JP2008305673A - Fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell suppressing the deterioration of a membrane-electrode assembly caused by a substance eluted from a gas leak suppressing member. <P>SOLUTION: The fuel cell has: the membrane-electrode assembly; a pair of frames arranged through the membrane-electrode assembly; a pair of separators arranged at both outsides of the frame; and the gas leak suppressing member suppressing gas leak between the adjoined members, and the gas leak suppressing member is formed of a material the same as a material used for the membrane-electrode assembly. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to fuel cell technology.

  In general, a fuel cell includes a membrane-electrode assembly including a pair of electrodes (an anode and a cathode) disposed via an electrolyte membrane, a pair of frames disposed via a membrane-electrode assembly, A pair of fuel cell separators sandwiching both outer sides. At the time of power generation of the fuel cell, when the anode gas supplied to the anode electrode is hydrogen gas and the cathode gas supplied to the cathode electrode is oxygen gas, a reaction to form hydrogen ions and electrons is performed on the anode electrode side. Passes through the electrolyte membrane to the cathode electrode side, and electrons reach the cathode electrode through an external circuit. On the other hand, on the cathode side, hydrogen ions, electrons, and oxygen gas react to generate moisture, and energy is released.

  The fuel cell is provided with a gas leakage suppression member that suppresses gas leakage of the reaction gas (anode gas, cathode gas) between adjacent fuel cell members.

  For example, Patent Document 1 proposes a fuel cell in which a gas leakage suppression member is provided between an opening of a frame where a rib that forms a reaction gas flow path of a fuel cell separator is disposed and the rib.

  During power generation of the fuel cell, side reactions may occur in addition to the above reactions, and substances with strong oxidizing power such as hydrogen peroxide and OH radicals may be generated.

  When the gas leakage suppression member comes into contact with water (including hydrogen peroxide, OH radicals, etc.) generated during power generation of the fuel cell, the gas leakage suppression member and the water react to adversely affect the membrane-electrode assembly. The acting substance may be eluted from the gas leakage suppressing member. As an example, for example, when a silicon resin is used for the gas leakage suppression member, when the silicon resin reacts with water, the silicon substance is mainly eluted from the silicon resin. When the eluted silicon-based material adheres to the electrolyte membrane constituting the membrane-electrode assembly, deterioration such as expansion and solidification of the electrolyte membrane is caused. As a result, the power generation performance of the fuel cell may deteriorate.

International Publication No. 2006/0775786 Pamphlet

  The present invention is a fuel cell that suppresses deterioration of a membrane-electrode assembly due to a substance eluted from a gas leakage suppressing member.

  The present invention relates to a membrane-electrode assembly, a pair of frames disposed via the membrane-electrode assembly, a pair of fuel cell separators disposed on both outer sides of the frame, and gas leakage between adjacent members. The gas leakage suppressing member is a material used for the membrane-electrode assembly.

  In the fuel cell, it is preferable that the fuel cell separator has a rib that forms a reaction gas flow path, and the gas leakage suppression member is disposed between the rib and an adjacent member.

  Further, in the fuel cell, the frame has an opening in which a rib in which a reaction gas flow path of the fuel cell separator is formed is disposed, and the gas leakage suppressing member includes the rib and the opening. It is preferable to arrange | position between inner periphery.

  In the fuel cell, it is preferable that the gas leakage suppressing member does not substantially elute a substance that degrades the membrane-electrode assembly even when it reacts with water generated during power generation of the fuel cell.

  In the fuel cell, the gas leakage suppressing member is preferably composed of an electrolyte or a water repellent used in the membrane-electrode assembly.

  According to the present invention, a membrane-electrode assembly, a pair of frames disposed via the membrane-electrode assembly, a pair of fuel cell separators disposed on both outer sides of the frame, and gas leakage between adjacent members The gas-leakage suppression member is a fuel cell having a gas-leakage suppression member, and the material used in the membrane-electrode assembly is used for the gas-leakage suppression member, so that the membrane-electrode assembly is caused by the substance eluted from the gas leakage suppression member A fuel cell that suppresses deterioration can be provided.

  Embodiments of the present invention will be described below.

  FIG. 1 is a schematic cross-sectional view showing an example of the configuration of a fuel cell according to an embodiment of the present invention. As shown in FIG. 1, the fuel cell 1 includes a membrane-electrode assembly 10, a frame 12, an anode separator 14 and a cathode separator 16 as fuel cell separators, and joints 18a and 18b.

  The membrane-electrode assembly 10 includes an anode electrode catalyst layer 22 and a cathode electrode catalyst layer 24 that sandwich the electrolyte membrane 20, an anode electrode diffusion layer 26 that sandwiches both outer sides of the anode electrode catalyst layer 22 and the cathode electrode catalyst layer 24, and a cathode. The pole diffusion layer 28 is used.

  The anode electrode separator 14 and the cathode electrode separator 16 are disposed via the membrane-electrode assembly 10. The anode separator 14 has an anode gas passage 30 through which anode gas flows, and the cathode separator 16 has a cathode gas passage 32 through which cathode gas flows.

  FIG. 2A is a schematic plan view of an anode electrode separator used in this embodiment, and FIG. 2B is a schematic plan view of a cathode electrode separator used in this embodiment. As shown in FIGS. 2A and 2B, the anode separator 14 and the cathode separator 16 include a rib 34 that forms a reaction gas passage (an anode gas passage 30 and a cathode gas passage 32), and an anode. An anode gas supply manifold 36 a that supplies the anode gas to the gas flow path 30, an anode gas discharge manifold 36 b that discharges the anode gas from the anode gas flow path 30 to the outside, and a cathode gas that supplies the cathode gas to the cathode gas flow path 32. A supply manifold 38a, a cathode gas discharge manifold 38b for discharging the cathode gas from the cathode gas flow path 32 to the outside, and a refrigerant supply / discharge manifold 40 through which the refrigerant flows are provided.

  FIG. 3 is a schematic plan view of a frame used in this embodiment. As shown in FIG. 3, the frame 12 includes an opening 42, an anode gas supply manifold 36a, an anode gas discharge manifold 36b, a cathode, as in the fuel cell separator (the anode separator 14 and the cathode separator 16). A gas supply manifold 38a, a cathode gas discharge manifold 38b, and a refrigerant supply / discharge manifold 40 are provided.

  FIG. 4 is a schematic plan view showing a state in which the frame is arranged on the fuel cell separator. In FIG. 4, an example in which the frame 12 is disposed on the anode electrode separator 14 will be described. As shown in FIG. 4, the frame 12 is arranged on the anode electrode separator 14 so that the manifolds of the anode electrode separator 14 and the frame 12 overlap each other. In addition, the anode gas flow path 30 and the rib 34 of the anode separator 14 are disposed in the opening 42 of the frame 12.

  The flow of the reaction gas in the fuel cell 1 will be described with reference to FIG. As shown in FIG. 4, in the anode electrode separator 14, the anode gas is supplied from the anode gas supply manifold 36 a into the anode gas flow path 30. The supplied anode gas flows in the anode gas flow path 30 along the ribs 34 and is discharged to the outside from the anode gas discharge manifold 36b.

  However, a part of the anode gas supplied to the anode gas flow path 30 may not flow in the anode gas flow path 30 along the ribs 34, and gas leakage may occur so as to cross the ribs 34.

  FIG. 5 is a partially enlarged schematic view of a fuel cell separator showing an example of a state in which the gas leakage suppressing member according to the present embodiment is arranged in the dotted line frame X shown in FIG. 4. For example, when the fuel cell 1 is assembled, the size of the opening 42 and the length of the rib 34 are defined so that the frame 12 does not run on the rib 34 of the anode separator 14. There may be a gap between the inner periphery 42a and the rib 34 (specifically, the end 34a of the rib 34). In such a case, a part of the anode gas supplied to the anode gas flow path 30 is likely to leak from between the inner periphery 42a of the opening 42 and the end 34a of the rib 34 (arrow B shown in FIG. 5). The same applies to the cathode side.

  In the present embodiment, for example, as shown in FIG. 5, by providing a gas leakage suppression member 44 between the inner periphery 42 a of the opening 42 of the frame 12 and the end 34 a of the rib 34, the opening 42 of the frame 12 is provided. The reaction gas can be prevented from leaking from between the inner circumference 42 a of the steel plate and the end 34 a of the rib 34. The same applies to the cathode side.

  FIG. 6 is a partially enlarged schematic view of a fuel cell separator showing another example of the state in which the gas leakage suppressing member according to the present embodiment is arranged in the dotted line frame X shown in FIG. 4. As shown in FIG. 6, a part of the inner periphery 42 a of the opening 42 of the frame 12 is cut out, and a gas leakage suppression member 44 is provided between the inner periphery 42 a of the notched part and the end 34 a of the rib 34. Accordingly, it is possible to prevent the reaction gas from leaking from between the inner periphery 42a of the notched portion and the end 34a of the rib 34. The same applies to the cathode side.

  FIG. 7 is a partially enlarged schematic view of a fuel cell separator showing another example of a state in which the gas leakage suppressing member according to the present embodiment is arranged in the dotted line frame X shown in FIG. As shown in FIG. 7, the reactive gas sometimes leaks over the rib 34 of the anode separator 14 (arrow C shown in FIG. 7). This is because a gap may be formed between the top surface 34t of the rib 34 shown in FIG. 7 and the diffusion layer (anode pole diffusion layer 26 shown in FIG. 1) in contact with the top surface 34t. As shown in FIG. 7, by providing a gas leakage suppression member 44 on the top surface 34t of the rib 34 (that is, between the top surface 34t of the rib and the diffusion layer), gas leakage of the reaction gas over the rib 34 ( That is, reaction gas leakage from between the top surface 34t of the rib 34 and the diffusion layer can be suppressed. The same applies to the cathode side.

  The gas leakage suppression member 44 is for suppressing gas leakage between adjacent fuel cell members. Therefore, the arrangement is not limited to the above as long as it is disposed between the fuel cell members that cause gas leakage. For example, the joining portion 18 a provided between the frames 12 shown in FIG. 1 and the joining portion 18 b provided between the fuel cell separator (the anode electrode separator 14 and the cathode electrode separator 16) and the frame 12 include the gas leakage suppression member 44. It may be. Alternatively, it may be between the joint 18 a and the frame 12 and the membrane-electrode assembly 10, and between the joint 18 b and the fuel cell separator and the frame 12.

  However, the inner periphery 42a of the opening 42 of the frame 12 shown in FIGS. 5 and 6 (notched in FIG. 6) is that there are many opportunities to come into contact with water (including hydrogen peroxide and OH radicals) generated during power generation. Between the inner circumference 42a) of the portion and the end 34a of the rib 34, and on the top surface 34t of the rib 34 shown in FIG. 7 (that is, between the top surface 34t of the rib 34 and the diffusion layer) It is preferable that the gas leakage suppression member 44 is disposed between adjacent fuel cell members. Further, gas leakage between the rib 34 and the adjacent fuel cell member is likely to occur mainly between the inner periphery 42a of the opening 42 of the frame 12 and the end 34a of the rib 34 shown in FIG. Therefore, the gas leakage suppression member 44 is preferably provided between the inner periphery 42 a of the opening 42 of the frame 12 described above and the end 34 a of the rib 34.

  Next, the flow of water (including oxidants such as hydrogen peroxide and OH radicals) generated by power generation of the fuel cell 1 will be described with reference to FIGS. The water generated on the cathode electrode catalyst layer 24 shown in FIG. 1 by the power generation of the fuel cell 1 flows through the cathode electrode diffusion layer 28 through the cathode gas flow path 32 of the cathode electrode separator 16 and out of the fuel cell 1. Drained. Alternatively, the water generated on the cathode electrode catalyst layer 24 passes through the electrolyte membrane 20 and flows through the anode gas flow path 30 of the anode electrode separator 14 via the anode electrode catalyst layer 22 and the anode electrode diffusion layer 26, and the fuel cell. 1 Drained outside.

  For example, it is provided between the rib 34 shown in FIGS. 5 and 6 and the inner periphery 42a of the opening 42 of the frame 12, and on the top surface 34t (between the top surface 34t and the diffusion layer) of the rib 34 shown in FIG. The gas leakage suppression member 44 is often in contact with water (including hydrogen peroxide, OH radicals, etc.) passing through the reaction gas channel (the anode gas channel 30 and the cathode gas channel 32). In addition, the adjacent fuel cell members described above, for example, between the frames 12, between the frame 12 and the fuel cell separator, and the like may also come into contact with water generated during power generation of the fuel cell 1.

  For example, when a silicon-based resin is used as a material constituting a normal gas leakage suppression member, the above water (including hydrogen peroxide, OH radicals, etc.) reacts with the gas leakage suppression member to cause gas leakage. The silicon-based material is eluted from the suppressing member. If the eluted silicon-based material adheres to the electrolyte membrane constituting the membrane-electrode assembly, it may cause deterioration such as expansion and solidification of the electrolyte membrane, thereby reducing the power generation performance of the fuel cell.

  Therefore, in this embodiment, the gas leakage suppression member 44 is made of a material used for the membrane-electrode assembly 10 described later. When water (including hydrogen peroxide, OH radicals, etc.) generated by the power generation of the fuel cell 1 reacts with the gas leak suppressing member 44 composed of the material used for the membrane-electrode assembly 10, the gas leak suppressing member 44 The eluate is eluted. However, since the eluate is eluted from the material used for the membrane-electrode assembly 10, the substance that degrades the membrane-electrode assembly 10 is hardly contained. For example, a substance that causes deterioration such as expansion and solidification of the electrolyte membrane 20 due to adhesion of a silicon-based material to the electrolyte membrane 20 is hardly included. Hereinafter, the structural members and materials used of the membrane-electrode assembly 10 will be described.

  The anode electrode catalyst layer 22 and the cathode electrode catalyst layer 24 as constituent members of the membrane-electrode assembly 10 include, for example, an anode electrode diffusion layer 26 obtained by mixing carbon carrying a metal catalyst such as platinum or ruthenium with an electrolyte. Alternatively, it is formed by forming a film on the cathode electrode diffusion layer 28. The electrolyte used in the present embodiment has proton conductivity. For example, Nafion (registered trademark, manufactured by DuPont), Aciplex (registered trademark, manufactured by Asahi Kasei Co., Ltd.), Flemion (registered trademark, Asahi Glass) Perfluorocarbon sulfonic acid polymer, polytrifluorostyrene sulfonic acid polymer, perfluorosulfonic acid electrolyte, perfluorocarbon phosphonic acid polymer, trifluorostyrene sulfonic acid polymer, ethylene tetrafluoroethylene Fluorine electrolytes such as g-styrene sulfonic acid polymer, ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride-perfluorocarbon sulfonic acid polymer, polysulfone sulfonic acid, polyaryl ether ketone sulfone Acid, polybenzimidazole alkyl sulphonic acid, polybenzimidazole alkyl phosphonic acid, polystyrene sulfonic acid, polyether ether ketone sulfonic acid, hydrocarbon electrolytes such as polyphenylsulfone acid. The electrolyte used in the present embodiment is preferably one containing a fluorine atom because it is excellent in heat resistance, chemical stability, etc. Among them, Nafion (registered trademark, manufactured by DuPont), Aciplex (registered trademark, Asahi Kasei) Perfluorocarbon sulfonic acid polymers such as Flemion (registered trademark, manufactured by Asahi Glass Co., Ltd.) are preferred.

  Among the materials used for the anode electrode catalyst layer 22 and the cathode electrode catalyst layer 24, a mixture of the electrolyte, carbon carrying a metal catalyst, and an electrolyte constitutes the gas leakage suppressing member 44 of the present embodiment. It can be used as a material. For example, the gas leakage suppressing member 44 (for example, shown in FIG. 5) is formed by applying the electrolyte between the rib 34 and the opening 42 of the frame 12 and curing it.

  Moreover, when using the said electrolyte for the gas leak suppression member 44, you may add the following plasticizers. As the plasticizer, for example, aliphatic dicarboxylic acid ester compounds such as adipic acid esters, phosphoric acid ester compounds, and the like can be used. The adipate is not particularly limited, and for example, dimethyl adipate, diethyl adipate, dibutyl adipate, diisobutyl adipate, diisopropyl adipate, dioctyl adipate, diisononyl adipate, didecyl adipate, etc. are used. be able to. The phosphate ester is not particularly limited, and for example, triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, trioctyl phosphate, tributyl phosphate, and the like can be used.

  Examples of the electrolyte membrane 20 as a constituent member of the membrane-electrode assembly 10 include a membrane made of an electrolyte having proton conductivity. Examples of the electrolyte membrane 20 include various Nafion (DuPont registered trademark) manufactured by DuPont and perfluorosulfonic acid membranes typified by Flemion, ion exchange resin manufactured by Dow Chemical, and ethylene-tetrafluoroethylene copolymer. Fluoropolymer electrolyte membranes such as coalescence resin membranes, resin membranes based on trifluorostyrene, hydrocarbon resin membranes having sulfonic acid groups, etc. A polymer microporous membrane made of tetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) or the like is impregnated with a liquid electrolyte such as phosphoric acid or ionic liquid, and the porous material is filled with a proton conductive electrolyte And the like. The electrolyte used for the electrolyte membrane 20 and the electrolyte used for the anode electrode catalyst layer 22 and the cathode electrode catalyst layer 24 may be the same or different.

  The electrolyte used for the electrolyte membrane 20 can be used as a material constituting the gas leakage suppression member 44 as described above. Moreover, you may add the plasticizer etc. which were demonstrated above.

  The anode electrode diffusion layer 26 and the cathode electrode diffusion layer 28 as constituent members of the membrane-electrode assembly 10 are made of, for example, a porous conductive material such as carbon cloth. Further, in order to enhance the drainage of moisture in the anode electrode diffusion layer 26 and the cathode electrode diffusion layer 28, it is preferable that the porous conductive material contains a water repellent. The water repellent is a fluororesin such as polytetrafluoroethylene, polyvinylidene fluoride, polyhexafluoropropylene, tetrafluoroethylene-hexafluoropropylene copolymer (FEP), a polyolefin resin such as polypropylene or polyethylene, or the above. Examples of these resins include pastes containing carbon particles, carbon fibers, and the like.

  Of the materials used for the anode electrode diffusion layer 26 and the cathode electrode diffusion layer 28, the water repellent can be used as a material constituting the gas leakage suppressing member 44 of the present embodiment. Moreover, you may add the plasticizer demonstrated above.

  Thus, the gas leakage suppressing member 44 of the present embodiment that suppresses the gas leakage of the reaction gas and suppresses the deterioration of the membrane-electrode assembly 10 includes the above-described electrolyte, carbon carrying a metal catalyst, and an electrolyte. A material used for the membrane-electrode assembly 10 such as a mixed material or a water repellent can be used.

  Of the materials used for the membrane-electrode assembly 10, the material constituting the gas leakage suppressing member 44 of the present embodiment is preferably an electrolyte or a water repellent in terms of manufacturing cost, workability, and the like.

  The anode separator 14 and the cathode separator 16 used in this embodiment are made of a conductive material such as a metal plate or a carbon plate.

  The frame 12 used in this embodiment is for fixing the membrane-electrode assembly 10, and a resin plate such as polyethylene or polypropylene is used.

  The joint 18a used in the present embodiment seals the frames 12, and 18b seals the fuel cell separator (the anode electrode separator 14 and the cathode electrode separator 16) and the frame 12. As described above, the material constituting the joints 18a and 18b is preferably a material used for the membrane-electrode assembly 10, but it is not necessarily required to be a material used for the membrane-electrode assembly 10. In view of securing adhesiveness, a thermosetting resin such as an epoxy resin or a phenol resin may be used. Moreover, you may add the said plasticizer etc. to a thermosetting resin.

  As described above, in the fuel cell according to the present embodiment, the material used for the membrane-electrode assembly is used for the gas leakage suppression member that suppresses the gas leakage of the reaction gas between the adjacent fuel cell members. Even when water (including hydrogen peroxide, OH radicals, etc.) generated during power generation reacts with the gas leakage suppressing member, elution of a substance that degrades the membrane-electrode assembly can be suppressed. Therefore, it is possible to suppress a decrease in the performance of the membrane-electrode assembly and to suppress a decrease in the power generation performance of the fuel cell.

  Next, a method for forming the gas leakage suppression member will be described.

  For example, between the rib 34 of the fuel cell separator and the inner periphery 42a of the opening 42 of the frame 12 (the gas leakage suppression member 44 shown in FIGS. 5 and 6), the top surface 34t (see FIG. 5) of the rib 34 of the fuel cell separator. The above-described electrolyte, water repellent, and the like are disposed on the gas leakage suppression member 44) shown in Fig. 7 using an air spray gun, a dispenser, an applicator, screen printing, a roll coat, or the like.

  After disposing at the above location, the electrolyte, water repellent and the like are cured. The curing conditions are not particularly limited, but for example, a range of 80 ° C. to 150 ° C. and 5 minutes to 30 minutes is preferable. Thereby, for example, the gas leakage of the reaction gas from between the rib 34 and the inner periphery 42a of the opening 42 of the frame 12 and between the top surface 34t of the rib 34 and the diffusion layer is suppressed, and at the time of power generation of the fuel cell Even if it reacts with the generated water (including hydrogen peroxide, OH radicals, etc.), the gas leakage suppressing member 44 is formed in which a substance that degrades the membrane-electrode assembly 10 is hardly eluted.

  As described above, the gas leakage suppression member formed by disposing the electrolyte, the water repellent, etc. between the rib end portions of the fuel cell separator and the top surface of the rib and curing the membrane-electrode assembly Almost no substance that degrades is eluted. Therefore, it is possible to suppress a decrease in the performance of the membrane-electrode assembly and to suppress a decrease in the power generation performance of the fuel cell.

  The fuel cell according to the present embodiment can be used as, for example, a small power source for mobile devices such as a mobile phone and a portable personal computer, a power source for automobiles, and a household power source.

1 is a schematic cross-sectional view showing an example of a configuration of a fuel cell according to an embodiment of the present invention. It is a model top view of the separator for fuel cells used for this embodiment. It is a model top view of the flame | frame used for this embodiment. It is a schematic plan view which shows the state which has arrange | positioned the flame | frame on the separator for fuel cells. FIG. 5 is a partially enlarged schematic view of a fuel cell separator showing an example of a state in which a gas leakage suppression member according to the present embodiment is arranged in a dotted line frame X shown in FIG. 4. FIG. 5 is a partially enlarged schematic view of a fuel cell separator showing another example of a state in which the gas leakage suppression member according to the present embodiment is arranged in the dotted line frame X shown in FIG. 4. FIG. 5 is a partially enlarged schematic view of a fuel cell separator showing another example of a state in which the gas leakage suppression member according to the present embodiment is arranged in the dotted line frame X shown in FIG. 4.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Fuel cell, 10 Membrane-electrode assembly, 12 Frame, 14 Anode electrode separator, 16 Cathode electrode separator, 18a, 18b Junction part, 20 Electrolyte membrane, 22 Anode electrode catalyst layer, 24 Cathode electrode catalyst layer, 26 Anode electrode diffusion layer , 28 Cathode pole diffusion layer, 30 Anode gas flow path, 30 Anode gas flow path, 32 Cathode gas flow path, 34 Rib, 34a End, 34t Top surface, 36a Anode gas supply manifold, 36b Anode gas discharge manifold, 38a Cathode Gas supply manifold, 38b Cathode gas discharge manifold, 40 Refrigerant supply / discharge manifold, 42 Opening, 42a Inner circumference, 44 Gas leakage suppression member.

Claims (5)

Membrane-electrode assembly, a pair of frames disposed via the membrane-electrode assembly, a pair of fuel cell separators disposed on both outer sides of the frame, and a gas that suppresses gas leakage between adjacent members A fuel cell having a leakage suppression member,
The fuel cell, wherein the gas leakage suppressing member is a material used for the membrane-electrode assembly. The fuel cell according to claim 1, wherein the fuel cell separator has a rib that forms a reaction gas flow path,
The fuel cell according to claim 1, wherein the gas leakage suppression member is disposed between the rib and an adjacent member. The fuel cell according to claim 1 or 2, wherein the frame has an opening in which a rib in which a reaction gas flow path of the fuel cell separator is formed is disposed.
The fuel cell according to claim 1, wherein the gas leakage suppression member is disposed between the rib and the inner periphery of the opening.   4. The fuel cell according to claim 1, wherein the gas leakage suppression member is a substance that degrades the membrane-electrode assembly even if it reacts with water generated during power generation of the fuel cell. 5. A fuel cell characterized in that it hardly elutes.   5. The fuel cell according to claim 1, wherein the gas leakage suppression member is composed of an electrolyte or a water repellent used in the membrane-electrode assembly. battery.

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