JP2008288145A - Fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve power generation performance of a fuel cell, by increasing the area of a reaction part of an electrode catalyst for an alkaline fuel cell. <P>SOLUTION: The electrode catalyst for the alkaline fuel cell is arranged, to be equipped with a metal porous body having a plurality of pores, and catalyst particles carried on the surface and in the pore of this metal porous body. In the alkaline fuel cell, this electrode catalyst is used as the electrode. That is, the alkaline fuel cell is equipped with an electrolyte membrane, having a function that permeates anions, and a pair of electrodes arranged on its both sides, in which one of the pair of the electrodes or both electrodes out of the pair of electrodes are made the electrode catalyst. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrode catalyst for an alkaline fuel cell, a fuel cell using the same, and a method for forming an electrode catalyst for an alkaline fuel cell.

  Conventionally, for example, Japanese Patent Application Laid-Open No. 2004-288378 discloses a fuel cell using hydrazine as a fuel as one of alkaline fuel cells. Specifically, the above-described conventional fuel cell includes an electrolytic solution that is a potassium hydroxide aqueous solution in which hydrazine is dissolved, a fuel electrode, and an air electrode. The air electrode is formed in a planar shape, and one surface is disposed on the air inlet side and is in contact with air, and is configured to contact the electrolyte on the opposite surface. On the other hand, the fuel electrode is formed in a flat plate shape and immersed in the electrolytic solution. In addition, as the fuel electrode, a fuel electrode is used in which a hydrogen storage alloy film is formed by sputtering or the like on the surface of a current collector made of foamed metal such as foamed Ni or the like formed into a plate shape or a sphere shape.

  By the way, in a fuel cell using hydrazine as a fuel, a fuel electrode that effectively draws out the high energy of hydrazine is required. Specifically, at the fuel electrode in the hydrazine fuel cell, it is necessary to decompose hydrazine supplied as fuel to generate nitrogen gas, hydrogen ions, and electrons. For this reason, the fuel electrode of the hydrazine fuel cell as in the above prior art is required to have a high hydrazine decomposition activity, a large reaction area of the catalyst, a low electric resistance, and an electrode that does not collapse.

  In this respect, metals have low electrical resistance, and metals such as Ni have excellent alkali resistance. Therefore, according to the above prior art, the electric resistance of the fuel electrode can be reduced, and an electrode with less corrosion and less collapse can be obtained. Moreover, the foam metal which is a fuel electrode consists of a metal skeleton having a plurality of spaces (pores). Therefore, when the surface area in the pores is included, the surface area of the foam metal as a whole is large, and a wide reaction area as a catalyst is secured. Further, the hydrogen storage alloy has a high decomposition activity for hydrazine, and efficiently oxidizes the supplied hydrazine to generate nitrogen gas and hydrogen ions. Therefore, the decomposition activity of the fuel electrode is enhanced.

JP 2004-288378 A

  By the way, the above prior art relates to a hydrazine type fuel cell, and is configured by immersing a fuel electrode formed in a plate shape or a sphere shape in an electrolytic solution. That is, the electrode reaction part of the prior art is formed by the electrolyte soaking into the current collector plate. Therefore, the reaction area of the fuel electrode depends on the total surface area including the inside of the hole of the foam metal plate or sphere, and a reaction area larger than the total surface area of the foam metal cannot be obtained. Further, it is considered that the hydrogen storage alloy film formed by sputtering, thermal spraying, or the like does not extend into the hole of the foam metal but is formed only on the surface of the foam metal. Therefore, the portion where the catalytic activity is enhanced by the hydrogen storage alloy remains only on the surface not including the inside of the foam metal hole.

  Further, the above-described conventional technology is applied to an alkaline battery configured by hydrazine as a fuel and dipping a current collector plate of a fuel electrode in an electrolytic solution. However, the alkaline fuel cell is not limited to this, for example, by applying a mixture obtained by mixing a carrier made of a plurality of catalyst particles to the electrolyte membrane on both sides of the electrolyte membrane that transmits anions. There is a fuel cell having a configuration as an electrode catalyst. Also in such a fuel cell, development of an electrode catalyst in which the area of the reaction part of the catalyst is further increased is expected.

  Accordingly, an object of the present invention is to provide an electrode catalyst for an alkaline fuel cell and an alkaline fuel cell using the same, which has been improved so that the reaction area can be increased and fuel can be used efficiently in order to solve the above-mentioned problems. In addition, this manufacturing method is provided.

In order to achieve the above object, a first invention is an electrode catalyst for an alkaline fuel cell, and a porous metal body having a plurality of holes,
Catalyst particles carried on the surface and pores of the porous metal body,
It is characterized by providing.

  According to a second aspect, in the first aspect, the metal porous body is made of one or more metals of a metal group consisting of Fe, Co, Ni, Cu, and Ru.

  According to a third invention, in the first or second invention, the catalyst particles are particles made of Fe, Co, and Ni or Ni particles.

A fourth invention is an alkaline fuel cell,
An electrolyte membrane having a function of transmitting anions,
A pair of electrodes disposed on both sides of the electrolyte membrane,
At least one of the pair of electrodes is any one of first to third electrode catalysts.

The fifth invention is a method for producing an electrode catalyst for an alkaline fuel cell,
A metal obtained by dissolving the second metal from an alloy of the first metal, which is a material of the porous metal body, and any second metal of the metal group consisting of Al, Sn, Zn, and Pb using an alkaline solution. Producing porous bodies,
The metal porous body is added to a mixed solution in which an acetate of a third metal serving as catalyst particles is dissolved in an acetic acid solution,
The mixed solution to which the metal porous body is added is vacuum degassed,
The metal porous body is taken out from the mixed solution after the vacuum degassing,
The porous metal body is heated.

According to a sixth invention, in the fifth invention,
The porous metal body is characterized by being made of one or more metals selected from the group consisting of Fe, Co, Ni, Cu and Ru.

  A seventh invention is characterized in that, in the fifth or sixth invention, the third metal is any one or more metals selected from the group consisting of Fe, Co and Ni.

  According to the first invention, an electrode catalyst for an alkaline fuel cell includes a metal porous body having a plurality of pores, and catalyst particles carried on the surface of the metal porous body and in the pores. Thereby, the reaction in each electrode catalyst of the fuel cell can be promoted also in the pores of the metal porous body, and the area of the reaction part of the catalyst can be increased. Therefore, the power generation performance of the fuel cell can be improved.

  According to the second invention, the porous metal body is made of one or more metals in the metal group consisting of Fe, Co, Ni, Cu, and Ru. By using these metals as the catalyst carrier, the electrical resistance of the electrode can be reduced. Moreover, since these metals have high alkali resistance, they are less likely to corrode or collapse when used as electrode catalysts in alkaline fuel cells, and are suitable as electrodes.

  According to the third aspect of the invention, particles made of Fe, Co, and Ni or Ni particles are used as the catalyst particles. These catalysts are suitable as electrode catalysts for alkaline fuel cells because of their high alkali resistance and resistance to corrosion. Further, the cost of the electrode catalyst can be reduced as compared with the case where conventional platinum is used as the catalyst particles. Furthermore, when Fe—Co—Ni particles are used, when a fuel having a CC bond such as alcohol is supplied, the CC bond can be cut, so that it can be used as an electrode having higher catalytic activity. .

  According to the fourth invention, the electrode catalyst is disposed as an electrode on both sides or one surface of the anion exchange membrane. Thereby, it can be set as the alkaline fuel cell which has said effect, and can improve the electric power generation performance of an alkaline fuel cell.

  According to the fifth invention, it is possible to produce an electrode catalyst in which catalyst particles are supported on the surface and inside of a hole of a porous metal body having a plurality of holes. Accordingly, an electrode catalyst having a large reaction area can be obtained.

  According to the sixth invention, the porous metal body is made of one or more metals in the metal group consisting of Fe, Co, Ni, Cu, and Ru. By using these metals as the catalyst carrier, the electrical resistance of the electrode can be reduced. Moreover, since these metals have high alkali resistance, they are less likely to corrode or collapse when used as electrode catalysts in alkaline fuel cells, and are suitable as electrodes.

  According to the seventh aspect of the invention, particles made of Fe, Co and Ni or Ni particles are used as the catalyst particles. Since these catalysts have high alkali resistance and are unlikely to corrode, they are suitable as catalysts for alkaline fuel cells. Further, the cost of the electrode catalyst can be reduced as compared with the case where conventional platinum is used as the catalyst particles. Furthermore, when Fe—Co—Ni particles are used, when a fuel having a CC bond such as alcohol is supplied, the CC bond can be cut, so that it can be used as an electrode having higher catalytic activity. .

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof is simplified or omitted.

Embodiment.
FIG. 1 is a diagram for explaining the configuration of a fuel cell according to an embodiment of the present invention. The fuel cell shown in FIG. 1 is an alkaline fuel cell. The fuel cell has an anion exchange membrane 10 (electrolyte membrane). On both sides of the anion exchange membrane 10, an anode 20 and a cathode 30 are arranged as a pair of electrodes. A current collector plate 40 is disposed on both outer sides of the anode electrode 20 and the cathode electrode 30. A fuel path 50 is connected to one surface side of the current collector plate 40 on the anode electrode 20 side, and a fuel supply source (not shown) is connected to the fuel path 50. Fuel is supplied from the fuel supply source to the anode electrode 20 through the fuel path 50 and the current collector plate 40, and unreacted fuel and the like are discharged from the anode electrode 20. On the other hand, an oxygen path 60 is connected to one surface side of the current collector plate 40 on the cathode electrode 30 side. The atmosphere is supplied to the cathode electrode 30 through the oxygen path 60 and the current collector plate 40, and the atmospheric off gas containing unreacted oxygen is discharged from the cathode electrode 30.

At the time of power generation by the fuel cell, a fuel containing hydrogen such as ethanol is supplied to the anode 20 as a fuel. On the other hand, the cathode 30 is supplied with air (or oxygen). When fuel is supplied to the anode electrode 20, the hydrogen catalyst in the fuel reacts with the hydroxide ions that have passed through the anion exchange membrane 10 by the function of the electrode catalyst of the anode electrode 20, and water is generated. Electrons are emitted. The reaction at the anode electrode 20 is expressed by the following equation (1) when pure hydrogen is supplied as the fuel, and is expressed by the following equation (2) when ethanol is supplied.
H ₂ + 2OH ⁻ → 2H ₂ O + 2e ⁻ (1)
CH ₃ CH ₂ OH + 12OH ⁻ → 2CO ₂ + 9H ₂ O + 12e ⁻ (2)

On the other hand, when the atmosphere is supplied to the cathode 30, oxygen molecules in the atmosphere receive electrons from the electrode through several stages due to the function of the electrode catalyst of the cathode 30 to generate hydroxide ions. . The hydroxide ions pass through the anion exchange membrane 10 and move to the anode electrode 10 side. The reaction at the cathode electrode 30 is represented by the following equation (3).
_1/2 O ₂ + H ₂ O + 2e ⁻ → 2OH ⁻ (3)

When the reactions on the anode electrode 20 side and the cathode electrode 30 side as described above are summarized, a water generation reaction occurs as shown in the following formula (4) in the entire fuel cell, and the electrons at this time are collected on the current collector plate 40 on both electrode sides. Will move through.
H ₂ + 1 / 2O ₂ → H ₂ O (4)

In such an alkaline fuel cell, the anion exchange membrane 10 is not particularly limited as long as it is a medium capable of moving hydroxide ions (OH ⁻ ) generated by the electrode catalyst of the cathode electrode 30 to the anode electrode 20. Not. Specifically, as the anion exchange membrane 10, for example, a solid polymer having an anion exchange group such as a primary to tertiary amino group, a quaternary ammonium group, a pyridyl group, an imidazole group, a quaternary bilidium group, and a quaternary imidazolium group. Examples include membranes (anion exchange resins). Examples of the solid polymer film include hydrocarbon-based and fluorine-based resins.

The anode electrode 20 and the cathode electrode 30 have the same structure. Specifically, both electrodes each have at least an electrode catalyst. The electrode catalyst of the anode electrode 20 takes out hydrogen atoms from the supplied fuel as shown in the above formula (1) or (2), and reacts with hydroxide ions that have passed through the anion exchange membrane 10 to produce water (H ₂ O) and a function as a catalyst for releasing electrons (e ⁻ ) to the current collector plate 40. On the other hand, the electrode catalyst of the cathode electrode 30 receives electrons (e ⁻ ) from the current collector plate 40 as shown in the above formula (3), and hydroxide ions from oxygen (O ₂ ) and water (H ₂ O). Has a catalytic action to produce

By the way, in order to improve the power generation performance of the fuel cell, the decomposition of the fuel of the formula (1) or (2) in the anode electrode 20 and the hydroxide ion (OH) from the oxygen of the formula (3) in the cathode electrode 30 ^-) generation and it is important to proceed efficiently for. For this reason, it is effective to increase the reaction area of the catalyst at each electrode. In the fuel cell of the embodiment, the following electrode catalyst is employed to increase the reaction area at each electrode.

  FIG. 2 is an enlarged view of a part of the anode 20 surrounded by a dotted line (A) in FIG. Although the electrode catalyst of the anode electrode 20 is shown in an enlarged manner in FIG. 2, the electrode catalyst of the cathode electrode 30 has the same configuration as described above. As shown in FIG. 2, the electrode catalyst 22 is a support having catalyst particles supported on a carrier, and the anode 20 and the cathode 30 in the fuel cell dissolve the same components as the anion exchange membrane 10. It is formed by being mixed with the electrolyte solution 12 and applied to the anion exchange membrane 10.

  The carrier of the electrode catalyst 22 is composed of Ni porous powder 24 (metal porous body). The Ni porous body powder 24 is a particle of several μm to several tens of μm, and has a plurality of pores 26 in the powder. The ratio of the pores 26 in the Ni porous body is 80 [Vol.%] To 96 [Vol.%].

  The Ni porous body powder 24 carries a plurality of catalyst particles 28 made of Fe—Co—Ni. The catalyst particles 28 promote the reaction shown in the above (1), (2), or (3) in each of the anode electrode 20 and the cathode electrode 30, and CC in fuel such as ethanol supplied to the anode electrode 20. It has a function of breaking bonds and can promote a reaction for generating hydrogen from fuel.

  Here, the catalyst particles 28 are supported on the surface of the Ni porous body powder 24 and inside the pores 26. Therefore, the reaction part (three-layer interface) of the electrode catalyst 22 is formed not only on the surface of the Ni porous powder 24 but also inside the pores 26, and a large reaction area is secured. When fuel is supplied to the electrode catalyst 22, the fuel penetrates into the pores 26, contacts the catalyst particles 28 on the surface of the electrode catalyst 22 and in the pores 26, and the above (1), (2) or (3 ) Reaction is promoted. Therefore, the power generation reaction can be promoted more efficiently, and the power generation performance of the fuel cell is improved.

  FIG. 3 is a diagram for explaining a method of forming the electrode catalyst 22 in the embodiment of the present invention. In [Step 01] in FIG. 3, first, an alloy powder of Ni and Al is produced. Here, the volume ratio of Ni and Al is 1: 9. Next, the produced Ni / Al alloy is pulverized to a size of several [μm] to several tens [μm] [step 02]. Next, the Ni / Al alloy is treated with an alkaline solution [Step 03]. Here, an alkaline solution having a concentration of about 2 [mol / l] is used. The Al portion of the Ni / Al alloy is dissolved by the treatment with the alkaline solution, and the Ni porous body powder 24 is produced.

  Next, Fe acetate, Co acetate, and Ni acetate are each dissolved in an acetic acid solution to prepare an acetic acid solution [Step 05]. The concentrations of the Fe acetic acid solution, the Co acetic acid solution, and the Ni acetic acid solution prepared here are 0.005 [mol / l] to 10 [mol / l], respectively. Next, a mixed solution is prepared by mixing the Fe acetic acid solution, the Co acetic acid solution, and the Ni acetic acid solution [Step 06]. The volume mixing ratio of each solution is equal. The temperature of the mixed solution is about 60 [° C.].

  Next, the Ni porous body powder 24 is mixed in the mixed solution prepared in Step 06 [Step 07]. The mixing ratio here is desirably in the range of 1:10 to 10: 1 [wt.%] By weight. More preferably, it is set to 1: 2 to 4: 1 [wt.%]. Next, vacuum deaeration is performed [step 08]. As a result of the vacuum degassing, the gas accumulated in the pores 26 is degassed, and a lot of the mixed solution enters into the pores 26 correspondingly.

  Next, the Ni porous body powder 24 is taken out from the solution by filtration or the like, and heat treatment is performed in an inert gas [step 09]. The temperature here is 400 [° C.]. As a result, an electrode catalyst is formed which is a support in which the Fe—Co—Ni catalyst in the mixed solution is supported on the surface of the Ni porous body powder 24 and in the pores 26. Thereafter, the carrier is mixed with the electrolyte solution 12 in which the same components as the electrolyte membrane are dissolved, and applied as the electrode catalyst 22 to the surface of the anion exchange membrane 10. As a result, an electrode catalyst made of Ni porous body powder 24 carrying Fe—Co—Ni catalyst as catalyst particles 28 is formed on both sides of the anion exchange membrane 10.

  By using the electrode catalyst 22 produced in this way, the area of the reaction part of the anode electrode 20 and the cathode electrode 30 can be increased. Therefore, the reaction in both electrode catalysts can be promoted, and the power generation performance of the fuel cell can be improved.

FIG. 4 is a diagram showing a result of verifying a relationship (IV characteristic) between a current density and a voltage of a fuel cell using an electrode catalyst according to an embodiment of the present invention and a conventional fuel cell. In the figure, the horizontal axis represents current density [A / cm ² ], and the vertical axis represents voltage [V]. In addition, as an electrode catalyst for a conventional fuel cell, a carbon-supported Fe—Co—Ni catalyst is used. From FIG. 4, it is confirmed that the power generation performance of the fuel cell of this embodiment is improved as compared with the conventional fuel cell. That is, it is confirmed that the power generation performance is improved by supporting the Fe—Co—Ni catalyst 28 on the Ni porous powder 24 as an electrode catalyst.

  In the embodiment, the case where the Fe—Co—Ni catalyst 28 is used as the catalyst particle has been described. By using the Fe—Co—Ni catalyst 28 as catalyst particles, when a fuel having a CC bond such as ethanol is supplied as the fuel, the CC bond is efficiently cut and the reaction at the anode 20 is promoted. be able to. However, in this invention, the catalyst particles are not limited to Fe—Co—Ni. For example, Fe, Co, Ni, Pt, or the like can be used as the catalyst particles.

  Specifically, for example, when Ni is used, a mixed solution of 0.005 [mol / l] to 10 [mol / l] in which Ni acetic acid is added to the acetic acid solution in [Step 05] of the preparation of the catalyst described above. Only prepare. Then, an electrode catalyst is produced by performing Step 07 to Step 10 without performing [Step 06].

FIG. 5 is a diagram showing a result of comparing and verifying IV characteristics of a fuel cell using an electrode catalyst in which Ni is used as catalyst particles and supported on a Ni porous powder, and a conventional fuel cell. In the figure, the horizontal axis represents current density [A / cm ² ], and the vertical axis represents voltage [V]. In addition, as an electrode catalyst for a conventional fuel cell, a carbon catalyst having a Ni catalyst supported thereon is used. FIG. 5 confirms that even when Ni is used as the catalyst particles, the power generation performance is improved by using the Ni porous body powder 24 as the carrier as compared with the conventional fuel cell.

  In the embodiment, the case where both the anode 20 and the cathode 30 have the same configuration has been described. However, the present invention is not limited to this, and power generation performance can be improved to some extent by using the electrode catalyst described in the embodiment for any one of the electrode catalysts. In this case, as an electrode catalyst for an electrode that does not use the electrode catalyst of the embodiment, for example, one composed of Fe, Co, Ni, Pt or the like, or any of these metals as a carrier such as carbon Those supported, organometallic complexes having these metal atoms as the central metal, or those having such an organometallic complex supported on a carrier can be used. Moreover, the diffusion layer comprised with the porous body etc. can also be arrange | positioned on the surface of each electrode electrode catalyst.

  In the embodiment, the case where the Ni porous body powder 24 is used as the carrier (metal porous body) for supporting the catalyst particles has been described. By using the Ni porous body powder 24, the reaction surface can be increased and the resistance of the electrode can be reduced. Further, the porous body itself functions as a catalyst, and the function as an electrode catalyst can be further improved. However, in the present invention, the metal porous body is not limited to this, and other metal porous bodies can also be used. Specifically, for example, a porous powder made of a metal such as Fe, Co, Cu, or Ru can be used instead of Ni.

  In addition, as a method for producing the Ni porous body powder, the Ni / Al alloy powder was produced and Al was dissolved. However, the method for producing the metal porous body in the present invention is not limited to this, and the metal porous body may be produced by other methods. Also, when creating Ni porous body powder, instead of Ni / Al alloy powder, alloy powder such as Ni / Sn, Ni / Zn, Ni / Pb is prepared and Sn, Zn, Pb is dissolved. Ni porous powder can also be produced. Similarly, when using a porous metal such as Fe, Co, Cu or Ru, Fe / Al, Co / Al, Cu / Al, Ru / Al, Fe / Sn, Co / Sn, Cu / Sn, Ru / Sn, Fe / Zn, Co / Zn, Cu / Zn, Ru / Zn, Fe / Pb, Co / Pb, Cu / Pb, Ru / Pb etc. alloy powders are prepared and Sn, Zn and Pb are dissolved respectively. By making it, these metal porous body powders can be created.

  In the embodiment, the case where an alkaline fuel cell using an anion exchange membrane is used as the fuel cell has been described. However, the present invention is not limited to such a fuel cell, and may be, for example, an alkaline cell using an electrolyte that transmits anions such as KOH instead of an anion exchange membrane.

  In the embodiment, the anode 20 and the cathode 30 are respectively disposed on both sides of the anion exchange membrane 10, and the reaction gas paths 50 and 60 are provided through the current collector plate 40, respectively. . However, the fuel cell is not limited to this, and has a stack structure in which a plurality of power generation units in which an anode electrode and a cathode electrode are arranged on both sides of an anion exchange membrane are stacked through current collector plates and separators. May be. Also in this case, a fuel cell with high power generation performance can be obtained by using the electrode catalyst of the present invention as each electrode.

  In the embodiment, the case where ethanol is used as the fuel has been described. This is because ethanol can be efficiently generated with a material that is available at a relatively low cost. However, in the present invention, the fuel is not limited to ethanol. As described in the embodiment, as the fuel when the anion exchange membrane 10 is used as the ion exchange membrane, for example, methane, ammonia or the like can be considered in addition to ethanol.

  In the above embodiment, when referring to the number of each element, quantity, quantity, range, etc., unless otherwise specified or clearly specified in principle, the number referred to It is not limited. Further, the structures described in the embodiments, steps in the method, and the like are not necessarily essential to the present invention unless otherwise specified or clearly specified in principle.

It is a figure for demonstrating the fuel cell in embodiment of this invention. It is a figure for demonstrating the electrode catalyst of the fuel cell in embodiment of this invention. It is a figure for demonstrating the preparation methods of the electrode catalyst of embodiment of this invention. It is a figure for demonstrating the characteristic of the fuel cell of embodiment of this invention. It is a figure for demonstrating the characteristic of the fuel cell of the other example of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Anion exchange membrane 20 Anode electrode 22 Electrocatalyst 24 Ni porous body powder 26 Pore 28 Catalyst particle 30 Cathode electrode 40 Current collecting plate 50 Fuel path 60 Oxygen path

Claims (7)

A porous metal body having a plurality of pores;
Catalyst particles carried on the surface and pores of the porous metal body,
An electrode catalyst for an alkaline fuel cell, comprising:   2. The electrode catalyst for an alkaline fuel cell according to claim 1, wherein the metal porous body is made of one or more metals selected from the group consisting of Fe, Co, Ni, Cu, and Ru.   The electrode catalyst for an alkaline fuel cell according to claim 1 or 2, wherein the catalyst particles are particles made of Fe, Co and Ni or Ni particles. An electrolyte membrane having a function of transmitting anions,
A pair of electrodes disposed on both sides of the electrolyte membrane,
An alkaline fuel cell, wherein at least one of the pair of electrodes is the electrode catalyst according to any one of claims 1 to 3. A metal obtained by dissolving the second metal from an alloy of the first metal, which is a material of the porous metal body, and any second metal of the metal group consisting of Al, Sn, Zn, and Pb using an alkaline solution. Producing porous bodies,
The metal porous body is added to a mixed solution in which an acetate of a third metal serving as catalyst particles is dissolved in an acetic acid solution,
The mixed solution to which the metal porous body is added is vacuum degassed,
The metal porous body is taken out from the mixed solution after the vacuum degassing,
Heating the porous metal body,
A method for producing an electrode catalyst for an alkaline fuel cell.   The said metal porous body consists of any one or more metals in the metal group which consists of Fe, Co, Ni, Cu, and Ru, The preparation of the electrode catalyst for alkaline fuel cells of Claim 5 characterized by the above-mentioned. Method.   The method for producing an electrode catalyst for an alkaline fuel cell according to claim 5 or 6, wherein the third metal is one or more metals selected from the group consisting of Fe, Co, and Ni.

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