WO2018172006A1 - Couche de diffusion de gaz pour pile à combustible et procédé de fabrication d'au moins une couche de diffusion de gaz - Google Patents

Couche de diffusion de gaz pour pile à combustible et procédé de fabrication d'au moins une couche de diffusion de gaz Download PDF

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Publication number
WO2018172006A1
WO2018172006A1 PCT/EP2018/054247 EP2018054247W WO2018172006A1 WO 2018172006 A1 WO2018172006 A1 WO 2018172006A1 EP 2018054247 W EP2018054247 W EP 2018054247W WO 2018172006 A1 WO2018172006 A1 WO 2018172006A1
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WO
WIPO (PCT)
Prior art keywords
gas diffusion
diffusion layer
textile
fuel cell
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2018/054247
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German (de)
English (en)
Inventor
Martin Koehne
Jan Hendrik OHS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2018172006A1 publication Critical patent/WO2018172006A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/023—Porous and characterised by the material
    • H01M8/0241—Composites
    • H01M8/0243—Composites in the form of mixtures
    • 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
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/023—Porous and characterised by the material
    • H01M8/0234—Carbonaceous material
    • 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
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/023—Porous and characterised by the material
    • H01M8/0241—Composites
    • 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
    • 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 invention relates to a gas diffusion layer for a fuel cell and a gas diffusion layer material. Likewise, the invention relates to an electrode for a fuel cell and a fuel cell. Furthermore, the invention relates to a production method for at least one gas diffusion layer
  • An electrode manufacturing method and a fuel cell manufacturing method An electrode manufacturing method and a fuel cell manufacturing method.
  • WO 02/056404 A1 describes a fuel cell which has a catalyst layer arranged adjacent to the electrolyte membrane on each side of an electrolyte membrane.
  • the fuel cell includes on each side of the electrolyte membrane each a gas diffusion layer adjacent to the respective catalyst layer, at least one of the gas diffusion layers comprising a fibrous carbon (carbon fibers).
  • Gas diffusion layers are framed by two bipolar plates.
  • the invention provides a gas diffusion layer for a fuel cell having the features of claim 1, a gas diffusion layer material having the features of claim 6, an electrode for a fuel cell having the features of claim 7, a fuel cell having the features of claim 10, a manufacturing method for at least one Gas diffusion layer with the features of claim 11, a manufacturing method for an electrode with the
  • gas diffusion layer used hereinafter can be a
  • Gas diffusion layer can be understood.
  • the use of the term "gas diffusion layer" is only intended to clarify that the
  • Gas diffusion layer / gas diffusion layer both as a "separate component" may be prepared as well as a part / layer of a fuel cell component may be formed.
  • the present invention provides for the use of both the hydrophobized first textile or nonwoven material and (simultaneously / additionally) the hydrophilized second textile or nonwoven material for each
  • At least one gas diffusion layer means for preventing a local water accumulation in the respective gas diffusion layer and for effecting a water and / or gas transport through the respective gas diffusion layer.
  • Gas flow as well as a water stream or steam stream (or a water vapor-containing gas stream) can be effected. This can be used to improve a gas supply and to improve a water supply or a water removal (in particular a chemically generated water in the respective fuel cell).
  • a water supply or a water removal in particular a chemically generated water in the respective fuel cell.
  • an undesired condensation of water vapor at / in the respective gas diffusion layer can be counteracted.
  • the water management improved in this way by the present invention increases the efficiency of a water management system according to the invention
  • Gas diffusion layer (or an electrode according to the invention) equipped fuel cell and additionally contributes to increasing a Haltbarkeil / life of the respective fuel cell.
  • the present invention thus also provides a greater incentive for the use of fuel cells and thus supports environmental protection. It is expressly understood that wherein the carbon of the first and / or second textile or nonwoven material is preferably made of
  • Carbon nanotube or a mixture of carbon nanotube and carbon graph consists. Such a material is particularly well suited for use in the gas diffusion layer.
  • Carbon surfaces of the hydrophobized first textile or nonwoven material fluorinated.
  • a first textile or nonwoven material which can also be described as a superhydrophobic material, a local one can be used in particular
  • Water accumulation in the gas diffusion layer can be prevented.
  • carbon surfaces of the hydrophilized second textile or nonwoven material have oxygen-containing groups.
  • the gas diffusion layer is usable in a fuel cell equipped with at least one catalyst and a bipolar plate such that a first surface of the gas diffusion layer contacts the catalyst and a second surface of the first surface facing away from the first surface
  • the at least one first gas diffusion portion and the at least one second gas diffusion portion may each extend from the first surface of the gas diffusion layer to the second surface of the gas diffusion layer.
  • Fuel cell is used, that a first surface of the gas diffusion layer contacts the catalyst and a first surface facing away from the second surface of the gas diffusion layer contacts the bipolar plate, the first gas diffusion portion adjacent to the first surface of the gas diffusion layer, while the second gas diffusion portion on one of the first surface away side of the first gas diffusion portion is located.
  • a configuration of the gas diffusion layer also brings about the advantages described in the preceding paragraph.
  • an electrode for a fuel cell having a corresponding gas diffusion layer and a catalyst layer disposed adjacent to the gas diffusion layer contributes to realizing the advantages described above.
  • the at least one first gas diffusion portion of the gas diffusion layer and the at least one second gas diffusion portion of the gas diffusion layer each extend from the catalyst layer to a surface of the gas diffusion layer facing away from the catalyst layer.
  • first gas diffusion portion may also adjoin the catalyst layer, while the second gas diffusion portion lies on a side of the first gas diffusion portion away from the catalyst layer.
  • a fuel cell having such a gas diffusion layer or corresponding electrode provides the advantages described above.
  • a corresponding manufacturing method for at least one gas diffusion layer brings about the advantages explained above. It should be noted that the manufacturing process according to the above-described
  • Embodiments of the gas diffusion layer can be further developed.
  • the first textile or nonwoven material by a
  • Plasma treatment using at least one fluorine-containing gas to be hydrophobized is inexpensive and can be carried out with relatively little effort and produces an advantageous
  • the second textile or nonwoven material may be hydrophilized by a plasma treatment using oxygen.
  • the plasma treatment described in this paragraph is inexpensive and with a
  • the manufacturing method for an electrode can be further developed in accordance with the above-explained embodiments of the gas diffusion layer and / or the electrode.
  • Gas diffusion layer, the electrode and / or the fuel cell can be further developed.
  • Fig. La and lb are schematic representations of a first embodiment of the
  • FIG. 1a shows a cross section through the gas diffusion layer, and FIG. 1b shows a plan view of the gas diffusion layer;
  • Fig. 2 is a schematic representation of a second embodiment of the
  • Fig. 3 is a schematic representation of a third embodiment of the
  • Fig. 4 is a schematic representation of a fourth embodiment of the
  • Fig. 5 is a schematic representation of a fifth embodiment of
  • Fig. 6 shows an embodiment of the electrode, or a so
  • Fig. La and lb show schematic representations of a first embodiment of the gas diffusion layer, wherein Fig. La is a cross section through the
  • Gas diffusion layer and Fig. Lb show a plan view of the gas diffusion layer.
  • the gas diffusion layer 10 shown schematically in FIGS. 1 a and 1 b has at least one first gas diffusion part region 12, which is formed at least partially from a first textile or nonwoven material of at least carbon.
  • Nonwoven material can be understood that the hydrophobized first textile or nonwoven material has a water contact angle (or water edge angle or water wetting angle) which is greater than a water contact angle (or water edge angle or water wetting angle) from
  • the water contact angle of the hydrophobized first textile or nonwoven material may be greater than 80 ° (degrees), preferably greater than 90 ° (degrees), more preferably greater than 100 ° (degrees), especially greater than 120 ° (degrees).
  • the at least one first gas diffusion subregion 12 itself formed at least partially from the hydrophobized first textile or nonwoven material is itself hydrophobic.
  • Gas diffusion portion 12 be superhydrophobic.
  • a water contact angle of the at least one gas diffusion portion 12 may be greater than 80 degrees, preferably greater than 90 degrees, preferably greater than 100 degrees, more preferably greater than 120 degrees.
  • the gas diffusion layer 10 also has at least one second gas diffusion portion 14, wherein the at least one second gas diffusion portion 14 is at least partially formed of a second textile or nonwoven material of at least carbon and the second textile or nonwoven material is hydrophilized ,
  • a water contact angle (or water contact angle or water wetting angle) of the hydrophilized second textile or nonwoven material is smaller than a water contact angle of "pure / non-hydrophilized" carbon hydrophilized second textile or nonwoven material is, for example, less than 50 ° (degrees), preferably less than 30 ° (degrees), preferably less than 10 ° (degrees), especially less than 5 ° (degrees).
  • Textile or nonwoven material formed second gas diffusion portion 14 is hydrophilic.
  • the at least one second gas diffusion portion 14 may in particular be superhydrophilic.
  • At least one second gas diffusion portion 14 greater than 130 ° (degrees), preferably greater than 150 ° (degrees), more preferably greater than 170 ° (degrees), in particular greater than 175 ° (degrees).
  • the at least one hydrophobic (or superhydrophobic) first gas diffusion portion 12 and the at least one hydrophilic (or superhydrophilic) second gas diffusion portion 14 may directly / directly adjoin one another.
  • three-dimensional "channels" may be formed in the gas diffusion layer 10. As will be explained in more detail below, this improves water management of the gas diffusion layer 10.
  • the gas diffusion layer 10 is in one with at least one
  • the at least one first extend
  • Gas diffusion portion 14 respectively from the first surface 10a of
  • Gas diffusion portion 12 and the at least one second Gas diffusion portion 14 thus each form a "hydrophobic or hydrophilic channel".
  • the gas diffusion layer 10 is exemplified on a cathode side for chemical reaction of
  • Oxygen with hydrogen formed PEM fuel cell (polymer electrolyte membrane fuel cell) used / deployed, with a (not outlined) membrane /
  • Electrolyte membrane on a side facing away from the gas diffusion layer 10 side of the catalyst 16 can be arranged / arranged.
  • Gas diffusion layer 10 having the at least one first gas diffusion portion 12 and the at least one second gas diffusion portion 14, each extending from the first surface 10 a to the second surface 10 b, the first surface 10 a of the gas diffusion layer 10, which is adjacent to the catalyst 16, both from the hydrophobized first textile or nonwoven material as well as from the hydrophilized second textile or nonwoven material.
  • the first surface 10 a of the gas diffusion layer 10 thus has at least one hydrophobized first partial surface and at least one hydrophilized second partial surface, wherein a sufficiently large first partial surface
  • Gas diffusion layer 10 are passed to the catalyst 16, as shown by an arrow 20 in Fig. La shown. A uniform distribution of the oxygen in the catalyst 16 is also ensured. Likewise is a
  • Gas diffusion layer 10 thus not only causes a good electrical contact with the catalyst 16 at its first surface 10a and a good electrical contact to the bipolar plate 18 at its second surface 10b, but also a reliable removal of excess product water through the gas diffusion layer 10 and a sufficient / uniform gas supply to the catalyst 16.
  • the gas diffusion layer 10 contributes to improving the efficiency of the fuel cell equipped therewith.
  • a durability of the fuel cell is increased by the advantageous embodiment of the gas diffusion layer 10, in particular by the prevention of local water accumulation in the gas diffusion layer 10. The water management of the gas diffusion layer 10 is therefore considerably improved.
  • the gas diffusion layer 10 has a plurality of first gas diffusion portions 12 and a plurality of second gas diffusion portions 14, each having a "strip-shaped" cross-section in a parallel to the first surface 10a and / or the second surface 10b ( Figure 1b shows a top view of the first surface 10a of the gas diffusion layer 10.)
  • the gas diffusion portions 12 and 14 may also each have one
  • gas diffusion portions 12 and 14 may also be formed concentrically (e.g., as circles, rectangles, squares, or ellipses). Also a "checkerboard" arrangement of the
  • Gas diffusion portions 12 and 14 is possible.
  • Fig. 2 shows a schematic representation of a second embodiment of the gas diffusion layer.
  • FIG. 2 The illustrated in Fig. 2 as a plan view of its first surface 10a
  • the gas diffusion layer 10 includes a plurality of first gas diffusion portions 12 and the (second) second gas diffusion portion 14 extending from the first surface 10 a to the second surface 10 b of FIG
  • Gas diffusion layer 10 extend.
  • the variety of first Gas diffusion portions 12 is embedded in the second gas diffusion portion 14.
  • the first gas diffusion subregions 12 each have a circular cross section in a cross-sectional plane aligned parallel to the first surface 10a and / or the second surface 10b. Instead of their circular cross section, the first
  • gas diffusion portions 12 also have an elliptical / oval, rectangular or polygonal cross-section in a parallel to the first surface 10a and / or the second surface 10b aligned cross-sectional plane.
  • the gas diffusion layer 10 of FIG. 2 has the features of the previously described embodiment.
  • the embodiment of Fig. 2 therefore causes the advantages already described above.
  • Fig. 3 shows a schematic representation of a third embodiment of the gas diffusion layer.
  • Gas diffusion layer 10 includes first gas diffusion portion 12 and a plurality of second gas diffusion portions 14 extending from first surface 10 a to second surface 10 b of gas diffusion layer 10, respectively, with second gas diffusion portions 14 embedded in first gas diffusion portion 12.
  • the second gas diffusion portions 14 in a parallel to the first
  • Cross-sectional plane each have a circular cross-section.
  • FIG. 4 shows a schematic representation of a fourth embodiment of the gas diffusion layer.
  • Gas diffusion layer 10 differs from that previously described
  • the second gas diffusion portions 14 in a parallel to the first surface 10 a and / or the second surface 10 b aligned cross-sectional plane have an elliptical / oval cross-section.
  • the second gas diffusion portions 14 may also have a rectangular or polygonal cross-section in a parallel to the first surface 10 a and / or the second surface 10 b aligned
  • All embodiments described above have hydrophobic (or superhydrophobic) and hydrophilic (or superhydrophilic) three-dimensional "channels" which extend perpendicular to the first surface 10 a and / or the second surface 10 b through the respective gas diffusion layer 10.
  • Water can be transported through the hydrophilic (or superhydrophilic) three-dimensional "channels."
  • the hydrophobic (or superhydrophobic) three-dimensional "channels" are optimized for transporting gas (e.g., oxygen).
  • Gas diffusion portions 12 and 14 provide that the gas transport and the water transport in opposite directions do not interfere with each other. As a result, a higher current density can be achieved during operation of a fuel cell equipped with the respective gas diffusion layer 10.
  • FIG. 5 shows a schematic representation of a fifth embodiment of the gas diffusion layer or of a fuel cell equipped therewith.
  • gas diffusion layer 10 is so in a equipped at least with the catalyst 16 and the bipolar plate 18 fuel cell
  • the (only) first gas diffusion portion 12 of the gas diffusion layer 10 adjoins the first surface 10a of the gas diffusion layer (direct / direct). you This can also be described by the fact that the first surface 10a of the gas diffusion layer (direct / direct).
  • Gas diffusion layer 10 is at least partially formed from the hydrophobized first textile or nonwoven material of the first gas diffusion portion 12.
  • the (single) second gas diffusion portion 14 lies on a side of the first side facing away from the first surface 10a
  • Catalyst 16 adjacent first surface 10a of the gas diffusion layer a water accumulation / water film formation on the first surface 10a can be prevented.
  • Gas diffusion portion 14 on a side facing away from the first surface 10 a side of the first gas diffusion portion 14 ensures that the catalyst 16 remains sufficiently humidified and a good
  • Gas diffusion portions 12 and 14 have even comparatively thin layer thicknesses.
  • Gas diffusion portion 14 may, for example, each have a layer thickness of 100 ⁇ (microns) perpendicular to the first surface 10a.
  • the gas diffusion layer 10 in addition to the gas diffusion subregions 12 and 14, also comprises at least one further gas diffusion subarea 28 a to 28 c, which in each case faces away from the second gas diffusion subarea 12
  • Gas diffusion portion 14 is arranged.
  • the at least one further gas diffusion subarea 28a to 28c preferably has at least one water contact angle which lies between a first water contact angle of the first gas diffusion subarea 12 and a second water contact angle of the second gas diffusion subarea 14. If the gas diffusion layer 10 has at least two further gas diffusion subareas 28a to 28c, the respective water contact angle preferably increases along a direction from the second gas diffusion subregion 14 to the second surface 10b of the gas diffusion layer 10.
  • the membrane 30 may be an electrolyte membrane, a proton conducting membrane, a
  • gas diffusion layers 10 are not limited to a cathode side of a fuel cell. Instead or in addition, the gas diffusion layers 10 can also be on an anode side of the respective
  • Fuel cell be used.
  • Fig. 6 shows an embodiment of the electrode, or a fuel cell equipped therewith.
  • the fuel cell schematically illustrated in FIG. 6 differs from that described above in that the gas diffusion layer 10 and the gas diffusion layer 10 are disposed adjacent to the gas diffusion layer 10
  • Catalyst / catalyst layer 16 are formed as a compact electrode 42. (A subdivision of the electrode 42 in the catalyst / catalyst layer 16 and arranged separately gas diffusion layer 10 is thus possible only by means of their destruction.) As (optional) development is in the electrode 42 of FIG. 6, the catalyst / catalyst layer 16 of a
  • the anode-side catalyst 34 and the anode-side gas diffusion layer 32 may be formed as a compact electrode.
  • the first gas diffusion portion 12 adjoins the catalyst / catalyst layer 16, while the second
  • Gas diffusion portion 14 on a side facing away from the catalyst / catalyst layer 16 side of the first gas diffusion portion 12 is located.
  • Gas diffusion layer 10 extend.
  • Gas diffusion sections 12 and 14 comprise knitted textiles (knits), knitted textiles (knits), woven textiles (fabrics), braided textiles (braids) and tufted textiles (curtain or velor) as the respective first / second textile or nonwoven material.
  • the Gas diffusion portions 12 and 14 also include wadding, felts, and / or nonwoven fabrics as the respective first / second textile or nonwoven material. Also a
  • Carbon fiber paper can be understood by the respective first textile or nonwoven material and / or second textile or nonwoven material.
  • the first textile or nonwoven material and / or the second textile or nonwoven material may consist of
  • Carbon nanotube fibers (as the respective carbon) may be formed.
  • Carbon structures and / or carbon nanotube fibers may e.g.
  • the materials listed here withstand even a permanent thermal load in air at at least 350 ° C and have good electrical conductivity (especially equal to that of copper), which increases the (electrical) efficiency of a fuel cell equipped therewith.
  • carbon surfaces of the hydrophobized first textile or nonwoven material are fluorinated.
  • the first textile or nonwoven material can also be hydrophobized by means of at least one hydrophobic polymer and / or by means of at least one hydrophobic resin. In contrast, that can
  • Fuel cell can be used, which e.g. a low-temperature fuel cell, a PEM fuel cell (PEMFC cell or polymer electrolyte membrane fuel cell), an AFC cell (alkaline fuel cell), a DM FC cell (direct methanol fuel cell) and / or a GAFC cell (phosphoric acid fuel cell) can be.
  • a low-temperature fuel cell e.g. a PEM fuel cell (PEMFC cell or polymer electrolyte membrane fuel cell), an AFC cell (alkaline fuel cell), a DM FC cell (direct methanol fuel cell) and / or a GAFC cell (phosphoric acid fuel cell) can be.
  • PEM fuel cell PEM fuel cell
  • AFC cell alkaline fuel cell
  • DM FC cell direct methanol fuel cell
  • GAFC cell phosphoric acid fuel cell
  • FIG. 7 shows a flowchart for explaining an embodiment of the manufacturing method for at least one gas diffusion layer.
  • the manufacturing method described below can also for
  • At least one first gas diffusion portion of the respective gas diffusion layer is at least partially formed of a first textile or nonwoven material of at least carbon.
  • the respective gas diffusion layer is in addition to its at least a first
  • Gas diffusion portion at least partially from a second textile or nonwoven material of at least carbon, which is or is hydrophilized, is formed, while the first textile or nonwoven material of the at least one first gas diffusion region is or is hydrophobized.
  • a shape and / or arrangement of the gas diffusion portion reference is made to the above-described embodiments of gas diffusion layers.
  • step S2 the first textile or
  • at least one fluorine-containing gas to be hydrophobized (or superhydrophobized).
  • argon (Ar) can be used as a carrier gas
  • tetrafluoromethane (CF 4 ) and / or fluorine (F 2) as the at least one fluorine-containing gas for fluorinating the
  • Carbon surfaces of the first textile or nonwoven material may be used.
  • a flow of the carrier gas argon and the at least one fluorine-containing gas tetrafluoromethane and / or fluorine is easily controllable.
  • a thickness of the deposited fluorine film may be in the range of 150 to 500 nm depending on the ratio of the gases and a polarization voltage.
  • the second textile or nonwoven material can be hydrophilized by a plasma treatment using oxygen.
  • hydrophobization or superhydrophobization
  • hydrophilization or superhydrophilization
  • a Tetra-30-LF-PC plasma chamber with a graphite target can be used.
  • Superhydrophilization or hydrophobing / superhydrophobing are also a hyperthermal atom beam or a chemical treatment.
  • an additional is arranged adjacent to the gas diffusion layer
  • the finished gas diffusion layer (or finished electrode) can then be used in a fuel cell.

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

Abstract

L'invention concerne une couche de diffusion de gaz (10) destinée à une pile à combustible. Au moins une première zone de diffusion de gaz (12) de la couche de diffusion de gaz (10) est formée au moins en partie d'une première matière textile ou non tissée constituée au moins de carbone et la couche de diffusion de gaz (10) comporte, en plus de l'au moins une première zone de diffusion de gaz (12), encore au moins une deuxième zone de diffusion de gaz (14). L'au moins une deuxième zone de diffusion de gaz (14) est formée au moins en partie d'une deuxième matière textile ou non tissée constituée au moins de carbone. De plus, la deuxième matière textile ou non tissée est hydrophilisée tandis que la première matière textile ou non tissée est hydrophobisée. De même, L'invention concerne une matière de couche de diffusion de gaz, une électrode destinée à une pile à combustible et une pile à combustible. En outre, l'invention concerne un procédé de fabrication d'au moins une couche de diffusion de gaz (10), un procédé de fabrication d'une électrode et un procédé de fabrication d'une pile à combustible.
PCT/EP2018/054247 2017-03-21 2018-02-21 Couche de diffusion de gaz pour pile à combustible et procédé de fabrication d'au moins une couche de diffusion de gaz Ceased WO2018172006A1 (fr)

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Application Number Priority Date Filing Date Title
DE102017204721.6 2017-03-21
DE102017204721.6A DE102017204721A1 (de) 2017-03-21 2017-03-21 Gasdiffusionslage für eine Brennstoffzelle und Herstellungsverfahren für zumindest eine Gasdiffusionslage

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002056404A1 (fr) 2001-01-16 2002-07-18 Showa Denko K. K. Composition catalytique pour pile, couche de diffusion gazeuse et pile a combustible comprenant cette composition
US20050233203A1 (en) * 2004-03-15 2005-10-20 Hampden-Smith Mark J Modified carbon products, their use in fluid/gas diffusion layers and similar devices and methods relating to the same
DE102008038202A1 (de) * 2007-08-21 2009-04-09 GM Global Technology Operations, Inc., Detroit PEM-Brennstoffzelle mit verbessertem Wassermanagement
US20090136789A1 (en) * 2007-10-31 2009-05-28 Pien Shyhing M Integrated Flow Field (IFF) Structure
US20160172692A1 (en) * 2013-07-17 2016-06-16 Temasek Polytechnic Diffusion medium for use in fuel cell, fuel cell and method of making the diffusion medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002056404A1 (fr) 2001-01-16 2002-07-18 Showa Denko K. K. Composition catalytique pour pile, couche de diffusion gazeuse et pile a combustible comprenant cette composition
US20050233203A1 (en) * 2004-03-15 2005-10-20 Hampden-Smith Mark J Modified carbon products, their use in fluid/gas diffusion layers and similar devices and methods relating to the same
DE102008038202A1 (de) * 2007-08-21 2009-04-09 GM Global Technology Operations, Inc., Detroit PEM-Brennstoffzelle mit verbessertem Wassermanagement
US20090136789A1 (en) * 2007-10-31 2009-05-28 Pien Shyhing M Integrated Flow Field (IFF) Structure
US20160172692A1 (en) * 2013-07-17 2016-06-16 Temasek Polytechnic Diffusion medium for use in fuel cell, fuel cell and method of making the diffusion medium

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