TEX manufactured by Nitto Denko Corporation).
- a frame-shaped thick film portion is provided on the electrolyte membrane, and the thick film portion is arranged so as to cover a gap between the gasket and the gas diffusion electrode. Is preferred.
- the thick film portion has an effect of preventing breakage of the electrolyte membrane during the PEFC manufacturing process or during operation. Further, since the film thickness portion is formed of an electrolyte, the proton conductivity of PEFC is hardly impaired.
- a method of forming a frame-shaped thick film portion on an electrolyte membrane a method of screen-printing an electrolyte solution in a frame shape on an electrolyte film formed to a uniform thickness, or a method of forming an electrolyte solution using a metal mask. It is effective to apply a spray coating in a frame shape.
- the present invention includes a hydrogen ion conductive polymer electrolyte membrane, a catalyst layer and a gas diffusion layer, and is bonded to both surfaces of the hydrogen ion conductive polymer electrolyte membrane.
- a method for producing an electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell having a gas diffusion electrode comprising: joining a hydrogen ion conductive polymer electrolyte membrane and a catalyst layer via a coating layer; A step of removing the coating layer, and a step of forming a gas diffusion layer on the catalyst layer to obtain an electrolyte membrane-one-electrode assembly. It also relates to the method of body production.
- a polymer electrolyte membrane is formed directly on the catalyst layer as compared to the conventional method of manufacturing a membrane-electrode assembly for a fuel cell, no stress is applied during the process, and a thin film is formed without tearing
- the polymer electrolyte raw material solution was directly applied to the catalyst layer, the solution permeated the porous catalyst layer, and it was difficult to obtain a good membrane.
- the medium referred to here must be a medium that has a relatively smooth surface, is not porous, and can form a thin polymer electrolyte membrane.
- the present invention relates to a method for producing an electrolyte membrane-electrode assembly obtained by bonding a catalyst layer and a gas diffusion electrode to both surfaces of a hydrogen ion conductive polymer electrolyte membrane, wherein (1) the catalyst Arranging a medium on the layer; (2) forming a polymer electrolyte membrane on the medium; and (3) removing the medium to form the bonded body.
- any of the steps (1) and (2) at this time may be performed first.
- the preferred embodiment of the second production method of the present invention will be described by dividing into which of the steps (1) and (2) is performed first. I will tell.
- the method for producing an electrolyte membrane electrode for a fuel cell according to Embodiment 3 of the present invention is a method of first forming a coating layer as a medium on a catalyst layer,
- the coating layer must be finally removed, and in the step (al), a material that sublimes at 200 ° C or less, a material that thermally decomposes at 200 ° C or less. It is effective to form the coating layer from a material, a material that decomposes in ultraviolet light and dissolves in a solvent, a water-soluble material, or a material that dissolves in an organic solvent.
- the temperature is set at 200 ° C. or lower because the polyfluorosulfonic acid ionomer, which is a polymer electrolyte, does not thermally decompose at 200 ° C. or lower.
- Materials that sublime below 200 ° C include, for example, triazole, triazine, benzotriazole, nitrobenzotriazole, methylbenzotriazole, naphthyl, quinoline, hydroxyquinoline, quinolizine, morpholine and Hexylamine and the like. These can be made into a paste with a solvent such as alcohol or ether and applied to form a layer.
- Examples of the material that can be thermally decomposed at a temperature of 200 ° C. or lower include polyoxymethylene, poly (methylene sulfone), polypropylene oxide, polyisoprene, polymethyl methacrylate, and polymethyl acrylate.
- Examples of materials that decompose and sublimate with ultraviolet light include resist materials such as poly (2,2,2-trifluoroethyl) chloroacrylate, and materials that are easily depolymerized by ultraviolet light such as polyacetyl. Is mentioned.
- a photosensitive resin As a material that is decomposed by ultraviolet rays and dissolved in a solvent, a photosensitive resin can be used, and examples thereof include poly (methyl isopro- ketone).
- water-soluble material examples include synthetic polymers such as polypinyl alcohol, polyethylene oxide, polyacrylamide, polyacrylamine, and polyvinylpyrrolidone; natural polymers such as potato starch, evening starch, and corn starch. Starch and oxidized, pregelatinized, esterified or esterified processed starch, cellulose derivatives such as carboxymethylcellulose, methylcellulose, protein, gelatin, glue, casein, shellac, gum arabic, dextrin, etc. There is.
- Examples of the material soluble in the organic solvent include natural rubber, asphalt, chloroprene resin, nitrile rubber resin, styrene resin, butyl rubber, polysulfide, silicone rubber, vinyl acetate, and nitrocellulose.
- natural rubber asphalt, chloroprene resin, nitrile rubber resin, styrene resin, butyl rubber, polysulfide, silicone rubber, vinyl acetate, and nitrocellulose.
- the coating layer can be formed into a thin and uniform layer, it is effective to form the coating layer by screen printing, roll coating, or spray coating.
- a person skilled in the art can appropriately select a method of forming the coating layer and a drying method thereafter, depending on the material of the coating layer, the formation conditions, and the like.
- the concentration, the temperature, and the like may be selected within a range having a film forming ability.
- step (bl) A polymer electrolyte membrane is formed on the coating layer thus formed.
- the same polymer electrolyte solution as in the related art may be used, and the concentration, the temperature, and the like can be appropriately selected. Further, it is effective to form this polymer electrolyte layer by screen printing, by mouth-coating or spray coating as in the case of the coating layer.
- the coating layer is removed.
- This removal can be selected according to the type and characteristics of the material forming the coating layer, and a method such as heating, ultraviolet irradiation, or dissolution in water or a solvent can be used.
- the method used here needs to be performed under conditions that do not impair the performance of the obtained joined body, and such conditions can be appropriately selected by those skilled in the art.
- a gas diffusion layer is formed on the catalyst layer according to a conventional method to obtain an electrolyte membrane-electrode of the present invention.
- a battery member such as a gasket may be provided.
- Embodiment 4 of the present invention relating to a case where a polymer electrolyte membrane is formed on a medium first is obtained by bonding a catalyst layer and a gas diffusion electrode to both surfaces of an ion-conductive polymer electrolyte membrane.
- A2 a step of forming a hydrogen ion conductive polymer electrolyte membrane on a polymer film,
- B2) a step of forming the hydrogen ion conductivity of the polymer film.
- a polymer film serving as a medium is formed in advance.
- This polymer film may be the same material as the coating layer in the third embodiment described above. That is, the polymer film is composed of a material that sublimes at 200 ° C. or less, a material that thermally decomposes at 200 ° C. or less, a material that decomposes and sublimates by ultraviolet rays, a material that decomposes by ultraviolet rays and dissolves in a solvent, It can be formed of a conductive material or a material soluble in an organic solvent. However, since it is formed separately from the gas diffusion electrode, a high molecular film may be formed by, for example, dropping or coating on a glass plate, a dish, or a film, and drying.
- a polymer electrolyte membrane is formed on the polymer film.
- the same material as in Embodiment 3 can be used, and can be formed by screen printing, mouth-to-mouth printing, or a spray coating method.
- a polymer film having a polymer electrolyte membrane formed on one side is disposed on the catalyst layer of the gas diffusion electrode on the side having no polymer electrolyte membrane, and finally the coating layer is formed in the third embodiment.
- the conjugate according to the present invention can be obtained by removing the polymer film in the same manner as when removing the polymer film.
- the method for arranging the polymer film on the gas diffusion electrode is not particularly limited, and may be, for example, a mechanical arrangement.
- the present invention relates to a method for producing an electrolyte membrane-electrode assembly comprising a catalyst layer and a gas diffusion electrode joined to both sides of an ion-conductive polymer electrolyte membrane, wherein (a 3) Forming a coating layer made of an ion conductive polymer electrolyte; (b3) forming a hydrogen ion conductive polymer electrolyte solution on a surface of the coating layer opposite to a surface in contact with the catalyst layer; Apply (C3) a step of removing the coating layer; and (d3) a step of forming a gas diffusion layer on the catalyst layer to obtain an electrolyte membrane-catalyst layer assembly. . .
- the coating layer is made of the same material as the polymer electrolyte membrane. As described above, a medium is required to prevent the polymer electrolyte solution from penetrating into the catalyst layer. In this embodiment, the gelation is performed by utilizing the gelling phenomenon of the polymer electrolyte. This layer is used as a layer for preventing permeation into the catalyst layer.
- a small amount of the polymer electrolyte membrane raw material solution is sprayed on the catalyst layer by a spray to evaporate the solvent.
- a solvent such as ethyl alcohol
- gelation occurs when the concentration of the polymer electrolyte becomes 10% to 20% .Therefore, the solvent evaporates and the polymer layer becomes jelly-like on the surface of the catalyst layer. Forms a semisolid gelled layer.
- the solvent volatilization state of the polymer electrolyte solution when it reaches the catalyst layer surface can be controlled. It is possible to limit the invasion of only the surface part. By repeating this operation several times, a thin gelled layer of the polymer electrolyte solution can be formed so as to fill the surface of the catalyst layer, and then the catalyst layer is shortened at 100 ° C to 140 ° C. After drying for a time, a coating layer that is no longer soluble in solvents such as ethyl alcohol can be formed.
- the coating layer serves as a blocking layer for the raw material solution to the catalyst layer, and the polymer electrolyte membrane can be formed favorably. Since the coating layer is made of the same material as the polymer electrolyte membrane, it can exhibit proton conductivity as a part of the polymer electrolyte membrane after the formation of the polymer electrolyte membrane.
- a gas diffusion electrode is provided on one side of the polymer electrolyte membrane.
- a catalyst layer and carbon paper are bonded to the other side of the polymer electrolyte membrane, and the fuel cell electrolyte is formed.
- a membrane-electrode assembly can be obtained.
- the present inventors formed an excellent electrolyte membrane for a fuel cell-electrode by forming a catalyst layer with a catalyst body composed of a noble metal catalyst and carbon powder, a polymer electrolyte, and a mixture containing a polyfunctional basic compound. Can be produced.
- the present invention provides a polymer electrolyte membrane and a pair of electrodes disposed on both sides of the polymer electrolyte membrane, wherein at least one of the electrodes is a catalyst body comprising a noble metal catalyst and carbon powder, a polymer electrolyte, and a polyelectrolyte.
- an electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell comprising: a catalyst layer comprising a mixture containing a functional base compound; and a gas diffusion layer.
- the polyfunctional basic compound is a polyfunctional amine.
- the catalyst layer contains 0.1 to 10 wt% of a polyfunctional basic compound with respect to the polymer electrolyte.
- the present invention comprises a polymer electrolyte membrane and a pair of electrodes disposed on both sides of the polymer electrolyte membrane, and at least one of the electrodes comprises a noble metal catalyst and a carbon powder having a basic surface functional group.
- the invention also provides an electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell, which is characterized by being constituted by a catalyst layer comprising a catalyst and a polymer electrolyte, and a gas diffusion layer. It is effective that the basic surface functional group is an amine.
- the present invention provides a polymer comprising a polymer electrolyte membrane and a pair of electrodes disposed on both sides of the polymer electrolyte membrane, wherein the polymer electrolyte membrane contains a polyfunctional basic compound.
- an electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell comprising an electrolyte membrane and a gas diffusion electrode.
- the polyfunctional basic compound is a polyfunctional amine. It is also effective that the polymer electrolyte membrane contains 1 to 10 wt% of the polyelectrolyte, based on the polyelectrolyte. It is also effective that the main chain of the polyfunctional basic compound is substituted with fluorine.
- An assembly for a polymer electrolyte fuel cell comprising a polymer electrolyte membrane and a gas diffusion electrode according to the present invention contains a polyfunctional basic compound or a carbon powder having a basic surface functional group.
- This polyfunctional basic compound can be contained in the polymer electrolyte membrane and / or the catalyst layer constituting the conjugate, and binds to a part of the sulfonic acid group of the polymer electrolyte ionomer. A three-dimensional network is formed so that the ionomer is less likely to flow into the gas diffusion layer due to drain water.
- the carbon powder having a basic surface functional group can be included in the catalyst layer constituting the electrolyte membrane-electrode assembly, and binds to a part of the sulfonic acid groups of the ionomer of the polymer electrolyte to form the ionomer. Dissolve in drain water to prevent runoff. As a result, the gas diffusion layer maintains the gas permeability, and the catalyst layer and the polymer electrolyte membrane exhibit the function of not easily impairing the proton conductivity.
- An electrolyte membrane-electrode assembly comprising the polymer electrolyte membrane according to the present invention and a pair of electrodes disposed on both sides of the polymer electrolyte membrane will be described.
- the electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell of the present invention comprises a polymer electrolyte membrane and a pair of polymer electrolyte membranes disposed on both sides of the polymer electrolyte membrane. And at least one of the electrodes
- the electrode is composed of a catalyst body composed of a noble metal catalyst and carbon powder, a catalyst layer composed of a mixture containing a polymer electrolyte and a polyfunctional basic compound, and a gas diffusion layer composed of carbon paper, carbon cloth and the like.
- this multifunctional basic compound 211 binds to a part of the sulfonic acid group of ionomer 212 to form a three-dimensional network and suppresses the ionomer outflow. It has the effect of doing.
- the polyfunctional basic compound only needs to have two or more functional groups capable of reacting with a sulfone group in one molecule.
- bifunctional amines such as ethylenediamine, 1,2-propylenediamine, tetramethylenediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, nonamethylenediamine, and trifunctional amines such as diethylenetriamine
- Aromatic polyfunctional amines such as benzenebenzene, 1,2,3-triaminobenzene, 1,2,3,4-tetraaminobenzene, 1,5-diazabicyclo [4.3.0] nona-1-ene , 1,8-diazabicyclo [5.4.0]
- Compounds having an amidino group such as pendecar 7-ene, N-containing polysaccharides such as streptomycin, vitamins such as vitamin B2 and vitamin B12 , Azanaphthalenes such as xampterin,
- the chemical reaction between acid and base occurs under relatively mild conditions
- the polyamine is a polyfunctional amine.
- the hydrogen of the skeleton portion of the polyfunctional basic compound is substituted with fluorine.
- the fluorine-substituted polyfunctional amines include tetrafluoro-p-phenylenediamine, 4,4 'diaminooctafluorobiphenyl, 2,4,6—tris (perfluoroheptyl) —1,3, 5-triazine and the like.
- the content of the polyfunctional basic compound in the catalyst layer is preferably 0.1 to 10 wt% with respect to the polymer electrolyte. This is because the effect on proton conductivity is small if the substitution rate is about several percent of the total number of acid groups such as sulfonic acid.
- the electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell comprises a polymer electrolyte membrane and a polymer electrolyte membrane.
- a catalyst comprising a noble metal catalyst and a carbon powder having a basic surface functional group, and a catalyst layer comprising a polymer electrolyte; and a gas layer comprising at least one electrode comprising a pair of electrodes arranged on both sides. It is composed of a diffusion layer.
- the basic surface functional group 221 of the carbon powder 223 in the catalyst layer binds to a part of the sulfonic acid groups of the ionomer 224 to suppress the outflow of ionomer. This has the effect.
- the basic surface functional group 221 on the carbon powder 222 is replaced with, for example, a carboxyl group on the surface of the carbon powder.
- the basic surface functional groups are preferably amines from the viewpoint that a chemical reaction between an acid and a base occurs under relatively mild conditions.
- the number of basic surface functional groups on the carbon powder may be one. salt
- the basic substance is a single molecule
- the cross-linking effect does not exist unless it has two or more functional groups, so that the basic substance flows out together with the ionomer.
- the substrate of the basic substance is a carbon powder
- the carbon powder is fixed in the catalyst layer, so that even a single basic functional group does not flow out with ionomer.
- a basic functional group there is no need for a basic functional group to be present on the surface of the entire carbon powder.
- the electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell comprises a polymer electrolyte membrane and electrodes disposed on both sides of the membrane.
- the polymer electrolyte membrane contains a polyfunctional basic compound.
- the polyfunctional basic compound is preferably a polyfunctional amine, and the weight of the polyfunctional basic compound with respect to the polymer electrolyte is 1 to 10 wt%. Preferably it is. This is because if the substitution rate of an acid group such as sulfonic acid is low, the effect on proton conductivity is small.
- an acid group such as sulfonic acid
- An electrolyte membrane-electrode assembly was manufactured by the steps described above with reference to FIGS. 1 to 3, and PEFC was manufactured using this.
- an electrolyte membrane 2 was formed on a support 3 by a transfer method, and a catalyst layer 6 was formed thereon by a transfer method.
- the electrolyte solution is a 9 wt% alcohol solution of the electrolyte (Asahi Glass Co., Ltd .: trade name Flemion FSS-1 solution) for preventing gelation. And diluted to an 8% by weight solution.
- a 50-m-thick polypropylene film (trade name: Torayan, manufactured by Toray Industries, Inc.) was used.
- the coating film of the electrolyte solution was heated and dried in an infrared oven to form an electrolyte film 2 having a thickness of 6 m.
- an ultraviolet release tape (D_624: manufactured by Lintec) was used.
- a catalyst film 5 was formed on the support 5 for the catalyst by using a polypropylene film having a film thickness of 50 (trade name: Torayfan Co., Ltd.) as follows. First, conductive carbon particles with a specific surface area of 800 m 2 Zg (Ketjen Black International, trade name: Ketjen Black EC) were charged with platinum particles having an average particle size of about 30 ⁇ by weight. : 40 g supported at a ratio of 1 was placed in a glass container. To the glass container, 120 g of water was added while stirring with an ultrasonic stirrer, and 210 g of Flemion FSS-1 solution was further added with stirring to prepare a catalyst paste.
- a polypropylene film having a film thickness of 50 (trade name: Torayfan Co., Ltd.) as follows. First, conductive carbon particles with a specific surface area of 800 m 2 Zg (Ketjen Black International, trade name: Ketjen Black EC) were charged with platinum particles having an average particle size of
- the paste was stirred for 1 hour with an ultrasonic stirrer, then spread on a catalyst support 5 using a barco, and dried at room temperature to form a catalyst layer 6.
- the temperature was raised to 100 ° C. while applying a pressure of 4 kgf / cm 2 , followed by hot pressing at a pressure of 40 kg fZcm 2 .
- a semi-assembly of an electrolyte membrane and one electrode was constructed by the steps of FIGS. 2 (a) to 2 (d).
- ultraviolet irradiation step ultraviolet irradiation at 365 nm and 2000 mJ / cm 2 was performed.
- a water-repellent treatment is performed by immersing an aqueous dispersion containing fluorocarbon resin at 50% by weight (D1 manufactured by Daikin Co., Ltd.) in water diluted 1/2.
- a carbon paper having dimensions of 100 mm ⁇ 200 mm was used, and a hydrogen ion conductive film reinforced with a fluoropolymer cloth was used as the hydrogen ion conductive film 11.
- an electrolyte membrane-electrode assembly was formed by the steps shown in FIGS. 3 (a) to 3 (c). In each hot press process in Figs. 2 and 3, 5 kgf / While pressing the cm 2 After heating to 1 3 0 ° C, 5 0 kgf / cm 2 in the hot Topuresu between 1 0 minutes.
- the electrolyte membrane-electrode assembly was put into a decompression vessel to degas air from the electrolyte membrane of the pressed electrolyte membrane-electrode assembly, and the pressure was slowly reduced from atmospheric pressure. The pressure was increased to 0.1 atm in 10 minutes. Thereafter, the pressure was further reduced to 0.01 atm over 10 minutes, and then reduced to 0.01 atm, and left for 30 minutes. The electrolyte membrane-electrode assembly was taken out of the reduced pressure vessel and observed. As a result, it was confirmed that air trapped between the electrolyte membranes escaped in the reduced pressure vessel and bubbles were lost.
- a PEFC was fabricated using this electrolyte membrane-electrode assembly, and the operating characteristics were evaluated.
- manifold holes for the flow of the cooling medium, the fuel gas, and the oxidizing gas were formed in the gasket 9 of the electrolyte membrane-electrode assembly.
- a cell in which an oxidizing gas channel was formed on one surface of the electrolyte membrane-electrode assembly and a separator in which a fuel gas channel was formed on the other surface were overlapped to obtain a unit cell. Two of these cells are stacked, and the two cell stacks are sandwiched between separators having a cooling medium flow path. This pattern is repeated to produce a fuel cell stack including 100 cells. did.
- each separator was 1.3 mm, and the depth of the oxidizing gas channel, fuel gas channel or cooling medium channel was 0.5 mm.
- a current collector plate, an insulating plate, and an end plate were arranged at both ends of the fuel cell box, and these were fixed with fastening rods to produce a PEFC.
- the fastening pressure at this time was 10 kgf / cm 2 .
- the PEFC was fabricated in this manner, the fuel utilization ratio 8 5%, an oxygen utilization rate of 6 0%, current density 0.7 to perform continuous power generation test under conditions of A / cm 2, the single cells per 0.7 V discharge Voltage was obtained. From this, a high output of 0.49 W / cm 2 was obtained.
- the fuel electrode anode
- the gas obtained by steam reforming of methane is reduced to a carbon monoxide concentration of 50 ppm or less, and fuel gas humidified and heated to a dew point of 70 ° C is supplied to the air electrode ( The humidified and heated air was supplied as an oxidizing gas to the dew point of 45 ° C on the side of the power source).
- the temperature of PEFC was maintained at 75 ° C by using cooling water as the cooling medium.
- Example 1 The same electrolyte solution as in Example 1 was applied onto the same electrolyte membrane support as in Example 1 using a coater, and dried by heating with an infrared heater. Formed directly on top. Except for the above, an electrolyte membrane-electrode assembly and PEFC were prepared and evaluated in exactly the same manner as in Example 1. As a result of the decompression test of the electrolyte membrane-electrode assembly, it was confirmed that the air entrapped between the electrolyte membranes escaped in the decompression vessel and the bubbles disappeared. Further, in a continuous power generation test of PEFC using this electrolyte membrane-electrode assembly, a high discharge voltage of about 0.7 V per cell was obtained as in Example 1. Comparative Example 1
- Example 1 Except that the hydrogen ion conductive film of Example 1 was replaced with a 50-m-thick fluoropolymer film (Naflon tape, manufactured by Nichias Co., Ltd.) as a material for the reinforcing film, it was completely the same as Example 1. In the same manner, an electrolyte membrane-electrode assembly and PEFC were fabricated and evaluated. As a result of the decompression test, it was confirmed that the joining portion of the reinforcing film of the joined body taken out of the pressure reducing container was easily peeled off.
- a 50-m-thick fluoropolymer film Naflon tape, manufactured by Nichias Co., Ltd.
- Example 3 In a continuous power generation test of PEFC using this electrolyte membrane-electrode assembly, a discharge voltage of about 0.7 V was obtained per cell as in Example 1, but the effective reaction area of the electrode was reduced by about 2%. , Just that much Power has dropped.
- Example 3 In a continuous power generation test of PEFC using this electrolyte membrane-electrode assembly, a discharge voltage of about 0.7 V was obtained per cell as in Example 1, but the effective reaction area of the electrode was reduced by about 2%. , Just that much Power has dropped.
- FIG. 7 schematically illustrates a manufacturing process of the electrolyte membrane-electrode assembly for a fuel cell in the present example.
- a catalyst layer 103 carbon powder supporting a platinum catalyst in an amount of 10 to 30 Wt% was placed on N-butyl acetate and the weight ratio of the platinum and N-butyl acetate was 1: 120. And a dispersion of a platinum catalyst was obtained. While stirring the above dispersion with a magnetic stirrer, an ethyl alcohol solution of a polymer electrolyte was dropped until the above-mentioned platinum amount and polymer electrolyte mass became 1: 2, and then a paste was formed using an ultrasonic disperser. .
- a polymer electrolyte ethyl alcohol solution a Flemion FSS-1 solution manufactured by Asahi Glass Co., Ltd. was used.
- the catalyst paste is prepared by welding 20 to 60 Wt% of tetrafluoroethylene-hexafluoropropylene copolymer as a support 104 in advance. After coating on one side of carbon paper of mmX200 mm, it was dried at 50 to 60 ° C. to obtain a gas diffusion electrode. The thickness of the catalyst layer 103 thus formed was 30 to 40 °.
- the coating layer 102 formed on the catalyst layer 103 can be eliminated, and as shown in FIG. 7D, the gas in which the polymer electrolyte membrane 101 comes in contact with the catalyst layer 103 A diffusion electrode was obtained.
- the thickness of the polymer electrolyte membrane 101 was 5 to 20, and a polymer electrolyte membrane layer having a uniform thickness without infiltration into the catalyst layer was obtained.
- a gas diffusion electrode with a polymer electrolyte layer with a thickness of 1 2 am and a gas diffusion electrode with only a catalyst layer formed as described above were sandwiched with the catalyst layer facing inward, and a hot press machine was used. while applying pressure to 5 kgf / cm 2 Te
- the support 104 is not necessarily made of carbon paper, but may be made of polypropylene (PP) or polyethylene terephthalate.
- a polymer sheet such as (PET) may be used.
- carbon paper may be bonded after peeling. Comparative Example 2
- FIG. 10 schematically shows a manufacturing process of an electrolyte membrane-electrode assembly for a fuel cell in this comparative example.
- Gas diffusion electrodes 146 and 147 were obtained in the same manner as in Example 3 until the catalyst layers 143 and 145 were formed. Subsequently, the gas diffusion electrodes 1 4 6 and 1 4 7 are connected to the catalyst layer 1 4 3 and
- Flemion SH50 thickness: 50 im
- 50 im a polymer electrolyte membrane manufactured by Asahi Glass Co., Ltd.
- Example 3 The voltage at 0.7 A / cm 2 at 75 ° C. was measured using this conjugate in the same manner as in Example 3, and it was 0.55 V. That is, the obtained output power was 0.385 W / cm 2 , and the output was lower than that of Example 3. This is due to the internal resistance of the polymer electrolyte membrane, and a large film thickness causes a large voltage drop. Comparative Example 3
- the polymer electrolyte solution was directly applied to the catalyst layer 103 by the one-mouth method.
- Other conditions were the same as in Example 3 to produce a gas diffusion electrode.
- FIG. 8 schematically shows a manufacturing process of the electrolyte membrane-electrode assembly for a fuel cell in this example.
- a gas diffusion electrode with a catalyst layer 103 was obtained in the same manner as in Example 3.
- a 1% aqueous solution of hydroxypropylmethylcellulose (Shin 60 SH400 (manufactured by Etsu Chemical Co., Ltd.) was dropped on a glass plate by a casting method and developed, and then dried to obtain a film 122.
- this film with a polymer electrolyte layer was bonded to the gas diffusion electrode with the catalyst layer 103 prepared earlier, and dried at 200 ° C. using a dryer. Baking for 30 minutes.
- the film 122 can be eliminated, and as shown in FIG. 8 (c), the polymer electrolyte membrane 101 comes into contact with the catalyst layer 103 in the gas diffusion electrode. Obtained.
- the gas diffusion electrode with a polymer electrolyte layer produced as described above and the gas diffusion electrode having only the catalyst layer 103 were sandwiched with the catalyst layer facing inward as in Example 3, and hot-pressed. The temperature was raised to 150 ° C. while pressurizing to 5 kgf Zcm 2 using a machine, and then heated to 150 ° C., followed by hot pressing at 50 kgf / cm 2 .
- Example 5 When the voltage at 0.7 A / cm 2 at 75 ° C. was measured using this joined body, 0.69 V was obtained. That is, the output power was 0.48 WZ cm 2 , and a high output was obtained as in Example 3.
- Example 5 When the voltage at 0.7 A / cm 2 at 75 ° C. was measured using this joined body, 0.69 V was obtained. That is, the output power was 0.48 WZ cm 2 , and a high output was obtained as in Example 3.
- Example 5 Example 5
- FIG. 9 schematically shows a production process of the electrolyte membrane-electrode assembly for a fuel cell in this example.
- a gas diffusion electrode with a catalyst layer 103 was produced in the same manner as in Example 3. Next, this gas diffusion electrode with a catalyst layer was placed on a 50 ° C. hot plate, and a polymer electrolyte: Flemion was placed on the catalyst layer of the gas diffusion electrode. An 8 wt% solution of FSS-1 in ethyl alcohol was spray-coated with a spray nozzle 105. First, 5 cc of the above Flemion FSS_1 solution is sprayed onto the catalyst layer of the gas diffusion electrode from a distance of 80 cm or more, and while the ethyl alcohol, which is the solvent, is volatilized while descending, very little of the catalyst layer is sprayed. A gelling layer was deposited on the surface. Next, on top of this, Flemion FSS—
- the gas diffusion electrode with a polymer electrolyte layer produced as described above and the gas diffusion electrode with only the catalyst layer 103 were sandwiched in such a manner that the catalyst layers face inward as in Example 3, and a hot press machine was used.
- the temperature was raised to 150 ° C. while pressurizing to 5 kgf / cm 2 with the use of, and after the temperature was raised to 150 ° C., hot pressing was performed at 50 kgi Zcm 2 .
- hexamethylenediamine was mixed with the catalyst mixture, and the mixture was ultrasonically dispersed for 1 hour to obtain a catalyst paste.
- the catalyst paste was applied to a Toray Co., Ltd. boiler substrate, which was immersed in a fluororesin dispersion liquid (Daikin Industries, Ltd. ND-1) and baked at 300 ° C. 30 m was applied.
- the above-mentioned electrodes were placed on both sides of a polymer electrolyte membrane having a film thickness of 50 m (Flemion SH50 manufactured by Asahi Glass Co., Ltd.) at a temperature of 120 to 140 ° C and a temperature of 50 to 70 ° C. by applying a pressure of k GZC m 2 relieved Topuresu 1 0 minutes to prepare an electrolyte membrane first electrode assembly.
- a polymer electrolyte membrane having a film thickness of 50 m Femion SH50 manufactured by Asahi Glass Co., Ltd.
- This electrolyte membrane-electrode assembly is sandwiched between separators, assembled into a single cell, battery temperature 75 ° C, hydrogen dew point 70 ° C, air dew point 65, hydrogen utilization 70%, oxygen utilization 40% %, The current density was 0.7 A / cm 2 for 250 hours, but the voltage dropped from the initial 0.65 V to 0.03 V.
- Reference example 2
- the catalyst paste was applied to a carbon paper substrate manufactured by Toray Industries Co., Ltd., which was immersed in a fluororesin dispersion liquid (Daikin Industries Co., Ltd. ND-1) and then fired at 300 ° C. I wore it.
- a fluororesin dispersion liquid (Daikin Industries Co., Ltd. ND-1)
- Electrodes were placed on both sides of a polymer electrolyte membrane having a thickness of 50 (Flemion SH50 manufactured by Asahi Glass Co., Ltd.) at a temperature of 120 to 140 ° C and a temperature of 50 to 70 ° C. A pressure of KGZ cm 2 was applied and hot pressed for 10 minutes to produce an electrolyte membrane-electrode assembly.
- a polymer electrolyte membrane having a thickness of 50 (Flemion SH50 manufactured by Asahi Glass Co., Ltd.) at a temperature of 120 to 140 ° C and a temperature of 50 to 70 ° C.
- a pressure of KGZ cm 2 was applied and hot pressed for 10 minutes to produce an electrolyte membrane-electrode assembly.
- the above electrodes were placed on both sides of a polymer electrolyte membrane having a thickness of 50 m (F1 emion SH50 manufactured by Asahi Glass Co., Ltd.) at a temperature of 120 to 140 ° C, 50 to 70 ° C. A pressure of KGZ cm 2 was applied and hot pressed for 10 minutes to produce an electrolyte membrane-electrode assembly.
- a polymer electrolyte membrane having a thickness of 50 m F1 emion SH50 manufactured by Asahi Glass Co., Ltd.
- a single cell was obtained by sandwiching the electrolyte membrane-electrode assembly between separators and operated for 250 hours under the same conditions as in Reference Example 1. The voltage dropped from the initial 0.66 V to 0. 04 V.
- Reference example 4
- Polymer electrolyte (F1 emion manufactured by Asahi Glass Co., Ltd.) 40 ml of a 7% by weight ethanol solution was mixed with 0.05 g of hexamethylenediamine, stirred with ultrasonic waves, and then 12 cm in diameter. After drying at room temperature all day and night, it was dried at 130 ° C. for 2 hours to obtain a polymer electrolyte cast membrane having a thickness of 50.
- An electrolyte membrane-electrode assembly was produced by sandwiching this with a catalyst paper with a catalyst layer produced in exactly the same manner as in Comparative Example 1 to obtain a unit cell.
- This electrolyte membrane-electrode assembly was sandwiched between separators, assembled into a single cell, and operated for 250 hours under the same conditions as in Reference Example 1. The voltage dropped from the initial 0.63 V to 0.0. 5 V.
- the catalyst paste was applied on the carbon paper substrate to prepare the gas diffusion electrode, but the present invention is characterized by the composition of the catalyst layer and the Z or polymer electrolyte membrane.
- Other manufacturing methods for example, a catalyst paste obtained by dispersing platinum-supported carbon fine powder and a polymer electrolyte in ethanol
- a similar effect can be obtained by once applying a film such as polypropylene or Teflon and then thermally transferring it to a polymer electrolyte membrane to produce an electrolyte membrane-electrode assembly, or by directly applying a catalyst paste to the polymer electrolyte membrane. Needless to say.
- a highly reliable polymer electrolyte fuel cell having low internal resistance, high output, high efficiency, and high reliability can be provided.
- a perfluorosulfonic acid ionomer having high proton conductivity and excellent performance can be used, and a thin electrolyte membrane can be formed on the catalyst layer. It is possible to obtain a high-output electrolyte membrane-one-electrode assembly and PEFC suitable for low-humidification or non-humidification operation.
- an electrolyte membrane-electrode assembly that uses a polymer electrolyte having high proton conductivity, is excellent in durability, and exhibits high performance, and a polymer electrolyte type configured using the same A fuel cell can be obtained.
- the electrolyte membrane-electrode assembly obtained by the method for producing an electrolyte membrane-electrode assembly for a polymer electrolyte fuel cell according to the present invention is separated into a separator, a current collector, an end plate, a fastening rod, and a manifold according to a conventional method.
- a polymer electrolyte fuel cell having excellent cell characteristics can be obtained.
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02715767A EP1278260A4 (en) | 2001-01-19 | 2002-01-16 | METHOD FOR PRODUCING CONNECTED FUEL CELL ELECTROLYTE FILM ELECTRODES |
US10/240,433 US6977234B2 (en) | 2001-01-19 | 2002-01-16 | Method for manufacturing fuel cell electrolyte film-electrode bond |
US12/006,678 USRE41651E1 (en) | 2001-01-19 | 2002-01-16 | Method for manufacturing fuel cell electrolyte film-electrode bond |
CNB028007484A CN100338805C (zh) | 2001-01-19 | 2002-01-16 | 燃料电池用电解质膜-电极接合体的制造方法 |
Applications Claiming Priority (6)
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JP2001012338A JP2002216789A (ja) | 2001-01-19 | 2001-01-19 | 高分子電解質型燃料電池の製造方法 |
JP2001-012338 | 2001-01-19 | ||
JP2001-045572 | 2001-02-21 | ||
JP2001045572A JP2002246040A (ja) | 2001-02-21 | 2001-02-21 | 高分子電解質型燃料電池用膜・電極接合体の製造方法 |
JP2001-045615 | 2001-02-21 | ||
JP2001045615A JP5021864B2 (ja) | 2001-02-21 | 2001-02-21 | 固体高分子電解質型燃料電池用膜・電極接合体および固体高分子電解質膜 |
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WO2002058178A1 true WO2002058178A1 (fr) | 2002-07-25 |
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PCT/JP2002/000257 WO2002058178A1 (fr) | 2001-01-19 | 2002-01-16 | Procede de fabrication d'une liaison film electrolytique-electrode de pile a combustible |
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Country | Link |
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US (2) | US6977234B2 (ja) |
EP (2) | EP2009720B1 (ja) |
KR (1) | KR100531607B1 (ja) |
CN (1) | CN100338805C (ja) |
DE (1) | DE60238802D1 (ja) |
WO (1) | WO2002058178A1 (ja) |
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- 2002-01-16 EP EP02715767A patent/EP1278260A4/en not_active Withdrawn
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WO2003036748A2 (en) * | 2001-10-24 | 2003-05-01 | E.I. Du Pont De Nemours And Company | Continuous production of catalyst coated membranes |
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US7316794B2 (en) | 2001-10-24 | 2008-01-08 | E.I. Du Pont De Nemours And Company | Continuous production of catalyst coated membranes |
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WO2005000949A1 (ja) * | 2003-06-27 | 2005-01-06 | Asahi Kasei Chemicals Corporation | 高耐久性を有する高分子電解質膜およびその製造方法 |
GB2421505A (en) * | 2003-06-27 | 2006-06-28 | Asahi Kasei Chemicals Corp | Polymer electrolyte membrane having high durability and method for producing same |
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US8026015B2 (en) * | 2003-09-04 | 2011-09-27 | Daimler Ag | Membrane electrode assembly for a fuel cell |
US20100291415A1 (en) * | 2004-07-15 | 2010-11-18 | Johna Leddy | Methods for increasing carbon monoxide tolerance in fuel cells |
Also Published As
Publication number | Publication date |
---|---|
CN100338805C (zh) | 2007-09-19 |
EP1278260A1 (en) | 2003-01-22 |
EP2009720A2 (en) | 2008-12-31 |
CN1459135A (zh) | 2003-11-26 |
EP2009720B1 (en) | 2010-12-29 |
USRE41651E1 (en) | 2010-09-07 |
US20030158273A1 (en) | 2003-08-21 |
DE60238802D1 (de) | 2011-02-10 |
EP1278260A4 (en) | 2007-08-01 |
KR20020084217A (ko) | 2002-11-04 |
EP2009720A3 (en) | 2009-01-07 |
KR100531607B1 (ko) | 2005-11-28 |
US6977234B2 (en) | 2005-12-20 |
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