Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/02—Details
  • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
  • H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
  • H01M8/0256—Vias, i.e. connectors passing through the separator material
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/02—Details
  • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
  • H01M8/0204—Non-porous and characterised by the material
  • H01M8/0223—Composites
  • H01M8/0228—Composites in the form of layered or coated products
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
  • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
  • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
  • H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
  • H01M8/04126—Humidifying
  • H01M8/04149—Humidifying by diffusion, e.g. making use of membranes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/30—Hydrogen technology
  • Y02E60/50—Fuel cells

Definitions

• the present invention relates to an electrochemical cell.
• electrochemical cells electrolysis cells, fuel cells, etc.
• the metal support has a plurality of communication holes formed on its main surface.
• the cell body portion 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.
• Patent document 1 describes inserting a conductive gas diffusion layer between the cell body and the metal support.
• the objective of the present invention is to provide an electrochemical cell that can suppress peeling of the gas diffusion layer.
• the electrochemical cell according to the first aspect of the present invention comprises a metal support having a plurality of communicating holes formed in 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.
• at least a portion of the outer edge of the gas diffusion layer has a wave shape in which peaks and valleys are alternately arranged in succession.
• the electrochemical cell according to the second aspect of the present invention is the same as the first aspect, and in a plan view of the main surface, the peaks protrude in a curved shape in a direction away from the plurality of communication holes, and in a plan view of the main surface, the valleys are recessed in a curved shape in a direction approaching the plurality of communication holes.
• the electrochemical cell according to the third aspect of the present invention is the electrochemical cell according to the second aspect, and in a plan view of the main surface, the distance between the outermost communicating hole located at the outermost end in the surface direction among the plurality of communicating holes and the bottom point of the valley portion is shorter than the distance between the outermost communicating hole and the apex of the peak portion.
• the electrochemical cell according to the fourth aspect of the present invention relates to the third aspect, and in a plan view of the main surface, the second perpendicular line intersects with an inner communication hole that is arranged one stage inward from the outermost communication hole among the plurality of communication holes.
• the present invention provides an electrochemical cell that can suppress peeling of the gas diffusion layer.
• FIG. 1 is a plan view of an electrolysis cell according to an embodiment.
• FIG. 2 is a cross-sectional view taken along line AA of FIG.
• FIG. 3 is a plan view showing a state in which the hydrogen electrode layer, the electrolyte layer, the reaction prevention layer, and the oxygen electrode layer have been removed from the electrolysis cell according to the embodiment.
• FIG. 4 is a partially enlarged view of FIG.
• FIG. 1 is a plan view of an electrolysis cell 1 according to an embodiment of the present invention
• Fig. 2 is a cross-sectional view taken along line AA of Fig. 1.
• Electrolytic cell 1 is an example of an "electrochemical cell” according to the present invention. Electrolytic cell 1 is a so-called metal-supported electrolytic cell.
• the electrolytic cell 1 is formed in a plate shape extending in the X-axis and Y-axis directions.
• the electrolytic 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.
• the planar shape of the electrolytic cell 1 is not particularly limited, and may be a polygon other than a rectangle, an ellipse, a circle, etc.
• the electrolysis cell 1 includes a metal support 10, a cell body 20, and a flow path member 30.
• 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.
• the metal support 10 only needs to be able to support the cell body 20, and there are no particular limitations on its thickness, but it can be, for example, 0.1 mm or more and 2.0 mm or less.
• the metal support 10 has a plurality of communication holes 11, a first main surface 12, and a second main surface 13.
• 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 the first main surface 12 and the second main surface 13.
• 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.
• Each communication hole 11 can be formed by mechanical processing (e.g., punching), laser processing, or chemical processing (e.g., etching).
• each communication hole 11 is formed linearly along the Z-axis direction.
• each communication hole 11 may be inclined with respect to the Z-axis direction, and may not be linear.
• the communication holes 11 may be connected to each other.
• 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 of the second main surface 13.
• the cell main body 20 is disposed on the first main surface 12.
• the flow path member 30 is bonded to the second main surface 13.
• the metal support 10 is made of a metal material.
• 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.
• Cr content in the metal support 10 can be 4% by mass or more and 30% by mass or less.
• the metal support 10 may contain Ti (titanium) and 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) and Zr as ZrO2 (zirconia).
• the metal support 10 may have an oxide film on its surface that 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 communication hole 11.
• 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).
• the gas diffusion layer 5, hydrogen electrode layer 6, electrolyte layer 7, reaction prevention layer 8, and oxygen electrode layer 9 are stacked 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 required components, while the reaction prevention layer 8 is optional.
• the gas diffusion layer 5 is formed on the first main surface 12 of the metal support 10.
• the gas diffusion layer 5 is interposed between the metal support 10 and the hydrogen electrode layer 6.
• the gas diffusion layer 5 covers each of the communication holes 11 of the metal support 10. A portion of the gas diffusion layer 5 may extend into each of the communication holes 11 of the metal support 10.
• the gas diffusion layer 5 is a porous body having gas diffusivity and electrical conductivity.
• the gas diffusion layer 5 supplies the raw gas supplied from each communication hole 11 to the hydrogen electrode layer 6, and discharges the product gas generated in the hydrogen electrode layer 6 to each communication hole 11.
• the gas diffusion layer 5 includes a conductive material.
• the conductive material that can be used include metal materials such as Ni (nickel) and Fe (iron), and conductive ceramic materials.
• the gas diffusion layer 5 may include a substrate supporting a conductive material.
• the substrate may be insulating.
• As the substrate YSZ, CSZ, ScSZ, GDC, SDC, (La, Sr) (Cr, Mn) O 3 , (La, Sr) TiO 3 , Sr 2 (Fe, Mo) 2 O 6 , (La, Sr) VO 3 , (La, Sr) FeO 3 , LDC (lanthanum doped ceria), LSGM (lanthanum gallate), and a mixed material of two or more of these may be used.
• the gas diffusion layer 5 may contain metal elements 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 conductive material described above is different from the metal elements 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.
• the porosity of the gas diffusion layer 5 is not particularly limited, but can be, for example, 20% or more and 40% or less.
• the porosity of the gas diffusion layer 5 is calculated by the following method. First, a cross section of the gas diffusion layer 5 along the Z-axis direction is exposed. 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 areas displayed in black in the backscattered electron image (corresponding to pores) are identified using image analysis software Image-Pro manufactured by MEDIACYBERNETICS. The porosity of the gas diffusion layer 5 is then calculated by dividing the total area of the pores by the total area of the backscattered electron images of the gas diffusion layer 5.
• the thickness of the gas diffusion layer 5 is not particularly limited, but can be, for example, 1 ⁇ m or more and 50 ⁇ m or less.
• the thickness means the thickness in the thickness direction of the cell body 20.
• the thickness direction is the direction perpendicular to the surface direction parallel to the first main surface 12 of the metal support 10.
• an approximation straight line of the first main surface 12 obtained by the least squares method in the cross section of the metal support 10 along the Z-axis direction is used.
• the method for forming the gas diffusion layer 5 is not particularly limited, and may be a firing method, a spray coating method (thermal spraying, aerosol deposition, aerosol gas deposition, powder jet deposition, particle jet deposition, cold spray, etc.), a PVD method (sputtering, pulsed laser deposition, etc.), a CVD method, etc.
• 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.
• 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 .
• the hydrogen electrode layer 6 produces H 2 from the source gas in accordance with the electrochemical reaction of water electrolysis shown in the following formula (1).
• Hydrogen electrode layer 6 H 2 O+2e ⁇ ⁇ H 2 +O 2 ⁇ (1)
• the hydrogen electrode layer 6 produces H 2 , CO, and O 2 ⁇ from the source gas in accordance with the co-electrochemical reactions shown in the following formulas (2), (3), and (4).
• Hydrogen electrode layer 6 CO 2 + H 2 O + 4e ⁇ ⁇ CO + H 2 + 2O 2 ⁇ (2) Electrochemical reaction of H 2 O: H 2 O + 2e ⁇ ⁇ H 2 + O 2 ⁇ (3) Electrochemical reaction of CO2 : CO2 + 2e- ⁇ CO + O2 -... (4)
• the hydrogen electrode layer 6 is a porous body having gas diffusibility and electrical conductivity.
• the raw material 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.
• the hydrogen electrode layer 6 includes a conductive material.
• a conductive material metal materials such as Ni (nickel) and Fe (iron), conductive ceramic materials, etc. can be used.
• Ni nickel
• Fe iron
• conductive ceramic materials etc.
• Ni also functions as a thermal catalyst that promotes the thermal reaction between the generated H 2 and CO 2 contained in the raw material gas to maintain an appropriate gas composition for methanation, reverse water gas shift reaction, etc.
• 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.
• an oxide state e.g., NiO
• a metallic state e.g., Ni
• the hydrogen electrode layer 6 includes an oxide ion conductive material such as YSZ, CSZ, ScSZ, GDC, SDC, (La, Sr) (Cr, Mn) O 3 , (La, Sr) TiO 3 , Sr 2 (Fe, Mo) 2 O 6 , (La, Sr) VO 3 , (La, Sr) FeO 3 , LDC, LSGM, or a mixture of two or more of these materials.
• oxide ion conductive material such as YSZ, CSZ, ScSZ, GDC, SDC, (La, Sr) (Cr, Mn) O 3 , (La, Sr) TiO 3 , Sr 2 (Fe, Mo) 2 O 6 , (La, Sr) VO 3 , (La, Sr) FeO 3 , LDC, LSGM, or a mixture of two or more of these materials.
• the hydrogen electrode layer 6 has a single-layer structure made of a single composition, but it may have a multi-layer structure made of different compositions.
• the porosity of the hydrogen electrode layer 6 is not particularly limited, but can 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.
• the thickness of the hydrogen electrode layer 6 is not particularly limited, but can be, for example, 1 ⁇ m or more and 500 ⁇ m or less.
• the method for forming the hydrogen electrode layer 6 is not particularly limited, and methods such as firing, spray coating, PVD, and CVD can be used.
• the electrolyte layer 7 is disposed between the hydrogen electrode layer 6 and the oxygen electrode layer 9.
• 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.
• the electrolyte layer 7 covers the hydrogen electrode layer 6 and also covers the area of the first main surface 12 of the metal support 10 that is exposed from the gas diffusion layer 5.
• the electrolyte layer 7 transfers O 2- generated in the hydrogen electrode layer 6 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.
• the porosity of the electrolyte layer 7 is not particularly limited, but can be, for example, 0.1% to 7%.
• the thickness of the electrolyte layer 7 is not particularly limited, but can be, for example, 1 ⁇ m to 100 ⁇ m.
• the method for forming the electrolyte layer 7 is not particularly limited, and methods such as baking, spray coating, PVD, and CVD can be used.
• 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.
• the reaction prevention layer 8 is made of an oxide ion conductive material.
• the reaction prevention layer 8 can be made of GDC, SDC, etc.
• the porosity of the reaction prevention layer 8 is not particularly limited, but can be, for example, 0.1% to 50%.
• the thickness of the reaction prevention layer 8 is not particularly limited, but can be, for example, 1 ⁇ m to 50 ⁇ m.
• 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, etc. can be used.
• 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.
• 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 would be connected to the electrolyte layer 7.
• the oxygen electrode layer 9 produces O 2 from O 2 ⁇ transferred from the hydrogen electrode layer 6 via the electrolyte layer 7 in accordance with the chemical reaction of the following formula (5).
• Oxygen electrode layer 9 2O 2 ⁇ ⁇ O 2 +4e ⁇ (5)
• the oxygen electrode layer 9 is a porous body having oxide ion conductivity and electrical conductivity, and may 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).
• the porosity of the oxygen electrode layer 9 is not particularly limited, but can be, for example, 20% or more and 60% or less.
• the thickness of the oxygen electrode layer 9 is not particularly limited, but can be, for example, 1 ⁇ m or more and 100 ⁇ m or less.
• the method for forming the oxygen electrode layer 9 is not particularly limited, and a firing method, a spray coating method, a PVD method, a CVD method, etc. can be used.
• 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.
• the flow path member 30 can be made of, for example, an alloy material.
• the flow path member 30 may be made 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.
• the flow path member 30 has a frame body 31 and an interconnector 32.
• the frame body 31 is an annular member that surrounds the side of the flow path 30a.
• the frame body 31 is joined to the second main surface 13 of the metal support body 10.
• the interconnector 32 is a plate-shaped member for electrically connecting an external power source or another electrolysis cell in series with the electrolysis cell 1.
• the interconnector 32 is joined to the frame body 31.
• the frame body 31 and the interconnector 32 are separate members, but the frame body 31 and the interconnector 32 may be an integrated member.
• FIG. 3 is a plan view of the electrolysis cell 1 with the hydrogen electrode layer 6, electrolyte layer 7, reaction prevention layer 8, and oxygen electrode layer 9 removed from the cell body 20.
• Fig. 4 is a partially enlarged view of Fig. 3.
• the gas diffusion layer 5 covers the multiple communication holes 11 of the metal support 10.
• the planar shape of the gas diffusion layer 5 is rectangular overall, but is not limited to this.
• the planar shape of the gas diffusion layer 5 can be changed as appropriate taking into account the planar shape of the cell body 20 and the planar shape of the area in which the multiple communication holes 11 are formed.
• the multiple communication holes 11 in the metal support 10 are arranged in a staggered pattern. This makes it possible to easily increase the density of the communication holes 11. However, the arrangement of the communication holes 11 can be changed as appropriate.
• the outer edge 5a of the gas diffusion layer 5 has a wave shape in which peaks 51 and valleys 52 are alternately arranged.
• the stress applied to the outer edge 5a can be dispersed in the surface direction.
• the total length of the outer edge 5a can be made longer than when the outer edge 5a has a straight shape. As a result, the stress applied to the outer edge 5a can be alleviated, and peeling of the gas diffusion layer 5 from the metal support 10 can be suppressed.
• the entire outer edge 5a is wavy, but it is sufficient that at least a portion of the outer edge 5a of the gas diffusion layer 5 is wavy. Even in this case, the wavy area of the outer edge 5a can prevent the gas diffusion layer 5 from peeling off from the metal support 10, as described above. Therefore, a portion of the outer edge 5a may be straight.
• the peaks 51 of the outer edge 5a protrude in a curved shape away from the communication holes 11, and the valleys 52 of the outer edge 5a are recessed in a curved shape toward the communication holes 11.
• the outer edge 5a has a curved wave shape. This allows the stress applied to the outer edge 5a to be dispersed in the surface direction and the overall length of the outer edge 5a to be longer than when the outer edge 5a has a linear wave shape (sawtooth shape). As a result, the stress applied to the outer edge 5a can be further alleviated, and peeling of the gas diffusion layer 5 from the metal support 10 can be further suppressed.
• the metal support 10 is provided with a plurality of communication holes 11, and the heat conduction in the plane of the metal support 10 is interrupted by each communication hole 11, so that a temperature distribution is likely to occur in the metal support 10.
• heat is absorbed and generated from the cell main body 20 during operation of the electrolysis cell 1, heat is exchanged by heating or dissipating heat to the cell main body 20, so that a temperature distribution is likely to occur in the outer periphery of the cell main body 20.
• the communication holes 11 arranged on the outermost periphery are the communication holes 11 that are located at the outermost ends in the planar direction (X-axis direction or Y-axis direction) among the multiple communication holes 11.
• the positions of the communication holes 11 arranged on the outermost periphery coincide with the positions of the valleys 52.
• a first perpendicular line M1 that is perpendicular to a first tangent line L1 that touches the valley bottom point 52b of the valleys 52 and passes through the valley bottom point 52b intersects with the outermost peripheral communication hole 11a.
• a second perpendicular line M2 that is perpendicular to a second tangent line L2 that touches the apex 51a of the peak portion 51 and passes through the apex 51a does not intersect with the outermost peripheral communication hole 11a.
• the position of the communication hole 11 (hereinafter referred to as the "inner communication hole 11b") arranged one step inward from the outermost peripheral communication hole 11a coincides with the position of the peak 51.
• the second perpendicular line M2 passing through the apex 51a of the peak 51 intersects with the inner communication hole 11b.
• the first perpendicular line M1 passing through the bottom point 52b of the valley 52 does not intersect with the inner communication hole 11b.
• the "inside” of the inner communication hole 11b means the opposite side of the outer edge 5a with respect to the position of the outermost communication hole 11a in the direction parallel to the second perpendicular line M2.
• the distance D1 between the outermost peripheral communicating hole 11a and the bottom point 52b of the valley portion 52 is shorter than the distance D2 between the outermost peripheral communicating hole 11a and the apex 51a of the peak portion 51.
• the distance D1 is the shortest distance between the outermost peripheral communicating hole 11a and the bottom point 52b in a direction parallel to the first perpendicular line M1.
• the distance D2 is the shortest distance between the outermost peripheral communicating hole 11a and the apex 51a in a direction parallel to the first perpendicular line M1.
• the distance D3 between the inner communication hole 11b and the apex 51a of the peak 51 is longer than the distance D2 between the outermost communication hole 11a and the apex 51a of the peak 51.
• Distance D3 is the shortest distance between the inner communication hole 11b and the apex 51a in a direction parallel to the first perpendicular line M1.
• the value of the distance D1 is not particularly limited, but can be, for example, 0.20 mm or more and 1.0 mm or less.
• the value of the distance D2 is not particularly limited, but can be, for example, 0.25 mm or more and 2.0 mm or less.
• the value of the distance D3 is not particularly limited, but can be, for example, 0.50 mm or more and 3.0 mm or less.
• the value of the distance D4 between the vertices 51a in the direction parallel to the first tangent L1 is not particularly limited, but can be, for example, 0.20 mm or more and 5.0 mm or less.
• the value of the distance D5 between the valley points 52b in the direction parallel to the first tangent line L1 is not particularly limited, but can be, for example, 0.20 mm or more and 5.0 mm or less.
• 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.
• 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.
• the hydrogen electrode layer 6 functions as a cathode and the oxygen electrode layer 9 functions as an anode, but the arrangement of the hydrogen electrode layer 6 and the oxygen electrode layer 9 may be reversed.
• 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.
• Electrolysis cell 10 Metal support 11 Through hole 12 First main surface 13 Second main surface 20 Cell body 5 Gas diffusion layer 5a Outer edge 51 Peak 51a Peak 52 Valley 52b Valley bottom point 6 Hydrogen electrode layer 7 Electrolyte layer 8 Reaction prevention layer 9 Oxygen electrode layer 30 Flow path member 30a Flow path La First tangent Ma First perpendicular Lb Second tangent Mb Second perpendicular

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• 2023
  • 2023-03-30 JP JP2024514726A patent/JP7752236B2/ja active Active
  • 2023-03-30 WO PCT/JP2023/013170 patent/WO2024201893A1/ja not_active Ceased
  • 2023-03-30 CN CN202380013561.2A patent/CN120936756A/zh active Pending
  • 2023-03-30 DE DE112023000202.9T patent/DE112023000202T5/de active Pending
• 2024
  • 2024-03-08 US US18/599,747 patent/US20240332566A1/en active Pending

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