JP5528174B2 - Current collector for solid oxide fuel cell and cell for solid oxide fuel cell using the same - Google Patents

Description

  The present invention relates to a solid oxide fuel cell using ammonia gas as a fuel (hereinafter also referred to as SOFC), and more specifically, a fuel electrode is formed on one side of a solid electrolyte and an air electrode is formed on the other side. In SOFC, it is related with the fuel electrode current collector installed in the fuel electrode side, and the cell for solid oxide fuel cells which has the said fuel electrode current collector.

  Conventionally, hydrogen and natural gas steam reformed gas are commonly used as SOFC fuels, but in addition to these, hydrocarbon gases such as methane gas and methane hydrate; alcohol; coke oven gas and coal Coal gas such as dry-distilled gas (COG) and coal gasification gas; biogas obtained by fermentation of human waste and garbage; gasoline; kerosene; and the like can be used as fuel. However, these fuels have a problem of depositing carbon, which is one of the decomposition products, on the fuel electrode and impurity components contained in the fuel (sulfur compounds such as odorants, chlorine, Si compounds, alkali metals) Etc.) is a problem of poisoning of the electrode electrode catalyst. Moreover, since it is discharged as carbon dioxide after the power generation reaction, it is not always sufficient as an environmental energy technology for realizing a low-carbon society.

  Therefore, a non-hydrocarbon SOFC that does not discharge carbon dioxide and has no carbon deposit or impurity problems and is fueled with ammonia having a high energy density is being studied (for example, Non-Patent Documents 1 and 2). However, most of the research is related to the initial power generation performance, and the research on the unreacted ammonia gas contained in the exhaust gas has not been sufficiently conducted.

  On the other hand, in polymer electrolyte fuel cells (hereinafter referred to as PEFC), various technologies using ammonia fuel have been disclosed and improved. In any case, ammonia is once decomposed into hydrogen, and this hydrogen is used as fuel. It is a technology to supply. For example, in Patent Document 1, hydrogen is generated from a fuel containing ammonia as a main component by a decomposition reaction in an ammonia decomposition reactor, and the generated hydrogen is taken out through a hydrogen separation membrane provided in the decomposition reactor. A technique using a hydrogen supply system for a fuel cell in which purified hydrogen is used as fuel hydrogen for a fuel cell is disclosed. However, as a matter of course, a technique for directly supplying ammonia by PEFC is not disclosed.

Non-Patent Document 1 uses a 100 cm ² electrolyte-supported cell (hereinafter referred to as ESC) and an 81 cm ² fuel-electrode supported cell (hereinafter referred to as ASC) using Ni / 8YSZ as a fuel electrode. In order to determine the decomposition rate of ammonia at 700 to 1000 ° C., the ammonia discharge concentration is measured. According to this, it is about 15 ppm, which is almost the same as the equilibrium composition at 1000 ° C., but increases as the temperature decreases, and is about 80 ppm at 750 ° C. and about 250 ppm at 700 ° C., and efficiently uses fuel ammonia in such a system. It is not a thing. In such a case, if measures are taken to trap and decompose undecomposed ammonia, the SOFC system becomes complicated and the maintenance becomes complicated, which may increase the cost.

JP-A-8-78039

Proceedings of the 6th European SOFC Forum (Vol. 3, P. 1524, 2004) Journal of Power Sources Vol. 118, (2003), p. 342-348

  It is an object of the present invention to provide an ammonia decomposition gas in an SOFC that uses ammonia-containing gas as a fuel without supplying an ammonia decomposition reactor and supplying the fuel directly to the fuel electrode through the anode current collector. Of a fuel electrode current collector for a solid oxide fuel cell capable of reducing the amount of discharge outside the SOFC system as much as possible over a long period of time, and a fuel electrode current collector for a solid oxide fuel cell formed by the fuel electrode current collector material An object of the present invention is to provide a solid oxide fuel cell having the fuel electrode current collector.

  As a result of diligent research to achieve the above-described object, the present inventors have found that a conductive material used in a fuel electrode as a fuel electrode current collector used in a solid oxide fuel cell using an ammonia-containing gas as a fuel. The present invention has been completed by discovering that it is effective to have a material composition containing a metal of the same type as a conductive metal and an ammonia decomposition catalyst.

  That is, in one aspect, the present invention includes, as a material used for a fuel electrode current collector, at least a metal of the same kind as a conductive metal used for a fuel electrode, and an ammonia decomposition catalyst. It is in the anode current collecting material of the fuel cell. At this time, the ammonia decomposition catalyst is at least one selected from the group consisting of metals of Group 6 to Group 10 of the periodic table, in particular, Mo, W, Fe, Ru, Co, Ni, Pd. And at least one selected from the group consisting of Pt metals.

  In another aspect, the present invention is a fuel electrode current collector installed on the fuel electrode side in a solid oxide fuel cell, the fuel electrode current collector formed of the fuel electrode current collecting material. Is in the body. The form is preferably made of a material containing at least the ammonia decomposition catalyst and the same metal as the conductive metal used for the fuel electrode.

  Furthermore, in another aspect, the present invention is a solid oxide fuel cell having the anode current collector of the present invention.

  In addition, the gas containing ammonia used as fuel in the present invention is generated from a high-efficiency anaerobic digester of ammonia gas, liquefied ammonia gas, human waste, raw garbage, etc., or livestock waste such as pig dung and cow dung. In addition to biogas, hydrocarbon gases such as natural gas, methane gas, and methane hydrate; alcohol; coal gas such as coke oven gas, coal dry distillation gas (COG), and coal gasification gas. Biogas generated from high-efficiency anaerobic digesters of fermented pigs and cow dung and other livestock waste such as ammonia gas, liquefied ammonia gas, human waste and raw garbage with a concentration of 30% or more, preferably 50% or more is suitable Used for. In particular, ammonia gas and liquefied ammonia gas are suitable.

  According to the present invention, as will be understood from the following detailed description, the anode current collecting material of the present invention includes a metal of the same type as the conductive metal used in the anode and an ammonia decomposition catalyst. A fuel electrode current collecting material having excellent ammonia decomposability can be obtained without impairing electric performance. As a result, the amount of undecomposed ammonia discharged out of the system of the solid oxide fuel cell using the gas containing ammonia as fuel is extremely small, preferably the ammonia emission concentration is 5 ppm or less, which is a problem for health and environment. Will be almost the same, and the power generation performance will be comparable to that which does not contain an ammonia decomposition catalyst.

  Further, a solid oxide fuel cell using a cell having a fuel electrode current collector of the present invention includes an ammonia decomposition reactor, a recovery system using an ammonia trap for suppressing discharge of undecomposed ammonia, and undecomposed ammonia. A piping system or the like for recycling the gas containing gas is no longer necessary, and a high-power fuel cell can be provided despite its small size and compactness.

  The anode current collecting material for a solid oxide fuel cell according to the present invention is advantageously used for forming an anode current collector in various types of solid oxide fuel cell cells using a gas containing ammonia as a fuel. be able to. Typically, a flat plate cell, a cylindrical cell, a segmented cell, or the like. The flat plate cell can be divided into an electrolyte support cell (ESC), a fuel electrode support cell (ASC), and an air electrode support cell (CSC). The cylindrical cell can be divided into a cylindrical vertical striped cell and a cylindrical horizontal striped cell, and can further include a cylindrical flat plate cell. In short, in the practice of the present invention, the SOFC can have a variety of structures including those known in publications and those currently implemented.

  The solid oxide fuel cell of the present invention basically has a solid electrolyte, a fuel electrode formed on one side of the electrolyte, and the other side of the electrolyte, as in the case of conventional general fuel cells. And can be arbitrarily modified and improved within the scope of the present invention. As described in detail below, the fuel electrode assembly of the present invention It is important to install a fuel electrode current collector made of an electric material.

In the practice of the present invention, the solid electrolyte of the solid oxide fuel cell can be formed in various forms. The electrolyte is typically in the form of a flat plate or in the form of a film, thin film, coating, or the like. The material of the solid electrolyte is not particularly limited, and includes, for example, the following known materials.
(A) YSZ (yttria-stabilized zirconia), ScSZ (scandia-stabilized zirconia), zirconia-based powders obtained by further doping Ce, Al, etc. into these zirconia (b) SDC (samaria-doped ceria), GDC (gadria-doped) Doseria) and other doped ceria-based powders (c) LSGM (lanthanum gallate) -based powders such as La _0.9 Sr _0.1 Ga _0.8 Mg _0.2 O ₃
(D) Bismuth oxide based powder, for example Bi ₂ O ₃
The thickness of the solid electrolyte is generally in the range of 5 to 500 μm. In the case of an ESC that itself has a supporting function for the fuel electrode and the air electrode, the thickness is 50 to 500 μm, preferably 100 to 400 μm. In the case of ASC in which the solid electrolyte is supported by the electrode, the thickness is 5 to 100 μm, preferably 10 to 50 μm.

  The solid electrolyte can be formed using any technique conventionally used to form sheets, thin films, films, etc., such as a green sheet process. For example, the solid electrolyte material paste is applied in a predetermined pattern, dried to form a green sheet, and then the green sheet is fired at a high temperature, whereby the sheet-like solid electrolyte can be easily formed. For the application of the paste, for example, a printing method such as a screen printing method can be advantageously used. Specifically, for example, a solid electrolyte material paste can be printed in a predetermined pattern on one surface of a flat temporary support, dried, and fired to form a membrane-shaped solid electrolyte. Although the firing temperature can be changed within a wide range depending on the characteristics of the solid electrolyte material used, it is usually in the range of about 1200 to 1500 ° C.

The air electrode is not particularly limited in the practice of the present invention, and can be formed from an air electrode material commonly used in fuel cells. As an appropriate air electrode forming material, an oxide having a manganese-based, ferrite-based, cobalt-based, or nickel-based perovskite structure is preferable. For example, a lanthanum strontium manga doped with a group 2 element of the periodic table such as strontium (Sr) Night _{(La X Sr 1-X MnO} 3), run strontium cobaltite _{(La X Sr 1-X CoO} 3), run strontium cobalt ferrite _{(La X Sr 1-X Co} Y Fe 1-Y O 3), lanthanum nickel such as ferrite _{(LaNi Y Fe 1-Y O} 3) may be mentioned.

  In addition, zirconia powder ceramics such as YSZ, ScSZ, and ScCeSZ, and doped ceria powders such as SDC and GDC may be mixed with the oxide.

  The air electrode is formed so porous that air or oxygen can be sufficiently diffused therein and sufficient electric conductivity can be maintained. Although the porosity of the air electrode can be changed in various ways, it is usually preferably about 10 to 60%. When the solid electrolyte is formed relatively thin, a configuration in which the air electrode is supported by a support such as a conductive mesh may be employed. When the air electrode is supported by the conductive mesh, the thermal shock resistance can be improved and the occurrence of cracks due to a rapid temperature change can be prevented.

  The thickness of the air electrode can be changed in various ways, but is usually about 20 to 200 μm, preferably about 30 to 120 μm. If the air electrode is too thin, the original function of the air electrode cannot be obtained, and problems such as a decrease in output are caused as a result of insufficient air electrode reaction.

  The air electrode can be formed using any technique conventionally used for forming thin films, films, and the like. For example, the air electrode can be easily formed by applying an air electrode forming paste in a predetermined pattern on the surface of a solid electrolyte that has already been formed, and baking it after drying. For the application of the paste, for example, a printing method such as a screen printing method can be advantageously used. Although the firing temperature can be changed within a wide range depending on the characteristics of the air electrode forming material used, it is usually in the range of about 900 to 1500 ° C. Of course, if necessary, the air electrode may be formed using other methods.

  The cell for a solid oxide fuel cell of the present invention has a fuel electrode current collector formed of a specific fuel electrode current collecting material. The fuel electrode material includes at least an ammonia decomposition catalyst and a metal element similar to the conductive metal used for the fuel electrode.

  Here, the conductive metal used for the fuel electrode refers to a conductive metal contained in the fuel electrode in which the fuel electrode current collector is installed.

  The conductive metal is not particularly limited in the practice of the present invention, and a conductive metal generally used in fuel cells can be used. Specifically, metals such as Ni, Co, Pt, Pd, and Ru, or alloys thereof are selected. In the present invention, since the SOFC system is specified by the state of the fuel electrode in a steady operation state, even the oxide of the metal is exposed to a reducing atmosphere and becomes the metal. What is included shall be included as a conductive metal.

  Next, the ammonia decomposition catalyst in the anode current collecting material of the present invention is a catalyst that promotes the decomposition of ammonia in the fuel gas containing ammonia into hydrogen and nitrogen. The catalyst component is at least one selected from the group consisting of metals of Group 6 to Group 10 elements of the periodic table, specifically, Mo, W, Re, Fe, Ru, Co, Rh, It is at least one selected from the group consisting of Ir, Ni, Pd, Pt, etc., and may be an alloy thereof. In particular, a metal selected from the group of W, Fe, Ru, Co, Ni, Pd and Pt is preferable. In the present invention, as in the case of the conductive metal, in the case of the ammonia decomposition catalyst, the anode current collector is reduced to the metal even when the metal oxide is exposed to a reducing atmosphere. Are included as ammonia decomposition catalysts.

  These metals having ammonia decomposing activity are preferably dispersed in a mixture with the conductive metal.

In addition, the ammonia decomposition catalyst in the anode current collecting material of the present invention has an adsorption capacity for ammonia of about 0.000 when expressed by the formula: number of adsorbed molecules (mol) / unit area of the ammonia decomposition catalyst (m ² ). It preferably exhibits an adsorption capacity of 1 × 10 ⁻⁶ mol / m ² to 10 × 10 ⁻⁶ mol / m ² . When the adsorption capacity of the ammonia decomposition catalyst is less than 0.1 × 10 ⁻⁶ mol / m ² , ammonia is not decomposed into hydrogen but remains undecomposed, and the concentration of ammonia discharged outside the fuel cell system also increases. On the contrary, if it exceeds 10 × 10 ⁻⁶ mol / m ² , it is difficult for the reactant to desorb from the ammonia decomposition catalyst, and as a result, the electrode reaction becomes inactive.

  The metal used as the ammonia decomposing catalyst has a particle diameter in the range of 0.01 to 5 μm, preferably excellent in ammonia decomposing activity, and particularly preferably 0.05 to 3 μm. If the particle diameter is less than 0.01 μm, agglomeration occurs in a short period of time, resulting in large particles and a problem that ammonia decomposition activity is greatly reduced. Conversely, if the particle diameter exceeds 5 μm, aggregation is less likely to occur but the ammonia decomposition activity is reduced. Is low, ammonia is increased without being decomposed into hydrogen, and the concentration of ammonia discharged outside the SOFC system is increased.

  Next, the fuel electrode current collector of the present invention will be described.

  The anode current collector including the anode current collecting material described above includes (1) gas diffusibility, (2) consistency of thermal expansion behavior, (3) electron conductivity, (4) chemical / thermal Properties such as mechanical stability are required. Among these viewpoints, in order to match the consistency of thermal expansion behavior as much as possible to the fuel electrode, the fuel electrode current collector material includes a conductive metal contained in the fuel electrode in which the fuel electrode current collector is installed. It is preferable that the same metal is included.

  Although the thickness of the anode current collector can be changed in various ways, it is usually about 10 to 100 μm, preferably about 20 to 50 μm. If the current collector is too thin, the gap between the fuel electrode and the separator cannot be filled. If the current collector is too thick, the loss due to the resistance of the anode current collector itself increases.

  Further, the fuel electrode current collector of the present invention is formed to be porous to such an extent that molecules serving as fuel can be sufficiently diffused therein and sufficient electric conductivity can be maintained. Although the porosity of the anode current collector can be changed in various ways, it is usually preferably in the range of about 10 to 70%, more preferably in the range of 20 to 60%.

  In the case of using ammonia-containing gas as fuel, in order to reduce undecomposed ammonia as much as possible, in the present invention, the anode current collector is formed from an anode current collecting material containing an ammonia decomposition catalyst. However, as a preferable form of the ammonia decomposition catalyst in the fuel electrode current collector, it is preferable that the same kind of metal as the conductive metal used in the fuel electrode and the ammonia decomposition catalyst are uniformly dispersed. .

  Since the ammonia decomposition catalyst is dispersed in the anode current collector, stable ammonia decomposition activity is exhibited while maintaining the power generation performance even if the gas containing ammonia is continuously supplied as the fuel. As a result, the amount of undecomposed ammonia discharged out of the system is reduced.

  The fuel electrode current collector is obtained by forming the current collecting material on the fuel electrode side by printing or coating. Alternatively, the current collecting material may be formed on the fuel electrode side and then sintered. In addition, the fuel electrode current collector can be formed in various modes. For example, the fuel electrode current collector can be formed on the fuel electrode in a regular pattern. As an example, since the fuel electrode is exposed by forming a pattern in a lattice pattern, the gas diffusibility can be further improved. Further, a sheet-like current collecting material may be used and installed on the fuel electrode without printing or coating.

  When the current collecting material is formed on the fuel electrode side by printing or coating, in addition to the conductive metal powder or the corresponding conductive metal oxide and the ammonia decomposition catalyst powder, a binder is further included. May be. By using a binder to form a slurry, the fluidity or plasticity of the current collecting material is improved. Therefore, it becomes easier to fill a gap generated between the fuel electrode and the separator, and the contact resistance can be further reduced. Further, it is difficult to drop off after the current collecting material is attached to the surface of the single cell. The binder disappears when the SOFC is heated for the first time.

  Specific examples of the binder include polyethylene glycol, polyvinyl butyral, polyethylene, polymethyl methacrylate, thinner, polyvinyl alcohol, and methyl cellulose. These may be contained alone or in combination of two or more.

  The current collecting material is obtained, for example, by mixing a conductive metal powder or an oxide of the corresponding conductive metal, which is weighed to a desired ratio, and an ammonia decomposition catalyst powder by an appropriate mixing method. Can do. The said mixing method is not specifically limited, Various mixing methods, such as a ball mill, a sand mill, a vibration mill, a bead mill, can be illustrated. Further, the mixing may be performed in a dry manner, or may be performed in a wet manner by adding an appropriate solvent such as water or alcohol.

  When using a binder, the conductive metal powder or the oxide powder of the corresponding conductive metal and the ammonia decomposition catalyst powder are mixed in advance to prepare a mixed powder, and ultrasonic waves are applied to the binder. And then disperse. In addition, the conductive metal powder or the corresponding conductive metal oxide powder and the ammonia decomposition catalyst powder and the binder are kneaded together, or the conductive metal powder or the corresponding conductive metal oxide powder and the ammonia decomposition catalyst. One of the powders and the binder may be kneaded, the other remaining powder may be added, and further kneaded. In addition to the binder, various solvents such as organic solvents and water, dispersants, and the like can be used in combination as appropriate in the above preparation.

  In the ammonia decomposition catalyst, the amount (metal conversion) of at least one ammonia decomposition catalyst selected from the group consisting of metals of elements of Groups 6 to 10 of the periodic table is contained in the ammonia decomposition catalyst and the fuel electrode. 5 to 95% by mass, preferably 10 to 80% by mass, and more preferably 20 to 70% by mass with respect to the total amount of the conductive metal and the same kind of metal.

  The solid oxide fuel cell according to the present invention is excellent in power generation efficiency even when a gas containing ammonia is used as a fuel, can have a long life and cost, and has an extremely low ammonia emission amount. Can be advantageously produced in various fields. For example, the fuel cell of the present invention can be advantageously used in fields such as automobile power generation, commercial power generation, and household power generation. Further, by downsizing, for example, it can be advantageously used for driving LEDs, LCD displays, portable radios, portable information devices, and the like.

  Hereinafter, the present invention will be described in detail with reference to examples and comparative examples, but the present invention is not limited to the following examples unless it is contrary to the gist of the present invention.

Example 1
(Fuel electrode material)
Commercially available nickel oxide powder (manufactured by Shodo Chemical Co., Ltd .: product name: Green, average particle size: 0.7 μm, specific surface area: 3.5 m ² / g) as 55% by mass and as electrolyte particles, commercially available 10 mol% Scandia 1 mol% stabilized zirconia particles (Daiichi Rare Element Chemical Co., Ltd .; product name: 10Sc1CeSZ, average particle size: 0.6 μm, specific surface area: 10.8 m ² / g) A fuel electrode material was prepared.

(Material for air electrode)
Lanthanum strontium cobalt ferrite powder La _0.6 Sr _0.4 Co _0.2 Fe _0.8 O ₃ (average particle diameter: 0) synthesized by a solid phase method from commercially available lanthanum oxide, strontium carbonate, cobalt oxide and iron oxide powder 0.7 μm, specific surface area: 3.5 m ² / g) and 30% by mass samarium-doped ceria synthesized by a solid phase method from commercially available samarium oxide and ceria powder (average particle size: 1.9 μm, specific surface area) : 2.4 m ² / g) 20% by mass was stirred and mixed to obtain an air electrode material.

(Fuel electrode current collector material)
Commercially available metal ruthenium powder (manufactured by Furuya Chemical Co., Ltd.) was used as the ammonia decomposition catalyst, and commercially available metal nickel powder (manufactured by Ihara Giken Co., Ltd.) was used as the conductive metal material. 20 mass% of ruthenium powder and 80 mass% of metallic nickel powder are mixed by stirring to form a mixture, and 7 parts by mass of polyethylene glycol is added to 100 parts by mass of the mixture. Was prepared.

(Manufacture of cell with anode current collector)
A 10 mol% scandia 1 mol% stabilized zirconia sheet (diameter: 120 mm, thickness 300 μm) prepared and fired using a doctor blade method was used as the electrolyte. On one side of this electrolyte, a fuel electrode paste prepared by adding a binder (diethylene glycol monobutyl ether acetate, n-paraffin, turpentine oil, cellulose resin) to the above fuel electrode material and kneading was applied by screen printing. After drying, it was formed by baking at 1300 ° C. for 2 hours. The fuel electrode had a thickness of 40 μm and a porosity of 35%.

Next, an air electrode paste is prepared in the same manner using the air electrode material and the binder on the other surface of the electrolyte. An air electrode was formed in the same manner as the fuel electrode except that it was fired at 950 ° C., and a cell for a solid oxide fuel cell having an electrode effective area of 95 cm ² was produced. Next, a cell with a fuel electrode current collector is formed by applying the above-described fuel electrode current collector material paste on the surface of the fuel electrode using a screen printing method to form a fuel electrode current collector having a thickness of about 25 μm. Was made.

(Comparative Example 1)
In the anode current collecting material of Example 1, the anode current collecting material was exactly the same as in Example 1 except that the metal ruthenium powder as an ammonia decomposition catalyst was not added and only the nickel metal powder was used as the anode electrode material. A cell with a body was prepared.

(Power generation test and measurement of ammonia in exhaust gas)
Using the cell with the anode current collector obtained in Example 1 and Comparative Example 1, a power generation test was performed at 800 ° C. That is, after a platinum mesh (80 mesh) is installed on the air electrode side of the cell, the cell is sandwiched from both sides of the air electrode and the fuel electrode by two metal manifolds, and the cylinder ammonia (flow rate 1 L / min) is used as the fuel gas. ), And air (flow rate 1 L / min) was supplied as the oxidant gas.

In the measurement, a model number “TR6845” manufactured by Advantest Co., Ltd. is used as a current measuring instrument, and a model number “GP016-20R” manufactured by Takasago Seisakusho Co., Ltd. is used as a current voltage generator. A test was conducted, and the cell area resistance (ASR) when the current density was 0.5 A / cm ² was calculated every 200 hours.

In addition, a part of the fuel electrode exhaust gas was collected by a gas sampler every 200 hours after steady operation, and the ammonia content in the exhaust gas was measured by gas chromatography.
The results are shown in the table.

表１からも明らかな様に、燃料極集電体にアンモニア分解触媒を含む実施例１のセルでは、燃料極排ガス中のアンモニア含有量は３０ｐｐｍ以下であるが、アンモニア分解触媒を含まない比較例１のセルでは、アンモニア含有量は４００ｐｐｍ以上であり、アンモニア分解触媒の効果が明確に表れている。また、発電試験では、アンモニア分解触媒を含む実施例１と比較例１とでは、面積抵抗値およびその経時変化にほとんど差は無く、アンモニア分解触媒を燃料極集電体に含むことによっても、その発電性能を損なっていないことが判る。

As is apparent from Table 1, in the cell of Example 1 in which the anode current collector contains an ammonia decomposition catalyst, the ammonia content in the anode electrode exhaust gas is 30 ppm or less, but the comparative example does not contain the ammonia decomposition catalyst. In the cell 1, the ammonia content is 400 ppm or more, and the effect of the ammonia decomposition catalyst is clearly shown. In addition, in the power generation test, there is almost no difference in the area resistance value and its change with time between Example 1 including the ammonia decomposition catalyst and Comparative Example 1, and by including the ammonia decomposition catalyst in the anode current collector, It can be seen that the power generation performance is not impaired.

  The present invention relates to new power generation and can be developed in the field of new energy.

Claims (5)

A current collecting material for forming a fuel electrode current collector installed on a fuel electrode side of a solid oxide fuel cell using a gas containing ammonia as a fuel, comprising at least an ammonia decomposition catalyst and the fuel electrode to look containing a metal of the conductive metal of the same kind are, the ammonia decomposition catalyst is at least one selected from the group consisting of periodic table group 6 to 10 group element of the metal, of the fuel electrode The same type of metal as the conductive metal is at least one metal selected from the group consisting of Fe, Co, Ni, and Cu (however, the conductive material constituting the ammonia decomposition catalyst and the fuel electrode) And the same kind of metal is the same metal element.) A fuel electrode current collector material for a solid oxide fuel cell. The anode current collecting material according to claim 1 , wherein the ammonia decomposition catalyst is at least one selected from the group consisting of metals of Mo, W, Fe, Ru, Co, Ni, Pd and Pt. A fuel electrode current collector formed on a fuel electrode side of a solid electrolyte in a solid oxide fuel cell, wherein the current collector is formed of the fuel electrode current collector material according to claim 1 or 2. An anode current collector for a solid oxide fuel cell. 4. The anode current collector for a solid oxide fuel cell according to claim 3 , wherein the ammonia decomposition catalyst is uniformly dispersed in the anode current collector. In a solid oxide fuel cell using a gas containing ammonia in which a fuel electrode is formed on one side of a solid electrolyte and an air electrode is formed on the other side, a fuel electrode current collector is provided on the fuel electrode side. A cell for a solid oxide fuel cell with a current collector, wherein the fuel electrode current collector is a current collector according to claim 3 or 4 .