JP2005174770A - Fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid polymer type fuel cell having a simple structure and capable of having a higher output, downsizing and thinning. <P>SOLUTION: The fuel cell structures a plurality of unit cells by pinching a solid polymer electrolyte membrane 114 with fuel electrodes 102a, b, arranged on one of surfaces of the solid polymer electrolyte membrane 114, and oxidant electrodes 108a, b, arranged on the other surface. Movement of hydrogen ion to an adjacent unit cell is suppressed, and voltage drop is prevented by providing a groove part 302 in an area between unit cells on the solid polymer electrolyte membrane 114. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fuel cell, and more particularly to a fuel cell using a solid electrolyte membrane.

  The polymer electrolyte fuel cell is formed by using an ion exchange membrane such as a perfluorosulfonic acid membrane as an electrolyte, and joining each electrode of a fuel electrode and an oxidizer electrode on both sides of the ion exchange membrane, and hydrogen, It is a device that supplies oxygen or air to the oxidizer electrode and generates electricity by an electrochemical reaction. In order to cause this reaction, a polymer electrolyte fuel cell usually has an ion exchange membrane and a catalyst layer comprising a mixture of carbon fine particles carrying a catalyst substance formed on both surfaces thereof and a solid polymer electrolyte. The gas diffusion layer (supply layer) made of a porous carbon material for the purpose of supplying and diffusing fuel and oxidizing gas, and the current collector made of a conductive thin plate of carbon or metal.

  In recent years, research and development of a direct methanol solid polymer fuel cell having the same configuration as described above and supplying an organic liquid fuel such as methanol directly to the fuel electrode as a fuel has been actively conducted.

  In the above configuration, the fuel supplied to the fuel electrode passes through the pores in the diffusion layer (supply layer) and reaches the catalyst, and the fuel is decomposed by the catalyst to generate electrons and hydrogen ions. The electrons are led to the external circuit through the catalyst carrier in the electrode and the gas diffusion layer (supply layer), and flow into the oxidant electrode from the external circuit. On the other hand, hydrogen ions reach the oxidant electrode through the electrolyte in the electrode and the solid polymer electrolyte membrane between the two electrodes, and react with oxygen supplied to the oxidant electrode and electrons flowing from the external circuit to produce water. As a result, in the external circuit, electrons flow from the fuel electrode toward the oxidant electrode, and electric power is taken out.

  However, since the cell voltage of the solid polymer fuel cell unit of this basic configuration corresponds to the oxidation-reduction potential difference at each electrode, it is at most 1.23 V even at an ideal open-circuit voltage. For this reason, as a drive power supply mounted in various apparatuses, it cannot necessarily be said that battery output is sufficient. For example, when a fuel cell is used as a driving power source for portable devices, many of those devices require an input voltage of about 1.5 to 4 V or more as a power source. For this reason, it is necessary to connect the unit cells in series and increase the voltage of the battery.

  Therefore, in order to increase the battery voltage, it is conceivable to secure a sufficient voltage by stacking unit cells. However, since the entire battery is thickened in this way, a portable device that is required to be thinned. Such a drive power source is not preferable. For these reasons, a technique for realizing a thin battery is desired.

  In Patent Document 1, a plurality of oxidizer electrodes are disposed on one surface side of one electrolyte membrane, and a plurality of fuel electrodes are disposed on the other surface side of the electrolyte membrane, thereby providing a plurality of unit cells. A fuel cell having the same plane is disclosed.

In Patent Document 2, a through hole is formed in an ion conductor plate, and a positive electrode formed on one surface side of the ion conductive plate and a negative electrode formed on the other surface side through the through hole. A method of connection is described (paragraph 0007). That is, Patent Document 3 discloses a penetrating member in which a plurality of fuel electrodes are disposed on one surface of a solid electrolyte membrane and a plurality of oxidizer electrodes are disposed on the other surface, and between adjacent unit cells penetrates the solid electrolyte membrane. Describes a configuration electrically connected in series.
Since the technique of the above publication can increase the output by electrically connecting a plurality of cells, it has a certain effect in terms of obtaining a power supply voltage for driving the device.

JP-A-8-171925 JP 2002-110215 A

  However, the technique described in Patent Document 1 has a problem that the hydrogen ions generated in the fuel electrode of a certain unit cell move to the oxidant electrode of the adjacent unit cell and the voltage decreases. . In particular, when the interval between the unit cells is brought close to the thickness of the electrolyte membrane, electrical leakage becomes remarkable, and a decrease in voltage cannot be avoided.

Moreover, since the technique described in Patent Document 2 has a positional relationship in which through holes are arranged between unit cells, current leakage may occur between the electrodes constituting the unit cells and the through holes. In addition, hydrogen ions generated at the fuel electrode of a certain unit cell may move to the oxidant electrode of the adjacent unit cell, and this may affect the value of the current flowing through the through hole.
In view of the above circumstances, an object of the present invention is to provide a planar stack type fuel cell in which electrical leakage between unit cells is suppressed.

  According to the present invention for solving the above problems, a solid electrolyte membrane, a first electrode disposed on one surface of the solid electrolyte membrane, a second electrode provided adjacent to the first electrode, and the solid A third electrode and a fourth electrode disposed opposite to the first and second electrodes on the other surface of the electrolyte membrane, respectively, and configured by the first electrode, the third electrode, and the solid electrolyte membrane Between the first unit cell and the second unit cell in a region between the first unit cell formed and the second unit cell constituted by the second electrode, the fourth electrode and the solid electrolyte membrane. There is provided a fuel cell comprising a low ion conductivity region provided at a distance from each other.

  The fuel cell of the present invention has a configuration in which two or more unit cells sharing a single solid electrolyte membrane are arranged in the plane direction. For this reason, it becomes possible to arrange unit cells in a highly integrated and planar manner.

And the low ion conductivity area | region provided in the unit cell electrically spaced apart from the unit cell is provided. By providing such a region, electrical leakage between the unit cells can be effectively suppressed.
By reducing the interval between the unit cells, the fuel cell can be further reduced in size. However, in such a case, an electrical leak occurs as described above, which causes a problem that the voltage decreases. Therefore, in the fuel cell of the present invention, the above-described electrical leakage is prevented by providing a low ion conductive region in the region between the unit cells on the solid electrolyte membrane. For this reason, since the voltage drop is suppressed even when the interval between the unit cells is approximately the same as the thickness of the solid electrolyte membrane, a small, thin and high output fuel cell is realized. Here, the low ion conductive region in the present invention refers to a region where the hydrogen ion conductivity is low as compared with the solid electrolyte membrane.

  As described above, according to the present invention, it is possible to provide a solid polymer fuel cell having a simple structure and having a high output and a reduced size and thickness.

  In the present invention, one of the electrode group consisting of the first electrode and the second electrode and the other electrode group consisting of the third electrode and the fourth electrode is a fuel electrode and the other electrode The group may be an oxidizer electrode. That is, the fuel electrode may be disposed on one surface of the solid electrolyte membrane, and the oxidant electrode may be disposed on the other surface. By doing so, it is not necessary to provide a flow path for supplying fuel or oxidant individually for each unit cell, and it is possible to supply fuel or oxidant to the two or more unit cells at once. Therefore, since the mechanism can be simplified, it is possible to reduce the size of the fuel cell.

  As the low ion conductive region, for example, a region in which a recess is formed in a solid electrolyte membrane can be used. The concave portion includes a groove portion, a hole, and the like. The recess may or may not penetrate the solid electrolyte membrane.

  The recess may be filled with a member that is electrically separated from the first unit cell and the second unit cell. For example, an insulator may be filled in the recess. Since the filling member inside the recess is provided electrically separated from each unit cell, current leakage between the filling member and the unit cell electrode does not occur, and according to such a configuration, a new leak path is generated. Thus, electrical leakage between unit cells can be suppressed. When the filling member is an insulator, any one of a fluorine resin, a polyimide resin, a phenol resin, and an epoxy resin can be used as the insulator.

  As another example of the low ion conductive region, a region where the solid electrolyte membrane is irradiated with ions can be exemplified. For example, such a configuration can be realized by a method such as irradiating the electrolyte membrane with Ar ions.

  In the present invention, the first unit cell and the second unit cell may be connected in parallel or may be connected in series. These cells can be connected by an external conductive member provided outside the solid electrolyte. Further, the first unit cell and the second unit cell may be configured to be electrically isolated.

In the present invention, three or more unit cells may be provided. In this case, all the unit cells may be connected in series or all in parallel. In addition, it is possible to connect only some cells in parallel and others in series, and it is possible to obtain a fuel cell having a desired voltage or current value.
The present invention is particularly effective when applied to a fuel cell in which liquid fuel is directly supplied to the fuel electrode, such as a direct methanol fuel cell.

First Embodiment FIG. 1 is a diagram showing a configuration of a fuel cell according to the present embodiment. FIG. 1A is a perspective view schematically showing the structure of the fuel cell of the present embodiment, and FIG. 1B is a cross-sectional view taken along line AA ′ in FIG. As shown in FIGS. 1A and 1B, fuel electrodes 102 a and 102 b are arranged on one surface of a single solid polymer electrolyte membrane 114, and the other surface of the solid polymer electrolyte membrane 114 is arranged on the other surface. Oxidant electrodes 108a and 108b are arranged. Current collectors 120 and 121 are connected to the fuel electrodes 102a and 102b, and current collectors 122 and 123 are connected to the oxidant electrodes 108a and 108b. The fuel electrodes 102a and 102b and the oxidant electrodes 108a and 108b are composed of a base and a catalyst layer (not shown).

  As shown in FIG. 1B, a fuel 125 is supplied to the fuel electrodes 102a and 102b, and an oxidant 126 such as air or oxygen is supplied to the oxidant electrodes 108a and 108b. In the fuel cell of this embodiment, the fuel electrodes 102a and 102b and the oxidizer electrodes 108a and 108b of a plurality of unit cells are arranged on the same side with the solid polymer electrolyte membrane 114 as a boundary. Accordingly, since the fuel flow path for supplying fuel and the oxidant flow path for supplying oxidant are each provided in one system, the structure of the fuel cell can be simplified. Here, since the solid polymer electrolyte membrane 114 has a role of a partition wall that separates the fuel electrode side and the oxidant electrode side, the fuel 125 does not enter the oxidant electrode side, and the oxidant 126. Does not enter the fuel electrode side.

Grooves 302 are provided between the unit cells. The portion where the groove 302 is provided is a low ion conductive region, and by providing this region, electrical leakage between unit cells is suppressed. The two unit cells shown are not directly connected. However,
(i) Between the fuel electrode 102a and the fuel electrode 102b,
(ii) Between the fuel electrode 102a and the oxidant electrode 108b,
(iii) Between the oxidant electrode 108a and the fuel electrode 102b,
In this case, electrical leakage may occur. According to this embodiment, since the groove part 302 is provided, the said electrical leak can be suppressed effectively. That is, hydrogen ions generated at the fuel electrodes 102a and 102b can be effectively led to the oxidant electrodes 108a and 108b.

In the fuel cell of FIG. 1, the solid polymer electrolyte membrane 114 separates the fuel electrodes 102a, 102b from the oxidizer electrodes 108a, 108b and has a role of moving hydrogen ions between them. For this reason, it is preferable that the solid polymer electrolyte membrane 114 is a membrane having high hydrogen ion conductivity. Further, it is preferably chemically stable and has high mechanical strength. As a material constituting the solid polymer electrolyte membrane 114,
An organic polymer having a polar group such as a strong acid group such as a sulfone group, a phosphoric acid group, a phosphone group or a phosphine group, or a weak acid group such as a carboxyl group is preferably used. As these organic polymers,
Aromatic-containing polymers such as sulfonated poly (4-phenoxybenzoyl-1,4-phenylene), alkylsulfonated polybenzimidazole;
Copolymers such as polystyrene sulfonic acid copolymer, polyvinyl sulfonic acid copolymer, cross-linked alkyl sulfonic acid derivative, fluorine resin skeleton and fluorine-containing polymer comprising sulfonic acid;
A copolymer obtained by copolymerizing acrylamides such as acrylamide-2-methylpropane sulfonic acid and acrylates such as n-butyl methacrylate;
Sulfon group-containing perfluorocarbon (Nafion (DuPont), Aciplex (Asahi Kasei));
Carboxyl group-containing perfluorocarbon (Flemion S membrane (Asahi Glass Co., Ltd.));
Etc. are exemplified.

  When an organic liquid fuel is used and an aromatic-containing polymer such as sulfonated poly (4-phenoxybenzoyl-1,4-phenylene) or alkylsulfonated polybenzimidazole is selected, the organic The permeation of liquid fuel can be suppressed, and a decrease in battery efficiency due to crossover can be suppressed.

  The fuel electrodes 102a, 102b and the oxidizer electrodes 108a, 108b can be configured, for example, by forming a film containing carbon particles supporting a catalyst and solid polymer electrolyte fine particles on a substrate. The substrate surface may be subjected to a water repellent treatment.

  As the substrate, a porous substrate such as carbon paper, a carbon molded body, a carbon sintered body, a sintered metal, and a foam metal can be used for both the fuel electrode and the oxidant electrode. A water repellent such as polytetrafluoroethylene can be used for the water repellent treatment of the substrate.

  Examples of the catalyst for the fuel electrode include platinum, rhodium, palladium, iridium, osmium, ruthenium, rhenium, gold, silver, nickel, cobalt, lithium, lanthanum, strontium, yttrium, etc., and these may be used alone or in combination of two or more. Can be used. On the other hand, as the catalyst for the oxidant electrode, the same catalyst as that for the fuel electrode can be used, and the above exemplified substances can be used. The fuel electrode and oxidant electrode catalysts may be the same or different.

  Examples of the carbon particles supporting the catalyst include acetylene black (Denka Black (manufactured by Denki Kagaku), XC72 (manufactured by Vulcan), etc.), Ketjen Black, carbon nanotube, carbon nanohorn, and the like. The particle size of the carbon particles is, for example, 0.01 to 0.1 μm, preferably 0.02 to 0.06 μm.

  As the fuel 125, an organic liquid fuel containing hydrogen, methanol, ethanol, or the like, or a hydrogen-containing gas can be used.

  The method for producing the fuel electrodes 102a, 102b and the oxidant electrodes 108a, 108b is not particularly limited, but can be produced, for example, as follows. First, the catalyst of the fuel electrodes 102a and 102b and the oxidizer electrodes 108a and 108b can be supported on carbon particles by a generally used impregnation method. Next, the carbon particles supporting the catalyst and the solid polymer electrolyte particles are dispersed in a solvent to form a paste, which is then applied to a substrate and dried to thereby form the fuel electrodes 102a and 102b and the oxidizer electrodes 108a and 108b. Can be obtained. Here, the particle size of the carbon particles is, for example, 0.01 to 0.1 μm. The particle size of the catalyst particles is, for example, 1 nm to 10 nm. The particle diameter of the solid polymer electrolyte particles is, for example, 0.05 to 1 μm. For example, the carbon particles and the solid polymer electrolyte particles are used in a weight ratio of 2: 1 to 40: 1. Further, the weight ratio of water and solute in the paste is, for example, about 1: 2 to 10: 1. Although there is no restriction | limiting in particular about the coating method of the paste to a base | substrate, For example, methods, such as brush coating, spray coating, and screen printing, can be used. The paste is applied with a thickness of about 1 μm to 2 mm. After applying the paste, heating is performed at a heating temperature and a heating time according to the fluororesin to be used, and the fuel electrodes 102a and 102b or the oxidizer electrodes 108a and 108b are manufactured. The heating temperature and the heating time are appropriately selected depending on the material to be used. For example, the heating temperature may be 100 ° C. to 250 ° C., and the heating time may be 30 seconds to 30 minutes.

  The solid polymer electrolyte membrane 114 can be produced by employing an appropriate method depending on the material to be used. For example, when the solid polymer electrolyte membrane 114 is composed of an organic polymer material, a liquid obtained by dissolving or dispersing the organic polymer material in a solvent is cast on a peelable sheet such as polytetrafluoroethylene and dried. Can be obtained.

The solid polymer electrolyte membrane 114 produced as described above is sandwiched between the fuel electrodes 102a and 102b and the oxidant electrodes 108a and 108b and hot-pressed to obtain an electrode-electrolyte assembly. At this time, the surface on which the catalyst of both electrodes is provided is in contact with the solid electrolyte membrane. The hot pressing conditions are selected according to the material, but when the solid electrolyte membrane or the electrolyte membrane on the electrode surface is composed of organic polymers, the temperature should be higher than the softening temperature or glass transition temperature of these polymers. Can do. Specifically, for example, the temperature is 100 to 250 ° C., the pressure is 1 to 100 kg / cm ² , and the time is 10 seconds to 300 seconds.

  The electrode-electrolyte assembly obtained as described above is sandwiched between current collectors 120 to 123. Thereafter, the current collectors 121 and 122 are electrically connected by the external connection electrode 124, whereby a fuel cell connected in series can be obtained. The current collectors 120 to 123 are conductive members, and for example, stainless steel or titanium can be used.

  In the above description, the case where there are two unit cells has been described for the sake of simplicity. However, the present invention is not limited to this, and the present invention can also be applied to a form using three or more unit cells.

Second Embodiment FIG. 2 is a diagram showing a configuration of a fuel cell according to the present embodiment. FIG. 2A is a perspective view of a form in which the hole 303 is provided, and a cross-sectional view taken along the line AA ′ in FIG. 2B is FIG. By providing the hole 303, it is possible to reduce ion conductivity when hydrogen ions generated in the fuel electrode 102a move to the oxidant electrode 108b of the adjacent unit cell. Therefore, electrical leakage can be suppressed and hydrogen ions generated at the fuel electrode 102a can be effectively guided to the oxidant electrode 108a.

Third Embodiment In the above-described embodiment, the groove 302 or the hole 303 can be filled with an insulator. Such a form is shown in FIGS. FIG. 3A shows a perspective view of a configuration in which the insulating resin 304 is sandwiched between the groove portions, and a cross-sectional view taken along the line AA ′ in FIG. 3B is FIG. FIG. 4A shows a perspective view of a configuration in which the concave portion is filled with an insulating resin 304, and FIG. 4B is a cross-sectional view thereof. By adopting such a configuration, electrical leakage can be further suppressed.
Note that as the insulating resin 304, a material such as a fluorine resin, a polyimide resin, a phenol resin, or an epoxy resin can be used.

Fourth Embodiment In a fuel cell according to this embodiment, unit cells are connected in parallel. FIG. 5 is a diagram showing a configuration of the fuel cell according to the present embodiment. The unit cells are connected by an external connection electrode 124 provided outside the solid electrolyte membrane 114.
The current collectors 120 to 123 and the external connection electrode 124 are conductive members, and for example, stainless steel or titanium can be used.
According to this embodiment, since the low ion conductive region including the groove 302 is provided, the movement of hydrogen ions generated at the fuel electrode 102a to the oxidant electrode 108b of the adjacent unit cell is suppressed. Therefore, electrical leakage can be suppressed and hydrogen ions generated at the fuel electrode 102a can be effectively guided to the oxidant electrode 108a.

Fifth Embodiment A fuel cell according to this embodiment includes a low ion conductivity region including an ion irradiation unit. FIG. 6A is a perspective view of a form in which an ion irradiation unit 305 is provided, and FIG. 6B is a cross-sectional view thereof. The ion irradiation unit 305 is a region formed by irradiating the solid electrolyte membrane 114 with argon ions. The acceleration voltage of ion irradiation is set to 400 to 500 keV, for example. This region has lower ionic conductivity than the solid electrolyte membrane 114, and can effectively suppress electrical leakage between unit cells. Ion irradiation has been described here using an example of argon, but the present invention is not limited to this, and various methods can be used.

Sixth Embodiment In the present embodiment, an example of a planar stack type fuel cell in which electrical leakage between unit cells is suppressed will be described. 7, 8, and 9 are diagrams showing examples of unit cell arrangement.

In FIG. 7, two unit cells on the left side in the drawing are provided in the same circuit, and two unit cells on the right side in the drawing are provided in the same circuit. In the figure, the upper unit cell and the lower unit cell are connected to each other by a through hole (not shown). As shown in the figure, a groove 302 is provided between the unit cells.
8 and FIG. 9, the two unit cells on the left side in the figure and the two unit cells on the right side in the figure are connected in series by through holes penetrating the solid electrolyte membrane 114, respectively. These are connected in parallel. As shown in the figure, a groove 302 is provided between the unit cells.

  According to this embodiment, since the low ion conductive region including the groove 302 is provided, a planar stack type fuel cell in which electrical leakage between unit cells is suppressed is provided. In this embodiment, the low ion conductivity region including the groove 302 is used. However, various low ion conductivity regions described in the above embodiments can be applied.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention.

(Example 1)
In this example, a fuel cell having the structure shown in FIG. 1 was produced. As the catalyst, catalyst-supported carbon particles in which 50% by weight of platinum (Pt) -ruthenium (Ru) alloy having a particle diameter of 3 to 5 nm was supported on carbon particles (Denka Black; manufactured by Denki Kagaku) were used. 18 g of 5 wt% Nafion solution manufactured by Aldrich Chemical Co. was added to 1 g of the catalyst-supporting carbon fine particles, and the mixture was stirred with an ultrasonic mixer at 50 ° C. for 3 hours to obtain a catalyst paste. 2 mg / cm ^{2 of} this paste was applied on carbon paper (Toray Industries, Inc .: TGP-H-120) by screen printing, and dried at 120 ° C. to obtain an electrode.

  Next, the electrode obtained above was thermocompression bonded at 120 ° C. to a single solid polymer electrolyte membrane 114 (Nafion (registered trademark) manufactured by DuPont, film thickness 150 μm), and the fuel electrodes 102a and 102b and the oxidant Two sets of unit cells were created with poles 108a and b. The interval between the two unit cells was 0.2 mm. Further, a groove 302 having a width of 0.05 mm and a depth of 0.1 mm was provided between the two unit cells.

  The two unit cells were sandwiched between stainless steel current collectors 120-123. Furthermore, the current collector 121 and the current collector 122 were connected in series via the external connection electrode 124. Further, a fuel container made of Teflon (registered trademark) was attached to the fuel electrode 102 side. The two fuel electrodes 102 were covered with the fuel container and sealed with the solid polymer electrolyte membrane 114 and the fuel container. Each unit cell is provided in a separate circuit and is not electrically connected.

  When the characteristics of the battery were measured by flowing a 10% aqueous methanol solution at 2 ml / min inside the fuel cell and exposing the outside to the atmosphere, there was almost no electrical leakage between unit cells, and good results were obtained. .

(Example 2)
In this example, a fuel cell having the structure shown in FIG. 3 was produced. The fuel cell of this example has the same configuration as that of Example 1 except that the groove 302 is filled with an insulator. In the solid polymer electrolyte membrane 114 in this example, an insulating resin 304 (Kapton (registered trademark) manufactured by DuPont) made of polyimide is sandwiched between the groove portions 302 provided on the solid polymer electrolyte membrane 114 in FIG. It is glued. Other configurations are the same as those of the first embodiment.

  When the characteristics of the battery were measured by flowing a 10% aqueous methanol solution at 2 ml / min inside the fuel cell and exposing the outside to the atmosphere, there was almost no electrical leakage between unit cells, and good results were obtained. .

(Example 3)
In this example, a fuel cell comprising four unit cells having the structure shown in FIGS. 5 and 9 was produced. The configuration of the unit cell and the manufacturing method are the same as in Example 1. When the characteristics of the battery were measured by flowing a 10% aqueous methanol solution at 2 ml / min inside the fuel cell and exposing the outside to the atmosphere, there was almost no electrical leakage between unit cells, and good results were obtained. .

It is a figure which shows the structure of the fuel cell which concerns on embodiment. It is a figure which shows the structure of the fuel cell which concerns on embodiment. It is a figure which shows the structure of the fuel cell which concerns on embodiment. It is a figure which shows the structure of the fuel cell which concerns on embodiment. It is a figure which shows the structure of the fuel cell which concerns on embodiment. It is a figure which shows the structure of the fuel cell which concerns on embodiment. It is a figure which shows the example of arrangement | positioning of a unit cell. It is a figure which shows the example of arrangement | positioning of a unit cell. It is a figure which shows the example of arrangement | positioning of a unit cell.

Explanation of symbols

102, 102a, 102b Fuel electrode 108, 108a, 108b Oxidant electrode 114 Solid polymer electrolyte membrane 120, 121, 122, 123 Current collector 124 Connection electrode 125 Fuel 126 Oxidant 302 Groove 303 Recess 304 Insulating resin 305 Ion irradiation Part

Claims (10)

A solid electrolyte membrane, a first electrode disposed on one surface of the solid electrolyte membrane, and a second electrode provided adjacent to the first electrode;
A third electrode and a fourth electrode disposed on the other surface of the solid electrolyte membrane so as to face the first electrode and the second electrode, respectively;
With
Between the first unit cell constituted by the first electrode, the third electrode and the solid electrolyte membrane, and the second unit cell constituted by the second electrode, the fourth electrode and the solid electrolyte membrane. A fuel cell comprising: a low ion conductive region provided in a region electrically separated from the first unit cell and the second unit cell. The fuel cell according to claim 1, wherein
The fuel cell according to claim 1, wherein the low ion conductive region is a region in which a recess is formed in the solid electrolyte membrane. The fuel cell according to claim 2, wherein
A fuel cell, wherein the recess is filled with a member that is electrically separated from the first unit cell and the second unit cell. The fuel cell according to claim 3, wherein
The fuel cell, wherein the member is an insulator. The fuel cell according to claim 1, wherein
The fuel cell according to claim 1, wherein the low ion conductive region is a region where the solid electrolyte membrane is irradiated with ions. The fuel cell according to any one of claims 1 to 5,
Of the electrode group consisting of the first electrode and the second electrode and the other electrode group consisting of the third electrode and the fourth electrode, one of the electrode groups is a fuel electrode and the other electrode group is an oxidizing agent A fuel cell characterized by being an electrode. The fuel cell according to any one of claims 1 to 6,
The fuel cell, wherein the first unit cell and the second unit cell are connected in parallel. The fuel cell according to any one of claims 1 to 6,
The fuel cell, wherein the first unit cell and the second unit cell are connected in series. The fuel cell according to claim 7 or 8,
The fuel cell, wherein the first unit cell and the second unit cell are connected by an external conductive member provided outside the solid electrolyte. The fuel cell according to any one of claims 1 to 9,
The fuel cell, wherein the first unit cell and the second unit cell are electrically isolated.

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