WO2025104826A1 - Electrochemical cell - Google Patents

Abstract

In the present invention, an electrolysis cell (10) is provided with: a support substrate (12) having a through-hole (40); a hydrogen-pole current collector layer (13) having an embedded section (70) which is embedded in the through-hole (40), and a first layer section (80) continuous with the embedded section (70) and disposed above the support substrate (12); and a hydrogen-pole active layer (14) disposed above the hydrogen-pole current-collector layer (13). The first layer section (80) includes a void (81) that adjoins a first surface (T1) on the hydrogen-pole active layer (14) side of the support substrate (12).

Description

Electrochemical Cell

The present invention relates to an electrochemical cell.

Patent Document 1 discloses an anode-supported fuel cell that includes a support substrate with a through-hole, an anode embedded in the through-hole, an electrolyte layer disposed on the support substrate, and a cathode disposed on the electrolyte layer.

JP 2013-201061 A

In the fuel cell described in Patent Document 1, the anode is embedded in a through-hole in the support substrate, which causes a problem that the supply of raw material gas to the anode is easily hindered by the support substrate. This problem is not limited to fuel cells, but occurs in all electrochemical cells, including electrolysis cells.

The objective of the present invention is to provide an electrochemical cell that can improve performance.

The electrochemical cell according to the first aspect of the present invention comprises a support substrate having a through hole, a current collecting layer having an embedded portion embedded in the through hole and a layer portion connected to the embedded portion and disposed on the support substrate, a first electrode layer disposed on the current collecting layer, a second electrode layer, and an electrolyte layer disposed between the first electrode layer and the second electrode layer. The layer portion includes a void in contact with the surface of the support substrate facing the first electrode layer.

The electrochemical cell according to the second aspect of the present invention relates to the first aspect, and the support substrate has a beam member having the surface. The beam member extends in a first direction perpendicular to the thickness direction of the support substrate. In a cross section perpendicular to the first direction, the void is in contact with a central region of the surface in a second direction perpendicular to the thickness direction.

The electrochemical cell according to the third aspect of the present invention is the same as the second aspect, and the thickness of the void becomes thinner the further away from the center of the surface in the second direction.

The present invention provides an electrochemical cell that can improve performance.

FIG. 1 is a cross-sectional view of an electrolysis cell device according to an embodiment. FIG. 2 is a partially enlarged view of FIG.

(Electrolytic cell device 1)
FIG. 1 is a cross-sectional view showing the configuration of an electrolysis cell device 1 according to an embodiment.

The electrolytic cell device 1 includes an electrolytic cell 10, a separator 20, a current collecting member 25, and a sealing portion 30. The electrolytic cell 10 is an example of an "electrochemical cell" according to the present invention. A cell stack (not shown) can be formed by stacking multiple electrolytic cell devices 1 in the Z-axis direction perpendicular to the X-axis direction and the Y-axis direction.

(Electrolytic cell 10)
1, the electrolysis cell 10 includes a support substrate 12, a hydrogen electrode current collecting layer 13, a hydrogen electrode active layer 14, an electrolyte layer 15, a reaction prevention layer 16, and an oxygen electrode layer 17. The hydrogen electrode current collecting layer 13, the hydrogen electrode active layer 14, the electrolyte layer 15, the reaction prevention layer 16, and the oxygen electrode layer 17 are stacked in this order in the Z-axis direction.

The hydrogen electrode current collecting layer 13 is an example of a "current collecting layer" according to the present invention. The hydrogen electrode active layer 14 is an example of a "first electrode layer" according to the present invention. The oxygen electrode layer 17 is an example of a "second electrode layer" according to the present invention.

The support substrate 12, hydrogen electrode current collecting layer 13, hydrogen electrode active layer 14, electrolyte layer 15, and oxygen electrode layer 17 are essential components, while the reaction prevention layer 16 is optional.

[Support substrate 12]
The support substrate 12 functions as a support for the electrolysis cell 10 together with the hydrogen electrode current collecting layer 13. The support substrate 12 has a plurality of through holes 40, beam portions 50, and a frame portion 60.

Each through hole 40 penetrates the support substrate 12. Each through hole 40 extends along the thickness direction (Z-axis direction) of the support substrate 12. Each through hole 40 is formed inside the beam portion 50 or between the beam portion 50 and the frame portion 60. At least a portion of the hydrogen electrode current collecting layer 13 is embedded in each through hole 40.

The beam portion 50 is disposed inside the frame portion 60. The beam portion 50 may be substantially integral with the frame portion 60.

The beam section 50 is composed of multiple beam members 51. Each beam member 51 is formed in a rod shape. The ends of each beam member 51 are connected to the inner peripheral surface of the frame section 60. In this embodiment, the multiple beam members 51 are connected to each other in a lattice pattern, but the number and positions of each beam member 51 can be changed as appropriate.

The beam portion 50 can be made of, for example, forsterite (Mg ₂ SiO ₄ ), magnesium silicate (MgSiO ₃ ), zirconia (including ZrO ₂ and partially stabilized zirconia), magnesia (MgO), spinel (MgAl ₂ O ₄ , NiAl ₂ O ₄ ), yttria stabilized zirconia (YSZ), calcia stabilized zirconia (CSZ), nickel (Ni), nickel oxide (NiO), alumina (Al ₂ O ₃ ), nickel oxide-magnesia solid solution (Mg _x Ni _(1-x) O[0<x<1]), and a mixed material of two or more of these.

The porosity of the beam portion 50 is not particularly limited, but can be, for example, 0.1% or more and 15% or less. The porosity of the beam portion 50 may be lower than the porosity of the hydrogen electrode current collecting layer 13. It is preferable that the porosity of the beam portion 50 is 5% or less. This can improve the rigidity of the beam portion 50.

The electronic conductivity of the beam portion 50 may be lower than that of the hydrogen electrode current collecting layer 13. The beam portion 50 may have electronic insulation. The electronic conductivity of the beam portion 50 is not particularly limited, but may be, for example, 10 ⁻¹ S/m or less at 800° C. or less.

The method for forming the beam portion 50 is not particularly limited, and methods such as extrusion molding, tape casting, printing lamination, casting, and dry pressing can be used.

The frame portion 60 is formed in an annular shape. The frame portion 60 surrounds the beam portion 50 and the hydrogen electrode current collecting layer 13. In this embodiment, the frame portion 60 is disposed on the separator 20. The frame portion 60 is positioned by the sealing portion 30.

The frame 60 can be made of, for example, forsterite (Mg ₂ SiO ₄ ), magnesium silicate (MgSiO ₃ ), zirconia (including ZrO ₂ and partially stabilized zirconia), magnesia (MgO), spinel (MgAl ₂ O ₄ , NiAl ₂ O ₄ ), yttria stabilized zirconia (YSZ), calcia stabilized zirconia (CSZ), nickel (Ni), nickel oxide (NiO), alumina (Al ₂ O ₃ ), nickel oxide-magnesia solid solution (Mg _x Ni _(1-x) O[0<x<1]), and a mixed material of two or more of these. The frame 60 may be made of the same material as the beam 50. In this case, the frame 60 may be substantially integral with the beam 50. The frame 60 may be made of a material different from that of the beam 50.

The porosity of the frame 60 can be, for example, 0.1% or more and 15% or less. The porosity of the frame 60 may be lower than the porosity of the hydrogen electrode current collecting layer 13. The porosity of the frame 60 is preferably 5% or less. This provides the frame 60 with gas sealing properties, thereby preventing the raw material gas supplied from the hydrogen electrode side space S1 to the hydrogen electrode current collecting layer 13 from returning to the hydrogen electrode side space S1 via the frame 60.

The electronic conductivity of the frame 60 may be lower than the electronic conductivity of the hydrogen electrode current collecting layer 13. The frame 60 may have electronic insulation properties. The electronic conductivity of the frame 60 is not particularly limited, but can be, for example, 10 ⁻¹ S/m or less at 800° C. or less.

The method for forming the frame portion 60 is not particularly limited, and methods such as extrusion molding, tape casting, printing lamination, casting, dry pressing, etc. can be used.

[Hydrogen electrode current collecting layer 13]
The hydrogen electrode current collecting layer 13, together with the support substrate 12, functions as a support for the electrolysis cell 10. The hydrogen electrode current collecting layer 13 has a plurality of embedded portions 70, first layer portions 80, and second layer portions 90. One of the embedded portions 70, the first layer portions 80, and the second layer portions 90 is a required component, and the other of the first layer portions 80 and the second layer portions 90 is an optional component.

Each embedded portion 70 is embedded in each through hole 40 of the support substrate 12. Each embedded portion 70 is connected to the first layer portion 80. Each embedded portion 70 is connected to the second layer portion 90. Each embedded portion 70 is disposed between the first layer portion 80 and the second layer portion 90 in the thickness direction (Z-axis direction) of the support substrate 12.

The first layer portion 80 is disposed between each embedded portion 70 and the hydrogen electrode active layer 14. The first layer portion 80 is formed integrally with each embedded portion 70. The first layer portion 80 is disposed on the beam portion 50. The first layer portion 80 covers the hydrogen electrode active layer 14 side of the beam portion 50 of the support substrate 12.

The second layer portion 90 is disposed on the opposite side of the first layer portion 80 with respect to each embedded portion 70. The second layer portion 90 is formed integrally with each embedded portion 70. The second layer portion 90 is disposed on the beam portion 50. The second layer portion 90 covers the side of the support substrate 12 opposite the hydrogen electrode active layer 14 of the beam portion 50.

The detailed structure of the hydrogen electrode current collecting layer 13 will be described later.

The hydrogen electrode current collecting layer 13 is a porous body having electronic conductivity. The hydrogen electrode current collecting layer 13 contains nickel (Ni). In the case of co-electrolysis, 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. During operation of the electrolysis cell 10, Ni is basically present in the form of metal Ni, but may also be partially present in the form of nickel oxide (NiO).

The hydrogen electrode current collecting layer 11 contains a ceramic in addition to nickel (Ni). The ceramic may have ion conductivity. Examples of the ceramic that can be used include yttria (Y ₂ O ₃ ), magnesia (MgO), iron oxide (Fe ₂ O ₃ ), zirconia (ZrO ₂ , including partially stabilized zirconia), yttria stabilized zirconia (YSZ), calcia stabilized zirconia (CSZ), scandia stabilized zirconia (ScSZ), gadolinium doped ceria (GDC), samarium doped ceria (SDC), and a mixed material of two or more of these.

The porosity of the hydrogen electrode current collecting layer 13 is not particularly limited, but can be, for example, 20% to 40%. The thickness of the hydrogen electrode current collecting layer 13 is not particularly limited, but can be, for example, 150 μm to 1000 μm. In the Z-axis direction, the thickness of the hydrogen electrode current collecting layer 13 may be greater than the thickness of each of the hydrogen electrode active layer 14, the electrolyte layer 15, the reaction prevention layer 16, and the oxygen electrode layer 17.

[Hydrogen electrode active layer 14]
The hydrogen electrode active layer 14 functions as a cathode. The hydrogen electrode active layer 14 is disposed on the hydrogen electrode current collecting layer 13. The hydrogen electrode active layer 14 is covered with an electrolyte layer 15.

A source gas is supplied to the hydrogen electrode active layer 14 through the hydrogen electrode current collecting layer 13. In this embodiment, the source gas contains at least _H2O .

When the source gas contains only H ₂ O, the hydrogen electrode active layer 14 produces H ₂ from the source gas in accordance with the electrochemical reaction of water electrolysis shown in the following formula (1).

Hydrogen electrode active layer 14: H2O+2e-→H2+O2-...(1)

When the source gas contains CO ₂ in addition to H ₂ O, the hydrogen electrode active layer 14 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 active layer 14: 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 active layer 14 is a porous body having electronic conductivity. The hydrogen electrode active layer 14 may have ion conductivity. The hydrogen electrode active layer 14 may be composed of, for example, 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 , a mixed material of two or more of these, or a composite of one or more of these and NiO.

The porosity of the hydrogen electrode active layer 14 is not particularly limited, but can be, for example, 20% to 40%. The thickness of the hydrogen electrode active layer 14 is not particularly limited, but can be, for example, 5 μm to 50 μm.

The method for forming the hydrogen electrode active layer 14 is not particularly limited, and tape casting, screen printing, casting, dry pressing, etc. can be used.

[Electrolyte layer 15]
The electrolyte layer 15 is disposed between the hydrogen electrode active layer 14 and the oxygen electrode layer 17. In this embodiment, the reaction prevention layer 16 is disposed between the electrolyte layer 15 and the oxygen electrode layer 17, so that the electrolyte layer 15 is sandwiched between the hydrogen electrode active layer 14 and the reaction prevention layer 16.

The electrolyte layer 15 covers the hydrogen electrode active layer 14. As shown in FIG. 1, it is preferable that the electrolyte layer 15 covers the entire surface of the hydrogen electrode active layer 14. The outer periphery of the electrolyte layer 15 is connected to the frame portion 60.

The electrolyte layer 15 has a function of transmitting O ^2- generated in the hydrogen electrode active layer 14 to the oxygen electrode layer 17. The electrolyte layer 15 is a dense body that has ionic conductivity but no electronic conductivity. The electrolyte layer 15 can be made of, for example, YSZ, GDC, ScSZ, SDC, lanthanum gallate (LSGM), or the like.

The porosity of the electrolyte layer 15 is not particularly limited, but can be, for example, 0.1% to 7%. The thickness of the electrolyte layer 15 is not particularly limited, but can be, for example, 1 μm to 100 μm.

The method for forming the electrolyte layer 15 is not particularly limited, and tape casting, screen printing, casting, dry pressing, etc. can be used.

[Reaction prevention layer 16]
The reaction prevention layer 16 is disposed between the electrolyte layer 15 and the oxygen electrode layer 17. The reaction prevention layer 16 is disposed on the opposite side of the electrolyte layer 15 to the hydrogen electrode active layer 14. The reaction prevention layer 16 prevents the constituent elements of the electrolyte layer 15 from reacting with the constituent elements of the oxygen electrode layer 17 to form a layer with high electrical resistance.

The reaction prevention layer 16 is made of an ion-conductive material. The reaction prevention layer 16 can be made of GDC, SDC, etc.

The porosity of the reaction prevention layer 16 is not particularly limited, but can be, for example, 0.1% to 50%. The thickness of the reaction prevention layer 16 is not particularly limited, but can be, for example, 1 μm to 50 μm.

The method for forming the reaction prevention layer 16 is not particularly limited, and tape casting, screen printing, casting, dry pressing, etc. can be used.

[Oxygen electrode layer 17]
The oxygen electrode layer 17 functions as an anode. The oxygen electrode layer 17 is disposed on the opposite side of the hydrogen electrode active layer 14 with respect to the electrolyte layer 15. In this embodiment, since the reaction prevention layer 16 is disposed between the electrolyte layer 15 and the oxygen electrode layer 17, the oxygen electrode layer 17 is connected to the reaction prevention layer 16. If the reaction prevention layer 16 is not disposed between the electrolyte layer 15 and the oxygen electrode layer 17, the oxygen electrode layer 17 is connected to the electrolyte layer 15.

The oxygen electrode layer 17 generates _O2 from ^O2- transferred from the hydrogen electrode active layer 14 through the electrolyte layer 15, according to the chemical reaction of the following formula (5). The _O2 generated in the oxygen electrode layer 17 is released into the oxygen electrode side space S2.

Oxygen electrode layer 17: 2O ²⁻ →O ₂ +4e ⁻ (5)

The oxygen electrode layer 17 is a porous body having ionic and electronic 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 ion conductive material (such as GDC).

The porosity of the oxygen electrode layer 17 is not particularly limited, but can be, for example, 20% or more and 60% or less. The thickness of the oxygen electrode layer 17 is not particularly limited, but can be, for example, 1 μm or more and 100 μm or less.

The method for forming the oxygen electrode layer 17 is not particularly limited, and tape casting, screen printing, casting, dry pressing, etc. can be used.

(Separator 20)
The separator 20 is electrically connected to the hydrogen electrode current collecting layer 13 via the current collecting member 25. The separator 20 has a connection portion 20a that contacts the current collecting member 25.

The separator 20 is made of a metal material that has electronic conductivity. The separator 20 can be made of an alloy material that contains Cr (chromium), for example. Examples of such alloy materials include Fe-Cr alloy steel (stainless steel, etc.) and Ni-Cr alloy steel. The Cr content in the separator 20 is not particularly limited, but can be 4% by mass or more and 30% by mass or less.

The separator 20 may contain Ti (titanium) or Zr (zirconium). The Ti content in the separator 20 is not particularly limited, but may be 0.01 mol% or more and 1.0 mol% or less. The Al content in the separator 20 is not particularly limited, but may be 0.01 mol% or more and 0.4 mol% or less. The separator 20 may contain Ti as _TiO2 (titania) and Zr as _ZrO2 (zirconia).

At least a portion of the surface of the separator 20 may be covered with an oxide film formed by oxidation of the constituent elements of the separator 20. A typical example of the oxide film is a chromium oxide film.

(Current collecting member 25)
The current collecting member 25 electrically connects the hydrogen electrode current collecting layer 13 and the connection portion 20a of the separator 20. As shown in FIG.

The current collecting member 25 has electronic conductivity and breathability. For example, a porous material such as nickel, a nickel alloy, or stainless steel can be used as the current collecting member 25. The size, shape, and position of the current collecting member 25 can be changed as appropriate. For example, in this embodiment, the current collecting member 25 is in contact with the hydrogen electrode current collecting layer 13 and the frame 60, but it does not have to be in contact with the frame 60.

(Sealing portion 30)
The sealing portion 30 positions the frame portion 60 relative to the separator 20. The sealing portion 30 is a dense body. The sealing portion 30 seals the gap between the electrolysis cell 10 and the separator 20. This prevents gas from mixing between the hydrogen electrode side space S1 and the oxygen electrode side space S2.

In this embodiment, the sealing portion 30 is connected to the electrolyte layer 15 and the frame portion 60 of the support substrate 12, but if the beam portion 50 does not have breathability, the sealing portion 30 does not need to be connected to the electrolyte layer 15.

The sealing portion 30 preferably has electronic insulation properties. This can prevent a short circuit from occurring between the hydrogen electrode current collecting layer 13 and the separator 20. The sealing portion 30 can be made of, for example, glass, glass ceramics (crystallized glass), a composite of glass and ceramics, etc.

(Detailed configuration of hydrogen electrode current collecting layer 13)
The detailed configuration of the hydrogen electrode current collecting layer 13 will be described with reference to Fig. 2. Fig. 2 is a partially enlarged view of Fig. 1. Fig. 2 shows a cross section perpendicular to the Y-axis direction.

Each beam member 51 extends in a rod-like shape along the Y-axis direction (i.e., the direction perpendicular to the paper surface of FIG. 2). The Y-axis direction is perpendicular to the thickness direction (Z-axis direction). The Y-axis direction is an example of the "first direction" according to the present invention.

The cross section of each beam member 51 is rectangular. Each beam member 51 has a first surface T1, a second surface T2, and a third surface T3.

The first surface T1 is the surface of the beam member 51 on the hydrogen electrode active layer 14 side. The first surface T1 faces the hydrogen electrode active layer 14. The first surface T1 includes a central region a1, a first end region a2, and a second end region a3. The central region a1, the first end region a2, and the second end region a3 are defined by dividing the first surface T1 into three equal parts in the X-axis direction. The first end region a2 and the second end region a3 are each an example of an "end region" according to the present invention. The X-axis direction is a direction perpendicular to the thickness direction (Z-axis direction) and the Y-axis direction. The X-axis direction is an example of a "second direction" according to the present invention.

The second surface T2 is the surface of the beam member 51 on the hydrogen electrode side space S1 side. The second surface T2 is the surface of the beam member 51 opposite the hydrogen electrode active layer 14. The second surface T2 is provided on the opposite side of the first surface T1.

The third surface T3 is the inner circumferential surface of the through hole 40. The third surface T3 is connected to the first surface T1 and the second surface T2.

As described above, the hydrogen electrode current collecting layer 13 has a plurality of embedded portions 70, a first layer portion 80, and a second layer portion 90.

2, the first layer portion 80 has a void 81. The void 81 is in contact with the first surface T1 of the beam member 51 on the hydrogen electrode active layer 14 side. In this way, the first layer portion 80 has a void 81 in contact with the first surface T1 of the beam member 51, which makes it easier for the raw material gas that has passed through the through hole 40 to diffuse throughout the first layer portion 80. This makes it possible to prevent the supply of raw material gas from being hindered by the support substrate 12, thereby improving the performance of the electrolysis cell device 1. Note that, although the first layer portion 80 has only one void 81 in FIG. 2, the number and position of the voids 81 can be changed as appropriate.

As shown in FIG. 2, the void 81 is in contact with the central region a1 of the first surface T1. Therefore, the raw material gas can be smoothly supplied to the region of the hydrogen electrode active layer 14 located directly above the central region a1, which is the farthest from the through hole 40 and to which the raw material gas is least likely to be supplied. In this embodiment, the void 81 is also in contact with the first end region a2 and the second end region a3 of the first surface T1. However, the void 81 does not have to be in contact with both or either of the first end region a2 and the second end region a3.

The thickness of the gap 81 becomes thinner the further away from the center C1 of the first surface T1 in the X-axis direction. In other words, both ends of the gap 81 are tapered in the direction away from the center C1 of the first surface T1. Therefore, the raw material gas can be preferentially supplied to the region of the hydrogen electrode active layer 14 located directly above the central region a1, which is the furthest from the through-hole 40 and where a shortage of raw material gas is likely to occur.

The hydrogen electrode current collecting layer 13 having the above configuration can be fabricated as follows. First, each through hole 40 of the support substrate 12 is filled with a paste containing the constituent material of the hydrogen electrode current collecting layer 13. Next, a pore-forming material is placed at a desired position on one surface of each beam member 51 of the support substrate 12. Next, the paste containing the constituent material of the hydrogen electrode current collecting layer 13 is applied so as to cover one surface of each beam member 51. Next, a pore-forming material is placed at a desired position on the other surface of each beam member 51 of the support substrate 12. Next, the paste containing the constituent material of the hydrogen electrode current collecting layer 13 is applied so as to cover the other surface of each beam member 51. Next, the paste is subjected to a heat treatment (350°C or higher, 1 hour or longer) to form the hydrogen electrode current collecting layer 13. At this time, the pore-forming material disappears due to the heat treatment, and the voids 81 and the second voids 91 are formed.

(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.

[Modification 1]
In the above embodiment, the hydrogen electrode current collecting layer 13 has the first layer portion 80 and the second layer portion 90 , but it is not necessary for the hydrogen electrode current collecting layer 13 to have one of the first layer portion 80 and the second layer portion 90 .

[Modification 2]
In the above embodiment, the gap 81 of the first layer portion 80 is in contact with the central region a1 of the first surface T1, but it may be in contact with only one of the first end region a2 and the second end region a3.

[Modification 3]
In the above embodiment, the gap 81 in the first layer-shaped portion 80 has both ends tapered in the X-axis direction, but the shape of the gap 81 can be appropriately changed. For example, the gap 81 may have a shape similar to that of the second gap 91.

[Modification 4]
In the above embodiment, the second gap 91 of the second layer portion 90 is in contact with the first end region b2 of the second surface T2, but it does not have to be in contact with the first end region b2.

[Modification 5]
In the above embodiment, the second gap 91 of the second layer portion 90 has one end portion in the X-axis direction that is tapered, but the shape of the second gap 91 can be appropriately changed. For example, the second gap 91 may have a shape similar to that of the gap 81.

[Modification 6]
In the above embodiment, the hydrogen electrode current collecting layer 13 has a plurality of embedded portions 70, but the number of embedded portions 70 may be one or more.

[Modification 7]
In the above embodiment, the support substrate 12 has the frame portion 60 , but it does not have to have the frame portion 60 .

[Modification 8]
In the above embodiment, the hydrogen electrode active layer 14 functions as a cathode and the oxygen electrode layer 17 functions as an anode, but the hydrogen electrode active layer 14 may function as an anode and the oxygen electrode layer 17 may function as a cathode. In this case, the constituent materials of the hydrogen electrode active layer 14 and the oxygen electrode layer 17 are switched, and a source gas is caused to flow on the outer surface of the hydrogen electrode active layer 14. The hydrogen electrode current collecting layer 13 functions as an oxygen electrode current collecting layer, but the configuration and function of the oxygen electrode current collecting layer are the same as those of the hydrogen electrode current collecting layer 13 described in the above embodiment.

[Modification 9]
In the above embodiment, the electrolysis cell 10 has been described as an example of an electrochemical cell, but the electrochemical cell is not limited to an 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.

1...electrolysis cell device, 10...electrolysis cell, 12...support substrate, 13...hydrogen electrode current collecting layer, 14...hydrogen electrode active layer, 15...electrolyte layer, 16...reaction prevention layer, 17...oxygen electrode layer, 20...separator, 25...current collecting member, 30...sealing portion, 40...through hole, 50...beam portion, 51...beam member, T1...first surface, T2...second surface, T3...third surface, a1...central region, a2...first end region, a3...second end region, 60...frame portion, 70...embedded portion, 80...first layer portion, 81...void, 90...second layer portion

Claims (3)

A support substrate having a through hole;
a current collecting layer including a buried portion buried in the through hole and a layer portion connected to the buried portion and disposed on the support substrate;
a first electrode layer disposed on the current collecting layer;
A second electrode layer;
an electrolyte layer disposed between the first electrode layer and the second electrode layer;
Equipped with
the layer portion includes a gap in contact with a surface of the support substrate on the side of the first electrode layer,
Electrochemical cell. the supporting substrate has a beam member having the surface,
The beam member extends in a first direction perpendicular to a thickness direction of the support substrate,
In a cross section perpendicular to the first direction, the void is in contact with a central region of the surface in a second direction perpendicular to the thickness direction.
10. The electrochemical cell of claim 1. The thickness of the gap becomes thinner as it moves away from the center of the surface in the second direction.
3. The electrochemical cell of claim 2.

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