Electrochemical Cell

Abstract

An electrolytic cell (1) comprises a metal support (10) and a cell body part (20). The cell body part (20) has: a gas diffusion layer (5) disposed on a first main surface (12) of the metal support (10); and a hydrogen electrode layer (6) disposed on the gas diffusion layer (5). The hydrogen electrode layer (6) has: neighboring pores (61a) located in the vicinity of the gas diffusion layer (5); and fine particles (62) independently present in the neighboring pores (61a).

Description

[Technical field]

[0001] The present invention relates to electrochemical cells. [Background technology]

[0002] Conventionally, electrochemical cells (electrolysis cells, fuel cells, etc.) are known that include a cell body disposed on a metal support. The metal support has a plurality of communication holes formed on a main surface. The cell body has a first electrode layer and a second electrode layer formed on the main surface of the metal support, and an electrolyte layer disposed between the first electrode layer and the second electrode layer.

[0003] Here, Patent Document 1 describes that a gas-permeable and electrically conductive adhesive (hereinafter referred to as a "gas diffusion layer") is interposed between the cell body and the metal support. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2021 / 221052 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the electrochemical cell described in Patent Document 1, when the first electrode layer is deformed due to shear stress generated between the gas diffusion layer and the first electrode layer due to the difference in thermal expansion coefficient between the metal support and the cell body, cracks may occur in the first electrode layer.

[0006] An object of the present invention is to provide an electrochemical cell capable of suppressing cracks in the first electrode layer. [Means for solving the problem]

[0007] An electrochemical cell according to a first aspect of the present invention comprises a metal support having a plurality of communicating holes formed on a main surface, and a cell body portion disposed on the main surface. The cell body portion has a conductive gas diffusion layer disposed on the main surface, a first electrode layer disposed on the gas diffusion layer, a second electrode layer, and an electrolyte layer disposed between the first electrode layer and the second electrode layer. The first electrode layer has adjacent pores located near the gas diffusion layer, and fine particles independently present in the adjacent pores.

[0008] An electrochemical cell according to a second aspect of the present invention is related to the first aspect, wherein the fine particles are metal particles. Effect of the Invention

[0009] According to the present invention, it is possible to provide an electrochemical cell capable of suppressing cracks in the first electrode layer. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a plan view of an electrolysis cell according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA of FIG. [Diagram 3] FIG. 3 is a partially enlarged view of FIG. [Figure 4] FIG. 4 is a schematic diagram for explaining the function of the fine particles. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (Electrolysis cell 1) Fig. 1 is a plan view of an electrolysis cell 1 according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view taken along line AA in Fig. 1.

[0012] The electrolysis cell 1 is an example of an "electrochemical cell" according to the present invention. The electrolysis cell 1 is a so-called metal-supported electrolysis cell.

[0013] The electrolysis cell 1 is formed in a plate shape extending in the X-axis and Y-axis directions. In this embodiment, the electrolysis cell 1 is formed in a rectangular shape extending in the Y-axis direction when viewed in a plan view from the Z-axis direction perpendicular to the X-axis and Y-axis directions. However, the planar shape of the electrolysis cell 1 is not particularly limited, and may be a polygon other than a rectangle, an ellipse, a circle, or the like.

[0014] As shown in FIG. 2, the electrolysis cell 1 includes a metal support 10, a cell main body 20, and a flow path member 30.

[0015] [Metal support 10] The metal support 10 supports the cell main body 20. The metal support 10 is formed in a plate shape. The metal support 10 may be in the shape of a flat plate or a curved plate.

[0016] The metal support 10 is only required to be able to support the cell main body 20, and its thickness is not particularly limited, but can be, for example, 0.1 mm or more and 2.0 mm or less.

[0017] As shown in FIG. 2, the metal support 10 has a plurality of communicating holes 11, a first main surface 12 and a second main surface 13.

[0018] Each communication hole 11 penetrates the metal support 10 from the first main surface 12 to the second main surface 13. Each communication hole 11 opens to each of the first main surface 12 and the second main surface 13. In this embodiment, the opening of each communication hole 11 on the first main surface 12 side is covered by a gas diffusion layer 5 described later. The opening of each communication hole 11 on the second main surface 13 side is connected to a flow path 30a described later.

[0019] Each communication hole 11 can be formed by mechanical processing (for example, punching), laser processing, chemical processing (for example, etching), or the like.

[0020] In this embodiment, each communication hole 11 is formed linearly along the Z-axis direction. However, each communication hole 11 may be inclined with respect to the Z-axis direction, and may not be linear. Furthermore, the communication holes 11 may be connected to each other.

[0021] The first main surface 12 is an example of a "main surface" according to the present invention. The first main surface 12 is provided on the opposite side to the second main surface 13. A cell main body 20 is disposed on the first main surface 12. A flow path member 30 is bonded to the second main surface 13.

[0022] The metal support 10 is made of a metal material. For example, the metal support 10 is made of an alloy material containing Cr (chromium). Examples of such metal materials include Fe-Cr alloy steel (stainless steel, etc.) and Ni-Cr alloy steel. The Cr content of the metal support 10 is not particularly limited, but can be set to 4% by mass or more and 30% by mass or less.

[0023] The metal support 10 may contain Ti (titanium) and / or Zr (zirconium). The Ti content in the metal support 10 is not particularly limited, but may be 0.01 mol% or more and 1.0 mol% or less. The Al content in the metal support 10 is not particularly limited, but may be 0.01 mol% or more and 0.4 mol% or less. The metal support 10 may contain Ti as TiO2 (titania) or Zr as ZrO2 (zirconia).

[0024] The metal support 10 may have an oxide film on its surface, which is formed by oxidation of the constituent elements of the metal support 10. A typical example of the oxide film is a chromium oxide film. The chromium oxide film covers at least a portion of the surface of the metal support 10. The chromium oxide film may also cover at least a portion of the inner wall surface of each of the communicating holes 11.

[0025] [Cell body 20] The cell body 20 is disposed on the metal support 10. The cell body 20 is supported by the metal support 10. The cell body 20 has a gas diffusion layer 5, a hydrogen electrode layer 6 (cathode), an electrolyte layer 7, a reaction prevention layer 8, and an oxygen electrode layer 9 (anode).

[0026] The gas diffusion layer 5, hydrogen electrode layer 6, electrolyte layer 7, reaction prevention layer 8, and oxygen electrode layer 9 are laminated in this order in the Z-axis direction from the metal support 10 side. The gas diffusion layer 5, hydrogen electrode layer 6, electrolyte layer 7, and oxygen electrode layer 9 are essential components, while the reaction prevention layer 8 is optional.

[0027] [Gas diffusion layer 5] The gas diffusion layer 5 is formed on the first main surface 12 of the metal support 10. In this embodiment, the gas diffusion layer 5 covers each of the communication holes 11 of the metal support 10. A part of the gas diffusion layer 5 may extend into each of the communication holes 11 of the metal support 10.

[0028] The gas diffusion layer 5 is a porous body having gas diffusibility and electrical conductivity. The gas diffusion layer 5 supplies the source gas supplied from each of the communication holes 11 to the hydrogen electrode layer 6, and discharges the product gas generated in the hydrogen electrode layer 6 to each of the communication holes 11.

[0029] The gas diffusion layer 5 includes a conductive material. As the conductive material, a metal material such as Ni (nickel) or Fe (iron) or a conductive ceramic material can be used.

[0030] The gas diffusion layer 5 may include a substrate that supports a conductive material. The substrate may be insulating. As the substrate, YSZ, CSZ, ScSZ, GDC, SDC, (La,Sr)(Cr,Mn)O3, (La,Sr)TiO3, Sr2(Fe,Mo)2O6, (La,Sr)VO3, (La,Sr)FeO3, LDC (lanthanum doped ceria), LSGM (lanthanum gallate), and a mixed material of two or more of these may be used.

[0031] The gas diffusion layer 5 may contain a metal element contained in the metal support 10. This is preferable because it improves the adhesion between the gas diffusion layer 5 and the metal support 10. Note that the above-mentioned conductive material is different from the metal element contained in the metal support 10. Therefore, the conductive material contained in the gas diffusion layer 5 does not need to be contained in the metal support 10.

[0032] The porosity of the gas diffusion layer 5 is not particularly limited, but can be, for example, 20% or more and 40% or less.

[0033] The porosity of the gas diffusion layer 5 is calculated by the following method. First, hydrogen is supplied to the gas diffusion layer 5 and the hydrogen electrode layer 6 while the electrolytic cell 1 is heated to 750° C., thereby reducing the conductive material contained in each of the gas diffusion layer 5 and the hydrogen electrode layer 6. Next, the electrolytic cell 1 is cooled while still in a reducing atmosphere, and the electrolytic cell 1 is cut along the thickness direction (Z-axis direction) to expose the cross section of the gas diffusion layer 5. Next, a backscattered electron image of the cross section of the gas diffusion layer 5 is obtained at 10,000 times magnification using an SEM device (FE-SEM JSM-7900F, manufactured by JEOL Ltd.). Next, the part displayed in black in the backscattered electron image (corresponding to the pores) is identified using image analysis software Image-Pro manufactured by MEDIACYBERNETICS. Then, the porosity of the gas diffusion layer 5 is calculated by dividing the total area of ​​the pores by the total area of ​​the backscattered electron image of the gas diffusion layer 5.

[0034] The thickness of the gas diffusion layer 5 is not particularly limited, and may be, for example, 1 μm or more and 50 μm or less. In this specification, the thickness means the thickness in the thickness direction of the cell body 20. The thickness direction is a direction perpendicular to a plane direction parallel to the first main surface 12 of the metal support 10. When specifying the thickness direction, an approximation straight line of the first main surface 12 obtained by the least squares method in a cross section of the metal support 10 along the Z-axis direction is used.

[0035] The method for forming the gas diffusion layer 5 is not particularly limited, and may be a firing method, a spray coating method (such as a thermal spray method, an aerosol deposition method, an aerosol gas deposition method, a powder jet deposition method, a particle jet deposition method, or a cold spray method), a PVD method (such as a sputtering method or a pulsed laser deposition method), or a CVD method.

[0036] [Hydrogen electrode layer 6] The hydrogen electrode layer 6 is an example of a "first electrode layer" according to the present invention. The hydrogen electrode layer 6 is formed on the gas diffusion layer 5. The hydrogen electrode layer 6 is disposed between the gas diffusion layer 5 and the electrolyte layer 7.

[0037] A source gas is supplied to the hydrogen electrode layer 6 from each of the communication holes 11 via the gas diffusion layer 5. The source gas contains at least H2O.

[0038] When the raw material gas contains only H2O, the hydrogen electrode layer 6 produces H2 from the raw material gas in accordance with the electrochemical reaction of water electrolysis shown in the following formula (1).

[0039] Hydrogen electrode layer 6: H2O+2e - →H2+O 2- (1)

[0040] When the raw gas contains CO in addition to H2O, the hydrogen electrode layer 6 converts H2, CO, and O2 from the raw gas in accordance with the electrochemical reactions of co-electrolysis shown in the following formulas (2), (3), and (4). 2- Generate.

[0041] Hydrogen electrode layer 6: CO2+H2O+4e - →CO+H2+2O 2- (2) Electrochemical reaction of H2O: H2O+2e - →H2+O 2- (3) Electrochemical reaction of CO2: CO2+2e - →CO+O 2- (4)

[0042] The hydrogen electrode layer 6 is a porous body having gas diffusibility and electrical conductivity. A source gas is supplied to the hydrogen electrode layer 6 from the gas diffusion layer 5. The product gas generated in the hydrogen electrode layer 6 is discharged to the gas diffusion layer 5 side.

[0043] The hydrogen electrode layer 6 includes a conductive material. Examples of the conductive material that can be used include metal materials such as Ni (nickel) and Fe (iron), and conductive ceramic materials. In the case of co-electrolysis, Ni also functions as a thermal catalyst that promotes the thermal reaction between the generated H2 and the CO2 contained in the raw gas to maintain an appropriate gas composition for methanation, reverse water gas shift reaction, and the like.

[0044] The conductive material exists in an oxide state (e.g., NiO) in an oxidizing atmosphere and in a metallic state (e.g., Ni) in a reducing atmosphere. In this embodiment, it is assumed that the electrolysis cell 1 is exposed to a reducing atmosphere.

[0045] The hydrogen electrode layer 6 includes an oxide ion conductive material such as YSZ, CSZ, ScSZ, GDC, SDC, (La,Sr)(Cr,Mn)O3, (La,Sr)TiO3, Sr2(Fe,Mo)2O6, (La,Sr)VO3, (La,Sr)FeO3, LDC, LSGM, or a mixture of two or more of these materials.

[0046] In this embodiment, the hydrogen electrode layer 6 has a single-layer structure made of a single composition, but may have a multi-layer structure made of different compositions.

[0047] The porosity of the hydrogen electrode layer 6 is not particularly limited, but may be, for example, 20% or more and 40% or less. The porosity of the hydrogen electrode layer 6 is calculated by dividing the total area of ​​the pores by the total area of ​​the backscattered electron image of the hydrogen electrode layer 6, similar to the porosity of the gas diffusion layer 5 described above.

[0048] The thickness of the hydrogen electrode layer 6 is not particularly limited, but may be, for example, 5 μm or more and 500 μm or less.

[0049] Here, Fig. 3 is a partially enlarged view of Fig. 2. As shown in Fig. 3, the hydrogen electrode layer 6 includes a plurality of pores 61 and a plurality of fine particles 62.

[0050] In the cross section of the hydrogen electrode layer 6, the multiple pores 61 are arranged so as to be dispersed within the hydrogen electrode layer 6. The shape and size of each pore 61 are not particularly limited, and each pore 61 may be different.

[0051] The average equivalent circular diameter of the pores 61 is not particularly limited, but may be, for example, 20 μm or more and 40 μm or less. The average equivalent circular diameter of the pores 61 is obtained by arithmetically averaging the equivalent circular diameters of 30 pores 61 randomly selected from a backscattered electron image of the cross section of the hydrogen electrode layer 6. The equivalent circular diameter of a pore 61 is the area of ​​a circle having the same area as the pore 61.

[0052] 3, the multiple pores 61 include nearby pores 61a located in the vicinity of the gas diffusion layer 5. Located in the vicinity of the gas diffusion layer 5 means that at least a part of the nearby pores 61a is located within 5 μm (see line 6T in FIG. 3) from the interface 6S between the gas diffusion layer 5 and the hydrogen electrode layer 6. Therefore, the nearby pores 61a may be in contact with the gas diffusion layer 5 or may be separated from the gas diffusion layer 5.

[0053] The particles 62 are disposed in the nearby pores 61a. The particles 62 exist independently in the nearby pores 61a. "Existing independently" means that the particles 62 are not fixed to the inner surface of the pores 61. However, the particles 62 may be in contact with the inner surface of the pores 61. When the particles 62 are in contact with the inner surface of the pores 61, it can be confirmed that the particles 62 are not fixed to the inner surface of the pores 61 by observing no neck (e.g., a neck formed by sintering) between the inner surface of the pores 61 and the outer surface of the particles 62.

[0054] In this way, the independent presence of the fine particles 62 in the nearby pores 61a can suppress the occurrence of cracks in the hydrogen electrode layer 6, as will be described below.

[0055] The shear stress generated between the gas diffusion layer 5 and the hydrogen electrode layer 6 due to the difference in thermal expansion coefficient between the metal support 10 and the cell body 20 is absorbed by deformation of the nearby pores 61a of the hydrogen electrode layer 6. If the fine particles 62 were not present, the nearby pores 61a would be excessively deformed if the shear stress was large, resulting in cracks around the nearby pores 61a.

[0056] On the other hand, in this embodiment, the fine particles 62 are present independently in the nearby pores 61a. As shown in FIG. 4, the fine particles 62 are sandwiched inside the nearby pores 61a, thereby supporting the nearby pores 61a from the inside so that the nearby pores 61a do not deform excessively. This makes it possible to suppress the occurrence of cracks around the nearby pores 61a. In particular, since the fine particles 62 are not fixed to the inner surface of the nearby pores 61a, the fine particles 62 can move freely within the nearby pores 61a in response to the deformation of the nearby pores 61a. Therefore, no matter in what direction the nearby pores 61a deform, the fine particles 62 can support the nearby pores 61a from the inside.

[0057] The material of the microparticles 62 is not particularly limited, and may be, for example, ceramic particles, metal particles, etc. Examples of the ceramic particles include NiO particles, F2O3 particles, etc. Examples of the metal particles include Ni particles, Fe particles, etc. In particular, when the microparticles 62 are metal particles having ductility, it is preferable because the microparticles 62 can absorb shear stress by deformation. Examples of the metal particles having ductility include Ni particles, Fe particles, Co particles, etc.

[0058] The particle size of the particles 62 is not particularly limited, but can be, for example, 0.1 μm or more and 5 μm or less. The number of particles 62 arranged in the nearby pores 61a is not particularly limited, and may be 1 or more. However, if the nearby pores 61a are entirely filled with particles 62, the nearby pores 61a will be deformed and will not easily absorb shear stress, so it is preferable that the particles 62 are present only in some of the nearby pores 61a.

[0059] The method for forming the hydrogen electrode layer 6 is not particularly limited, and may be a sintering method, a spray coating method, a PVD method, a CVD method, or the like. For example, when forming the hydrogen electrode layer 6 by a sintering method, the green body of the hydrogen electrode layer 6 may be formed by applying a slurry containing the pore-forming material in which the fine particles 62 are embedded and the constituent material of the hydrogen electrode layer 6 onto the green body of the gas diffusion layer 5, and then applying a slurry containing the pore-forming material and the constituent material of the hydrogen electrode layer 6. In the step of sintering the green body of the hydrogen electrode layer 6, the pore-forming material in which the fine particles 62 are embedded disappears leaving the fine particles 62 behind, and nearby pores 61a containing the fine particles 62 are formed.

[0060] [Electrolyte layer 7] The electrolyte layer 7 is disposed between the hydrogen electrode layer 6 and the oxygen electrode layer 9. In this embodiment, the reaction prevention layer 8 is disposed between the electrolyte layer 7 and the oxygen electrode layer 9, so that the electrolyte layer 7 is sandwiched between the hydrogen electrode layer 6 and the reaction prevention layer 8.

[0061] The electrolyte layer 7 covers the hydrogen electrode layer 6 and also covers the region of the first main surface 12 of the metal support 10 that is exposed from the gas diffusion layer 5 .

[0062] The electrolyte layer 7 is formed by discharging the O 2- to the oxygen electrode layer 9. The electrolyte layer 7 is made of a dense material having oxide ion conductivity. The electrolyte layer 7 can be made of, for example, YSZ (yttria-stabilized zirconia, e.g., 8YSZ), GDC (gadolinium-doped ceria), ScSZ (scandia-stabilized zirconia), SDC (samarium-doped ceria), LSGM (lanthanum gallate), or the like.

[0063] The porosity of the electrolyte layer 7 is not particularly limited, but may be, for example, 0.1% to 7%. The thickness of the electrolyte layer 7 is not particularly limited, but may be, for example, 1 μm to 100 μm.

[0064] The method for forming the electrolyte layer 7 is not particularly limited, and a baking method, a spray coating method, a PVD method, a CVD method, or the like can be used.

[0065] [Reaction prevention layer 8] The reaction prevention layer 8 is disposed between the electrolyte layer 7 and the oxygen electrode layer 9. The reaction prevention layer 8 is disposed on the opposite side of the electrolyte layer 7 to the hydrogen electrode layer 6. The reaction prevention layer 8 prevents the constituent elements of the electrolyte layer 7 from reacting with the constituent elements of the oxygen electrode layer 9 to form a layer with high electrical resistance.

[0066] The reaction prevention layer 8 is made of an oxide ion conductive material, and may be made of GDC, SDC, or the like.

[0067] The porosity of the reaction prevention layer 8 is not particularly limited, but may be, for example, 0.1% to 50%. The thickness of the reaction prevention layer 8 is not particularly limited, but may be, for example, 1 μm to 50 μm.

[0068] The method for forming the reaction prevention layer 8 is not particularly limited, and a baking method, a spray coating method, a PVD method, a CVD method, or the like can be used.

[0069] [Oxygen electrode layer 9] The oxygen electrode layer 9 is an example of a "second electrode layer" according to the present invention. The oxygen electrode layer 9 is disposed on the opposite side of the hydrogen electrode layer 6 with respect to the electrolyte layer 7. In this embodiment, the reaction prevention layer 8 is disposed between the electrolyte layer 7 and the oxygen electrode layer 9, and therefore the oxygen electrode layer 9 is connected to the reaction prevention layer 8. If the reaction prevention layer 8 is not disposed between the electrolyte layer 7 and the oxygen electrode layer 9, the oxygen electrode layer 9 is connected to the electrolyte layer 7.

[0070] The oxygen electrode layer 9 reacts with O 2 transferred from the hydrogen electrode layer 6 through the electrolyte layer 7 in accordance with the chemical reaction of the following formula (5): 2- produces O2 from

[0071] Oxygen electrode layer 9:2O 2- →O2+4e - (5) The oxygen electrode layer 9 is a porous body having oxide ion conductivity and electrical conductivity. The oxygen electrode layer 9 can be made of a composite material of one or more of (La,Sr)(Co,Fe)O3, (La,Sr)FeO3, La(Ni,Fe)O3, (La,Sr)CoO3, and (Sm,Sr)CoO3 and an oxide ion conductive material (such as GDC).

[0072] The porosity of the oxygen electrode layer 9 is not particularly limited, but may be, for example, 20% to 60%. The thickness of the oxygen electrode layer 9 is not particularly limited, but may be, for example, 1 μm to 100 μm.

[0073] The method for forming the oxygen electrode layer 9 is not particularly limited, and a baking method, a spray coating method, a PVD method, a CVD method, or the like can be used.

[0074] [Flow path member 30] The flow path member 30 is joined to the second main surface 13 of the metal support 10. The flow path member 30 forms a flow path 30a between itself and the metal support 10. A source gas is supplied to the flow path 30a. The source gas supplied to the flow path 30a is supplied to the hydrogen electrode layer 6 of the cell main body 20 through each communication hole 11 of the metal support 10.

[0075] The flow path member 30 can be made of, for example, an alloy material. The flow path member 30 may be formed of the same material as the metal support 10. In this case, the flow path member 30 may be substantially integral with the metal support 10.

[0076] The flow path member 30 has a frame 31 and an interconnector 32. The frame 31 is an annular member that surrounds the side of the flow path 30a. The frame 31 is joined to the second main surface 13 of the metal support 10. The interconnector 32 is a plate-like member for electrically connecting an external power source or another electrolysis cell to the electrolysis cell 1 in series. The interconnector 32 is joined to the frame 31.

[0077] In this embodiment, the frame 31 and the interconnector 32 are separate members, but the frame 31 and the interconnector 32 may be an integrated member.

[0078] (Modification of the embodiment) Although the embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications are possible without departing from the spirit of the present invention.

[0079] [Variation 1] In the above embodiment, the microparticles 62 are arranged inside the nearby pores 61a among the multiple pores 61 of the hydrogen electrode layer 6, but the microparticles 62 may also be arranged inside the pores 61 other than the nearby pores 61a among the multiple pores 61.

[0080] [Variation 2] In the above embodiment, the openings of each communication hole 11 on the first main surface 12 side of the metal support 10 are covered by the gas diffusion layer 5, but this is not limited thereto. The gas diffusion layer 5 does not have to cover the openings of each communication hole 11 on the first main surface 12 side. In this case, the gas diffusion layer 5 has through holes communicating with each communication hole 11, so that gas can be supplied and exhausted more efficiently through the through holes.

[0081] [Variation 3] In the above embodiment, the electrolysis cell 1 has been described as an example of an electrochemical cell, but the electrochemical cell is not limited to the electrolysis cell. An electrochemical cell is a general term for an element in which a pair of electrodes are arranged so that an electromotive force is generated from an overall oxidation-reduction reaction in order to convert electrical energy into chemical energy, and an element for converting chemical energy into electrical energy. Therefore, the electrochemical cell includes, for example, a fuel cell that uses oxide ions or protons as a carrier. [Explanation of symbols]

[0082] 1 Electrolysis cell 10 Metal support 11 Communication hole 12 First main surface 13 Second main surface 20 Cell body 5 Gas diffusion layer 6 Hydrogen electrode layer 61 Stoma 61a Nearby pore 62 Fine particles 7 Electrolyte layer 8. Reaction prevention layer 9 Oxygen Polar Layer 30 Flow path member 30a Flow path

Claims

1. a metal support having a plurality of communicating holes formed on a main surface thereof; A cell main body portion disposed on the main surface; Equipped with The cell body portion is a conductive gas diffusion layer disposed on the main surface; a first electrode layer disposed on the gas diffusion layer; A second electrode layer; an electrolyte layer disposed between the first electrode layer and the second electrode layer; having the first electrode layer has adjacent pores located in the vicinity of the gas diffusion layer, and fine particles independently present in the adjacent pores; Electrochemical cell.

2. The fine particles are metal particles.

10. The electrochemical cell of claim 1.

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