WO2023171276A1 - 電気化学セル - Google Patents

電気化学セル Download PDF

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Publication number
WO2023171276A1
WO2023171276A1 PCT/JP2023/005285 JP2023005285W WO2023171276A1 WO 2023171276 A1 WO2023171276 A1 WO 2023171276A1 JP 2023005285 W JP2023005285 W JP 2023005285W WO 2023171276 A1 WO2023171276 A1 WO 2023171276A1
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WO
WIPO (PCT)
Prior art keywords
layer
metal support
electrode layer
electrolyte layer
electrochemical cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/005285
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English (en)
French (fr)
Japanese (ja)
Inventor
春香 千葉
俊之 中村
玄太 寺澤
誠 大森
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NGK Insulators Ltd
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NGK Insulators Ltd
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Publication date
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Priority to JP2024505990A priority Critical patent/JP7625134B2/ja
Publication of WO2023171276A1 publication Critical patent/WO2023171276A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/23—Carbon monoxide or syngas
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/02—Diaphragms; Spacing elements characterised by shape or form
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/04—Diaphragms; Spacing elements characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/04—Diaphragms; Spacing elements characterised by the material
    • C25B13/05—Diaphragms; Spacing elements characterised by the material based on inorganic materials
    • C25B13/07—Diaphragms; Spacing elements characterised by the material based on inorganic materials based on ceramics
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
    • C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
    • C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/60—Constructional parts of cells
    • C25B9/63—Holders for electrodes; Positioning of the electrodes
    • 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
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • 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
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M8/1213—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting 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
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M8/1213—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material
    • H01M8/1226—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material characterised by the supporting layer
    • 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.
  • Patent Document 1 discloses an electrochemical cell including a cell main body in which a first electrode layer, an electrolyte layer, and a second electrode layer are laminated in this order on the main surface of a metal support.
  • the metal support has a supply hole for supplying gas to the first electrode layer.
  • metal supports have excellent mechanical strength, they have low heat retention properties, making it difficult to maintain the temperature of the cell body within an appropriate temperature range.
  • An object of the present invention is to provide an electrochemical cell that can improve heat retention.
  • the electrochemical cell according to the first aspect of the present invention includes a cell main body, a plate-shaped metal support, and a coating layer.
  • the cell main body includes a first electrode layer, a second electrode layer, and an electrolyte layer.
  • An electrolyte layer is disposed between the first electrode layer and the second electrode layer.
  • the metal support has a first main surface that supports the cell body and a plurality of supply holes.
  • the covering layer is made of a ceramic material and covers at least a portion of the side surface of the metal support.
  • the electrochemical cell according to the second aspect of the present invention is related to the first aspect, and the covering layer is connected to the electrolyte layer.
  • the electrochemical cell according to the third aspect of the present invention is related to the second aspect, in which the coating layer is integrally formed with the electrolyte layer, and the ceramic material is the same as the constituent material of the electrolyte layer.
  • the coating layer is discontinuous in a cross section perpendicular to the side surface of the metal support.
  • An electrochemical cell according to a fifth aspect of the present invention is related to the first aspect, in which the coating layer is separated from the electrolyte layer.
  • An electrochemical cell according to a sixth aspect of the present invention relates to any one of the first to fifth aspects, and is joined to the second main surface of the metal support to form a flow path between the metal support and the electrochemical cell.
  • a flow path member is provided, and at least a portion of the side surface of the flow path member is covered with a coating layer.
  • FIG. 1 is a sectional view showing the configuration of an electrolytic cell according to an embodiment.
  • FIG. 2 is an enlarged cross section perpendicular to the side surface of the metal support according to the embodiment.
  • FIG. 3 is a cross-sectional view showing the configuration of an electrolytic cell according to Modification Example 1.
  • FIG. 4 is a cross-sectional view showing the configuration of an electrolytic cell according to modification 2.
  • FIG. 1 is a sectional view showing the configuration of an electrolytic cell 1 according to an embodiment.
  • the electrolytic cell 1 is an example of an "electrochemical cell” according to the present invention.
  • the electrolytic cell 1 includes a cell main body 10, a metal support 20, a channel member 30, and a coating layer 40.
  • the cell main body 10 includes a hydrogen electrode layer 6 (cathode), an electrolyte layer 7, a reaction prevention layer 8, and an oxygen electrode layer 9 (anode).
  • the hydrogen electrode layer 6, the electrolyte layer 7, the reaction prevention layer 8, and the oxygen electrode layer 9 are laminated in this order from the metal support 20 side.
  • the hydrogen electrode layer 6, the electrolyte layer 7, and the oxygen electrode layer 9 are essential structures, and the reaction prevention layer 8 is an optional structure.
  • Hydrogen electrode layer 6 is arranged between metal support 20 and electrolyte layer 7. Hydrogen electrode layer 6 is supported by metal support 20 . Specifically, the hydrogen electrode layer 6 is arranged on the first main surface 20S of the metal support 20. The hydrogen electrode layer 6 covers a region of the first main surface 20S of the metal support 20 where the plurality of supply holes 21 are provided. The hydrogen electrode layer 6 may enter into each supply hole 21 .
  • the hydrogen electrode layer 6 is an example of the "first electrode layer" according to the present invention.
  • Raw material gas is supplied to the hydrogen electrode layer 6 through each supply hole 21 .
  • the source gas contains CO 2 and H 2 O.
  • the raw material gas is an example of a "gas" according to the present invention.
  • the hydrogen electrode layer 6 generates H 2 , CO, and O 2 ⁇ from the source gas according to the electrochemical reaction of co-electrolysis shown in equation (1) below.
  • ⁇ Hydrogen electrode layer 6 CO 2 +H 2 O+4e - ⁇ CO+H 2 +2O 2 -...(1)
  • the hydrogen electrode layer 6 is made of a porous material having electron conductivity.
  • the hydrogen electrode layer 6 may have oxide ion conductivity.
  • the hydrogen electrode layer 6 is made of, for example, 8 mol% yttria-stabilized zirconia (8YSZ), calcia-stabilized zirconia (CSZ), scandia-stabilized zirconia (ScSZ), gadolinium-doped ceria (GDC), samarium-doped ceria (SDC), (La ,Sr)(Cr,Mn) O3 , (La,Sr )TiO3, Sr2(Fe,Mo)2O6 , ( La ,Sr) VO3 , (La,Sr) FeO3 , and among these It can be composed of a mixed material combining two or more of them, or a composite of one or more of these and NiO.
  • the porosity of the hydrogen electrode layer 6 is not particularly limited, but can be, for example, 5% or more and 70% or less.
  • the thickness of the hydrogen electrode layer 6 is not particularly limited, but may be, for example, 1 ⁇ m or more and 100 ⁇ m or less.
  • the method for forming the hydrogen electrode layer 6 is not particularly limited, and may include a baking method, a spray coating method (thermal spray method, aerosol deposition method, aerosol gas deposition method, powder jet deposition method, particle jet deposition method, cold spray method, etc.) ), PVD method (sputtering method, pulsed laser deposition method, etc.), CVD method, etc. can be used.
  • a baking method a spray coating method (thermal spray method, aerosol deposition method, aerosol gas deposition method, powder jet deposition method, particle jet deposition method, cold spray method, etc.)
  • PVD method sputtering method, pulsed laser deposition method, etc.
  • CVD method etc.
  • Electrolyte layer 7 is arranged between hydrogen electrode layer 6 and oxygen electrode layer 9. Electrolyte layer 7 covers the entire hydrogen electrode layer 6 . The outer edge of the electrolyte layer 7 is joined to the first main surface 20S of the metal support 20. This ensures airtightness between the hydrogen electrode layer 6 side and the oxygen electrode layer 9 side, so there is no need to separately seal between the metal support 20 and the electrolyte layer 7.
  • the electrolyte layer 7 transmits 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, 8YSZ, LSGM (lanthanum gallate), GDC (gadolinium doped ceria), or the like.
  • the electrolyte layer 7 is a fired body made of a dense material that has ionic conductivity and no electronic conductivity.
  • the electrolyte layer 7 can be made of, for example, YSZ (8YSZ), GDC, ScSZ, SDC, LSGM (lanthanum gallate), or the like.
  • the porosity of the electrolyte layer 7 is not particularly limited, but can be, for example, 0.1% or more and 7% or less.
  • the thickness of the electrolyte layer 7 is not particularly limited, but may be, for example, 1 ⁇ m or more and 100 ⁇ m or less.
  • 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, etc. can be used.
  • Reaction prevention layer 8 is arranged between electrolyte layer 7 and oxygen electrode layer 9. The reaction prevention layer 8 is arranged on the opposite side of the hydrogen electrode layer 6 with the electrolyte layer 7 in between.
  • the reaction prevention layer 8 prevents the electrolyte layer 7 and the oxygen electrode layer 9 from reacting to form a reaction 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, or the like.
  • the porosity of the reaction prevention layer 8 is not particularly limited, but can be, for example, 0.1% or more and 50% or less.
  • the thickness of the reaction prevention layer 8 is not particularly limited, but may be, for example, 1 ⁇ m or more and 50 ⁇ m or less.
  • 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 arranged on the opposite side of the hydrogen electrode layer 6 with respect to the electrolyte layer 7. In this embodiment, since the electrolytic cell 1 includes the reaction prevention layer 8, the oxygen electrode layer 9 is disposed on the reaction prevention layer 8. When the electrolytic cell 1 does not include the reaction prevention layer 8, the oxygen electrode layer 9 is arranged on the electrolyte layer 7.
  • the oxygen electrode layer 9 is an example of a "second electrode layer" according to the present invention.
  • the oxygen electrode layer 9 generates O 2 from O 2 ⁇ transmitted from the hydrogen electrode layer 6 through the electrolyte layer 7 according to the chemical reaction of equation (2) below.
  • ⁇ Oxygen electrode layer 9 2O 2- ⁇ O 2 +4e - (2)
  • the oxygen electrode layer 9 is made of a porous material having oxide ion conductivity and electron conductivity.
  • the oxygen electrode layer 9 is made of, for example, (La,Sr)(Co,Fe) O3 , (La,Sr) FeO3 , La(Ni,Fe) O3 , (La,Sr) CoO3 , and (Sm,Sr). ) CoO 3 and an oxide ion conductive material (GDC, etc.).
  • 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 may be, for example, 1 ⁇ m or more and 100 ⁇ m or less.
  • the method of forming the oxygen electrode layer 9 is not particularly limited, and a baking method, a spray coating method, a PVD method, a CVD method, etc. can be used.
  • the metal support 20 supports the cell main body 10 .
  • the metal support 20 is formed into a plate shape.
  • the metal support 20 may have a flat plate shape or a curved plate shape.
  • the thickness of the metal support 20 is not particularly limited as long as it can maintain the strength of the electrolytic cell 1, and may be, for example, 0.1 mm or more and 2.0 mm or less.
  • the metal support 20 has a plurality of supply holes 21, a first main surface 20S, a second main surface 20T, and a side surface 20R.
  • Each supply hole 21 penetrates the metal support 20 from the first main surface 20S to the second main surface 20T. Each supply hole 21 opens to the first main surface 20S and the second main surface 20T. Each supply hole 21 is formed in a region of the first main surface 20S that is joined to the hydrogen electrode layer 6. The supply hole 21 is connected to a flow path 30a formed between the metal support 20 and the flow path member 30.
  • Each supply hole 21 can be formed by mechanical processing (for example, punching process), laser processing, chemical processing (for example, etching process), or the like.
  • each supply hole 21 may be a pore within the porous metal. Therefore, each supply hole 21 does not need to be formed perpendicular to the first main surface 20S and the second main surface 20T.
  • the cell main body portion 10 is joined to the first main surface 20S.
  • the flow path member 30 is joined to the second main surface 20T.
  • the first main surface 20S is provided on the opposite side of the second main surface 20T.
  • the side surface 20R is connected to each of the first main surface 20S and the second main surface 20T.
  • the side surface 20R may be perpendicular to the first main surface 20S and the second main surface 20T, or may be inclined relative to the first main surface 20S and the second main surface 20T.
  • the side surface 20R may be planar, or may be partially or entirely curved or bent, or may have an uneven surface.
  • the metal support 20 is made of a metal material.
  • the metal support 20 is made of an alloy material containing Cr (chromium).
  • Examples of such metal materials include Fe--Cr alloy steel (such as stainless steel) and Ni--Cr alloy steel.
  • the content of Cr in the metal support 20 is not particularly limited, but can be 4% by mass or more and 30% by mass or less.
  • the metal support 20 may contain Ti (titanium) or Zr (zirconium).
  • the content of Ti in the metal support 20 is not particularly limited, but can be set to 0.01 mol% or more and 1.0 mol% or less.
  • the content of Zr in the metal support 20 is not particularly limited, but can be set to 0.01 mol% or more and 0.4 mol% or less.
  • the metal support 20 may contain Ti as TiO 2 (titania) or Zr as ZrO 2 (zirconia).
  • the metal support 20 may have an oxide film formed by oxidation of the constituent elements of the metal support 20 on its surface.
  • a typical example of the oxide film is a chromium oxide film.
  • the oxide film partially or completely covers the surface of the metal support 20. Further, the oxide film may partially or entirely cover the inner wall surface of each supply hole 21.
  • the flow path member 30 is joined to the second main surface 20T of the metal support 20.
  • the channel member 30 forms a channel 30a between it and the metal support 20.
  • a raw material gas is supplied to the flow path 30a.
  • the raw material gas supplied to the flow path 30a is supplied to the hydrogen electrode layer 6 of the cell main body 10 via each supply hole 21 of the metal support 20.
  • the flow path member 30 can be made of an alloy material, for example.
  • the flow path member 30 may be formed of the same material as the metal support 20.
  • the channel member 30 may be substantially integral with the metal support 20.
  • the flow path member 30 has a side surface 30R.
  • the side surface 30R of the channel member 30 is connected to the side surface 20R of the metal support 20.
  • the side surface 30R of the channel member 30 may be inclined with respect to the side surface 20R of the metal support 20.
  • the flow path member 30 has a frame 31 and an interconnector 32.
  • the frame body 31 is an annular member that surrounds the sides of the flow path 30a.
  • the frame 31 is joined to the second main surface 20T of the metal support 20.
  • the interconnector 32 is a plate-like member that electrically connects the electrolytic cell 1 to an external power source or other electrolytic cells in series.
  • the interconnector 32 is joined to the frame 31.
  • the frame 31 and the interconnector 32 are separate members, but the frame 31 and the interconnector 32 may be integrated.
  • the covering layer 40 is made of a ceramic material.
  • the coating layer 40 covers the side surface 20R of the metal support 20. Thereby, heat radiation from the metal support 20 can be suppressed, so that the heat retention of the electrolytic cell 1 can be improved. As a result, it becomes easier to maintain the temperature of the cell main body 10 and the source gas within an appropriate temperature range.
  • the coating layer 40 preferably covers the entire side surface 20R of the metal support 20, but may partially cover the side surface 20R of the metal support 20.
  • Ceramic materials constituting the coating layer 40 include, in addition to the constituent materials of the electrolyte layer 7, reaction prevention layer 8, and oxygen electrode layer 9, perovskite-type composite oxides containing La and Sr, Mn, Co, Ni, and Fe. , a spinel type composite oxide composed of transition metals such as Cu, glass materials, etc. can be used.
  • the covering layer 40 may be a laminate in which two or more of these materials are laminated.
  • the coating layer 40 is made of a material different from the oxide film (eg, chromium oxide film) formed on the surface of the metal support 20. That is, the oxide of the constituent element of the metal support 20 is excluded from the ceramic material constituting the coating layer 40.
  • the coating layer 40 according to this embodiment is joined to the outer edge of the electrolyte layer 7. This makes it possible to suppress heat dissipation from the metal support 20 through the gap between the coating layer 40 and the electrolyte layer 7, so that the heat retention of the electrolytic cell 1 can be further improved.
  • the covering layer 40 can be formed integrally with the electrolyte layer 7.
  • the coating layer 40 can be formed at the same time as the electrolyte layer 7, the manufacturing process of the electrolytic cell 1 can be simplified. Note that when the coating layer 40 is formed integrally with the electrolyte layer 7, there is no interface between the electrolyte layer 7 and the coating layer 40.
  • FIG. 2 is an enlarged view of a cross section perpendicular to the side surface 20R of the metal support 20 according to the embodiment.
  • the covering layer 40 has through holes 41.
  • the coating layer 40 is discontinuous in cross-sectional view. Therefore, even if the covering layer 40 is joined to the electrolyte layer 7, the expansion and contraction of the covering layer 40 can be suppressed from being transmitted to the electrolyte layer 7. Therefore, damage (for example, cracks, etc.) to the electrolyte layer 7 caused by being pulled or pushed by the coating layer 40 can be suppressed.
  • the covering layer 40 has two through holes 41 in FIG. 2, the number of through holes 41 is not particularly limited.
  • the shape of the through hole 41 in a plan view of the coating layer 40 is not particularly limited, but preferably extends in the shape of a slit along the extending direction of the side surface 20R (direction perpendicular to the paper surface of FIG. 2). As a result, expansion and contraction of the covering layer 40 can be efficiently absorbed, so that damage to the electrolyte layer 7 can be further suppressed.
  • the porosity of the coating layer 40 is not particularly limited, but can be, for example, 0.1% or more and 70% or less.
  • the thickness of the coating layer 40 is not particularly limited, but can be, for example, 0.1 ⁇ m or more and 100 ⁇ m or less.
  • the coverage rate of the coating layer 40 is not particularly limited, but may be, for example, 20% or more and 100% or less.
  • the method of forming the coating layer 40 is not particularly limited, but it can be easily formed by applying a slurry containing a ceramic material to the side surface 20R of the metal support 20.
  • the covering layer 40 is joined to the electrolyte layer 7, but as shown in FIG. 3, the covering layer 40 may be separated from the electrolyte layer 7. In this case, since it is possible to reliably suppress the expansion and contraction of the coating layer 40 from being transmitted to the electrolyte layer 7, it is possible to both improve the heat retention of the electrolytic cell 1 and suppress damage to the electrolyte layer 7.
  • the coating layer 40 covers the side surface 20R of the metal support 20, but as shown in FIG. . Thereby, heat radiation from the channel member 30 can also be suppressed, so that the heat retention of the electrolytic cell 1 can be further improved.
  • the hydrogen electrode layer 6 functions as a cathode and the oxygen electrode layer 9 functions as an anode, but even if the hydrogen electrode layer 6 functions as an anode and the oxygen electrode layer 9 functions as a cathode, good.
  • the constituent materials of the hydrogen electrode layer 6 and the oxygen electrode layer 9 are exchanged, and the raw material gas is caused to flow over the outer surface of the hydrogen electrode layer 6.
  • the electrolytic cell 1 has been described as an example of an electrochemical cell, but the electrochemical cell is not limited to an electrolytic cell.
  • An electrochemical cell consists of an element with a pair of electrodes arranged so that an electromotive force is generated from the overall redox reaction, and an element that converts chemical energy into electrical energy. It is a generic term. Therefore, electrochemical cells include, for example, fuel cells that use oxide ions or protons as carriers.

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  • Fuel Cell (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
PCT/JP2023/005285 2022-03-08 2023-02-15 電気化学セル Ceased WO2023171276A1 (ja)

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JP2022-035314 2022-03-08

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008251246A (ja) * 2007-03-29 2008-10-16 Dainippon Printing Co Ltd 固体酸化物形燃料電池用構造体及びこれを用いた固体酸化物形燃料電池
JP2020149970A (ja) * 2019-03-07 2020-09-17 日本碍子株式会社 電気化学セル
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