JP2018041557A - Fuel battery cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel battery cell which enables the increase in power generation efficiency.SOLUTION: A fuel battery cell comprises: a support substrate 20; a first power generation element part 10a; and a dense layer 8. The dense layer 8 has no oxygen ion conductivity. The fuel battery cell has a power generation region A, and a non-power generation region B. The power generation region A is a region where a fuel electrode activation part 42, an electrolyte 5, and an air electrode activation part 61 overlap one another. The non-power generation region B is a region other than that. An air electrode current collecting part 62 extends from the power generation region A to the non-power generation region B. The dense layer 8 is disposed between the air electrode current collecting part 62 and the support substrate 20 in the non-power generation region B.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a fuel battery cell.

  The fuel cell includes a support substrate and a power generation element unit supported on the support substrate. The power generation element section includes a fuel electrode current collector, a fuel electrode active part, an electrolyte, an air electrode active part, and an air electrode current collector. A region where the fuel electrode active portion, the electrolyte, and the air electrode active portion overlap is defined as a power generation region, and the other region is defined as a non-power generation region. The support substrate is porous and has a gas flow path. When the fuel gas is supplied to the gas flow path, the fuel gas is supplied to the fuel electrode active portion through the support substrate in the power generation region. In order to prevent the fuel gas from leaking to the air electrode side through the inside of the support substrate in the non-power generation region, the support substrate is covered with an electrolyte.

Japanese Patent Laying-Open No. 2015-76339

  There is a demand for improving power generation efficiency in fuel cells. Then, the subject of this invention is providing the fuel battery cell which can improve electric power generation efficiency.

  The inventor has found that in the non-power generation region, oxygen ions are conducted to the support substrate side through the electrolyte, so that a leak current is generated, and as a result, the power generation efficiency of the fuel cell may be reduced. I found it. Therefore, the fuel cell according to the present invention has the following configuration to suppress the generation of leakage current and improve the power generation efficiency.

A fuel battery cell according to an aspect of the present invention includes a support substrate, a first power generation element portion, and a dense layer. The support substrate has a gas flow path. The support substrate is porous. The first power generation element unit includes a fuel electrode current collector, a fuel electrode active unit, an electrolyte, an air electrode active unit, and an air electrode current collector. The first power generation element unit is supported on a support substrate. The dense layer does not have oxygen ion conductivity. In addition, not having oxygen ion conductivity means that oxygen ion conductivity is 1 × 10 ⁻³ S / cm or less at 750 degrees which is an example of the operating temperature of the fuel cell. The fuel battery cell includes a power generation region and a non-power generation region. The power generation region is a region where the fuel electrode active part, the electrolyte, and the air electrode active part overlap. The non-power generation area is another area. The air electrode current collector extends from the power generation region to the non-power generation region. The dense layer is disposed between the air electrode current collector and the support substrate in the non-power generation region.

  According to this configuration, in the non-power generation region, the dense layer that does not have oxygen ion conductivity is disposed between the air electrode current collector and the support substrate. For this reason, it is possible to prevent oxygen ions in the air electrode current collector from being conducted to the support substrate side, thereby improving the power generation efficiency.

  Preferably, the fuel cell further includes a reaction preventing film. The reaction preventing film is disposed between the electrolyte and the air electrode active part. The reaction preventing film is made of a material containing ceria containing a rare earth element.

  Preferably, the dense layer has the same main component as the support substrate. According to this configuration, the thermal expansion coefficients of the support substrate and the dense layer can be made closer in the non-power generation region. As a result, it can suppress that a crack arises in a support substrate.

  Preferably, the dense layer has the same main component as the support substrate and is disposed so as to cover a pair of side surfaces of the support substrate. When the entire support substrate is covered with the electrolyte, cracks may occur on the pair of side surfaces of the support substrate. On the other hand, since the dense layer has a thermal expansion coefficient close to that of the support substrate by covering the pair of side surfaces of the support substrate with the dense layer, the occurrence of cracks in the dense layer covering the side surface of the support substrate can be suppressed.

  Preferably, the fuel battery cell further includes a second power generation element portion and an interconnector. The second power generation element unit includes a fuel electrode current collector, a fuel electrode active unit, an electrolyte, an air electrode active unit, and an air electrode current collector. The second power generation element portion is supported on the support substrate. The interconnector electrically connects the first power generation element unit and the second power generation element unit. The air current collector part of the first power generation element part extends toward the second power generation element part. The fuel electrode current collector of the second power generation element extends toward the first power generation element. The interconnector electrically connects the air electrode current collector of the first power generating element part and the fuel electrode current collector of the second power generating element part.

  According to the fuel cell according to the present invention, the power generation efficiency can be improved.

The perspective view of a fuel cell stack. Sectional drawing of a fuel cell stack. The perspective view of a fuel manifold. The perspective view of a fuel cell. Sectional drawing of a fuel cell. Sectional drawing of a fuel cell. The figure which shows joining of a fuel battery cell and a fuel manifold. The figure which shows the supply method of air. The figure which shows the electric current which flows through the inside of a fuel cell. The figure which shows the manufacturing method of a fuel cell. The figure which shows the manufacturing method of a fuel cell. The figure which shows the manufacturing method of a fuel cell. The figure which shows the manufacturing method of a fuel cell. The figure which shows the manufacturing method of a fuel cell. The figure which shows the manufacturing method of a fuel cell. The figure which shows the manufacturing method of a fuel cell. The figure which shows the manufacturing method of a fuel cell. Sectional drawing of the fuel battery cell which concerns on a modification. Sectional drawing of the fuel battery cell which concerns on a modification.

  Hereinafter, embodiments of a fuel cell stack using fuel cells according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the fuel cell stack 100 includes a fuel manifold 200 and a plurality of fuel cells 301.

[Fuel manifold]
As shown in FIG. 3, the fuel manifold 200 is configured to distribute the fuel gas to the fuel cells 301. The fuel manifold 200 is hollow and has an internal space. Fuel gas is supplied to the internal space of the fuel manifold 200 through the introduction pipe 201. The fuel manifold 200 has a plurality of through holes 202 arranged at intervals. Each through hole 202 is formed in the top plate 203 of the fuel manifold 200. Each through hole 202 communicates the internal space of the fuel manifold 200 with the outside.

[Fuel battery cell]
As shown in FIG. 2, each fuel cell 301 extends from the fuel manifold 200. Specifically, each fuel cell 301 extends upward (x-axis direction) from the top plate 203 of the fuel manifold 200. That is, the longitudinal direction (x-axis direction) of each fuel cell 301 extends upward. As shown in FIG. 4, the fuel battery cell 301 includes a plurality of power generation element units 10 and a support substrate 20.

[Support substrate]
The support substrate 20 has a plurality of gas passages 21 extending along the longitudinal direction (x-axis direction) of the support substrate 20. Each gas channel 21 extends substantially parallel to each other. As shown in FIG. 5, the support substrate 20 includes a plurality of first recesses 22 and a crosspiece 23 that is disposed between each first recess 22.

  Each first recess 22 is formed on both surfaces of the support substrate 20. The first recesses 22 are arranged at intervals in the longitudinal direction of the support substrate 20. Each first recess 22 is not formed at both ends of the support substrate 20 in the width direction (y-axis direction). Each crosspiece 23 extends in the width direction (y-axis direction) of the support substrate 20.

The support substrate 20 is made of a porous material that does not have electronic conductivity. The support substrate 20 can be made of, for example, CSZ (calcia stabilized zirconia). Alternatively, the support substrate 20 may be made of NiO (nickel oxide) and YSZ (8YSZ) (yttria-stabilized zirconia), or made of NiO (nickel oxide) and Y ₂ O ₃ (yttria). Alternatively, MgO (magnesium oxide) and MgAl ₂ O ₄ (magnesia alumina spinel) may be used. The porosity of the support substrate 20 is, for example, about 20 to 60%.

[Power generation element]
Each power generating element unit 10 is supported on both surfaces of the support substrate 20. Each power generation element unit 10 may be supported only on one side of the support substrate 20. The power generation element units 10 are arranged at intervals in the longitudinal direction of the support substrate 20. That is, the fuel cell 301 according to the present embodiment is a so-called horizontal stripe fuel cell. The power generating element portions 10 adjacent in the longitudinal direction are electrically connected to each other by an interconnector 31. Below, although the 1st power generation element part 10a which is one power generation element part among the several power generation element parts 10 is demonstrated, the other power generation element part 10 is also the same structure.

  The first power generation element unit 10 a includes a fuel electrode 4, an electrolyte 5, and an air electrode 6. The first power generation element unit 10 a further includes a reaction preventing film 7.

[Fuel electrode]
The fuel electrode 4 is a fired body made of a porous material having electron conductivity. The fuel electrode 4 includes a fuel electrode current collector 41 and a fuel electrode active part 42.

[Fuel electrode current collector]
The fuel electrode current collector 41 is disposed in the first recess 22. Specifically, the fuel electrode current collector 41 is filled in the first recess 22 and has the same outer shape as the first recess 22. The fuel electrode current collector 41 has a second recess 411 and a third recess 412. A fuel electrode active portion 42 is disposed in the second recess 411. Further, the interconnector 31 is disposed in the third recess 412.

  The fuel electrode current collector 41 has electronic conductivity. The fuel electrode current collector 41 preferably has higher electron conductivity than the fuel electrode active part 42. The fuel electrode current collector 41 may or may not have oxygen ion conductivity.

The fuel electrode current collector 41 can be composed of, for example, NiO (nickel oxide) and YSZ (8YSZ) (yttria stabilized zirconia). Alternatively, the fuel electrode current collector 41 may be composed of NiO (nickel oxide) and Y ₂ O ₃ (yttria), or composed of NiO (nickel oxide) and CSZ (calcia stabilized zirconia). Also good. The thickness of the fuel electrode current collector 41 and the depth of the first recess 22 are about 50 to 500 μm.

[Fuel electrode active part]
The fuel electrode active portion 42 has oxygen ion conductivity and electronic conductivity. The anode active part 42 has a higher content of oxygen ion conductive material than the anode current collector 41. Specifically, the volume ratio of the substance having oxygen ion conductivity with respect to the total volume excluding the pore portion in the fuel electrode active portion 42 is determined by the oxygen ion conduction in the total volume excluding the pore portion in the fuel electrode current collector 41. It is larger than the volume ratio of the substance having the property.

  The fuel electrode active part 42 may be composed of, for example, NiO (nickel oxide) and YSZ (8YSZ) (yttria stabilized zirconia). Alternatively, the fuel electrode active part 42 may be composed of NiO (nickel oxide) and GDC (gadolinium-doped ceria). The thickness of the fuel electrode active part 42 is 5 to 30 μm.

[Electrolytes]
The electrolyte 5 is disposed so as to cover the fuel electrode 4. Specifically, the electrolyte 5 extends in the longitudinal direction from one interconnector 31 to another interconnector 31. That is, the electrolyte 5 and the interconnector 31 are alternately and continuously arranged in the longitudinal direction (x-axis direction) of the support substrate 20. Thus, the electrolyte 5 is configured to cover a pair of main surfaces of the support substrate 20.

  The electrolyte 5 is a fired body made of a dense material that has ionic conductivity and no electronic conductivity. The electrolyte 5 can be made of, for example, YSZ (8YSZ) (yttria stabilized zirconia). Or the electrolyte 5 may be comprised from LSGM (lanthanum gallate). The thickness of the electrolyte 5 is, for example, about 3 to 50 μm.

[Reaction prevention film]
The reaction preventing film 7 is a fired body composed of a dense material. The reaction preventing film 7 is disposed between the electrolyte 5 and the air electrode active part 61. The reaction preventing film 7 suppresses occurrence of a phenomenon in which YSZ in the electrolyte 5 and Sr in the air electrode 6 react to form a reaction layer having a large electric resistance at the interface between the electrolyte 5 and the air electrode 6. Is provided. The reaction preventing film 7 does not extend to the fuel electrode current collecting part 41 of the second power generating element part 10b which is the adjacent power generating element part 10.

The reaction preventing film 7 is made of a material containing ceria containing a rare earth element. The reaction preventing film 7 can be made of, for example, GDC = (Ce, Gd) O ₂ (gadolinium-doped ceria). The thickness of the reaction preventing film 7 is, for example, about 3 to 50 μm.

[Air electrode]
The air electrode 6 is a fired body composed of a porous material having electron conductivity. The air electrode 6 is disposed on the opposite side of the fuel electrode 4 with the electrolyte 5 interposed therebetween. The air electrode 6 includes an air electrode active part 61 and an air electrode current collector 62.

[Air electrode active part]
The air electrode active part 61 is disposed on the reaction preventing film 7. The air electrode active part 61 has oxygen ion conductivity and electron conductivity. The air electrode active part 61 has a higher content of a substance having oxygen ion conductivity than the air electrode current collecting part 62. Specifically, the volume ratio of the substance having oxygen ion conductivity with respect to the total volume excluding the pore portion in the air electrode active portion 61 is determined by the oxygen ion conductivity in the air electrode current collector 62 with respect to the total volume excluding the pore portion. It is larger than the volume ratio of the substance having properties.

The air electrode active part 61 can be composed of, for example, LSCF = (La, Sr) (Co, Fe) O ₃ (lanthanum strontium cobalt ferrite). Alternatively, the air electrode active part 61 may have LSF = (La, Sr) FeO ₃ (lanthanum strontium ferrite), LNF = La (Ni, Fe) O ₃ (lanthanum nickel ferrite), or LSC = (La, Sr) CoO. ₃ (lanthanum strontium cobaltite) or the like. The air electrode active part 61 may be configured by two layers of a first layer (inner layer) composed of LSCF and a second layer (outer layer) composed of LSC. The thickness of the air electrode active part 61 is, for example, 10 to 100 μm.

  A region where the air electrode active part 61, the electrolyte 5, and the fuel electrode active part 42 overlap is defined as a power generation region A. Further, other regions, that is, regions other than the power generation region A are defined as non-power generation regions B.

[Air electrode current collector]
The air electrode current collector 62 is disposed on the air electrode active part 61. The air electrode current collector 62 extends from the air electrode active part 61 toward the second power generation element part 10b. That is, the air electrode current collector 62 extends from the power generation region A to the non-power generation region B.

  The air electrode current collector 62 is a fired body made of a porous material having electronic conductivity. The air electrode current collector 62 preferably has higher electron conductivity than the air electrode active part 61. The air electrode current collector 62 may or may not have oxygen ion conductivity.

The air electrode current collector 62 can be made of, for example, LSCF = (La, Sr) (Co, Fe) O ₃ (lanthanum strontium cobalt ferrite). Alternatively, the air electrode current collector 62 may be made of LSC = (La, Sr) CoO ₃ (lanthanum strontium cobaltite). Or the air electrode current collection part 62 may be comprised from Ag (silver) and Ag-Pd (silver palladium alloy). The thickness of the air electrode current collector 62 is, for example, about 50 to 500 μm.

[Interconnector]
The interconnector 31 is configured to electrically connect the first power generation element portion 10a and the second power generation element portion 10b adjacent to each other in the longitudinal direction (x-axis direction) of the support substrate 20. Specifically, the air electrode current collector 62 of the first power generation element portion 10a extends toward the second power generation element portion 10b. Further, the fuel electrode current collector 41 of the second power generation element portion 10b extends toward the first power generation element portion 10a. The interconnector 31 electrically connects the air electrode current collector 62 of the first power generating element unit 10a and the fuel electrode current collector 41 of the second power generating element unit 10b. The interconnector 31 is disposed in the third recess 412 of the fuel electrode current collector 41. Specifically, the interconnector 31 is embedded in the third recess 412.

The interconnector 31 is a fired body composed of a dense material having electronic conductivity. The interconnector 31 can be made of, for example, LaCrO ₃ (lanthanum chromite). Alternatively, the interconnector 31 may be made of (Sr, La) TiO ₃ (strontium titanate). The thickness of the interconnector 31 is, for example, 10 to 100 μm.

[Dense layer]
In the non-power generation region B, the dense layer 8 is disposed between the air electrode current collector 62 and the support substrate 20. Specifically, the dense layer 8 is disposed between the electrolyte 5 formed on the support substrate 20 and the air electrode current collector 62. The dense layer 8 preferably covers 60% or more of the crosspieces 23 in the longitudinal direction (x-axis direction) of the support substrate 20, and more preferably covers the whole crosspieces 23. Further, as shown in FIG. 4, the dense layer 8 preferably covers a pair of side surfaces of the support substrate 20.

The dense layer 8 does not have oxygen ion conductivity. Specifically, the oxygen ion conductivity of the dense layer 8 is 1 × 10 ⁻³ S / cm or less at 750 degrees which is an example of the operating temperature of the fuel cell 100. The dense layer 8 is made of a dense material. For example, the porosity of the dense layer 8 can be about 10% or less. The dense layer 8 has the same main component as the support substrate 20. For example, the dense layer 8 can be composed of MgO, Y ₂ O ₃ , MgAl ₂ O ₄ , or the like.

[Current collecting member]
The fuel cell 301 configured as described above is electrically connected to the adjacent fuel cell 301 by the current collecting member 302. As shown in FIG. 2, the current collecting member 302 is disposed between the pair of fuel cells 301. And the current collection member 302 has electroconductivity so that the fuel cell 301 adjacent in the thickness direction (z-axis direction) may be electrically connected. Specifically, the current collecting member 302 connects adjacent fuel cells 301 on the gas supply side 303 of the fuel cells 301. The current collecting member 302 is disposed on the gas supply side with respect to the proximal end side power generation element portion 10a. Specifically, as shown in FIG. 6, the current collecting member 302 is disposed on the air electrode current collecting portion 62 extending from the power generating element portion 10 disposed on the base end side.

The current collecting member 302 has a block shape. For example, the current collecting member 302 has a rectangular parallelepiped shape or a cylindrical shape. The current collecting member 302 is made of, for example, a fired body of oxide ceramics. Examples of such oxide ceramics include perovskite oxide and spinel oxide. Examples of the perovskite oxide include (La, Sr) MnO ₃ , (La, Sr) (Co, Fe) O _{3, and the} like. Examples of the spinel oxide include (Mn, Co) ₃ O ₄ , (Mn, Fe) ₃ O _{4, and the} like. For example, the current collecting member 302 does not have flexibility.

The current collecting member 302 is joined to each fuel cell 301 by the first joining material 101. That is, the first bonding material 101 joins each current collecting member 302 and each fuel cell 301. The first bonding material 101 is, for example, at least one selected from the group consisting of (Mn, Co) ₃ O ₄ , (La, Sr) MnO _3, (La, Sr) (Co, Fe) O _{3, and the} like. .

  As shown in FIG. 2, each fuel cell 301 is supported by the fuel manifold 200. Specifically, each fuel cell 301 is fixed to the top plate 203 of the fuel manifold 200 by the second bonding material 102. More specifically, as shown in FIG. 7, each fuel cell 301 is inserted into the through hole 202 of the fuel manifold 200. The fuel cell 301 is fixed to the fuel manifold 200 by the second bonding material 102 in a state of being inserted into the through hole 202.

The second bonding material 102 is filled in the through hole 202 in a state where the fuel battery cell 301 is inserted. That is, the second bonding material 102 is filled in a gap between the outer peripheral surface of the fuel cell 301 and the wall surface that defines the through hole 202. The second bonding material 102 is, for example, crystallized glass. As the crystallized glass, for example, a SiO ₂ —B ₂ O ₃ system, a SiO ₂ —CaO system, or a SiO ₂ —MgO system may be employed. In this specification, crystallized glass means that the ratio (crystallinity) of “volume occupied by crystal phase” to the total volume is 60% or more, and “volume occupied by amorphous phase and impurities relative to the total volume”. "Indicates a glass having a ratio of less than 40%. As the material of the second bonding material 102, amorphous glass, brazing material, ceramics, or the like may be employed. Specifically, the second bonding material 102 is at least one selected from the group consisting of SiO ₂ —MgO—B ₂ O ₅ —Al ₂ O ₃ and SiO ₂ —MgO—Al ₂ O ₃ —ZnO. .

  The length of each fuel cell 301 protruding from the fuel manifold 200 in the longitudinal direction (x-axis direction) can be about 100 to 300 mm. The fuel cells 301 are arranged at intervals in the thickness direction (z-axis direction) of the fuel cells 301. The interval between the fuel cells 301 can be about 1 to 5 mm.

[Power generation method]
The fuel cell stack 100 configured as described above generates power as follows. A fuel gas (hydrogen gas or the like) is caused to flow into the gas flow path 21 of each fuel cell 301 through the fuel manifold 200, and both surfaces of the support substrate 20 are exposed to a gas (air or the like) containing oxygen.

  For example, as shown in FIG. 8, the gas containing oxygen is supplied to the gas supply side from the power generation element unit 10 on the base end side so as to flow along the width direction (y-axis direction). Specifically, the fuel cell stack 100 further includes a gas supply member 400. The gas supply member 400 is configured to supply a gas such as air between the fuel cells 301. Note that the guide plate 401 may be installed on the opposite side of the gas supply member 400 so that the gas supplied from the gas supply member 400 efficiently flows upward. The guide plate 401 has a flat plate shape and extends in the longitudinal direction of the fuel cell 301 and also extends in the thickness direction of the fuel cell 301.

As described above, in each power generation element unit 10 supplied with the fuel gas and the gas containing oxygen, an electromotive force is generated due to an oxygen partial pressure difference generated between both side surfaces of the electrolyte 5. When this fuel cell stack 100 is connected to an external load, an electrochemical reaction represented by the following formula (1) occurs in the air electrode 6, and an electrochemical reaction represented by the following formula (2) occurs in the fuel electrode 4, causing a current to flow. .
(1/2) · O ₂ + 2e ⁻ → O ₂ ⁻ (1)
H ₂ + O ₂ ⁻ → H ₂ O + 2e ⁻ (2)
In the power generation state, current flows as shown by arrows in FIG. In the interconnector 31 and the power generation element unit 10, a current flows in the thickness direction.

[Production method]
Next, a method for manufacturing the fuel battery cell configured as described above will be described. 10 to 17, “g” at the end of the reference numeral of each member indicates that the member is not fired.

First, as shown in FIG. 10, a support substrate molded body 20g is prepared. The support substrate molded body 20g is formed by, for example, a method such as extrusion molding or cutting using a slurry obtained by adding a binder or the like to the powder of the material of the support substrate 20 (for example, MgO—MgAl ₂ O ₄ ). It can be made using.

  When the support substrate molded body 20g is manufactured, next, as shown in FIG. 11, the first recesses 22 in the upper and lower surfaces of the support substrate molded body 20g are filled with the molded body 41g of the fuel electrode current collector. To do. The molded body 41g of the fuel electrode current collector is produced by, for example, a printing method using a slurry obtained by adding a binder or the like to the powder of the material of the fuel electrode current collector 41 described above.

  Next, as shown in FIG. 12, a molded film 42 g of the fuel electrode active portion is formed in each second recess 411 of the molded body 41 g of the fuel electrode current collector. The formed film 42g is formed by, for example, a printing method using a slurry obtained by adding a binder or the like to the powder of the material for the fuel electrode active portion 42 described above.

  Also, an interconnector molded film 31g is formed in each third recess 412 of the molded body 41g of each fuel electrode current collector. The molded film 31g of each interconnector is formed by, for example, a printing method using a slurry obtained by adding a binder or the like to the powder of the material of the interconnector 31 described above.

  Next, as shown in FIG. 13, an electrolyte molding film 5g is formed on the molding film 42g of the fuel electrode active portion. Specifically, one end portion of the electrolyte molding film 5g is disposed on the molding film 31g of the interconnector of the first power generation element portion 10a, and the other end portion of the electrolyte molding film 5g is the second end portion. It arrange | positions on the shaping | molding film | membrane 31g of the interconnector of the electric power generation element part 10b. Thereby, the main surfaces of the molded body 41g of the fuel electrode current collector and the molded body 20g of the support substrate in which the molded film 42g of the fuel electrode active part is formed are formed on the main surface of the interconnector molded film 31g and the electrolyte. It is covered with a molding film 5g. The electrolyte molded film 5g is formed by, for example, a printing method or a dipping method using a slurry obtained by adding a binder or the like to the powder of the material of the electrolyte 5 described above.

  Next, as shown in FIG. 14, a reaction preventive film 7g is formed on the electrolyte film 5g. The molded film 7g of each reaction preventing film is formed by, for example, a printing method using a slurry obtained by adding a binder or the like to the powder of the material of the reaction preventing film 7 described above.

  Next, as shown in FIG. 15, a dense molding film 8g is formed on the electrolyte molding film 5g. More specifically, the dense molded film 8g is formed so as to cover a portion of the molded electrolyte film 5g extending from the reaction preventing film 7g toward the second power generation element portion 10b.

  Then, 20 g of the support substrate molded body in which various molded films are thus formed is fired in air at about 1200 to 1500 ° C. for about 1 to 5 hours. Thereby, the fuel battery cell in the state where the air electrode 6 is not formed is obtained.

  Next, as shown in FIG. 16, a forming film 61 g of the air electrode active portion is formed on each reaction preventing film 7. The molded film 61g of each air electrode active portion is formed by a printing method or the like using a slurry obtained by adding a binder or the like to the powder of the material of the air electrode active portion 61 described above.

  Next, as shown in FIG. 17, the air electrode current collector is formed so as to straddle the forming film 61g of the air electrode active part of the first power generating element part 10a and the interconnector 31 of the second power generating element part 10b. A film 62g is formed. That is, the molding film 62g of the air electrode current collector is formed on the molding film 61g of the air electrode active part, the electrolyte 5, the seal part 32, and the interconnector 31. The molded film 62g of each air electrode current collector is formed by, for example, a printing method using a slurry obtained by adding a binder or the like to the powder of the material of the air electrode current collector 62 described above.

  The support substrate 20 in which the air electrode forming films 61g and 62g are thus formed is baked in the air at about 800 to 1200 ° C. for about 1 to 5 hours. Thereby, the fuel cell 301 is completed.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention.

Modification 1
In the above embodiment, the support substrate 20 has a flat plate shape, but may have a cylindrical shape. That is, the fuel battery cell 301 may be cylindrical.

Modification 2
In the above embodiment, the fuel electrode current collector 41 has the second recess 411 and the third recess 412, but the configuration of the fuel electrode current collector 41 is not limited to this. For example, the fuel electrode current collector 41 may not have concave portions such as the second concave portion 411 and the third concave portion 412. In this case, the anode active portion 42 is formed on the anode current collector 41 and is not embedded in the anode current collector 41. The interconnector 31 is formed on the anode current collector 41 and is not embedded in the anode current collector 41.

Modification 3
As shown in FIG. 18, the fuel battery cell may include a seal portion 32 arranged so as to surround the interconnector 31. For example, the seal part 32 is annular. The seal part 32 has electrical insulation. That is, the seal part 32 does not have electronic conductivity. The seal portion 32 can be made of, for example, MgO or CZO. In this case, the electrolyte 5 extends from the seal portion 32 of the first power generation element portion 10a to the seal portion 32 of the second power generation element portion 10b. The dense layer 8 extends to the seal portion 32 of the second power generation element portion and does not contact the interconnector 31.

Modification 4
In the said embodiment, although the electrolyte 5 is extended to the interconnector 31 of the 2nd electric power generation element part 10b, the structure of the electrolyte 5 is not limited to this. For example, as shown in FIG. 19, the electrolyte 5 may not extend to the crosspiece 23 of the support substrate 20. In this case, the dense layer 8 is disposed on the crosspiece 23.

DESCRIPTION OF SYMBOLS 301 Fuel cell 20 Support substrate 21 Gas flow path 10a 1st power generation element part 41 Fuel electrode current collection part 42 Fuel electrode active part 5 Electrolyte 61 Air electrode active part 62 Air electrode current collection part 8 Dense layer A Power generation area B Non-power generation region

Claims (5)

A porous support substrate having a gas flow path;
A first power generation element unit that has a fuel electrode current collector, a fuel electrode active unit, an electrolyte, an air electrode active unit, and an air electrode current collector, and is supported on the support substrate;
A dense layer having no oxygen ion conductivity;
With
The fuel cell includes a power generation region in which the fuel electrode active portion, the electrolyte, and the air electrode active portion overlap, and a non-power generation region that is another region,
The air electrode current collector extends from the power generation region to a non-power generation region,
The dense layer is disposed between the air electrode current collector and the support substrate in the non-power generation region.
Fuel cell.
A reaction-preventing film that is disposed between the electrolyte and the air electrode active portion and is made of a material containing ceria containing a rare earth element;
The fuel battery cell according to claim 1.
The air electrode current collector has the same main component as the support substrate,
The fuel battery cell according to claim 1 or 2.
The dense layer is disposed so as to cover a pair of side surfaces of the support substrate.
The fuel battery cell according to claim 3.
A second power generation element portion supported on the support substrate, having a fuel electrode current collector, a fuel electrode active portion, an electrolyte, an air electrode active portion, and an air electrode current collector;
An interconnector for electrically connecting the first power generation element portion and the second power generation element portion;
Further comprising
The air current collector part of the first power generation element part extends toward the second power generation element part,
The fuel electrode current collector of the second power generation element portion extends toward the first power generation element portion,
The interconnector electrically connects the air electrode current collector of the first power generating element part and the fuel electrode current collector of the second power generating element part,
The fuel cell according to any one of claims 1 to 4.

Images