Electrochemical Equipment

Abstract

To provide an electrochemical device capable of effectively achieving the improvement of power generation performance and electrolytic performance.SOLUTION: In an embodiment, a solid oxide type cell is configured to make an electrolyte membrane of a solid oxide sandwiched by a first electrode and a second electrode. A first separator part is installed on the side of the first electrode in the solid oxide type cell. A second separator part is installed on the side of the second electrode in the sold oxide type cell. First electrode gas is made to flow between the first separator part and the first electrode, and second electrode gas is made to flow between the second separator part and the second electrode. Here, the first separator part has a housing space for housing at least the first electrode in the solid oxide type cell; a gap is interposed between a side face of the first electrode and a side face of the housing space; and the gap is provided with a gas barrier part for preventing the first electrode gas from flowing.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Embodiments of the present invention relate to electrochemical devices. [Background technology]

[0002] The electrochemical device has, for example, a solid oxide cell configured such that a solid oxide electrolyte membrane is sandwiched between a hydrogen electrode and an oxygen electrode. In the electrochemical device, the solid oxide cell functions as at least one of a solid oxide fuel cell (SOFC) and a solid oxide electrolysis cell (SOEC).

[0003] When a solid oxide cell functions as an SOFC, a reducing fuel gas (hydrogen, hydrocarbon, ammonia, etc.) supplied to the hydrogen electrode reacts with an oxidizing gas (oxygen, air, etc.) supplied to the oxygen electrode through the electrolyte membrane under high-temperature (e.g., 600 to 900°C) operating conditions. Here, a fuel cell reaction occurs at each of the hydrogen electrode and the oxygen electrode, as shown in the following reaction formula:

[0004] Hydrogen electrode: H2+O 2- →H2O+2e - Oxygen electrode: (1 / 2)O2+2e - →O 2-

[0005] In contrast, when functioning as an SOEC, a solid oxide cell undergoes a reaction opposite to that which occurs when functioning as an SOFC, in which high-temperature (e.g., 700°C or higher) water vapor decomposes into hydrogen and oxygen. In other words, an electrolysis reaction occurs at each of the hydrogen and oxygen electrodes, as shown in the following reaction formula:

[0006] Hydrogen electrode: H2O+2e - →H2+O 2- Oxygen electrode: O 2- →(1 / 2)O2+2e - [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 5904701 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-55951 [Patent Document 3] Japanese Patent Application Laid-Open No. 2008-66296 [Patent Document 4] Japanese Patent Application Laid-Open No. 2007-287585 [Patent Document 5] Japanese Patent Application Laid-Open No. 2007-323955 Summary of the Invention [Problem to be solved by the invention]

[0008] In the electrochemical device, the solid oxide cell is housed in a housing space of a separator, and the separator may have gas flow channels formed therein to supply feed gas as a raw material to each of the hydrogen electrode and the oxygen electrode, and to discharge product gases generated at each of the hydrogen electrode and the oxygen electrode.

[0009] In electrochemical devices, the solid oxide cells and separators may interfere with each other, causing distortion or damage. For example, distortion or damage occurs when the solid oxide cells and separators come into contact with each other due to dimensional variations or thermal expansion during operation, resulting in significant stress being applied to both. As a result, the power generation performance and electrolysis performance of the electrochemical device may be reduced.

[0010] For this reason, the separator is configured so that, when the solid oxide cells are housed in the housing space, a gap is formed between the side surface of the solid oxide cell and the side surface of the separator housing space. However, gases such as feed gas supplied to the solid oxide cell and product gas generated in the solid oxide cell may leak into the gap between the side surface of the solid oxide cell and the side surface of the separator housing space. As a result, the power generation performance and electrolysis performance of the electrochemical device may be reduced.

[0011] Therefore, an object of the present invention is to provide an electrochemical device that can effectively improve power generation performance and electrolysis performance. [Means for solving the problem]

[0012] The electrochemical device of the embodiment includes a solid oxide cell, a first separator member, and a second separator member. The solid oxide cell is configured such that a solid oxide electrolyte membrane is sandwiched between a first electrode and a second electrode. The first separator member is disposed on the first electrode side of the solid oxide cell. The second separator member is disposed on the second electrode side of the solid oxide cell. A first electrode gas flows between the first separator member and the first electrode, and a second electrode gas flows between the second separator member and the second electrode. Here, the first separator member has a storage space that stores at least the first electrode of the solid oxide cell, and a gap is interposed between the side of the first electrode and the side of the storage space, and a gas barrier member is disposed in the gap to prevent the first electrode gas from flowing. The gas barrier portion is a biasing member that biases the space between the side surface of the solid oxide cell and the side surface of the storage space. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram schematically illustrating an electrochemical device 1 according to a first embodiment. [Figure 2] FIG. 2 is a diagram schematically illustrating the electrochemical device 1 according to the first embodiment. [Figure 3] FIG. 3 is a diagram schematically illustrating an electrochemical device 1b according to a second embodiment. [Figure 4] FIG. 4 is a diagram schematically illustrating an electrochemical device 1c according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] First Embodiment [A] Configuration 1 and 2 are diagrams schematically illustrating an electrochemical device 1 according to a first embodiment. Fig. 1 is a top view of the electrochemical device 1, showing a portion corresponding to the plane (xy plane) of the Z1-Z1 portion in Fig. 2. Fig. 2 is a side cross-sectional view of the electrochemical device 1, showing a portion corresponding to the plane (xz plane) of the Y1-Y1 portion in Fig. 1.

[0015] As shown in Figures 1 and 2, the electrochemical device 1 has a single cell 2 including a solid oxide cell 10, a first current collector 21, a second current collector 22, a first separator section 31, a second separator section 32, an insulating material 40, and a gas barrier section 50, and is configured to perform power generation and electrolysis.

[0016] Although not shown in the figure, the electrochemical device 1 has a plurality of unit cells 2, and a cell stack is formed by stacking the unit cells 2. In the cell stack, the solid oxide cells 10 that make up the unit cells 2 are electrically connected in series to increase the power generation output, etc. The cell stack is sandwiched between a pair of end plates (not shown), and the pair of end plates are fastened together using fastening members such as bolts.

[0017] Although Figure 2 shows a case where the first separator part 31 and the second separator part 32 are separate bodies, when configuring a cell stack, they may be configured to include a portion where they are integrated together.

[0018] Each part of the unit cell 2 that constitutes the electrochemical device 1 will be described below in order.

[0019] [A-1] Solid oxide cell 10 The solid oxide cell 10 is a rectangular flat plate and includes an electrolyte membrane 110, a hydrogen electrode 111 (first electrode), and an oxygen electrode 112 (second electrode), with the electrolyte membrane 110 interposed between the hydrogen electrode 111 and the oxygen electrode 112. Here, the solid oxide cell 10 is, for example, a hydrogen electrode-supported type (fuel electrode-supported type), with the electrolyte membrane 110 and the oxygen electrode 112 sequentially stacked on top of the hydrogen electrode 111, which functions as a support. The solid oxide cell 10 is not limited to a hydrogen electrode-supported type (for example, an electrolyte-supported type), and may be of a shape other than a rectangular shape (such as a circle).

[0020] In the solid oxide cell 10, the electrolyte membrane 110 is a membrane made of oxide ions (O 2- The electrolyte membrane 110 is made of an ion-conductive solid oxide (for example, yttria-stabilized zirconia (YSZ)) that is permeable to oxygen. The electrolyte membrane 110 is configured to be denser than the hydrogen electrode 111 and the oxygen electrode 112.

[0021] In the solid oxide cell 10, the hydrogen electrode 111 is made of a porous electrical conductor (for example, a cermet made of nickel particles and ceramic particles such as YSZ).

[0022] In the solid oxide cell 10, the oxygen electrode 112 is made of a porous electrical conductor (such as a perovskite oxide such as LaSrMnO3).

[0023] In the electrolyte membrane 110, a region R10 sandwiched between the hydrogen electrode 111 and the oxygen electrode 112 has, for example, a rectangular planar shape. When the solid oxide cell 10 functions as an SOFC or an SOEC, oxide ions (O 2- ) moves.

[0024] [A-2] First current collecting material 21 and second current collecting material 22 The first current collector 21 is provided on the underside of the hydrogen electrode 111 that constitutes the solid oxide cell 10. The first current collector 21 has a network structure or a porous structure, and is configured to allow permeation of hydrogen electrode gas (first electrode gas) consumed or generated in the hydrogen electrode 111. The first current collector 21 is formed of a metal material such as nickel, and electrically connects the hydrogen electrode 111 and the first separator element 31 located below the hydrogen electrode 111. The first current collector 21 may be a biasing member that biases the hydrogen electrode 111 and the first separator element 31 to ensure electrical connection between them.

[0025] The second current collector 22 is provided on the lower surface of the oxygen electrode 112 that constitutes the solid oxide cell 10. Like the first current collector 21, the second current collector 22 has a mesh structure or a porous structure and is configured to allow oxygen electrode gas (second electrode gas) consumed or generated in the oxygen electrode 112 to pass through. The second current collector 22 is formed of a metal material such as silver, and electrically connects the oxygen electrode 112 and the second separator part 32 located above the oxygen electrode 112. Like the first current collector 21, the second current collector 22 may be a biasing member that biases the oxygen electrode 112 and the second separator part 32 to ensure electrical connection between them.

[0026] [A-3] First separator part 31 The first separator portion 31 is formed of a conductive material such as a metal, and is disposed on the hydrogen electrode 111 side of the solid oxide cell 10.

[0027] In this embodiment, the first separator portion 31 has an accommodating space K31. The accommodating space K31 is formed in the center of the upper surface of the first separator portion 31. The accommodating space K31 is a recess having a rectangular planar shape, and is configured to accommodate the first current collector 21 and the solid oxide cell 10. Here, the accommodating space K31 accommodates the electrolyte membrane 110 and the hydrogen electrode 111 of the solid oxide cell 10.

[0028] In the first separator portion 31, the storage space K31 is configured so that, when the first current collector 21 and the solid oxide cell 10 are accommodated, a gap G is interposed between each side of the first current collector 21 and the solid oxide cell 10 and the side of the storage space K31.

[0029] The first separator part 31 is provided with a hydrogen electrode gas supply port F311, a hydrogen electrode gas flow path F31, and a hydrogen electrode gas discharge port F312, and is configured so that the hydrogen electrode gas supplied from the hydrogen electrode gas supply port F311 passes through the hydrogen electrode gas flow path F31 and is then discharged from the hydrogen electrode gas discharge port F312. Here, the hydrogen electrode gas flow path F31 is, for example, a linear groove, and is formed on the support surface (bottom surface) that supports the hydrogen electrode 111 in the accommodation space K31.

[0030] The hydrogen electrode gas flow path F31 may be formed in the first current collector 21. Alternatively, the hydrogen electrode gas flow path F31 may not be formed, and the first current collector 21 may be configured to perform the function of the hydrogen electrode gas flow path F31. In other words, it is only necessary that the hydrogen electrode gas is configured to flow between the first separator part 31 and the hydrogen electrode 111.

[0031] [A-4] Second separator part 32 The second separator part 32, like the first separator part 31, is made of a conductive material such as a metal, and is placed on the oxygen electrode 112 side of the solid oxide cell .

[0032] The second separator section 32 is provided with an oxygen electrode gas supply port F321, an oxygen electrode gas flow path F32, and an oxygen electrode gas outlet F322, and is configured so that oxygen electrode gas supplied from the oxygen electrode gas supply port F321 passes through the oxygen electrode gas flow path F32 and is then discharged from the oxygen electrode gas outlet F322. The oxygen electrode gas flow path F32 is provided on the lower surface of the second separator section 32 facing the upper surface of the oxygen electrode 112. The oxygen electrode gas flow path F32 is, for example, a linear groove that is formed so as to be perpendicular to the linear groove that constitutes the hydrogen electrode gas flow path F31.

[0033] The oxygen electrode gas flow path F32 may be formed in the second current collector 22. Alternatively, the oxygen electrode gas flow path F32 may not be formed, and the second current collector 22 may be configured to perform the function of the oxygen electrode gas flow path F32. In other words, it is only necessary that the oxygen electrode gas flows between the second separator part 32 and the oxygen electrode 112.

[0034] [A-5] Insulation material 40 The insulating material 40 is interposed between the first separator portion 31 and the second separator portion 32. The insulating material 40 is made of an insulating material such as a glass material, and electrically insulates the first separator portion 31 from the second separator portion 32. The insulating material 40 also seals the space between the first separator portion 31 and the second separator portion 32.

[0035] The insulating material 40 has an opening K40 formed in the center, and the oxygen electrode 112 and the second current collector 22 are housed inside the opening K40.

[0036] The insulating material 40 includes a portion that protrudes inward above the accommodation space K31, and this protruding portion covers the gap G and is in contact with the upper surface of the electrolyte membrane 110.

[0037] [A-6] Gas barrier part 50 The gas barrier section 50 is installed in the gap G between the side surface of the hydrogen electrode 111 and the like and the side surface of the storage space K31 in the storage space K31. The gas barrier section 50 is provided to prevent the hydrogen electrode gas from flowing through the gap G.

[0038] In this embodiment, the gas barrier section 50 is provided in a portion of the gap G that is aligned with the direction of extension of the hydrogen electrode gas flow channel F31. Here, the gas barrier section 50 is a block formed along the direction of extension of the hydrogen electrode gas flow channel F31, and is installed so as not to come into contact with the side surfaces of the hydrogen electrode 111 and the like and the side surfaces of the accommodation space K31. The gas barrier section 50 is formed, for example, from an insulating material.

[0039] [B] Summary As described above, in the electrochemical device 1 of this embodiment, the first separator member 31 has an accommodation space K31 that accommodates the hydrogen electrode 111 and the like of the solid oxide cell 10, and a gap G is interposed between the side surface of the hydrogen electrode 111 and the like and the side surface of the accommodation space K31. A gas barrier member 50 is provided in the gap G, and the gas barrier member 50 prevents hydrogen electrode gas from flowing through the gap G. Therefore, in this embodiment, hydrogen electrode gas passing through the hydrogen electrode 111 is prevented from mixing into the gap G. As a result, in the electrochemical device of this embodiment, the power generation reaction proceeds efficiently, making it possible to improve power generation performance, and the power generation reaction proceeds efficiently, making it possible to improve electrolysis performance.

[0040] [C] Variation In the above embodiment, the case where the gas barrier section 50 does not come into contact with the side surfaces of the hydrogen electrode 111 and the like and the side surfaces of the accommodation space K31 in the gap G has been described, but this is not limited to this. The gas barrier section 50 may come into contact with the side surfaces of the hydrogen electrode 111 and the like and the side surfaces of the accommodation space K31 in the gap G.

[0041] In the above embodiment, the gas barrier section 50 is formed from an insulating material, but this is not limiting. The gas barrier section 50 can be formed from various materials as long as the material does not impede the operation of the electrochemical device 1 (e.g., a material that does not melt) when the temperature in the electrochemical device 1 becomes high enough to perform power generation or electrolysis. For example, the gas barrier section 50 may be formed from a conductive material. An example of the conductive material is a silver-based foam metal. Alternatively, the conductive material may be a mixture of a metal powder such as nickel and a binder such as glass or a filler. When the gas barrier section 50 is conductive and electrically connects the hydrogen electrode 111 and the first separator section 31, the resistance between the hydrogen electrode 111 and the first separator section 31 is reduced, thereby improving power generation performance and electrolysis performance.

[0042] Furthermore, the thermal expansion coefficient of the gas barrier section 50 is preferably equal to or lower than the thermal expansion coefficient of the solid oxide cell 10 (e.g., the hydrogen electrode 111, etc.) and the first separator section 31. This reduces the stress applied to each section due to contact between them when the solid oxide cell 10 (e.g., the hydrogen electrode 111, etc.), the gas barrier section 50, and the first separator section 31 expand due to high temperatures during power generation or electrolysis in the electrochemical device 1. As a result, breakage and distortion of the electrochemical device 1 can be prevented.

[0043] Second Embodiment [A] Configuration Fig. 3 is a diagram schematically showing an electrochemical device 1b according to a second embodiment. Like Fig. 1, Fig. 3 shows a top view (xy plane) of the electrochemical device 1b.

[0044] As shown in Fig. 3, the electrochemical device 1b of this embodiment differs from the first embodiment (see Fig. 1) in that the gas barrier section 50b is different. Other than this point and related points, the electrochemical device 1b is similar to the first embodiment. Therefore, in this embodiment, explanations of overlapping points will be omitted as appropriate.

[0045] In the electrochemical device 1b of this embodiment, the gas barrier portion 50b is provided in the gap G to prevent the hydrogen electrode gas from flowing through the gap G, as in the first embodiment.

[0046] However, in this embodiment, unlike the first embodiment, the gas barrier portion 50b is a leaf spring that is a biasing member, and is installed to bias the space between the side surface of the solid oxide cell 10 and the side surface of the storage space K31. Here, the gas barrier portion 50b is illustrated as a leaf spring including an arc-shaped portion, but is not limited to this shape and various shapes (such as a wave shape) can be adopted.

[0047] In addition, in this embodiment, the gas barrier portion 50b is formed of a conductive material having electrical conductivity, and contacts the side surface of the solid oxide cell 10 and the side surface of the storage space K31 in the gap G, thereby electrically connecting the hydrogen electrode 111 and the first separator portion 31.

[0048] [B] Summary As described above, in the electrochemical device 1b of this embodiment, the gas barrier section 50b is a biasing member that biases the side surface of the solid oxide cell 10 against the side surface of the storage space K31. Therefore, in this embodiment, the gas barrier section 50b, which is a biasing member, biases the side surface of the solid oxide cell 10 against the side surface of the storage space K31, and the solid oxide cell 10 is fixed to the storage space K31. As a result, in this embodiment, the gas barrier section 50b not only prevents the hydrogen electrode gas passing through the hydrogen electrode 111 from mixing into the gap G, but also reduces the stress applied to the solid oxide cell 10 (e.g., the hydrogen electrode 111) and the first separator section 31. Therefore, in the electrochemical device of this embodiment, it is possible to effectively prevent distortion and breakage.

[0049] Furthermore, in the electrochemical device 1b of this embodiment, the gas barrier section 50b is conductive and electrically connects the hydrogen electrode 111 and the first separator section 31. Therefore, in this embodiment, the resistance between the hydrogen electrode 111 and the first separator section 31 is reduced, making it possible to improve power generation performance and electrolysis performance.

[0050] <Third embodiment> [A] Configuration Fig. 4 is a diagram schematically illustrating an electrochemical device 1c according to a third embodiment. Like Fig. 1, Fig. 4 shows a top view (xy plane) of the electrochemical device 1c.

[0051] As shown in Fig. 4, the electrochemical device 1c of this embodiment differs from the first embodiment (see Fig. 1) in that the gas barrier section 50c is different. Other than this point and related points, the electrochemical device 1c is similar to the first embodiment. Therefore, in this embodiment, explanations of overlapping points will be omitted as appropriate.

[0052] In the electrochemical device 1c of this embodiment, the gas barrier portion 50c is provided in the gap G to prevent the hydrogen electrode gas from flowing through the gap G, as in the first embodiment.

[0053] However, in this embodiment, unlike the first embodiment, an upstream gas barrier section 51 and a downstream gas barrier section 52 are provided as the gas barrier section 50c.

[0054] The upstream gas barrier section 51 is installed in a portion of the gap G that is located on the upstream side (lower side in FIG. 4) in the flow direction of the hydrogen electrode gas. Here, the upstream gas barrier section 51 contacts the side surfaces of the hydrogen electrode 111 and the like in the gap G and the side surfaces of the accommodation space K31.

[0055] The downstream gas barrier section 52 is installed in a portion of the gap G that is located downstream (upper side in FIG. 4) in the flow direction of the hydrogen electrode gas. Here, the downstream gas barrier section 52 contacts the side surfaces of the hydrogen electrode 111 and the like and the side surfaces of the accommodation space K31 in the gap G.

[0056] [B] Summary As described above, in the electrochemical device 1c of this embodiment, the upstream gas barrier section 51 and the downstream gas barrier section 52 are provided as the gas barrier section 50c, so that the upstream gas barrier section 51 prevents the flow of hydrogen electrode gas that has leaked from the hydrogen electrode gas supply port F311 into the gap G, and the downstream gas barrier section 52 prevents the flow of hydrogen electrode gas that has leaked from the hydrogen electrode gas discharge port F312 into the gap G. As a result, in the electrochemical device 1c of this embodiment, the power generation reaction proceeds efficiently, making it possible to improve power generation performance, and the power generation reaction proceeds efficiently, making it possible to improve electrolysis performance.

[0057] Furthermore, before accommodating the solid oxide cell 10 or the like in the accommodating space K31 of the first separator section 31, the upstream gas barrier section 51 and the downstream gas barrier section 52 are installed in the portion of the accommodating space K31 where the gap G is provided, thereby facilitating the alignment of the solid oxide cell 10 or the like.

[0058] [C] Variation In the above embodiment, the case where the upstream gas barrier section 51 and the downstream gas barrier section 52 are provided as the gas barrier section 50c has been described, but this is not limiting. It is also possible to provide either the upstream gas barrier section 51 or the downstream gas barrier section 52. Even in this case, the gas barrier section 50c can obstruct the flow of the hydrogen electrode gas in the gap G, thereby improving the power generation performance and electrolysis performance of the electrochemical device 1c of this embodiment. In other words, the gas barrier section 50c may be provided on at least one of the upstream and downstream sides.

[0059] <Other> Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0060] 1: electrochemical device, 1b: electrochemical device, 1c: electrochemical device, 2: single cell, 10: solid oxide cell, 21: first current collector, 22: second current collector, 31: first separator portion, 32: second separator portion, 40: insulating material, 50: gas barrier portion, 50b: gas barrier portion, 50c: gas barrier portion, 51: upstream gas barrier portion, 52: downstream gas barrier portion, 110: electrolyte membrane, 111: hydrogen electrode (first electrode), 112: oxygen electrode (second electrode), F31: hydrogen electrode gas flow path, F311: hydrogen electrode gas supply port, F312: hydrogen electrode gas outlet port, F32: oxygen electrode gas flow path, F321: oxygen electrode gas supply port, F322: oxygen electrode gas outlet port, G: gap, K31: storage space, K40: opening, R10: region

Claims

1. a solid oxide cell configured such that a solid oxide electrolyte membrane is sandwiched between a first electrode and a second electrode; a first separator portion disposed on the first electrode side of the solid oxide cell; a second separator portion disposed on the second electrode side of the solid oxide cell; an electrochemical device configured so that a first electrode gas flows between the first separator member and the first electrode, and a second electrode gas flows between the second separator member and the second electrode, The first separator portion comprises: a storage space for storing at least the first electrode of the solid oxide cell; a gap is interposed between a side surface of the first electrode and a side surface of the accommodation space, and a gas barrier portion is provided in the gap to prevent the first electrode gas from flowing; the gas barrier portion is a biasing member that biases the space between a side surface of the solid oxide cell and a side surface of the storage space. Electrochemical equipment.

2. A solid oxide cell configured such that a solid oxide electrolyte membrane is sandwiched between a first electrode and a second electrode; a first separator portion disposed on the first electrode side of the solid oxide cell; a second separator portion disposed on the second electrode side of the solid oxide cell; an electrochemical device configured so that a first electrode gas flows between the first separator member and the first electrode, and a second electrode gas flows between the second separator member and the second electrode, The first separator portion comprises: a storage space for storing at least the first electrode of the solid oxide cell; a gap is interposed between a side surface of the first electrode and a side surface of the accommodation space, and a gas barrier portion is provided in the gap to prevent the first electrode gas from flowing; the gas barrier portion is electrically conductive and electrically connects the first electrode and the first separator portion; Electrochemical equipment.

3. A solid oxide cell configured such that a solid oxide electrolyte membrane is sandwiched between a first electrode and a second electrode; a first separator portion disposed on the first electrode side of the solid oxide cell; a second separator portion disposed on the second electrode side of the solid oxide cell; an electrochemical device configured so that a first electrode gas flows between the first separator member and the first electrode, and a second electrode gas flows between the second separator member and the second electrode, The first separator portion comprises: a storage space for storing at least the first electrode of the solid oxide cell; a gap is interposed between a side surface of the first electrode and a side surface of the accommodation space, and a gas barrier portion is provided in the gap to prevent the first electrode gas from flowing; a thermal expansion coefficient of the gas barrier portion is equal to or less than a thermal expansion coefficient of the solid oxide cell and equal to or less than a thermal expansion coefficient of the first separator portion; Electrochemical equipment.

4. The gas barrier portion is installed on at least one of the upstream side and the downstream side.

4. The electrochemical device according to claim 1.

5. The first electrode is a hydrogen electrode, The second electrode is an oxygen electrode.

5. The electrochemical device according to claim 1.

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