JP6283233B2 - Fuel cell - Google Patents

Description

  The present invention relates to a fuel cell.

  A solid oxide fuel cell using a solid oxide as an electrolyte (hereinafter sometimes referred to as “SOFC” or simply “fuel cell”) is known. The SOFC has, for example, a stack (fuel cell stack) in which a large number of fuel cells each including a fuel electrode and an air electrode are stacked on each main surface of a plate-like solid electrolyte layer. A fuel gas (for example, hydrogen) and an oxidant gas (for example, oxygen in the air) are supplied to the fuel electrode and the air electrode, respectively, and electric power is generated by causing a chemical reaction through the solid electrolyte layer.

  The fuel cell is joined to a separator that divides a section where the fuel gas and the oxidant gas are present. For this joining, a joining portion made of a brazing material such as Ag brazing is usually used. Glass may be used for this joining (see Patent Document 1). In addition, a technique using a plurality of glass ceramics for sealing metal members has been disclosed (see Patent Document 2).

JP 2000-331692 A JP 2013-182679 A

Here, when glass is used for sealing (sealing) or the like, the activity of the air electrode may be reduced. That is, there is a possibility that contaminants (for example, B) in the air electrode contained in the glass scatter and reach the air electrode, thereby hindering the reaction at the air electrode.
An object of the present invention is to provide a fuel cell in which poisoning of an air electrode caused by a sealing material is prevented.

(1) A fuel cell according to an embodiment of the present invention includes:
A separator that separates a first compartment supplied with fuel gas and a second compartment supplied with oxidant gas;
The fuel electrode disposed in the first section, the air electrode disposed in the second section, and the solid disposed between the fuel electrode and the air electrode, with the fuel electrode and the air electrode being separated. A single cell having an electrolyte layer;
A sealing portion for joining and sealing the single cell and the separator;
A fuel cell comprising:
The sealing portion includes a contaminant that reduces the activity of the air electrode,
It further includes a coating adsorbing layer that adsorbs the contaminant, covering at least a part of the sealing section on the second partition side.

  The coating adsorption layer covers at least a part of the sealing section on the second partition side. For this reason, the contaminant contained in a sealing part is adsorb | sucked by a coating | coated adsorption layer, the arrival to an air electrode is restrict | limited, and the activity of an air electrode is maintained.

(2) The fuel cell may further include a joining portion that is disposed on the first partition side of the sealing portion and that is composed of a joining material containing Ag that joins the single cell and the separator. .

Even when joining and sealing are achieved by a combination of the joining part and the sealing part, the contaminant contained in the sealing part is restricted from reaching the air electrode, and the activity of the air electrode is maintained.
In addition, it is possible to achieve stronger bonding and sealing by combining a single cell and a separator with a bonding portion made of a bonding material containing Ag and a sealing portion made of glass. .

(3) The contaminant includes at least one of Cr, S, and B.
Since Cr, S, and B are pollutants that reduce the activity of the air electrode, it is preferable to adsorb them with the coating adsorption layer.

In addition, due to the raw material, the contaminant is not only included from the beginning of manufacturing the sealing portion, but may be included later in the sealing portion due to a thermal history or the like. For example, Cr may be contained in the sealing portion due to movement of Cr from a separator or the like. Moreover, Cr may be contained in a sealing part also by a sealing part (glass baking etc.) heat history.
Thus, the contaminant contained in the sealing portion later can also be adsorbed by the coating adsorption layer.

(4) It is preferable that the said coating adsorption layer contains La.
La is preferably contained in the coated adsorption layer because it effectively adsorbs and reacts contaminants, for example, by producing a reaction product of LaBO ₃ .

(5) It is preferable that the said coating adsorption layer coat | covers the whole surface by the side of the said 2nd division of the said sealing part.
The covering adsorption layer covers the entire surface of the sealing portion exposed to the first partition side, so that it is possible to more effectively prevent contaminants from reaching the air electrode.

  ADVANTAGE OF THE INVENTION According to this invention, the fuel cell which aimed at prevention of the poisoning of the air electrode resulting from a sealing material can be provided.

1 is a perspective view of a solid oxide fuel cell stack 10. FIG. 1 is a schematic cross-sectional view of a solid oxide fuel cell stack 10. FIG. 3 is a cross-sectional view of a fuel cell 40. FIG. 3 is a partial perspective view of a fuel battery cell 40. FIG. It is sectional drawing of the fuel cell 40a. It is a partial perspective view of the fuel cell 40a. It is sectional drawing of the fuel battery cell 40b. It is a perspective view of the solid oxide fuel cell stack 10c. It is a schematic cross section of the solid oxide fuel cell stack 10c. It is a schematic cross section of solid oxide fuel cell stack 10d.

  Hereinafter, a solid oxide fuel cell according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view showing a solid oxide fuel cell stack 10 according to a first embodiment of the present invention. The solid oxide fuel cell stack 10 generates power by receiving supply of a fuel gas (for example, hydrogen) and an oxidant gas (for example, air (specifically, oxygen in the air)).

  The solid oxide fuel cell stack 10 includes end plates 11 and 12 and fuel cells 40 (1) to 40 (4) stacked together, bolts 21, 22 (22a, 22b), 23 (23a, 23b) and nuts. It is fixed at 35.

  FIG. 2 is a schematic cross-sectional view of the solid oxide fuel cell stack 10. The solid oxide fuel cell stack 10 is a fuel cell stack configured by stacking fuel cells 40 (1) to 40 (4). Here, for ease of understanding, four fuel cells 40 (1) to 40 (4) are stacked, but generally about 20 to 60 fuel cells 40 are often stacked. .

The end plates 11 and 12 and the fuel cells 40 (1) to 40 (4) have through holes 31 and 32 (32a and 32b) corresponding to the bolts 21 and 22 (22a and 22b) and 23 (23a and 23b), 33 (33a, 33b).
The end plates 11 and 12 are holding plates that press and hold the stacked fuel battery cells 40 (1) to 40 (4), and output current from the fuel battery cells 40 (1) to 40 (4). It is also a terminal.

  3 and 4 are a cross-sectional view and a partial perspective view of the fuel cell 40, respectively. 4 shows the fuel cell 40 in a state where the interconnectors 41 and 45, the current collector 42, the air electrode frame 51, the insulating frame 52, and the fuel electrode frame 54 are removed.

  As shown in FIG. 3, the fuel cell 40 is a so-called fuel electrode support membrane type fuel cell 40, and includes a single cell 44, interconnectors 41 and 45, current collectors 42 and 49, and a frame portion 43. .

  The unit cell 44 includes a solid electrolyte layer 56 sandwiched between an air electrode (also referred to as a cathode or an air electrode layer) 55 and a fuel electrode (also referred to as an anode or a fuel electrode layer) 57. An air electrode 55 and a fuel electrode 57 are disposed on the oxidant gas channel 47 side and the fuel gas channel 48 side of the solid electrolyte layer 56, respectively.

  As the air electrode 55, a perovskite oxide (for example, LSCF (lanthanum strontium cobalt iron oxide), LSM (lanthanum strontium manganese oxide), or the like can be used.

  For the solid electrolyte layer 56, materials such as YSZ (yttria stabilized zirconia), ScSZ (scandia stabilized zirconia), SDC (samarium doped ceria), GDC (gadolinium doped ceria), and perovskite oxide can be used.

  The fuel electrode 57 is preferably a metal, and Ni, Ni and ceramic cermets, or Ni-based alloys can be used.

  The interconnectors 41 and 45 are plate-like members having conductivity (for example, a metal such as stainless steel) that can secure conduction between the single cells 44 and prevent gas mixing between the single cells 44. is there.

  Note that only one interconnector (41 or 45) is disposed between the single cells 44 (because one interconnector is shared between two single cells 44 connected in series). Further, in each of the uppermost layer and the lowermost unit cell 44, conductive end plates 11 and 12 are arranged in place of the interconnectors 41 and 45, respectively.

  The current collector 42 is for ensuring electrical connection between the single cell 44 (air electrode 55) and the interconnector 41, and is, for example, a convex portion formed on the interconnector 41.

  The current collector 49 is disposed inside the fuel gas flow path 48 and is used to ensure electrical continuity between the fuel electrode 57 of the single cell 44 and the interconnector 45. The current collector 49 includes a conductive member 491 and a spacer 492. Have.

  The conductive member 491 has a U shape and abuts on the interconnector 62 (interconnector body 621) and the fuel electrode 57 of the single cell 44.

  The spacer 492 is disposed between the conductive members 491. As the material of the spacer 492, any one of mica, alumina, vermiculite, carbon fiber, silicon carbide fiber, and silica itself or at least one of them as a main component can be used.

  Note that the current collector 49 may be formed of, for example, Ni porous metal, a metal mesh, or a wire instead of the conductive member 491 and the spacer 492. Further, the current collector 49 may be formed of a metal resistant to oxidation such as Ni alloy or stainless steel in addition to Ni.

  The frame portion 43 has an opening 46 through which an oxidant gas and a fuel gas flow. The opening 46 is kept airtight and is divided into an oxidant gas passage 47 through which an oxidant gas flows and a fuel gas passage 48 through which fuel gas flows. Further, the frame portion 43 of this embodiment includes an air electrode frame 51, an insulating frame 52, a metal separator 53, and a fuel electrode frame 54.

  The air electrode frame 51 is a metal frame disposed on the air electrode 55 side, and has an opening 46 at the center. The oxidant gas flow path 47 is defined by the opening 46.

The insulating frame 52 is a frame that electrically insulates between the interconnectors 41 and 45 and between the interconnector 41 and the metal separator 53. For example, ceramics such as Al ₂ O ₃ , mica, vermiculite, etc. It can be used and has an opening 46 in the center. The oxidant gas flow path 47 is defined by the opening 46. Specifically, the insulating frame 52 is disposed between the interconnectors 41 and 45 such that one surface is in contact with the air electrode frame 51 and the other surface is in contact with the metal separator 53. As a result, the insulating frame 52 electrically insulates between the interconnectors 41 and 45 and between the interconnector 41 and the metal separator 53.

  The metal separator 53 is a frame-shaped metal thin plate (for example, thickness: 0.1 mm) having an opening 58, and is joined to the solid electrolyte layer 56 of the single cell 44 or the sealing portion 62 or its sealing portion 62. It is a metal frame that is joined and sealed via both and prevents mixing of oxidant gas and fuel gas. The metal separator 53 divides the gap in the opening 46 of the frame portion 43 into an oxidant gas flow path 47 and a fuel gas flow path 48, thereby preventing mixing of the oxidant gas and the fuel gas.

  The fuel gas channel 48 and the oxidant gas channel 47 correspond to the first section to which the fuel gas is supplied and the second section to which the oxidant gas is supplied, respectively.

  An opening 58 is formed in the metal separator 53 by a through-hole penetrating between the upper surface and the lower surface of the metal separator 53, and the air electrode 55 of the single cell 44 is disposed in the opening 58. The single cell 44 is joined and sealed in the opening 58. The metal separator 53 corresponds to a separator that separates the first compartment to which the fuel gas is supplied and the second compartment to which the oxidant gas is supplied.

The fuel electrode frame 54 is a frame disposed on the fuel electrode 57 side. For example, ceramics such as Al ₂ O ₃ , insulating materials such as mica and vermiculite, metal plates, and the like can be used, and the fuel electrode frame 54 is disposed on the fuel electrode 57 side. The insulating frame has an opening 46 at the center. The fuel gas flow path 48 is defined by the opening 46.

  Bolts 21 and 22 (22a and 22b) and 23 (23a and 23b) are inserted into the air electrode frame 51, the insulating frame 52, the metal separator 53, and the fuel electrode frame 54, or an oxidizing gas or a fuel gas is inserted. The through holes 31, 32 (32a, 32b), 33 (33a, 33b) that circulate are provided in the respective peripheral portions.

(Details of fuel cell 40)
The fuel battery cell 40 according to the present embodiment includes a joining portion 61, a sealing portion 62, and a coating adsorption layer 63.

  The joining portion 61 is made of a brazing material containing Ag, and joins the single cell 44 and the metallic separator 53. The joining portion 61 is disposed over the entire circumference of the opening 58 between the single cell 44 and the metal separator 53 and on the fuel gas flow path 48 (first section) side of the sealing portion 62. The joining portion 61 (Ag solder) has, for example, a width of 2 to 6 mm and a thickness of 10 to 80 μm.

As the material of the joining portion 61, various brazing materials mainly composed of Ag can be employed. For example, as a brazing material, a mixture of Ag and an oxide, for example, Ag-Al ₂ O ₃ (a mixture of Ag and Al ₂ O ₃ (alumina)) can be used. Ag and The mixture of _{oxides, Ag-CuO, Ag-TiO} 2, Ag-Cr 2 O 3, Ag-SiO 2 can also be mentioned. Further, an alloy of Ag and another metal (for example, Ag-Ge-Cr, Ag-Ti, Ag-Al) can be used as the brazing material.

  A brazing material containing Ag (Ag brazing) is hardly oxidized at the brazing temperature even in an air atmosphere. For this reason, the single cell 44 and the metal separator 53 can be joined in an air atmosphere using Ag brazing, which is preferable in terms of process efficiency.

  The sealing part 62 seals the joint part and can be divided into a sealing part 621, a restraining part 622, and a connecting part 623.

  The sealing portion 621 is disposed on the opening 58 side (inner peripheral side) from the bonding portion 61 along the opening 58 over the entire circumference, and the oxidant gas in the opening 58 of the metallic separator 53. In order to prevent mixing with the fuel gas outside the opening 58, the space between the single cell 44 and the metallic separator 53 is sealed.

Since the sealing portion 621 is disposed on the opening 58 side (inner peripheral side) from the joint portion 61, the joint portion 61 does not come into contact with the oxidant gas, and the joint portion from the oxidant gas flow path 47 side is eliminated. Oxygen transfer to 61 is blocked. As a result, it is possible to prevent a gas leak from occurring in the junction 61 due to the reaction between hydrogen and oxygen.
The sealing part 621 has, for example, a width of 0.2 to 4 mm and a thickness of 10 to 80 μm.

The restraining portion 622 is disposed over the entire circumference of the opening 58 on the upper surface of the metallic separator 53 at a position facing the sealing portion 62 with the metallic separator 53 interposed therebetween.
The restraining part 622 is made of the same material (same thermal expansion coefficient) as the sealing part 62, and sandwiches the metallic separator 53 together with the sealing part 62. As a result, deformation of the metal separator 53 during operation of the solid oxide fuel cell stack 10 is suppressed. Since the restraining effect is small when the restraining portion 622 is thin, it is preferable that the restraining portion 622 has a thickness equal to or greater than that of the sealing portion 62.

  The connecting part 623 connects the sealing part 621 and the restraining part 622 and integrates them. Since the sealing portion 621 and the restraining portion 622 are integrated, it is possible to further suppress deformation (deflection) of the metallic separator 53.

  Further, the integration of the sealing portion 621 and the restraining portion 622 contributes to a substantial increase in the width of the sealing portion 62, that is, a so-called seal path, and the sealing performance by the sealing portion 62 is improved. Since the sealing part 621 and the restraining part 622 are integrated, the length (seal path) of the sealing part 62 on the path from the oxidant gas flow path 47 to the joint part 61 becomes long. As a result, the sealing performance by the sealing portion 62 is further improved.

For the sealing part 62, a sealing material containing glass, specifically, glass, glass ceramics (crystallized glass), or a composite of glass and ceramics can be used. As an example, glass manufactured by SCHOTT: G018-311 can be used.
Here, the sealing material (glass or the like) of the sealing portion 62 often contains contaminants such as Si, B, S, and alkali metal, which may cause a decrease in the activity of the air electrode 55.

  Contaminants in the sealing part 62 are more difficult to deal with than contaminants in the oxidant gas. That is, contaminants such as Si, B, and S may be contained in the oxidant gas (for example, the atmosphere), but the contaminants can be removed by providing an adsorbent material (filter) such as activated carbon upstream of the oxidant gas. It is possible to suppress trapping (adsorption) and reaching the air electrode 55. On the other hand, it is difficult for the contaminants scattered from the sealing portion 62 to be effectively trapped by the filter. The sealing portion 62 is in the vicinity of the air electrode 55, and contaminants scattered from the sealing portion 62 become a problem. The sealing portion 62 is exposed on the upstream side of the oxidant gas with respect to the air electrode 55, and there is a concern that the air electrode 55 is contaminated with contaminants.

  By using the coating adsorption layer 63, the contamination of the air electrode 55 due to the contaminant in the sealing portion 62 can be reduced, and the activity of the air electrode 55 can be maintained. The covering adsorption layer 63 adsorbs the contaminant from the sealing portion 62 and prevents the contaminant from scattering into the oxidant gas flow path 47. The covering adsorption layer 63 is in contact with the sealing portion 62 and adsorbs the contaminants that have moved from the sealing portion 62. That is, the coating adsorbing layer 63 does not adsorb the contaminants scattered from the sealing portion 62 into the oxidant gas flow path 47 but adsorbs the contaminants before scattering into the oxidant gas flow path 47. .

  Here, the covering adsorption layer 63 covers the entire surface of the sealing portion 62 on the side of the oxidizing gas channel 47 (second section). The covering adsorption layer 63 covers the entire surface of the sealing portion 62, thereby reliably preventing the air electrode 55 from being contaminated by the contaminant in the sealing portion 62. However, the coating adsorbing layer 63 may also poison the air electrode 55 due to contaminants in the sealing portion 62 by covering only a part of the surface of the sealing portion 62 on the oxidant gas flow path 47 (second section) side. Can be reduced.

The coated adsorbing layer 63 is made of a material containing La, specifically, a material (perovskite-based material) that is the same as or similar to the air electrode 55 such as LSCF, LSM, LSC, LSF, LNF, and LC as follows. Available.
LSCF: (La, Sr) (Co, Fe) O ₃
LSM: (La, Sr) MnO ₃
LSC: (La, Sr) CoO ₃
LSF: (La, Sr) FeO ₃
LNF: La (Ni, Fe) O ₃
LC: LaCrO ₃

La contained in the coating adsorption layer 63 reacts with B to form LaBO ₃ . For this reason, when B in the sealing material (glass) of the sealing part 62 evaporates from the sealing material, it reacts and traps chemically.

The coating adsorbing layer 63 can be formed by screen printing, dispensing application, spray application, or the like on the sealing portion 62.
Although not shown, the above-described fuel cell stack 10 is housed in a casing together with other equipment to constitute a fuel cell.

  In the present embodiment, by covering the sealing portion 62 with the coating adsorption layer 63, poisoning of the air electrode 55 can be prevented, its deterioration can be suppressed over a long period, and long-term reliability can be improved.

(Modification 1 of the first embodiment)
5 and 6 are a cross-sectional view and a partial perspective view, respectively, of a fuel cell 40a of a solid oxide fuel cell stack according to Modification 1 of the first embodiment of the present invention. The description of the same parts as those in the first embodiment is omitted.

  Unlike the fuel battery cell 40, the fuel battery cell 40 a does not have the restraining part 622 and the connecting part 623. The coating adsorption layer 63a covers part or all of the surface exposed to the oxidant gas flow path 47 side of the sealing part 621, adsorbs contaminants from the sealing part 621, and the contaminants flow into the oxidant gas flow. It is prevented from being scattered in the road 47.

(Modification 2 of the first embodiment)
FIG. 7 is a cross-sectional view of a fuel cell 40b of a solid oxide fuel cell stack according to Modification 2 of the first embodiment of the present invention. The description of the same parts as those in the first embodiment is omitted.

  Unlike the fuel battery cell 40a, the fuel battery cell 40b does not have the joint portion 61. The sealing portion 621 b joins between the metallic separator 53 and the single cell 44 in place of the joining portion 61. That is, the sealing portion 621b collectively performs the bonding and sealing between the metallic separator 53 and the single cell 44.

  Even in this case, the coating adsorption layer 63a covers part or all of the surface of the sealing portion 621b on the side of the oxidant gas flow path 47 (second section), thereby preventing the air electrode 55 from being poisoned and extending over a long period of time. Therefore, the deterioration can be suppressed and the long-term reliability can be improved.

(Second Embodiment)
8 and 9 are a perspective view and a cross-sectional view, respectively, of a solid oxide fuel cell stack 10c according to the second embodiment of the present invention.

  The solid oxide fuel cell stack 10c includes a single cell 44c, a manifold 70, a joining portion 61c, a sealing portion 62c, and a coated adsorption layer 63c.

  The single cell 44c is a hollow flat plate type and has an elliptic cylinder shape (flat cylindrical shape). The single cell 44 c includes an electrode support 410, a fuel electrode 420, a solid electrolyte layer 430, and an air electrode 440.

  The electrode support 410 has an elliptic cylinder shape (flat cylindrical shape), and has gas permeability and conductivity. The electrode support 410 has a plurality of fuel gas passage holes 411. The fuel gas that has entered the fuel gas passage hole 411 from the manifold 70 passes through the electrode support 410 and reaches the fuel electrode 420.

  The fuel electrode 420 is disposed on the outer periphery of the electrode support 410. The solid electrolyte layer 430 is disposed on the outer periphery of the fuel electrode 420. The air electrode 440 is disposed on the outer periphery of the solid electrolyte layer 430.

  Here, the single cell 44c and the electrode support 410 have an elliptic cylinder shape (flat cylindrical shape), but the single cell 44c and the electrode support 410 may have a cylindrical shape. For example, a single fuel gas passage hole 411 disposed in the electrode support 410 is used, and the electrode support 410 has a cylindrical shape coaxial with the fuel gas passage hole 411.

  The manifold 70 has an internal space 71, an opening 72, and a fuel injection port 73. The fuel gas is injected into the internal space 71 from the fuel injection port 73, passes through the opening 72 and the fuel gas passage hole 411, passes through the electrode support 410, and reaches the fuel electrode 420. The reacted fuel gas is discharged from the fuel gas passage hole 411 to the outside.

  The internal space 71, the fuel gas passage hole 411, and the electrode support 410 correspond to the first section to which the fuel gas is supplied. Since the electrode support 410 has gas permeability, the electrode support 410 permeates the fuel gas and corresponds to the first section to which the fuel gas is supplied.

On the other hand, the oxidant gas (atmosphere) exists outside the manifold 70 and the single cell 44b. That is, the outside of the manifold 70 and the single cell 44b corresponds to the second section to which the oxidant gas is supplied.
The manifold 70 corresponds to a separator that separates a first section to which fuel gas is supplied and a second section to which oxidant gas is supplied.

  The joining part 61 c joins and fixes the plurality of single cells 44 c in the opening 72. As the material of the joint portion 61 c, various brazing materials mainly composed of Ag can be employed as in the joint portion 61.

  The sealing part 62c seals the joining part 61c. Similar to the sealing portion 62, a sealing material containing glass, specifically, glass, glass ceramics (crystallized glass), or a composite of glass and ceramics can be used for the sealing portion 62c.

The covering adsorption layer 63 c covers the entire surface of the sealing portion 62. The covering adsorption layer 63c adsorbs the contaminant from the sealing portion 62c and prevents the contaminant from reaching the air electrode 440. Similar to the coating adsorption layer 63, perovskite materials (LSCF, LSM, LSC, LSF, LNF, LC, etc.) can be used for the coating adsorption layer 63c.
Although not shown, the above-described fuel cell stack is housed in a casing together with other equipment to constitute a fuel cell.

(Modification of the second embodiment)
FIG. 10 is a cross-sectional view of a solid oxide fuel cell stack 10d according to a modification of the second embodiment of the present invention.
In the solid oxide fuel cell stack 10c, the joint portion 61c joins and fixes the plurality of single cells 44c together in the opening 72. On the other hand, in the solid oxide fuel cell stack 10d, the plurality of joints 61d individually join and fix the plurality of single cells 44c in the plurality of openings 72d.

  In other respects, the solid oxide fuel cell stack 10d is not substantially different from the solid oxide fuel cell stack 10c, and a detailed description thereof will be omitted.

In the second embodiment and its modification, the joining portion 61d made of a brazing material is sealed with a sealing portion 62d made of a sealing material containing glass. That is, the joining part 61d and the sealing part 62d share joining and sealing, respectively.
On the other hand, as shown in the modified example 2 of the first embodiment, it is possible to collectively perform bonding and sealing using a sealing portion made of a material containing glass. In this case, by covering the sealing portion with the covering adsorption layer 63d, poisoning of the air electrode 440 can be prevented, deterioration thereof can be suppressed over a long period, and long-term reliability can be improved.

(Other embodiments)
Embodiments of the present invention are not limited to the above-described embodiments, and can be expanded and modified. The expanded and modified embodiments are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Solid oxide fuel cell 11,12 End plate 21,22 Bolt 31,32 Through hole 35 Nut 40 Fuel cell 41,45 Interconnector 42 Current collector 43 Frame part 44 Single cell 46 Opening 47 Oxidant gas flow path 48 Fuel gas flow path 49 Current collector 491 Conductive member 492 Spacer 51 Air electrode frame 52 Insulating frame 53 Metal separator 54 Fuel electrode frame 55 Air electrode 56 Solid electrolyte layer 57 Fuel electrode 58 Opening 61 Joint 62 Sealing part 621, 621a, 621b Sealing part 622 Restraining part 623 Connecting part 63, 63a, 63c, 63d Covering adsorption layer 70 Manifold 71 Internal space 72 Opening part 73 Fuel inlet 410 Electrode support 411 Fuel gas passage hole 420 Fuel electrode 430 Solid Electrolyte layer 440 Air electrode

Claims (5)

A separator that separates a first compartment supplied with fuel gas and a second compartment supplied with oxidant gas;
The fuel electrode disposed in the first section, the air electrode disposed in the second section, and the solid disposed between the fuel electrode and the air electrode, with the fuel electrode and the air electrode being separated. A single cell having an electrolyte layer;
A sealing part that includes glass and joins and seals the single cell and the separator;
A fuel cell comprising:
The sealing portion includes a contaminant that reduces the activity of the air electrode,
The fuel cell according to claim 1, further comprising a coating adsorbing layer that covers at least a part of the sealing portion on the second partition side and adsorbs the contaminant. A bonding portion that is arranged on the first partition side of the sealing portion and that is made of a bonding material containing Ag, which bonds the single cell and the separator;
The fuel cell according to claim 1, further comprising: The fuel cell according to claim 1 or 2, wherein the contaminant includes at least one of Cr, S, and B. The fuel cell according to any one of claims 1 to 3, wherein the coating adsorption layer includes La. The fuel cell according to any one of claims 1 to 4, wherein the coating adsorption layer covers the entire surface of the sealing portion on the second partition side.

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