JP2010192160A - Solid alkaline fuel cell, and electrolyte membrane with fixing member and electrode with fixing member for use in the solid alkaline fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid alkaline fuel cell improving positional accuracy. <P>SOLUTION: The solid alkaline fuel cell includes: an electrolyte membrane 3; a first fixing member 2 attached to the electrolyte membrane 3 and having an annular recessed part 22; a cathode electrode 5 laminated on an upper surface of the electrolyte membrane 3; a second fixing member 4 attached to the cathode electrode 5 and having an annular projecting part 42 to be engaged to the annular recessed part 22 of the first fixing member 2 when the cathode electrode 5 is laminated on the upper surface of the electrolyte membrane 3; an anode electrode 7 laminated on a lower surface of the electrolyte membrane 3; and a third fixing member 6 attached to the anode electrode 7 and having an annular projecting part 62 to be engaged to the annular recessed part 22 of the first fixing member 2 when the anode electrode 7 is laminated on the lower surface of the electrolyte membrane 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a solid alkaline fuel cell, and an electrolyte membrane with a fixing member and an electrode with a fixing member used for the same.

  Various studies have been made on polymer electrolyte fuel cells from the viewpoint of achieving weight reduction, higher power density, and the like than other fuel cells. In general, a polymer electrolyte fuel cell uses an ion conductive polymer electrolyte membrane as an electrolyte membrane, and a catalyst layer and an electrode base material are sequentially arranged on both sides of the membrane and further sandwiched between separators. is doing.

This polymer electrolyte fuel cell normally uses a cation conductive polymer electrolyte membrane that allows cations (H ⁺ ) to pass therethrough. However, in recent years, a solid alkaline fuel cell using an anion conductive polymer electrolyte membrane that allows anion (OH ⁻ ) to pass therethrough as a polymer electrolyte membrane (also called “anion conductive solid polymer fuel cell”). Has been proposed (Patent Document 1).

  As a method of assembling this solid alkaline fuel cell, in Cited Document 2, a frame is attached to each of the electrolyte membrane, the anode electrode, and the cathode electrode, and these frames are stacked and integrated into each frame by hot pressing. A method is disclosed.

JP 2006-244960 A Japanese Patent Laid-Open No. 02-278665

  In order to increase the power generation efficiency of the fuel cell, it is preferable to align the positions of the electrodes with the electrolyte membrane interposed therebetween. However, in the fuel cell assembly method as described above, the positions of the electrodes can be aligned. There is a problem that each electrode is displaced during hot pressing. Then, this invention makes it a subject to provide the solid alkaline fuel cell which can improve a positional accuracy.

  A solid alkaline fuel cell according to the present invention includes an electrolyte membrane, a first fixing member attached to the electrolyte membrane and having a fitted portion, a cathode electrode laminated on one surface of the electrolyte membrane, A second fixing member attached to the cathode electrode, and having a fitting portion that fits with a fitted portion of the first fixing member when the cathode electrode is laminated on one surface of the electrolyte membrane; An anode electrode laminated on the other surface of the electrolyte membrane, and a fitting portion of the first fixing member attached to the anode electrode when the anode electrode is laminated on the other surface of the electrolyte membrane; A third fixing member having a fitting portion to be fitted.

  According to this solid alkaline fuel cell, the second and third fixing members are fixed to the first fixing member by fitting the fitting portion to the fitted portion of the first fixing member. The first fixing member is always fixed at a fixed position. For this reason, the cathode electrode and the anode electrode to which the second fixing member and the third fixing member are attached are always laminated at a certain position with respect to the electrolyte membrane. As a result, the positional accuracy of the cathode electrode and the anode electrode with respect to the electrolyte membrane can be improved.

  The solid alkaline fuel cell can take various configurations.For example, the first fixing member is a frame having an opening at the center and is attached to the outer peripheral edge of the electrolyte membrane. It is preferable that an annular concave portion is formed on both surfaces as the fitted portion, and the second and third fixing members are formed as an annular convex portion that fits into the annular concave portion as the fitting portion. According to this configuration, the fuel gas or the oxidant gas supplied to one electrode can be prevented from leaking to the other electrode side by the annular convex portion and the annular concave portion that are fitted to each other, and the solid alkaline fuel The sealing property of the battery can be improved.

  The cathode electrode and the anode electrode have a porous body and a catalyst layer formed on one surface of the porous body, and are laminated on the electrolyte membrane so that the catalyst layer is in contact with the electrolyte membrane. At least one of the second and third fixing members has a top plate portion that is formed slightly larger than the cathode electrode or the anode electrode and joined to the other surface of the porous body, and the fitting portion is a top plate. It is preferable that a plurality of through-holes are formed in the top plate portion so that the other surface of the porous body is exposed. According to this configuration, it is possible to supply fuel gas and oxidant gas to each electrode through the through holes provided in the top plate portion, and to directly touch each electrode when handling the solid alkaline fuel cell. By doing so, it is possible to prevent breakage of each electrode.

  Moreover, it is preferable to further include a first current collector that is electrically connected to the cathode electrode and a second current collector that is electrically connected to the anode electrode.

  The first fixing member and the second fixing member airtightly cover the side surface of the cathode electrode when fitted together, and the first fixing member and the third fixing member are anodes when fitted together. It is preferable that the side surface of the electrode is airtightly covered. According to this configuration, the fuel gas and oxidant gas supplied to each electrode can be prevented from leaking to the outside.

  An electrolyte membrane with a fixing member according to the present invention is an electrolyte membrane with a fixing member for a solid alkaline fuel cell, in which an electrode with a fixing member having a fitting portion is laminated, and the electrolyte membrane and the electrolyte membrane And a fixing member having a fitted portion to be fitted to the fitting portion of the electrode with the fixing member.

  An electrode with a fixing member according to the present invention is an electrode with a fixing member for a solid alkaline fuel cell, which is laminated on an electrolyte membrane with a fixing member having a fitted portion, and is attached to the electrode. And a fixing member having a fitting portion to be fitted to the fitted portion of the electrolyte membrane with the fixing member.

  In addition, another solid alkaline fuel cell according to the present invention includes a membrane catalyst layer assembly in which catalyst layers are formed on both surfaces of an electrolyte membrane, and a membrane catalyst layer assembly that is attached to the membrane catalyst layer assembly and has a fitted portion. A cathode member porous body laminated on one surface of the membrane catalyst layer, and the cathode electrode porous body, and the cathode electrode porous body is attached to the membrane. A second fixing member having a fitting portion that fits with a fitted portion of the first fixing member when laminated on one surface of the catalyst layer assembly, and laminated on the other surface of the membrane catalyst layer When the anode electrode porous body is attached to the anode electrode porous body, and the anode electrode porous body is laminated on the other surface of the membrane catalyst layer assembly, the first electrode And a third fixing member having a fitting portion to be fitted to the fitted portion of the fixing member. It is.

  According to this solid alkaline fuel cell, the second and third fixing members are fixed to the first fixing member by fitting the fitting portion to the fitted portion of the first fixing member. The first fixing member is always fixed at a fixed position. For this reason, the porous for the cathode electrode and the porous for the anode electrode to which the second fixing member and the third fixing member are attached are compared with the membrane-catalyst layer assembly to which the first fixing member is attached. It is always laminated at a certain position. As a result, it is possible to improve the positional accuracy of the porous body for the cathode electrode and the porous body for the anode electrode with respect to the membrane catalyst layer assembly.

  ADVANTAGE OF THE INVENTION According to this invention, the solid alkaline fuel cell which can improve a positional accuracy can be provided.

FIG. 1 is a front sectional view showing an embodiment of a solid alkaline fuel cell according to the present invention. FIG. 2 is a front sectional view showing an embodiment of the electrolyte membrane with a fixing member according to the present invention. FIG. 3 is a plan view showing an embodiment of an electrolyte membrane with a fixing member according to the present invention. FIG. 4 is a front sectional view showing an embodiment of an electrode with a fixing member according to the present invention. FIG. 5 is a plan view showing an embodiment of an electrode with a fixing member according to the present invention. FIG. 6 is a bottom view showing an embodiment of an electrode with a fixing member according to the present invention. FIG. 7 is a front sectional view showing an embodiment of an electrode with a fixing member according to the present invention. FIG. 8 is a front sectional view showing an embodiment before assembly of the solid alkaline fuel cell according to the present invention. FIG. 9 is a front sectional view showing a method of using the solid alkaline fuel cell according to the present embodiment. FIG. 10 is a front sectional view showing another embodiment of the electrode with a fixing member according to the present invention. FIG. 11 is a front sectional view showing another embodiment before assembly of the solid alkaline fuel cell according to the present invention.

  Hereinafter, embodiments of a solid alkaline fuel cell according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a solid alkaline fuel cell 1 includes an electrolyte membrane 3 to which a first fixing member 2 is attached, a cathode electrode 5 to which a second fixing member 4 is attached, and a third fixing member. And an anode electrode 7 to which 6 is attached.

  As shown in FIG. 2 and FIG. 3, the electrolyte membrane 3 has a rectangular shape in plan view, and the thickness is appropriately determined in consideration of the kind of the porous body and the thickness of the catalyst layer described later. It is about 20-200 micrometers, Preferably it is about 25-75 micrometers. A first fixing member 2 is integrally attached to the outer peripheral edge of the electrolyte membrane 3. The first fixing member 2 has a substantially frame shape and has an opening 21 at the center, and an annular recess (fitting portion) 22 is formed on the upper surface and the lower surface.

  As shown in FIGS. 4 to 6, the cathode electrode 5 includes a porous body 51 having a rectangular shape in plan view and conductivity, and a catalyst layer 52 formed on the lower surface of the porous body 51. The thickness of the porous body 51 is preferably about 100 to 500 μm, and more preferably about 200 to 400 μm. The thickness of the catalyst layer 52 may be appropriately determined in consideration of the type of the porous body 51, the thickness of the electrolyte membrane 3, etc., but is usually about 10 μm to 200 μm, preferably about 10 μm to 100 μm, more preferably. Is preferably about 15 μm to 50 μm.

  Thus, the second fixing member 4 is attached to the cathode electrode 5 composed of the porous body 51 and the catalyst layer 52. The second fixing member 4 has a top plate portion 41 having a rectangular shape in plan view formed slightly larger than the porous body 51. The lower surface of the top plate portion 41, the upper surface of the porous body 51, and As a result of joining, the second fixing member 4 is attached to the cathode electrode 5. In addition, a plurality of through holes 43 are formed in the top plate portion 41, and an oxidant gas can be supplied to the cathode electrode 5 through the through holes 43. Although this through-hole 43 is not specifically limited, For example, it can be formed by a drill, a punch, a leather blade, a Thomson blade, laser processing etc. Further, the aperture ratio of the through-hole 43 (the sum of the opening area of the through-hole 43 formed in the portion corresponding to the cathode electrode 5 of the top plate portion 41 divided by the area of the cathode electrode 5) is particularly limited. Although it is not a thing, it is preferable to set it as 45 to 98%. An annular convex portion (fitting portion) 42 extending downward is formed on the outer peripheral edge of the top plate portion 41. By fitting the annular convex portion 42 and the annular concave portion 22 of the first fixing member 2 described above, the first fixing member 2 and the second fixing member 4 are integrated in an airtight manner. The width and depth of the annular convex portion 42 and the annular concave portion 22 are not particularly limited, but the width of the convex portion of the annular convex portion 42 is preferably 0.3 to 15 mm. The width is preferably 0.5-3 mm larger than the width of the convex portion of the annular convex portion 42. By forming the width of the annular recess 22 larger than the annular projection 42 by 0.5 mm or more, the annular projection 42 can be smoothly fitted into the annular recess 22, and the width of the annular recess 22 can be reduced to the annular projection. Confidentiality can be maintained sufficiently by not making it larger than the width of 42 by 3 mm or more. By setting the depth to 0.3 mm or more, confidentiality can be sufficiently maintained. Moreover, confidentiality can be raised by forming a nail | claw in a fitting part. In addition, it is preferable that the thickness of the top plate part 41 shall be about 0.5 mm-10 mm, and it is more preferable to set it as 1 mm-5 mm.

  As shown in FIG. 7, the anode electrode 7 has the same configuration as the cathode electrode 5, has a rectangular shape in plan view and has conductivity, and a catalyst layer formed on the upper surface of the porous body 71. 72. The thickness of the porous body 71 is about 200 μm to 2 mm, preferably about 300 to 600 μm. The preferable thickness range of the catalyst layer 72 is the same as that of the catalyst layer 52 of the cathode electrode 5. A third fixing member 6 is attached to the anode electrode 7. The third fixing member 6 also includes a top plate portion 61 in which a plurality of through holes 63 are formed, and an annular convex portion (fitting portion). 62 and has the same configuration as the second fixing member 4.

  Next, the material of each member constituting the solid alkaline fuel cell described above will be described.

  The electrolyte membrane 3 uses an anion conductive polymer electrolyte membrane. As the anion conductive polymer electrolyte membrane, for example, either a hydrocarbon type or a fluororesin type can be used. When the electrolyte membrane 3 is impregnated with a high concentration alkaline aqueous solution, it is preferable to use a fluororesin-based electrolyte membrane from the viewpoint of alkali resistance. In addition, anion conductivity can be improved by using an alkali-resistant fluorine resin electrolyte membrane. When using a low concentration alkaline aqueous solution or not using an alkaline aqueous solution, it is preferable to use a hydrocarbon-based electrolyte membrane from the viewpoint of cost reduction. Examples of the alkaline aqueous solution include a KOH solution and a NaOH solution. Moreover, although the said high concentration changes suitably with the kind etc. of aqueous alkali solution to be used etc., in this description, about 2 mol / l or more is said, and a low concentration means about 2 mol / l or less. Specific examples of the fluororesin-based electrolyte membrane include Tosflex (registered trademark) IE-SF34 manufactured by Tosoh Corporation. Specific examples of the hydrocarbon-based electrolyte membrane include, for example, Aciplex (registered trademark) A-201, 211, 221 manufactured by Asahi Kasei Co., Ltd., Neoceptor (registered trademark) AM-1, AHA manufactured by Tokuyama Corporation. Etc.

  As the porous body 51 used for the cathode electrode 5, for example, carbon paper, carbon cloth, a nonwoven fabric made of carbon fiber, or the like can be used. The porosity of the porous body 51 used for the cathode electrode 5 is preferably about 75 to 98%, more preferably about 80 to 95%.

  The porous body 71 used for the anode electrode 7 is preferably made of a metal. Examples of such a metal porous body 71 include foamed nickel, chromium-containing foamed nickel, foamed titanium, and foamed silver. The porosity of the porous body 71 for the anode electrode 7 is preferably about 75 to 98%, more preferably about 80 to 95%. Moreover, the nominal diameter which is the maximum diameter of the pores of the porous body 71 is about 30 to 700 μm, preferably about 50 to 300 μm.

  The catalyst layers 52 and 72 used for the cathode electrode 5 and the anode electrode 7 contain a catalyst and an anion conductive polymer electrolyte. The content (weight ratio) of the catalyst and the anion conductive polymer electrolyte is not particularly limited, but preferably, catalyst: anion conductive polymer electrolyte = about 5: 1 to 1: 4, more preferably It is about 3: 1 to 1: 3. The catalyst layer 52 used for the cathode electrode 5 and the catalyst layer 72 used for the anode electrode 7 may be the same component or different components.

  The catalyst contained in the catalyst layers 52 and 72 is usually formed by supporting catalyst metal fine particles on a carrier, and a known or commercially available catalyst can be used.

  Examples of the catalyst metal fine particles include platinum, iron, cobalt, nickel, palladium, silver, ruthenium, iridium, molybdenum, and manganese, and these two or more kinds of alloys may be used. When the catalyst metal fine particles are an alloy composed of two or more kinds, it is preferable to contain at least two kinds of platinum, iron, cobalt, and nickel. Examples of such alloys include platinum-iron alloys, platinum-cobalt alloys, iron-cobalt alloys, cobalt-nickel alloys, iron-nickel alloys, and the like, as well as iron-cobalt-nickel alloys. Each ratio of these metals is not limited and can be appropriately selected from a wide range. The particle diameter of the catalytic metal fine particles is not limited, but is usually about 0.05 to 20 nm, preferably about 0.1 to 10 nm, and most preferably about 0.3 to 5 nm. The particle diameter of the catalyst metal fine particles can be measured by, for example, the crystal particle diameter obtained from the half-value width of the diffraction peak of the catalyst component in X-ray diffraction, or the particle diameter of the catalyst component examined by a transmission electron microscope image. it can.

The carrier on which the catalyst metal fine particles are supported is not limited, and a known or commercially available carrier can be used, and examples thereof include alumina particles, silica particles, and carbon particles. From the viewpoint of corrosion resistance and conductivity, carbon particles (particularly conductive carbon particles) are preferred. Examples of the conductive carbon particles include carbon black such as acetylene black, furnace black, channel black, ketjen black, graphite, activated carbon, carbon fiber, carbon nanotube, carbon nanowire, and the like. You may use a seed | species or 2 or more types. The specific surface area of the carbon particles is not limited, but is usually about 10 to 1500 m ² / g, preferably about 10 to 500 m ² / g. The particle size is generally about 0.01 to 1 μm, preferably about 0.01 to 0.2 μm, as the average primary particle size. The particle size of the conductive carbon particles can be measured by, for example, the particle size of the conductive carbon examined by a particle size distribution meter using a laser diffraction apparatus or a transmission electron microscope image.
The amount of the catalyst metal fine particles supported is appropriately determined depending on the type of the catalyst metal fine particles and the carrier, but is usually about 1 to 80 parts by weight, preferably about 3 to 50 parts by weight with respect to 100 parts by weight of the carrier. That's fine.

The anion conductive polymer electrolyte contained in the catalyst layers 52 and 72 may be any electrolyte that can conduct hydroxyl ion (OH ^- ion) as an anion, and any known or commercially available one can be used. Any electrolyte of the type and fluororesin type can be used. Examples of the hydrocarbon electrolyte include an electrolyte obtained by aminating a chloromethylated product of a copolymer of aromatic polyether sulfonic acid and aromatic polythioether sulfonic acid. Examples of the fluororesin-based electrolyte include a polymer obtained by treating the terminal of a perfluorocarbon polymer having a sulfonic acid group with a diamine and quaternizing it, a polymer such as a quaternized product of polychloromethylsulfylene, and the like. In particular, a solvent-soluble one is preferable.

  What is necessary is just to use what was disclosed by Unexamined-Japanese-Patent No. 2003-86193 and Unexamined-Japanese-Patent No. 2000-331693, for example. More specifically, chloromethylation is carried out by reacting a copolymer of aromatic polyether sulfonic acid and aromatic polythioether sulfonic acid with a chloromethylating agent. As the chloromethylating agent, for example, (chloromethoxy) methane, 1,4-bis (chloromethoxy) butane, 1-chloromethoxy-4-chlorobutane, formaldehyde-hydrogen chloride, paraformaldehyde-hydrogen chloride and the like can be used. The chloromethylated product thus obtained is reacted with an amine compound to introduce an anion exchange group. As the amine compound, for example, a monoamine, a polyamine compound having two or more amino groups in one molecule, and the like can be used. Specifically, in addition to ammonia, monoalkylamines such as methylamine, ethylamine, propylamine and butylamine, dialkylamines such as dimethylamine and diethylamine, aromatic amines such as aniline and N-methylaniline, pyrrolidine, piperazine and morpholine Monoamines such as heterocyclic amines, and polyamine compounds such as m-phenylenediamine, pyridazine, and pyrimidine can be used. These anion conductive polymer electrolytes are usually dispersed at a concentration of 5 to 30% by weight in an organic solvent such as alcohol or ether or a mixed solvent of an organic solvent and water.

  Moreover, the catalyst layers 52 and 72 may further contain a fluorine-based resin in addition to the above-described catalyst and anion conductive polymer electrolyte. By containing this fluororesin, the binding property of the above components is improved, and a stronger catalyst layer can be provided and at the same time water repellency can be imparted. Examples of the fluororesin include polytetrafluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, vinylidene fluoride-hexafluoropropylene copolymer, and the like. Among these, polytetrafluoroethylene is preferable from the viewpoint of better binding and water repellency. The content of the fluororesin is usually about 5 to 25 parts by weight, preferably about 10 to 15 parts by weight with respect to 100 parts by weight of the catalyst.

  For the first to third fixing members 2, 4, and 6, known or commercially available thermosetting resins can be used. For example, epoxy resin, melamine resin, phenol resin, unsaturated polyester resin, polyethylene resin (PE), high density polyethylene resin (HDPE), medium density polyethylene resin (MDPE), low density polyethylene resin (LDPE), polypropylene resin (PP ), Polystyrene (PS), polyvinyl acetate (PVAc), ABS resin (acrylonitrile butadiene styrene resin), AS resin, acrylic resin (PMMA), and the like.

  Next, a method for manufacturing the above-described solid alkaline fuel cell will be described.

  First, the first fixing member 2 is attached to the electrolyte membrane 3. For this attachment method, various methods can be adopted. For example, the electrolyte membrane 3 is arranged in a mold, and the resin is filled in the mold by injection molding, so that the first fixing member 2 is fixed. The first fixing member 2 can be attached to the electrolyte membrane 3 by molding. In addition, the first fixing member 2 can be attached to the electrolyte membrane 3 by a known technique such as transfer molding, insert molding, molding, or two-color molding.

  Next, the second fixing member 4 is attached to the cathode electrode 5, and the third fixing member 6 is attached to the anode electrode 7. The fixing members 4 and 6 are attached to the electrodes 5 and 7 in the same manner as the method for attaching the first fixing member 2 to the electrolyte membrane 3 described above, and the second fixing member is attached to the porous body 51. 4, and the third fixing member 6 is attached to the porous body 71. Then, catalyst layers 52 and 72 are formed on the porous bodies 51 and 71 to which the fixing members 4 and 6 are attached, respectively.

  The method for forming the catalyst layers 52 and 72 on the porous bodies 51 and 71 includes, for example, preparing the catalyst layer forming paste composition by dispersing the catalyst and the anion conductive polymer electrolyte in a viscosity adjusting solvent. This is applied to the porous bodies 51 and 71 and dried to form the catalyst layers 52 and 72 on the porous bodies 51 and 71. The method for applying the catalyst layer forming paste composition is not particularly limited. For example, knife coaters, bar coaters, sprayers, dip coaters, spin coaters, roll coaters, die coaters, curtain coaters, General methods such as screen printing can be mentioned. Moreover, the drying temperature after apply | coating the paste composition for catalyst layer formation is about 40-100 degreeC normally, Preferably it is about 60-80 degreeC, Although drying time is based also on drying temperature, normally 5 minutes- About 2 hours, preferably about 30 minutes to 1 hour. The viscosity adjusting solvent is not particularly limited, and is appropriately selected within a wide range. For example, various alcohols, various ethers, various dialkyl sulfoxides, water, or a mixture thereof can be used. Among these solvents, alcohol is preferable, and examples of alcohol include methanol, ethanol, n-propanol, isopropanol, n-butanol, tert-butanol, and other monohydric alcohols such as propylene glycol and diethylene glycol. A polyhydric alcohol is mentioned. The blending ratio of the catalyst layer forming paste composition can be appropriately selected within a wide range. For example, 1 part by weight of the catalyst is 1 to 3 parts by weight of the anion conductive polymer electrolyte (solid content). The viscosity adjusting solvent can be about 1 to 100 parts by weight.

  The electrolyte membrane 3 with the first fixing member 2 formed as described above is prepared, and the cathode electrode 5 with the second fixing member 4 is disposed above the electrolyte membrane 3 as shown in FIG. The anode electrode 7 with the third fixing member 6 is disposed below the first electrode. Then, the second and third fixing members 4 and 6 are fitted into the annular recesses 22 of the first fixing member 2 by fitting the annular protrusions 42 and 62 of the second fixing member 4 and 6 to the first fixing member 2. The fixing members 4 and 6 are fixed. Thereby, the electrolyte membrane 3, the cathode electrode 5, and the anode electrode 7 are united. At this time, the catalyst layers 52 and 72 are in contact with the electrolyte membrane 3.

  In addition, in order to improve the sealing performance between the first fixing member 2 and the second and third fixing members 4, 6, the second and third fixing members 4, 6 are used using an adhesive or the like. The annular protrusions 42 and 62 may be bonded to the annular recess 22 of the first fixing member 2. In this case, an adhesive may be applied to the wall surface of the annular recess 22 or the wall surfaces of the annular protrusions 42 and 62 by using a known coating method. Examples of the coating method include brush coating, spraying, dispenser, and inkjet. Is available. Moreover, the well-known adhesive agent can be widely used for the adhesive agent used for the said adhesion | attachment. For example, vinyl acetate emulsion adhesives, nitrile rubber adhesives, epoxy adhesives, acrylic adhesives, cyanoacrylic adhesives, vinyl chloride adhesives, silicone rubber adhesives, hot bonds and hot melts are used. it can. After applying the adhesive, the annular recess 22 and the annular protrusions 42 and 62 are fitted and fixed, or the adhesive is fixed by hot-melting the adhesive by hot pressing after applying the adhesive, thereby improving the sealing performance. I'm going.

  The solid alkaline fuel cell 1 manufactured in this way supplies power to the cathode electrode 5 by supplying an oxidant gas such as oxygen or air and supplies the anode electrode 7 with a fuel gas such as hydrogen or a liquid fuel. Done. Examples of the liquid fuel include alcohols such as monohydric alcohols such as methanol, ethanol and propanol, polyhydric alcohols such as ethylene glycol and propylene glycol, and aqueous solutions in which these alcohols are mixed. In the case of liquid fuel, an alkaline aqueous solution can be added. What is necessary is just to add so that pH after addition may become about 9-14 normally, when adding aqueous alkali solution. Specifically, as such an alkali, a KOH solution, an NaOH solution, or the like may be used. When liquid fuel is used, as shown in FIG. 9, a fuel wicking material 8 can be used to efficiently supply the liquid fuel to the anode electrode 7. The fuel wicking material 8 is disposed in the liquid fuel, and the upper surface of the fuel wicking material 8 is disposed so as to contact the lower surface of the third fixing member 6. Examples of the material of the fuel sucking material 8 include a sponge such as urethane foam and a polymer porous body such as foamed polypropylene.

  As described above, according to the present embodiment, the electrolyte membrane 3 and the electrodes 5, 7 are integrated by fitting the annular recess 22 formed in each of the fixing members 2, 4, 6 and the annular projections 42, 62. Therefore, the positional accuracy of the electrodes 5 and 7 can be improved.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention. For example, as shown in FIG. 10, the current collector 9 is electrically connected to the electrodes 5 and 7 and extends through the second and third fixing members 4 and 6 to the outside. It can also be attached to the three fixing members 4 and 6. Preferred examples of the material for the current collector 9 include aluminum, nickel, copper, silver, gold, and platinum.

  In addition, as shown in FIG. 11, the first fixing member 2 is attached to the membrane / catalyst layer assembly 10 in which the catalyst layers 52 and 72 are formed on both surfaces of the electrolyte membrane 3, and the second material is attached only to the porous bodies 51 and 71. And it can also be set as the structure which attaches the 3rd fixing members 4 and 6. FIG.

  Moreover, in the said embodiment, although the 1st fixing member 2 was attached to the electrolyte membrane 3 by filling resin in a metal mold | die, the method of attaching to the electrolyte membrane 3 of the 1st fixing member 2 is especially to this. For example, the first fixing member 2 divided into two parts in the vertical direction can be prepared, and the electrolyte membrane 3 can be sandwiched and attached by the first fixing member 2.

  The present invention will be described in further detail using examples. In addition, this invention is not limited to the following Example.

Example 1
A mold for forming a fixing member on the electrolyte membrane 3, the cathode electrode 5, and the anode electrode 7 was produced. The electrode mold was adjusted so that the second and third fixing members were 65 × 65 mm and the thickness was 3.5 mm. The mold was provided with a nested structure so as not to crush the electrode excessively, so that the thickness of the electrode could be adjusted relatively freely.

  The first fixing member 2 formed on the electrolyte membrane 3 has a shape as shown in FIG. 2 and was manufactured using a mold so that the first fixing member 2 can be fitted to the second and third fixing members 4 and 6.

  65 × 65 mm anion electrolyte membrane (A-006, thickness 30 μm) as electrolyte membrane 3, 50 × 50 mm carbon cloth (E-TEK, LT-) as porous body 51 of cathode electrode 5 As the porous body 71 of the anode electrode 7, a foamed nickel of 50 × 50 mm (Mitsubishi Materials, thickness 500 μm, nominal diameter 150 μm) is used as an injection molding machine (Sumitomo Heavy Industries, It was set in the above-mentioned mold attached to SE-100D).

  The resin for each fixing member (polyplastic, Vectra, D408) was dried with a hot air dryer at 140 ° C. for 4 hours. The dried resin was placed in the hopper of the injection molding machine, and the resin was heated to 330 ° C. After the temperature of the mold reaches 55 ° C., using an automatic transfer machine (manufactured by Yushin Seiki), the electrolyte membrane 3 or the like is placed at a predetermined position in the mold so that the four gates are aligned with the respective resin introduction positions. Each electrode 5 and 7 was arranged. The suction mechanism for fixing the member was operated to fix the electrolyte membrane 3 and the electrodes 5 and 7 in the mold, and the mold was clamped as it was. The resin was injected at a speed of 250 mm / second, and after cooling, the electrolyte membrane 3 with the fixing member and the porous bodies 51 and 71 were taken out by the automatic transfer machine.

  Next, catalyst layers 52 and 72 were formed on the porous bodies 51 and 71 to which the respective fixing members were attached. As an electrolyte binder, 100 g of a 5 wt% anion (hydroxyl ion) conductive polymer electrolyte was obtained by amination of a chloromethylated product of a copolymer of aromatic polyether sulfonic acid and aromatic polythioether sulfonic acid. .

In the porous body 71 for the anode electrode 7, a catalyst dispersion composed of a platinum-supported carbon catalyst (manufactured by Tanaka Kikinzoku Kogyo Co., Ltd., TEC10E50E), water, and ethanol as an anode catalyst layer 72 by a spray method is 4 mg / cm ^2. The anode catalyst layer 72 was formed by spraying.

Moreover, as the cathode catalyst layer 52, the catalyst dispersion liquid produced above was sprayed on the porous body 51 so as to be 4 mg / cm ² , thereby forming the cathode catalyst layer 52.

  The cathode electrode 5 and the anode electrode 7 with the fixing members 4 and 6 produced as described above are arranged so that the catalyst layers 52 and 72 face each other through the electrolyte membrane 3 as shown in FIG. The solid alkaline fuel cell 1 was manufactured by pressing and integrating with an epoxy resin so that the structure was cathode electrode 5 / electrolyte membrane 3 / anode electrode 7.

(Comparative Example 1)
A flat fixing member having no concave portion or convex portion is formed only on the outer peripheral edge portion of the electrolyte membrane 3, the cathode electrode 5, and the anode electrode 7, and the layer configuration becomes the cathode electrode 5 / electrolyte membrane 3 / anode electrode 7. Thus, it integrated, pressing using an epoxy resin.

(Evaluation methods)
The obtained molded product of Example 1 was confirmed by visual observation using a transmission image by X-ray using a microfocus X-ray CT apparatus (SMX-130CT-SV3) manufactured by Shimadzu Corporation. On the other hand, Comparative Example 1 had a positional shift.

DESCRIPTION OF SYMBOLS 1 Solid alkaline fuel cell 2 1st fixing member 21 Opening part 22 Annular recessed part (fitting part)
3 Electrolyte membrane 4 Second fixing member 41 Top plate portion 42 Annular convex portion (fitting portion)
43 Through-hole 5 Cathode electrode 51, 71 Porous body 52, 72 Catalyst layer 6 Third fixing member 61 Top plate part 62 Annular convex part (fitting part)
63 Through-hole 7 Anode electrode 9 Current collector

Claims (8)

An electrolyte membrane;
A first fixing member attached to the electrolyte membrane and having a fitted portion;
A cathode electrode laminated on one surface of the electrolyte membrane;
A second fixing member attached to the cathode electrode and having a fitting portion that fits with a fitted portion of the first fixing member when the cathode electrode is laminated on one surface of the electrolyte membrane;
An anode electrode laminated on the other surface of the electrolyte membrane;
A third fixing member attached to the anode electrode, and having a fitting portion that fits with a fitted portion of the first fixing member when the anode electrode is laminated on the other surface of the electrolyte membrane;
A solid alkaline fuel cell. The first fixing member has a frame shape having an opening at the center and is attached to the outer peripheral edge of the electrolyte membrane, and annular recesses are formed on both surfaces as the fitted portion,
2. The solid alkaline fuel cell according to claim 1, wherein the second and third fixing members are formed with annular convex portions that fit into the annular concave portions as the fitting portions. The cathode electrode and the anode electrode have a porous body and a catalyst layer formed on one surface of the porous body, and are laminated on the electrolyte membrane so that the catalyst layer is in contact with the electrolyte membrane. And
At least one of the second and third fixing members has a top plate portion formed slightly larger than the cathode electrode or the anode electrode and joined to the other surface of the porous body. A joint is formed on the outer peripheral edge of the top plate,
3. The solid alkaline fuel cell according to claim 1, wherein the top plate portion has a plurality of through holes so that the other surface of the porous body is exposed. A first current collector electrically connected to the cathode electrode;
A second current collector electrically connected to the anode electrode;
The solid alkaline fuel cell according to claim 1, further comprising: The first fixing member and the second fixing member airtightly cover the side surface of the cathode electrode when fitted to each other;
5. The solid alkaline fuel cell according to claim 1, wherein the first fixing member and the third fixing member hermetically cover a side surface of the anode electrode when fitted to each other. An electrolyte membrane with a fixing member for a solid alkaline fuel cell, in which an electrode with a fixing member having a fitting portion is laminated,
An electrolyte membrane;
A fixing member attached to the electrolyte membrane and having a fitted portion that fits with a fitting portion of an electrode with a fixing member;
An electrolyte membrane with a fixing member. An electrode with a fixing member for a solid alkaline fuel cell, which is laminated on an electrolyte membrane with a fixing member having a fitted portion,
Electrodes,
A fixing member attached to the electrode and having a fitting portion that fits with a fitting portion of an electrolyte membrane with a fixing member;
An electrode with a fixing member. A membrane-catalyst layer assembly in which catalyst layers are formed on both surfaces of the electrolyte membrane;
A first fixing member attached to the membrane catalyst layer assembly and having a fitted portion;
A porous body for a cathode electrode laminated on one surface of the membrane catalyst layer;
The cathode electrode porous body is attached to the cathode electrode porous body, and when the cathode electrode porous body is laminated on one surface of the membrane-catalyst layer assembly, the first fixing member is fitted to the fitted portion. A second fixing member having a fitting portion to be
A porous body for an anode electrode laminated on the other surface of the membrane catalyst layer;
Attached to the anode electrode porous body and fitted with the mating portion of the first fixing member when the anode electrode porous body is laminated on the other surface of the membrane-catalyst layer assembly A third fixing member having a fitting portion to be
A solid alkaline fuel cell.

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