JP2005174663A - Single chamber fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single chamber fuel cell in which power generation characteristics are improved. <P>SOLUTION: The single chamber fuel cell 1 is capable of generating electric power by means of a mixture gas with oxidizer gas containing hydrocarbon-based fuel gas and oxygen, and is composed of a perovskite type oxide expressed by a following general formula of an air electrode 5: La<SB>1-x</SB>Sr<SB>x</SB>Co<SB>1-y</SB>Fe<SB>y</SB>O<SB>(3±δ)</SB>. The fuel cell 1 is configured for a support body, a fuel electrode, an electrolyte film, and an air electrode to be laminated in this order, and the support body is preferably composed of a porous body in which a constituting material of the fuel electrode is retracted in a pore of a metal porous body. In the formula, 0.1≤x≤0.9, 0.1≤y≤0.9, and 0≤δ<1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a single-chamber solid electrolyte fuel cell capable of generating electric power using a mixed gas of a hydrocarbon fuel gas and an oxidant gas containing oxygen.

  A fuel cell is a cell that uses, for example, air and hydrogen as an oxidant gas and a fuel gas, respectively, and directly takes out a free energy change when the fuel is oxidized as electric power. In particular, high-temperature solid electrolyte fuel cells that use oxide solid electrolytes such as yttria-stabilized zirconia and operate at a high temperature of 1000 ° C. are attracting attention as large generators because of their high power generation efficiency and effective use of waste heat. .

  However, since these fuel cells are of a two-chamber type that supplies gas to each electrode separately, a separator and a gas seal material are required. In addition, since the operating temperature is as high as about 1000 ° C. and the material constituting the cell is a heat-resistant ceramic material, there are problems in the reliability and long-term durability of the fuel cell. Furthermore, there is a drawback that it takes time to operate and stop the battery, and it has not been able to withstand rapid heating and rapid cooling. Therefore, the high-temperature solid electrolyte fuel cell is not suitable for use as a small-sized cogeneration system for home use or a moving generator such as an auxiliary power source for automobiles and a power source for electric cars.

  On the other hand, development of a solid polymer type fuel cell that uses a solid polymer membrane of a proton conductor as a solid electrolyte and operates at 100 ° C. or less is progressing. However, in order to operate this type of fuel cell at a relatively low temperature, the fuel must be reformed externally and supplied to the fuel cell as hydrogen. In addition, a fuel cell using methanol as a fuel has been proposed, but a large amount of an expensive noble metal catalyst must be used in order to react the fuel at a relatively low temperature.

  In recent years, attention has been focused on single-chamber high-temperature solid electrolyte fuel cells that can generate power using a mixed gas of a hydrocarbon-based fuel gas and an oxidant gas containing oxygen (see Patent Documents 1 and 2). A single-chamber fuel cell does not require a separator or gas seal material that has been required for a two-chamber fuel cell. This is expected to improve the durability. Further, unlike the polymer electrolyte fuel cell, there is an advantage that no reforming of the fuel is necessary and no precious metal catalyst is necessary. However, in a single-chamber fuel cell, a mixed gas is supplied to both the fuel electrode and the air electrode. Therefore, the reaction between the fuel electrode and the fuel gas and the reaction between the air electrode and the oxidant gas are selectively performed. Is not easy. Therefore, it has been difficult to improve the power generation characteristics as compared with the two-chamber fuel cell.

JP 2002-151098 A JP 2002-280017 A

  Accordingly, an object of the present invention is to provide a single-chamber fuel cell that can solve the various problems of the prior art described above.

The present invention relates to a single-chamber fuel cell capable of generating electric power using a mixed gas of a hydrocarbon fuel gas and an oxidant gas containing oxygen.
The object is achieved by providing a single-chamber fuel cell characterized in that the air electrode is made of a perovskite oxide represented by the following general formula (1).
La _1-x Sr _x Co _1-y Fe _y O ₍₃ ± δ ₎ (1)
(In the formula, 0.1 ≦ x ≦ 0.9, 0.1 ≦ y ≦ 0.9, and 0 ≦ δ <1.)

  According to the single-chamber fuel cell of the present invention, the power generation characteristics of the fuel cell are improved. Further, by using a specific support, the strength and thermal shock resistance of the fuel cell are also improved.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 shows a schematic diagram of an embodiment of a single-chamber fuel cell of the present invention. The fuel cell 1 according to this embodiment includes a support 2, a fuel electrode 3, an electrolyte membrane 4, and an air electrode 5 stacked in this order. The fuel cell 1 is capable of generating electric power using a mixed gas of a hydrocarbon fuel gas and an oxidant gas containing oxygen. The mixed gas is supplied to both the fuel electrode and the air electrode.

The present invention is characterized by using a specific perovskite oxide as the air electrode 5. As the specific perovskite oxide, those represented by the following general formula (1) are used. As will be apparent from the examples described later, this substance is used in the oxidation reaction of fuel gas as compared with substances conventionally used as the air electrode of a single-chamber fuel cell, such as LaSrMnO ₃ , LaSrCoO ₃ , SmSrMnO _3, etc. It is more inert and more active in the reduction reaction of oxygen molecules adsorbed on the air electrode. As a result, the power generation efficiency of the fuel cell 1 of the present embodiment is greatly improved as compared with the conventional single-chamber fuel cell.
La _1-x Sr _x Co _1-y Fe _y O ₍₃ ± δ ₎ (1)
(Where 0.1 ≦ x ≦ 0.9 and 0.1 ≦ y ≦ 0.9. Also, δ is the stoichiometric ratio of La, Sr, Co, and Fe and O in the general formula (1). Represents the number to match, and 0 ≦ δ <1.)

As a result of the study by the present inventors, it has been found that the substance represented by the general formula (1) is a mixed conductor having both ionic conductivity and electronic conductivity. The electrode reaction in the fuel cell 1 is considered to occur near the three-phase interface where the three phases of the reaction gas, the solid electrolyte (ion conductor), and the electrode material (electronic conductor) are in contact. The ionization reaction of oxygen at the air electrode 5 proceeds according to (1/2) O ² + 2e ⁻ → O ²⁻ . This reaction generally proceeds at the above three-phase interface, but it has been found that the above mixed conductor also proceeds on the surface. As a result, the mixed conductor has the advantage that the effective area is remarkably increased and no polarization occurs up to a high current density.

In particular, when x in the general formula (1) is 0.2 ≦ x ≦ 0.8 and y is 0.2 ≦ y ≦ 0.8, the ion conductivity is extremely high. For example, when x = 0.8 and y = 0.2, the ionic conductivity at 800 ° C. is 1.1 Scm ⁻² , which is a value of zirconium oxide or cerium oxide well known as an ionic conductor. It is several tens to several hundred times the ionic conductivity. As a result, oxygen ions ionized on the surface can move through the crystal at a sufficiently high speed. Therefore, the substance represented by the general formula (1) is extremely suitable as a highly efficient oxygen electrode material.

The substance represented by the general formula (1) can be obtained by mixing and firing each powder of La ₂ O ₃ , SrCoO ₃ , CoO and FeO. The amount of each powder is such that the amounts of La, Sr, Co, and Fe in the finally obtained substance have a composition represented by the general formula (1).

  The thickness of the air electrode 5 is not critical in the present invention, but is preferably 5 to 300 μm, particularly preferably 10 to 100 μm.

  The support 2 in the fuel cell 1 has a metal porous body. The support 2 has a role of increasing the strength of the fuel cell 1. The support 2 also acts as a current collector. The constituent material of the fuel electrode 3 enters the pores of the metal porous body. That is, the support 2 is a composite of the metal porous body and the constituent material of the fuel electrode 3, that is, a composite porous body. By using such a composite porous body as the support 2, the strength and thermal shock resistance of the fuel cell 1 can be improved as compared with the case where the metal porous body is used alone.

  The metal porous body preferably has a catalytic activity for hydrocarbon gases. The metal porous body preferably has heat resistance. From these viewpoints, it is preferable to use nickel, nickel alloy, hastelloy or stainless steel as the metal porous body. By using a porous metal body made of these materials, the strength and thermal shock resistance of the fuel cell 1 can be improved while improving the power generation characteristics.

  The porosity of the metal porous body is preferably 20 to 97% by volume, particularly 50 to 80% by volume, from the viewpoint of improving the strength and thermal shock resistance of the fuel cell 1 and improving the power generation characteristics. For the same reason, the metal porous body preferably has a thickness of several tens of μm to several mm. In addition, by setting the thickness of the metal porous body to this level, an electrolyte membrane described later can be thinned, and the internal resistance of the fuel cell 1 can be reduced. Reduction of internal resistance is extremely advantageous from the viewpoint of increasing the efficiency of the fuel cell 1.

  The pores of the metal porous body are preferably communication holes (open cells) from the viewpoint of good flow of fuel gas. For the same reason, the pore diameter is preferably 10 μm to several hundred μm.

  From the viewpoint of further increasing the strength and thermal shock resistance of the fuel cell 1 and further improving the power generation characteristics, the support 2 made of a composite porous body is made of a metal porous material in the form of a paste, for example, in the form of paste. It is preferably formed by filling a material. From the viewpoint of effective compounding, the constituent material powder of the fuel electrode 3 is preferably applied to the metal porous body in a paste state, for example. Furthermore, it is preferable that the support 2 is obtained by compressing and deforming a metal porous body by pressing or rolling after filling the powder of the constituent material of the fuel electrode 3. It is effective that the degree of compression of the metal porous body by pressing or roll processing is 10 to 90%, particularly 30 to 70% of the thickness before compression.

  The metal porous body may carry Cu, Zn, Ru, Pt, Rh, etc., which are catalytically active substances for hydrocarbon gases.

As the fuel electrode 3 in the fuel cell 1, materials conventionally used for this type of fuel cell can be used without particular limitation. For example, a mixture of nickel and Ce _0.8 Gd _0.2 O _1.9 can be used. A particularly preferred material is a mixture of nickel or nickel oxide and cerium oxide doped with a rare earth oxide. In this material, it is considered that the electrode reaction is promoted by mixed conduction of ion conduction and electron conduction by cerium oxide and electron conduction of nickel (or nickel oxide reduced). In particular, in the fuel cell 1 shown in FIG. 1, the constituent material of the fuel electrode 3 enters the pores of the metal porous body that has a catalytic activity for the hydrocarbon-based gas, thereby forming a composite porous body. The electrode reaction at the fuel electrode 3 is further promoted. The thickness of the fuel electrode 3 is not critical in the present invention, but is preferably 5 to 300 μm, particularly preferably 10 to 100 μm.

  As the electrolyte membrane 4 in the fuel cell 1, materials that have been conventionally used in this type of fuel cell can be used without particular limitation. Examples thereof include cerium oxide and zirconium oxide doped with rare earth oxides such as samarium. In particular, cerium oxide doped with samarium oxide or gadolinium oxide has high ionic conductivity even at a relatively low temperature, and is suitable as a solid electrolyte. The thickness of the electrolyte membrane 4 is not critical in the present invention, but is preferably 5 to 300 μm, particularly 10 to 100 μm from the viewpoint of reducing internal resistance.

  Next, a preferred method for manufacturing the fuel cell 1 shown in FIG. 1 will be described. First, the support 2 made of the composite porous body described above is manufactured. The support 2 is coated with a paste containing a powder of the constituent material of the fuel electrode 3 (hereinafter, this paste is referred to as a composite paste) on the metal porous body and filled in the pores of the metal porous body. It can be obtained by compressing and deforming the metal porous body by pressing or rolling.

  The composite paste is made of, for example, a mixture of the constituent material powder of the fuel electrode 3 and various binders. As the binder, for example, polyvinyl alcohol, polyvinyl butyral, methyl cellulose, polyethylene, acrylic resin, gum arabic, terpineol, polyethylene glycol and the like are used. These binders are also included in various pastes described later.

  It is preferable that a pore forming agent is contained in the composite paste. This is because it is advantageous from the viewpoint of ensuring gas flowability that the composite porous body is a porous body that allows gas to permeate. As the pore forming agent, carbon powder or the like can be used.

  The composite paste can be applied by using, for example, a dip coating method, a spray coating method, a doctor blade method, a tape casting method, screen printing, or the like (the same applies to various pastes described later).

  Next, a powder paste of the constituent material of the fuel electrode (hereinafter, this paste is referred to as a fuel electrode paste) is applied to the surface of the metal porous body on which the composite paste is applied and dried. This coating film becomes the fuel electrode 3 by sintering described later. It is possible to directly apply the fuel electrode paste to the metal porous body, fill the pores of the metal porous body, and form the fuel electrode coating film on the surface of the metal porous body. When the pores of the metal porous body are large, the fuel electrode paste tends to excessively enter the pores, and as a result, it becomes difficult to smooth the surface of the coating film for the fuel electrode. Therefore, in this embodiment, a two-step operation is performed in which the composite paste is first applied and then the fuel electrode paste is applied. By performing this operation, the surface of the coating film for the fuel electrode becomes smooth.

  On the coating film for the fuel electrode, a paste containing powder of the constituent material of the electrolyte membrane 4 (hereinafter, this paste is referred to as an electrolyte paste) is applied and dried. As a result, a coating film for the electrolyte is formed. This coating film becomes the electrolyte film 4 by sintering described later. On this coating film, a paste containing powder of the constituent material of the air electrode 5 (hereinafter, this paste is referred to as an air electrode paste) is applied and dried. Thereby, a coating film for the air electrode is formed. This coating film becomes the air electrode 5 by sintering described later. Thereafter, the fuel electrode 3, the electrolyte membrane 4, and the air electrode 4 are formed by integrally sintering the whole, and the fuel cell 1 is obtained. The sintering temperature is about 1100 ° C to 1400 ° C. In order to prevent deterioration of the metal porous body due to oxidation, the sintering is preferably performed in an inert gas atmosphere such as a nitrogen atmosphere.

  As another method of manufacturing the fuel cell 1 of the present embodiment, the following method can also be employed. First, a raw sheet of the electrolyte membrane 4 is obtained by a doctor blade method, a tape casting method, an extrusion method, or the like. Separately, a coating film for the fuel electrode is formed on the support 2 made of a composite porous body. A raw sheet or a sintered raw sheet (hereinafter referred to as a raw sheet or the like) is laminated on a coating film for a fuel electrode. Next, a paste containing powder of the constituent material of the air electrode 5 is applied onto a raw sheet or the like. Finally, the fuel cell 1 is obtained by integrally sintering the whole. Alternatively, a green sheet or the like is laminated on the coating film for the fuel electrode, and then sintered once. After the sintering, a paste containing the powder of the constituent material of the air electrode 5 is applied, and then sintered again. Also good. In any case, instead of forming the coating film for the fuel electrode on the support, it may be formed on a raw sheet or the like. Regarding the air electrode 5, an air electrode coating film may be formed in advance on a raw sheet or the like prior to laminating a raw sheet or the like on a fuel electrode coating film. Also in the case of this method, the sintering is preferably performed in an inert gas atmosphere such as a nitrogen atmosphere.

  The fuel cell 1 of this embodiment is practically used by stacking a plurality of single cells. Stacking includes a stacked stack and a planar stack. FIG. 2 shows a state in which a single cell of the fuel cell 1 is stacked. As shown in FIG. 2, a gap is provided by a spacer 6 between each single cell. The reason for providing the gap is as follows. First, since the single-chamber fuel cell generates power by utilizing the difference in reaction activity (chemical potential) between the fuel gas and the oxidant gas in the fuel electrode and the air electrode, the metal that promotes the activity of the fuel electrode This is because if the porous body is in contact with the air electrode, the chemical potential of the reaction is lowered, which is considered to adversely affect the reaction. Second, in order to sufficiently bring the air electrode into contact with the mixed gas, it is desirable to provide a space for circulating the mixed gas between single cells that are stacked and stacked. The interval between the single cells may be such that the mixed gas can sufficiently flow, and specifically, 0.1 mm to several mm is sufficient. In the case where a single cell is not stacked and stacked, but stacked in a flat plate shape, such an allowance is unnecessary.

  The present invention is not limited to the embodiment. For example, in the above-described embodiment, the support body is a composite porous body of the metal porous body and the constituent material of the fuel electrode. Instead, the metal porous body is combined with the constituent material of the fuel electrode. The fuel electrode may be directly formed on the surface of a support made of only a metal porous body without using a metal porous body. In some cases, the support itself may not be used.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples.

[Example 1]
(1) Preparation of Electrolyte Paste 80 mol% of cerium oxide (average particle diameter of about 1 μm) and 20 mol% of samarium oxide (average particle diameter of about 1 μm) were weighed and mixed with a ball mill for 12 hours. Next, it was calcined at 1250 ° C. for 10 hours. The powder obtained by calcination was pulverized for 2 hours using a ball mill. As a result, a solid electrolyte made of cerium oxide doped with samarium oxide (average particle size of about 0.7 μm) was obtained. To this solid electrolyte, an acrylic resin, polyvinyl butyral, terpineol, and polyethylene glycol were added as a binder, and kneaded for 10 minutes using a vacuum degassing kneader. Thus, an electrolyte paste was obtained.

(2) Preparation of fuel electrode paste To 35 parts by weight of the solid electrolyte obtained in (1), 65 parts by weight of NiO (average particle size of about 1 μm) was added and mixed and pulverized in a bead mill for 2 hours. As a result, a mixture of NiO and cerium oxide doped with samarium oxide was obtained. A binder similar to the binder used in (1) was added to this mixture, and kneaded for 10 minutes using a vacuum degassing kneader. Thus, a fuel electrode paste was obtained.

(3) Preparation of composite paste 10 parts by weight of carbon powder (pore forming agent) was added to 90 parts by weight of the mixture of NiO obtained in (2) and cerium oxide doped with samarium oxide, Mix and grind for hours. Thereafter, a composite paste was obtained in the same manner as in (2).

(4) Preparation of paste for air electrode Each powder of La ₂ O ₃ , SrCoO ₃ , CoO and FeO (average particle diameter of about 1 μm) was mixed for 12 hours by a ball mill. Next, it was calcined at 1250 ° C. for 10 hours. The mixing ratio of each powder was such that the final composition of the powder was La _0.2 Sr _0.8 Co _0.8 Fe _0.2 O _(3- δ ₎ . The powder obtained by calcination was pulverized for 2 hours using a ball mill. As a result, a powder having the above composition was obtained. Thereafter, an air electrode paste was obtained in the same manner as in (1).

(5) Production of composite porous body As a metal porous body, an open cell type nickel porous body having a thickness of 1.6 mm, a porosity of 90% by volume and a pore diameter of 0.5 mm (Celmet (trade name) manufactured by Sumitomo Electric) ) Was used. The composite paste was applied to one surface of the nickel porous body, and the paste was filled in the pores of the nickel porous body. Next, the nickel porous body was pressed to a thickness of 0.5 mm. Thus, a composite porous body was obtained.

(6) Formation of coating film for fuel electrode The fuel electrode paste was applied by screen printing to the surface of the composite porous body on which the composite paste was applied. The thickness of the coating film was about 50 μm. Next, the coated film was dried at 100 ° C. for 2 hours.

(7) Formation of Coating Film for Electrolyte An electrolyte paste was applied on the coating film for the fuel electrode by screen printing. The thickness of the coating film was about 50 μm. Next, the coated film was dried at 100 ° C. for 2 hours.

(8) Formation of coating film for air electrode On the coating film for electrolyte, the paste for air electrodes was applied by screen printing. The thickness of the coating film was about 50 μm. Next, the coated film was dried at 100 ° C. for 2 hours.

(9) Fabrication of fuel cell The entire coating film was baked at 500 ° C. for 1 hour to remove the binder. Subsequently, it was integrally sintered at 1300 ° C. for 4 hours in a nitrogen atmosphere. Thus, the fuel cell shown in FIG. 1 was obtained.

[Example 2]
80 mol% of cerium oxide (average particle diameter of about 1 μm) and 20 mol% of samarium oxide (average particle diameter of about 1.5 μm) were weighed and mixed in a ball mill for 12 hours. Next, it was calcined at 1250 ° C. for 10 hours. The powder obtained by calcination was pulverized for 2 hours using a bead mill. As a result, a solid electrolyte made of cerium oxide doped with samarium oxide (average particle size of about 0.7 μm) was obtained. To 100 parts by weight of this solid electrolyte, 4 parts by weight of methylcellulose, 3 parts by weight of glycerin, 5 parts by weight of lubricant and 12 parts by weight of water were added and kneaded for 30 minutes with a high-speed mixer. The kneaded product was extruded into a sheet using a vacuum extruder and dried at 100 ° C. for 12 hours to obtain a raw sheet. The thickness of the raw sheet was about 0.3 mm. This green sheet was sintered at 1400 ° C. for 4 hours to obtain a solid electrolyte made of cerium oxide doped with samarium oxide.

  Apart from the formation of the solid electrolyte, a nickel porous material similar to that used in Example 1 was prepared, and a screen similar to the composite paste used in Example 1 was applied to one surface of the porous material. The paste was applied by printing and filled in the pores of the nickel porous body. Next, the nickel porous body was pressed to a thickness of 0.5 mm. Thus, a composite porous body was obtained. Next, the same thing as the fuel electrode paste used in Example 1 was applied by screen printing to the surface of the composite porous body on which the composite paste was applied. The thickness of the coating film was about 50 μm. The previously prepared solid electrolyte was placed on the coating film for the fuel electrode, and the whole was dried at 100 ° C. for 2 hours. Thereafter, the whole was sintered at 1350 ° C. for 2 hours. After sintering, the same paste as the air electrode paste used in Example 1 was applied on the solid electrolyte by screen printing. The thickness of the coating film was about 50 μm. The coated film was dried at 100 ° C. for 2 hours, and then the whole was sintered at 1300 ° C. for 4 hours to obtain the fuel cell shown in FIG. Each sintering process was performed in a nitrogen atmosphere.

[Comparative Example 1]
In Example 1, the coating film for the fuel electrode was directly formed on the surface of the nickel porous body without performing the step (5), and in the air electrode paste used in Example 1, La _0.2 Sr _0.8 A fuel cell was obtained in the same manner as in Example 1 except that LaSrMnO ₃ was used instead of Co _0.8 Fe _0.2 O _(3- δ ₎ . The support in this fuel cell was not a composite of the nickel porous body and the constituent material of the fuel electrode.

[Performance evaluation]
About the electrode obtained by the Example and the comparative example, the electric power generation characteristic and the thermal shock resistance were measured with the following method. The results are shown in Table 1 below.

[Power generation characteristics]
Using a mixed gas of methane and oxygen as the fuel gas, the power generation characteristics of the fuel cell were evaluated at 600 ° C. The power generation characteristics are expressed as the maximum output per unit area. The mixed gas was methane 22 vol%, oxygen 22 vol%, and nitrogen 56 vol%, and the flow rate of the mixed gas was 300 ml / min.

[Thermal shock resistance]
A 30 × 30 mm fuel cell was placed in an electric furnace at 600 ° C. and held for 30 minutes, and then taken out from the furnace into the atmosphere at room temperature and examined for cracks.

  As is apparent from the results shown in Table 1, it can be seen that the fuel cell of the example has higher power generation characteristics than the fuel cell of the comparative example.

It is a schematic diagram which shows one Embodiment of the single chamber type fuel cell of this invention. It is a schematic diagram which shows the state which laminated | stacked the single cell of the single chamber type fuel cell shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Single chamber type fuel cell 2 Support body 3 Fuel electrode 4 Electrolyte membrane 5 Air electrode 6 Spacer

Claims (7)

In a single-chamber fuel cell capable of generating electricity with a mixed gas of a hydrocarbon fuel gas and an oxidant gas containing oxygen,
A single-chamber fuel cell, wherein the air electrode is made of a perovskite oxide represented by the following general formula (1).
La _1-x Sr _x Co _1-y Fe _y O ₍₃ ± δ ₎ (1)
(In the formula, 0.1 ≦ x ≦ 0.9, 0.1 ≦ y ≦ 0.9, and 0 ≦ δ <1.) A support, a fuel electrode, an electrolyte membrane, and the air electrode are laminated in this order,
The single-chamber fuel cell according to claim 1, wherein the support is made of a composite porous body in which the constituent material of the fuel electrode enters the pores of the metal porous body.   The single-chamber fuel cell according to claim 2, wherein the fuel electrode is made of nickel or nickel oxide and a mixture of cerium oxide doped with rare earth oxide.   The single-chamber fuel cell according to claim 2 or 3, wherein the metal porous body is made of nickel, nickel alloy, hastelloy, or stainless steel.   The solid oxide fuel cell according to any one of claims 1 to 4, wherein the support is formed by filling a powder of a constituent material of the fuel electrode into pores of the metal porous body by coating.   2. The support body is formed by filling a powder of a constituent material of the fuel electrode into pores of the metal porous body and then compressing or deforming the metal porous body by pressing or rolling. The single-chamber fuel cell in any one of 2-5. The single-chamber fuel cell according to any one of claims 1 to 6, wherein a plurality of single cells of the single-chamber fuel cell are stacked and stacked, and a gap is provided between the single cells.

Images