Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
  • H01M4/88—Processes of manufacture
  • H01M4/8875—Methods for shaping the electrode into free-standing bodies, like sheets, films or grids, e.g. moulding, hot-pressing, casting without support, extrusion without support
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
  • H01M4/88—Processes of manufacture
  • H01M4/8803—Supports for the deposition of the catalytic active composition
  • H01M4/8814—Temporary supports, e.g. decal
• • 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
• • 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 transfer sheet, a transfer method, and a method for producing a membrane electrode assembly.
• the membrane electrode assembly used for polymer electrolyte fuel cells has a structure in which a pair of electrodes are arranged on both sides of the electrolyte membrane.
• the electrode contains a catalyst layer that promotes the chemical reaction of the fuel gas.
• a resin film is used as the base material.
• the resin film has been improved by adjusting the physical properties or forming a release layer (see, for example, Patent Document 2).
• Patent Document 1 Japanese Patent Application Laid-Open No. 2019-179625
• Patent Document 2 Japanese Patent Application Laid-Open No. 2017-17767 9 [Overview of the Invention]
• an appropriate resin film is selected as the base material from the viewpoint of the formability of the catalyst layer, the peelability of the base material, etc. Even in that case, the peelability of the base film was insufficient, and defects such as cracks and holes may occur in the catalyst layer.
• An object of the present invention is to improve the recordability of a base sheet regardless of the type of the base sheet.
• the transfer system (58, 50) is a transfer system in which a transfer layer (52) is laminated on a base material (5 1). -The gas occlusion (60) is provided with a plurality of gas occlusions (60) on the surface or inside of the transfer layer (52), and the gas occlusion (60) is. The gas is stored, and when energy is applied, the stored gas is discharged.
• Another transfer method of the present invention is a transfer system in which a transfer layer (5 2) is laminated on a base material (5 1) (58, 50). This is a method of transferring the transfer layer (52) from the transfer layer to the transfer target by bringing the transfer sheet (58, 50 ⁇ ) into contact with the transfer target. A step of transferring the layer (5 2) and a step of peeling the base material (51) from the transferred object are included, and the transfer sheet (58,
• 50 ⁇ is provided with a plurality of gas occlusion bodies (60) for storing gas on the surface or inside of the transfer layer (52), and before or after peeling of the base material (51). It further includes a step of imparting energy to the gas storage body (60) and releasing the gas from the gas storage body (60).
• the electrode (2) including the catalyst layer (2 1) and the electrode (2) are arranged on both sides.
• the transfer sheet (58, 50) which includes a step of separating (5 1) from the catalyst layer (2 1).
• ⁇ 2021/171114 ⁇ (: 17132021/050890 is equipped with a plurality of gas occlusions (60) for storing gas on the surface or inside of the catalyst layer (2 1), and the base material sheet (5 1).
• the step of imparting energy to the gas storage body (60) and releasing the gas from the gas storage body (60) is further included.
• the peelability of the base material can be improved regardless of the type of the base material.
• FIG. 1 is a cross-sectional view showing the structure of the transfer sheet of the present embodiment.
• FIG. 2 is a cross-sectional view showing the configuration of a fuel cell.
• FIG. 3 is a flow chart showing a treatment procedure in which a catalyst layer is provided on an electrolyte membrane.
• FIG. 4 is a partial cross-sectional view showing a transfer sheet brought into contact with an electrolyte membrane.
• FIG. 5 is a partial cross-sectional view showing a base material peeling from an electrolyte membrane.
• FIG. 6 is a cross-sectional view showing the configuration of a transfer sheet of another embodiment.
• FIG. 1 shows a configuration example of a transcription sheet 50 according to an embodiment of the present invention.
• the transfer sheet 58 includes a base sheet 5 1 and a transfer layer 5 2 on the base sheet 5 1.
• the transfer layer 5 2 can be laminated on the transfer target by bringing the transfer layer 5 2 of the transfer series 5 8 into contact with the transfer target and transferring the transfer.
• the ⁇ direction represents the stacking direction.
• the X direction and the direction are the directions orthogonal to each other in the plane directly intersecting the ⁇ direction.
• ⁇ 02 821/171114 ⁇ (: 17132021/050890
• the base sheet 51 is preferably a tree-moon film because it is easy to match the shape of the transferred body.
• the material for the tree moon include fluorine-based resins such as polytetrafluore ⁇ ethylene (Yin) and polyvinylidene fluoride (b), thermoplastic resins, and the like.
• Thermoplastic resins include, for example, high-density polyethylene. , Polyethylene resin such as medium density polyethylene, propylene resin such as polypropylene, Polyethylene resin such as olefin copolymer; Polyethylene resin such as nylon-6; Polyethylene terephthalate, Polyethylene naphthalate-Um, aliphatic polyester, etc. Polyester-based resin; styrene-acry ⁇ Ethylene-based resin such as nitrile resin.
• the transfer layer 5 2 is laminated on the base material 5 1.
• the transfer layer 5 2 can be laminated by applying an ink containing the material of the transfer layer 5 2 on the base material 5 1 and drying it if necessary.
• the transfer sheet 50 is provided with a plurality of gas storage bodies 60 on the surface of the transfer layer 52.
• the gas occlusion body 60 stores gas and releases the stored gas when energy is applied. Energy for outgassing can be applied, for example, by irradiation with infrared rays, force ⁇ heat, or the like.
• the plurality of gas occlusion bodies 60 are placed by themselves by applying an ink containing the gas occlusion body 60 and a solvent onto the base sheet 51.
• the gas occlusion body 60 is a table formed by coating. It is placed in the surface layer 5 3.
• the ink can contain a pinda-resin.
• the ink can contain dispersed uniform U from the viewpoint of uniformly dispersing the gas occlusion body 60 in the in-plane direction (X — y plane) of the transfer layer 52.
• the thickness of the surface layer 5 3 can be such that it covers the gas occlusion body 60. With such a thickness, the gas occlusion body 60 is fixed to the surface of the base material 5 1 and does not interfere with the outgassing.
• the thickness of the surface layer 53 can be adjusted by the amount of ink applied (g / m 2 ), viscosity, and the like.
• the gas stored in the gas storage body 60 is not particularly limited, and may be, for example, air, hydrogen gas, nitrogen gas, oxygen gas, or the like. From the viewpoint of safety, an inert gas such as nitrogen gas can be used instead of the flammable gas.
• the gas stored in the gas occlusion body 60 can be selected according to the size of the small size of the glass beads, for example, in the case of a large number of glass beads. The smaller the size, the smaller the molecular weight of the gas that can be stored in the pores.
• the gas storage body 60 for example, a porous glass bead, a gas storage alloy, or the like can be used. Porous glass beads are preferable from the viewpoint of reducing the influence on physical properties such as conductivity of the transferred material, and borosilicate glass beads are more preferable from the viewpoint of pore formation.
• iron oxide (F e 3 0 4) Gad - flop been borosilicate glass Subizu is suitable for storage of hydrogen gas.
• glass frit such as borosilicate or alumina borosilicate is mixed with 0.1 to 10% by mass of iron oxide as required. It can be formed by heating it in a hydrogen atmosphere in a molten state at a temperature of 500-700 ° C, quenching it, and molding it into particles.
• Douglas B.Rapp, James E.Shelbv, "Photo-Induced Hydrogen outgassing of glass, Journal of Non Crystalline Solids", 349 (2004) pp.254 -259 Etc. can be referred to
• the size of the gas occlusion body 60 may be set according to the amount of gas stored, but in the case of a large number of glass beads, the particle size can be, for example, 0.1 to 100 pm. ..
• the blending amount of the gas occlusion body 60 may be determined according to the gas occlusion amount of the gas occlusion body 60 and the area of the transfer layer 52 2. Depending on the environmental conditions such as temperature or pressure, for example, if a 1 cm 3 gas occlusion body can occlude 100 times the volume of gas, a transfer layer with a unit area of 10 cm x 10 cm. If 1/10 or more gas occlusion bodies 60 are arranged with respect to 5 2, it can be sufficiently peeled off.
• the above transfer sheet can be used for manufacturing a membrane electrode assembly (MEA: Membrane Electrode Assembly) of a fuel cell.
• MEA Membrane Electrode Assembly
• FIG. 2 shows a configuration example of the fuel cell 10 as an embodiment.
• the fuel cell 10 includes ME A 3, a pair of separators 4, and a sub-gasket 5.
• M E A 3 includes an electrolyte membrane 1 and a pair of electrodes 2. Electrodes 2 and Separation-4 are laminated on both sides of the electrolyte membrane 1, respectively.
• the z direction represents the stacking direction.
• the X and y directions are the directions orthogonal to each other in the plane orthogonal to the z direction.
• the electrolyte membrane 1 is an ionic conductive polymer electrolyte membrane.
• Examples of the electrolyte membrane 1 include perfluo ⁇ sulfonic acid polymers such as Nafion (registered trademark) and Aquivion (registered trademark); ; Examples include aliphatic polymers such as polyvinyl sulfonic acid and polyvinyl phosphoric acid. ⁇ 2021/171114 ⁇ (: 17132021/050890
• the electrolyte membrane 1 may be a composite membrane in which a porous base material 13 is impregnated with a polymer electrolyte.
• the porous base material 13 is not particularly limited as long as it can support a polymer electrolyte, and a porous, woven fabric-like, non-woven fabric-like, or fibril-like film can be used.
• the material of the multi-material substrate 13 is not particularly limited, but the above-mentioned polymer electrolyte can be used from the viewpoint of enhancing ionic conductivity.
• the fluorine-based polymers polytetrafluo ⁇ ethylene, polytetrafluo ⁇ ethylene ku ⁇ ⁇ trifluo ⁇ ethylene copolymer, polyc ⁇ ⁇ trifluo ⁇ ethylene, etc. are excellent in strength and shape stability.
• one electrode 2 is an electrode and is also called a fuel electrode.
• the other electrode 2 is a cassette, also called an air electrode.
• fuel gas hydrogen gas is supplied to the anode and air containing oxygen gas is supplied to the cathode.
• Hydrogen gas (1 to 1 2 ) is supplied from the hydrogen gas (1 to 1 2 ), and electrons (61) and protons (1 to 1 +) are supplied from the hydrogen gas (1 to 1 2).
• oxygen gas ( ⁇ 2 ) is supplied, and oxygen ions ( ⁇ 2 — ) are supplied by electrons moving from an external circuit.
• Oxygen ions combine with up ⁇ tons that have moved from the electrolyte membrane 1 (2 1 to 1 +), and water (1 to 1 2 0).
• Electrode 2 includes a catalyst layer 21.
• the electrode 2 of the present embodiment further includes a gas diffusion layer 2 2 in order to improve the diffusibility of the fuel gas.
• the catalyst layer 2 1 promotes the reaction of hydrogen gas and oxygen gas by the catalyst.
• the catalyst layer 21 contains a catalyst, a carrier that carries a catalyst, and an ionomer that coats them.
• ⁇ 0 2021/171114 ⁇ (: 1713201/050890
• Examples of catalysts include platinum (ce), ruthenium (Ru), iridium (I "), rhodium (R h), paradium (), tungsten ( ⁇ 1 ⁇ )
• metals such as ⁇ , mixtures of these metals, alloys, etc. Among them, platinum, mixtures containing platinum, alloys, etc. are preferable from the viewpoints of catalytic activity, toxicity to carbon monoxide, heat resistance, and the like.
• Examples of the carrier include conductive porous metal compounds having pores such as mesoporous carbon and seblack. Mesoporous carbon is preferable from the viewpoint of good dispersibility, large surface area, and small particle growth at high temperature even when the amount of catalyst supported is large.
• a polymer electrolyte having ionic conductivity similar to that of the electrolyte membrane 1 can be used.
• the gas diffusion layer 2 2 can uniformly diffuse the supplied fuel gas into the catalyst layer 21.
• a force having conductivity, gas permeability and gas diffusivity-a porous fiber such as a bon fiber-a metal plate such as a foamed metal or an expanded metal can be used. can.
• Separator 4 is a plate with a plurality of ribs 4 on the surface, and is also called a pibo love rate. Each rib 4 is provided with a recess 4 3 on the surface of the separator 4. The recesses 4 3 form each of the fuel gas flows between the separator 4 and 1 ⁇ / 1. Each of these streams is also the amount of water discharged by the reaction of the fuel gas.
• the sub-gasket 5 is a film or plate provided on the edge 5 of the electrolyte membrane 1. Specifically, two frame-shaped sub-gaskets 5 are provided so as to sandwich the edge 5 of the electrolyte membrane 1 on the outer peripheral side of the hornworm medium layer 21. Such a sub-gasket 5 functions as a support for 1 ⁇ / 1 Mihachi 3 or a protective material for the edge 5. Also, the sub gas bucket
• the material of the sub-gasket 5 it is possible to use a tree having low conductivity.
• the material of the tree is not particularly limited, and for example, polypropylene rufide (5). ), Polypropylene with glass (10), Polystyrene (5), Silicone tree, Fluorine tree, etc.
• a catalyst layer 2 1 is laminated on the surfaces on both sides of the electrolyte membrane 1, and a gas diffusion layer sheet is placed on each catalyst layer 2 1 to form a gas diffusion layer 2 It can be manufactured by forming 2.
• a transfer sheet 5 8 can be used for laminating the hornworm medium layer 2 1.
• the catalyst layer 2 1 is formed on the base material 5 1 as the transfer layer 5 2 of the transfer sheet 58.
• FIG. 3 shows the processing procedure for laminating the catalyst layer 2 1 on the electrolyte membrane 1 using the transfer membrane 58.
• Fig. 4 and Fig. 5 show the catalyst layer 21 transferred to the electrolyte membrane 1.
• the ink for the surface layer 5 3 containing the gas occlusion body 6 0 is applied on the base material sheet 5 1 and the gas occlusion body 6 0 stores the gas. Is placed (step 5 1).
• the ink for the catalyst layer 2 1 is applied on the surface layer 5 3 to form the hornworm medium layer 2 1 (step 5 2).
• a transcription pattern of the hornworm medium layer 21 is obtained.
• the gas stored in the gas occlusion body (60) may be different between the anode side and the cathode side.
• a gas occlusion (60) that stores an inert gas such as nitrogen gas, which has little effect on the chemical reaction of the fuel gas, may be used.
• the transfer sheet 58 is then placed on the electrolyte membrane 1. As shown in Fig. 4, the catalyst layer 2 1 on the base sheet 5 1 comes into contact with the electrolyte membrane 1 (step 5 3). The transfer membrane 1 and the electrolyte membrane 1 are pressurized and heated by a hot press car, etc., and the catalyst layer 2 1 is transferred to the electrolyte membrane 1 (step 54).
• the surface of the transfer layer 5 2 (catalyst layer 2 1), that is, the transfer layer 5 2 (contact layer 2 1) and the base material 5
• a gas occlusion body 60 is placed between 1 and 1, and gas is released from the gas occlusion body 60 before or during the peeling of the base material 5 1. Since the transfer layer 5 2 (catalyst layer 2 1) and the base material sheet 5 1 are easily separated by the gas, the recordability of the base material sheet 5 1 can be improved regardless of the type of the base material sheet 5 1. Can be enhanced.
• the transfer sheet 58 is particularly suitable for the production of 1 ⁇ / 1 Mihachi 3.
• the gas occlusion body 60 may be arranged inside the transfer layer 52 as long as it does not interfere with the function of the transfer layer 52.
• FIG. 6 shows a configuration example of a transfer sheet 50 with a gas occlusion body 60 placed in the transfer layer 52.
• the gas occlusion body 60 is preferably placed on the base sheet 51 side by rooster.
• the gas from the gas occlusion body 60 is easily released to the base material 5 1 side, and the peelability is improved.
• the gas occlusion body 60 is placed on the base sheet 5 1 side. You can place the rooster yourself.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• Sustainable Energy (AREA)
• Fuel Cell (AREA)
• Inert Electrodes (AREA)
• Laminated Bodies (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

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Citations (2)

Family Cites Families (7)

• 2020
  • 2020-02-24 JP JP2020028905A patent/JP2021136074A/ja active Pending
• 2021
  • 2021-02-04 US US17/801,316 patent/US12609325B2/en active Active
  • 2021-02-04 CN CN202180016492.1A patent/CN115104206A/zh active Pending
  • 2021-02-04 WO PCT/IB2021/050890 patent/WO2021171114A1/ja not_active Ceased
  • 2021-02-04 JP JP2022502331A patent/JP7403625B2/ja active Active
  • 2021-02-04 DE DE112021001242.8T patent/DE112021001242T5/de active Pending

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