JP2003163010A - Method for manufacturing electrode of fuel battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing the electrode of a fuel battery in which the composition and the concentration of an electrode constituting component in the electrode of a predetermined arbitrary shape are changed in a three-dimensional manner. <P>SOLUTION: (1) The method for manufacturing the electrodes 14, 17 of fuel the battery comprises the steps of charging a photosensitive drum, emitting a light to the drum to discharge the emitted part in response to the intensity of the light, adhering an electrode material to the electrified site in response to the intensity of the charging by a static electricity, transferring the material to a film, and performing a plurality of times the previous steps to form the electrodes. In this method, the types of the electrode materials 12P, 15P are differentiated at each step, and the thickness of the coating layer is controlled at each time, thereby controlling the electrode structure in the three-dimensional manner. (2) When the manufacture of the electrodes of the fuel battery is dealt with color copying, the type of the electrode material of the each time corresponds to the color of the color copying, and the thickness of the coating layer of each time corresponds to the density of the color to be coated at the time. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a solid polymer electrolyte fuel cell electrode in which a plurality of different types of catalyst layers are applied in layers.

[0002]

2. Description of the Related Art A solid polymer electrolyte fuel cell is a membrane-electrode assembly composed of an electrolyte membrane composed of an ion exchange membrane, an anode arranged on one side of the electrolyte membrane and a cathode arranged on the other side of the electrolyte membrane. (MEA: Membrane
-Electrode Assembly) and a separator that forms a fluid flow path for supplying fuel gas (hydrogen) and oxidizing gas (oxygen, usually air) to the anode and cathode to form a cell stack, A terminal (electrode plate), an insulator, and an end plate are arranged at both ends of the cell stacking direction, the cell stacking body is fastened in the cell stacking direction, and a fastening member (for example, a tension plate) extending outside the cell stacking body in the cell stacking direction. It consists of a stack fixed at. The anode and the cathode have a catalyst layer. A diffusion layer is provided between the catalyst layer and the separator. In a solid polymer electrolyte fuel cell, hydrogen is converted into hydrogen ions and electrons on the anode side, the hydrogen ions move to the cathode side in the electrolyte membrane, and on the cathode side, oxygen, hydrogen ions and electrons (adjacent The electrons generated at the MEA anode come through the separator, or the electrons generated at the cell anode at one end of the cell stack come through the external circuit) to generate water. Anode side: H ₂ → 2H ⁺ + 2e ⁻ Cathode side: 2H ⁺ + 2e ⁻ + (1/2) O ₂ → H ₂ O An electrolyte membrane having a thickness of about 10 to 100 μm is usually used. The catalyst layers each have a thickness of about 1 to 10 μm, and are applied on both sides of the electrolyte membrane or on one side of the diffusion layer (consisting of carbon paper and carbon cloth).
It is formed. As a method of applying an electrode (anode, cathode) material to the electrolyte membrane, conventionally, a wet application method of directly applying by printing, roller coating, spraying or the like, or a thermal transfer of a catalyst layer previously applied to a polytetrafluoroethylene sheet or the like ( There is a method of adhering to the electrolyte membrane by hot pressing) and removing the sheet. Further, as a special coating method, Japanese Patent Application Laid-Open No. 3-295168 discloses a method of statically attaching an electrode material of a fuel cell to the entire surface of an electrolyte membrane.

[0003]

[Patent Document 1] Japanese Patent Application Laid-Open No. 3-29516
Since the method of Japanese Patent Publication No. 8 is a dry coating method, problems such as the attack of the solvent on the electrolyte membrane and the generation of cracks in the electrodes due to swelling / contraction in conventional wet coating can be eliminated, but the following problems still exist. That is, it is not possible to form an electrode in which the composition and concentration of the electrode constituents are three-dimensionally changed (in at least one direction of the electrode thickness direction and the in-plane direction orthogonal to the electrode thickness direction) in the electrode having the predetermined shape pattern. Can not. An object of the present invention is to provide a fuel cell electrode in which the composition and concentration of electrode constituents in an electrode having an arbitrary predetermined shape are three-dimensionally changed (in the electrode thickness direction and at least one direction in the plane orthogonal thereto). It is to provide a manufacturing method of.

[0004]

The present invention which achieves the above object is as follows. (1) Charge the photoconductor drum, irradiate it with light, remove static electricity depending on the intensity of light, attach the electrode material to the charged part with static electricity according to the intensity of charge, and transfer it to the film. In a method of manufacturing a fuel cell electrode in which an electrode is formed by performing a plurality of times, the type of electrode material is made different at each time, the thickness of the coating layer is controlled at each time, and the electrode structure is three-dimensionally controlled. Manufacturing method. (2) When the production of fuel cell electrodes is adapted to color copying, the type of electrode material at each time corresponds to the color of the color copying, and the coating layer thickness at each time corresponds to the color depth applied at that time. A method for manufacturing a fuel cell electrode according to (1) above. (3) The electrode material is mixed with carbon particles, the catalytic noble metal supported on the carbon particles, and the carbon particles and the catalytic noble metal before or after the carbon particles and the catalytic noble metal are transferred to the film. The fuel according to (1), which contains a binder as a component, and the type of electrode material is made different by making at least one of the type, mixing ratio, mixing form, and particle size of each component different. Battery electrode manufacturing method.

In the above methods (1) to (3) of manufacturing a fuel cell electrode, since the type of electrode material is made different each time and the coating layer thickness is controlled at each time, the structure of the electrode (composition / density, film thickness) is controlled. Etc.) can be arbitrarily controlled three-dimensionally (in the electrode thickness direction and in the in-plane direction orthogonal thereto). When this method is applied to color copying (color copying), the type of electrode material at each time corresponds to the color of the color copying, and the coating layer thickness at each time corresponds to the depth of the color applied at that time. The kind of the electrode material can be changed by making at least one of the mixing ratio of the components, the mixing form, and the particle size of each component different. This method is a dry method because it is the adhesion and transfer of the electrode material to the surface of the photoconductor drum due to static electricity, and there is no attack of the electrolyte membrane of the solvent in conventional wet coating and no electrode cracking due to swelling / contraction. .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A method for manufacturing a fuel cell electrode according to the present invention will be described below with reference to FIGS. A fuel cell having an electrode manufactured by the method for manufacturing a fuel cell electrode of the present invention is a solid polymer electrolyte fuel cell 10. The fuel cell 10 of the present invention is mounted in, for example, a fuel cell vehicle. However, it may be used for other than automobiles.

As shown in FIGS. 1 and 2, the solid polymer electrolyte fuel cell 10 includes an electrolyte membrane 11 made of an ion exchange membrane and an anode 1 arranged on one surface of the electrolyte membrane 11.
4 and the cathode 17 arranged on the other surface of the electrolyte membrane 11
Membrane-electrode assembly (MEA: Membrane-E)
lectrode assembly) and a plurality of fuel gas flow passages 27 for supplying a fuel gas (hydrogen) and an oxidizing gas (oxygen, usually air) to the anode and cathode, and a separator 18 forming an oxidizing gas flow passage 28 in a stacked manner. A stack of cells 19 is provided, and terminals 20 are provided at both ends of the stack in the cell stacking direction.
(Electrode plate), insulator 21, end plate 22
Is arranged, the cell stack is fastened in the cell stacking direction, and a fastening member (tension plate 24) extending outside the cell stacking body in the cell stacking direction, and a stack 23 fixed by bolts 25. Anode 14 and cathode 17 are catalyst layers 1
2 and 15. Catalyst layers 12, 15 and separator 18
Diffusion layers 13 and 16 are provided between and. The separator 18 has a coolant for cooling the cells (usually cooling water).
A coolant flow path 26 through which the air flows is also formed.

Electrodes 14, 18 comprising catalyst layers 12, 15
Is applied to both sides of the electrolyte membrane 11 or applied to one side of the diffusion layers 13 and 16. The electrode forming material is carbon powder carrying a catalytic noble metal (for example, Pt). The electrode forming material of carbon powder and catalytic noble metal is electrically conductive but non-magnetic.
It is different from the toner of the copying machine in that it is non-magnetic. As the electrode forming material, a material mixed with a binder (electrolyte) powder may be used. The electrolyte membrane is non-magnetic,
It is non-conductive.

As shown in FIGS. 3 and 4, the apparatus for carrying out the method for producing a fuel cell electrode according to the present invention has a plurality of electrode material transfer portions arranged in sequence in the film feeding direction. Each electrode material transfer unit includes a photoconductor drum 30, a charging roller 31 that charges the surface of the photoconductor drum 30 with static electricity, and a predetermined pattern on the photoconductor drum surface by projecting light onto the photoconductor drum 30. A light projecting device 32 (which removes charge from the portion where the laser light is projected) for removing the charge other than the portion other than the electrode layer is formed), and a container 33 containing the electrode material powders 12P and 15P. A material supply roller 34 for supplying the electrode material powders 12P and 15P to the surface of 30;
Electrolyte 11 or diffusion layer 1 between photoconductor drum 30
The membrane 11 (or 13, 16)
However, in the following description, the film 11 will be referred to as the film 11) and another drum 30A or roller 30B that is pressed against the photoconductor drum 30 and a fixing roller 35 provided downstream of the photoconductor drum 30 in the feeding direction of the film 11. And consists of.

An electrode material transfer section having a photoconductor drum 30, a charging roller 31, a material supply roller 34, and another drum 30A or roller 30B that comes into pressure contact with the photoconductor drum 30, and a fixing section having a fixing roller 31. Is
It is arranged in an inert gas atmosphere 36. The inert gas is, for example, nitrogen. Arranged in the inert gas atmosphere 36 is a heating atmosphere (for example, the fixing roller 35).
Is applied at a temperature of 50 to 150 ° C.), so that there is no fear of ignition of the carbon powder and safety is ensured.

The apparatus for carrying out the method for producing a fuel cell electrode of the present invention is fixed when the electrode material powders 12P and 15P are not sprinkled with a binder (the binder is an electrolyte) or mixed with binder particles. It may further have a binder supply device 37 provided downstream of the roller 35 in the feeding direction of the film 11 and a drying unit 40 provided downstream thereof. The binder supply device 37 constitutes a binder application unit. Electrode material powder 12P, 1
When 5P is sprinkled with a binder or mixed with binder particles, the binder supply device 37 and the drying unit 40 may not be provided. Drying section 40 is at room temperature to 15
Have a temperature of up to 0 ° C. and dry the binder.

In the method of manufacturing the fuel cell electrode of the present invention, the electrode material powders 12P and 15P are electrostatically charged to the photosensitive drum 30.
The step of holding it above, and the transfer of the electrode material powder on the photoconductor drum 30 (including the case of once transferring from the photoconductor drum 30 to the intermediate medium film and then transferring from the intermediate medium film to the target film) The step of transferring to a target film (hereinafter, the case where the film is the electrolyte film 11 is taken as an example, but the diffusion layer films 13 and 16 may be used), and the transferred electrode material powders 12P and 15P having a predetermined pattern are transferred to the film 11. And a fixing step.

In the process of electrostatically holding the electrode material powder on the photosensitive drum 30, the charging roller 31 is used.
Is contacted with the photoconductor drum 30 to electrostatically charge the surface of the photoconductor drum 30 and a laser beam is applied to the surface of the photoconductor drum 30 with a certain pattern to eliminate the charge according to the intensity of the light, and The electrode material powders 12P and 15P are supplied to cause the electrode material powders 12P and 15P to be electrostatically held at the charged portions of a predetermined pattern (the pattern opposite to the static elimination portion pattern) on the surface of the photosensitive drum 30 according to the strength of the charge. . In the case of a copy machine, the powder is magnetically held on the drum, but in the present invention, the electrode material powders 12P and 15P are held on the photosensitive drum 30 by static electricity. Then, the electrostatically held electrode material powders 12P and 15P are transferred to the film 11. By performing this transfer once at a plurality of electrode material transfer sites, an electrode that has been applied a plurality of times is formed when all the electrode material transfer sites have been passed.

FIG. 5 shows an example of the predetermined pattern. In FIG. 5, the in-plane structure of the catalyst layer is divided into a portion corresponding to the gas flow paths 27 and 28 (a portion indicated as “black”) and a portion corresponding to the separator rib (a portion indicated as “red”). It shows what has changed. Since the diffusion layers 13 and 16 are not pressed by the separator ribs in the portions corresponding to the gas flow paths 27 and 28, a sufficient amount of gas can flow and a power generation reaction can occur, so it is desirable that the catalyst components be large. Since gas flow is insufficient in the pressed portion, it is desirable to reduce the amount of expensive catalyst components by reducing the amount of catalyst components. This condition can be easily satisfied by changing the pattern of irradiating the laser light and the intensity of the light (the rib corresponding part makes the laser light amount strong and the gas passage corresponding part makes the laser light amount zero or weak). It is possible to achieve both optimum output and cost reduction.

In the step of fixing the electrode material powders 12P and 15P having the predetermined pattern transferred to the film 11 on the film 11, the fixing is performed with a predetermined pressure and a predetermined heat.
The pressure is 4 MPa or more, which is about 10 times that of a copying machine.
And the temperature is preferably 50 to 150 ° C. 150 ° C
This is because the film 11 is damaged by the temperature above, and the heating effect is small at 50 ° C. or lower. About 80 to 120 ° C is preferable.

After the step of fixing the transferred electrode material powders 12P and 15P consisting of carbon particles and catalytic noble metal on the film 11 with the fixing roller 35,
You may provide the process of apply | coating the liquid binder 38 on the fixed electrode material powder, and the process of drying the applied liquid binder. Liquid binder 38 is roller 39
It may be applied or spray applied. These steps are provided for the film 1 of the electrode material powders 12P and 15P.
This is to make fixing to 1 more complete.

However, in the step of holding the electrode material powders 12P and 15P on the photosensitive drum 30 in a predetermined pattern by static electricity, the electrode material powders 12P and 15P made of carbon and catalytic noble metal may be pre-coated with a binder, Alternatively, when a powder binder is mixed in advance with the electrode material powders 12P and 15P composed of carbon and catalytic noble metal, the electrode material powders 12P and 15P composed of carbon, catalytic noble metal and binder are mixed in the film 11 in the fixing step.
Therefore, the liquid binder 38 coating step and its drying step may be omitted.

In the method of the present invention, as shown in FIGS. 6 to 8, when the electrodes 14 and 17 are formed by transferring the electrode materials 12P and 15P to the film 11 a plurality of times, the electrodes are formed at each time. The materials 12P and 15P are made different in type, the coating layer thickness is controlled each time, and the electrode structure is three-dimensionally controlled. When the manufacturing of the fuel cell electrode is adapted to color copying, the type of electrode material at each time corresponds to the color of the color copying, and the coating layer thickness at each time corresponds to the depth of the color applied at that time.

The electrode materials 12P and 15P are carbon particles,
A catalyst noble metal supported on the carbon particles and a binder mixed with the carbon particles and the catalyst noble metal before or after the carbon particles and the catalyst noble metal are transferred to a film are contained as components. The kind of electrode material is made different by making at least one of the kind of components, the mixing ratio, the mixing form, and the particle size of each component different. More specifically, change the diameter and shape of the carbon particles, or change the type of noble metal supported on the carbon particles (platinum, ruthenium, or a mixture of two or more precious metals, or a mixture of different noble metals). Whether the content ratio of carbon, noble metal and electrolyte is changed, or how to mix the electrolyte is changed (whether the noble metal-supported carbon particles are sprinkled with the electrolyte, or the electrolyte particles are mixed with the noble metal-supported carbon particles). , Etc.) and the like, the kind of electrode material can be changed.

The colors for color copying are blue, red (magenta),
There are four colors, yellow and black, but the number of colors need not be limited to four in the case of an electrode material. Then, as many electrode material accommodating devices 33 of the electrode material transfer portion as the number of kinds of electrode materials are installed in the film feeding direction, and each kind of electrode material is separately put in the electrode material accommodating device 33 and sent. Various electrode materials are sequentially applied to the film 11.

7 and 8 are four types (4 in color copying).
An example of the cross-sectional structure of the electrodes 14 and 17 in the case where the (color) electrode material is applied over the electrolyte membrane 11 is shown. Figure 7
In the above example, the first catalyst layer is formed by applying an electrode material of the first type (for color copying, for example, the color is “black”) on the plane of the electrolyte membrane with a shade in the in-plane direction. The second catalyst layer has a second type (for color copying, for example, “yellow”) of electrode material with a different thickness in the in-plane direction on the plane of the first catalyst layer (for color copying, Apply shades) and paint again. The third catalyst layer has a third type (for color copying, for example, "red") of electrode material with a different thickness in the in-plane direction on the plane of the second catalyst layer (for color copying, Apply shades) and paint again. The fourth catalyst layer has a fourth type (for color copying, for example, “blue”) of an electrode material having a different thickness in the in-plane direction on the plane of the third catalyst layer (for color copying, Apply light and shade and paint again. As a result, the electrodes 14 and 17 having the sectional structure shown in FIG. 8 are formed. In this case, the thickness of the electrode composed of a plurality of layers is preferably constant in order to make the contact pressure uniform.

For example, the hydrogen concentration decreases along the fuel gas passage from the hydrogen inlet to the hydrogen outlet, and the oxygen concentration also decreases along the oxidizing gas passage from the air inlet to the air outlet. When performing uniformly in the cell plane,
For example, the catalyst metal ratio of the anode 14 is increased on the hydrogen outlet side as compared with the hydrogen inlet side, and the catalyst metal ratio of the cathode 17 is increased on the air outlet side as compared with the air inlet side. The coating control is performed by the flow pattern of the reaction gas, the design concentration of the reaction gas along the flow path, the temperature, the humidity, the design current density in the cell plane, the type of various electrode materials put in each electrode material accommodation device 33, And the like are input to a computer to calculate the intensity value of the light to be projected by the light projecting device 32, and the output value is sent to the light projecting device 32 to perform light projecting scanning in the in-plane direction. This can be easily performed by controlling the intensity of the projected light.

Next, the operation of the above-described method of the present invention will be described. First, the entire surface of the photosensitive drum 30 is charged, and when laser light is projected, pattern exposure is performed on a portion not coated with an electrode material to eliminate that portion, and only the portion charged with static electricity is charged with the electrode material powder 12P. Since 15P is attached and transferred to the film formed of the electrolyte 11 or the diffusion layers 13 and 16, the electrodes 14 and 17 having an arbitrary shape or the electrodes 14 and 17 having an arbitrary shape can be controlled by controlling the exposure pattern and the strength of each portion of the exposure pattern.
Electrodes 14 having different concentrations and the like at each site in the predetermined shape,
You can make 17.

That is, because of the pattern exposure, the electrodes 14 and 17 having an arbitrary shape can be obtained, and even within the shape, the electrode density (shading in terms of copy) can be changed. For example, a portion of the separator corresponding to the groove (gas flow path) is formed with a high concentration of electrode material powder, and a portion of the separator rib (a portion other than the gas flow path) pressed against the diffusion layer is filled with the electrode material powder. It can be formed at a low concentration and the amount of expensive catalytic precious metal applied can be reduced. In addition, since the concentration of the gas becomes lower toward the downstream side, the coating concentration of the electrode material powder can be changed in accordance with it, which can contribute to uniform power generation along the flow path. Conventionally, it is not possible to change the pattern or density in such a cell plane, but in the present invention, it is possible to easily change it like a copy.

Also, the electrode material powder 12P due to static electricity,
The present invention is a dry method because the 15P adheres to the surface of the photoconductor drum 30 and is transferred (transferred to the film 11). Problems such as cracks are eliminated.

Next, the methods shown in the embodiments of FIGS. 3 and 4 will be described. In the embodiment shown in FIG. 3, the electrode material powders 12P and 15P are applied to both surfaces of the membrane 11 to form the catalyst layer 12,
15 is formed. The membrane 11 is fed from top to bottom. The electrode material transfer process and the fixing process thereof are performed multiple times in the film feeding direction. The illustrated example shows a case in which it is executed a plurality of times (in the example of FIG. 3, the case is shown twice, but the number is not limited to two times), and the first electrode material transfer portion, its fixing portion, and the second time The electrode material transfer section and its fixing section are sequentially provided in the film feeding direction, and coating and fixing are performed. Further, since the electrode material powders 12P and 15P in the electrode material powder storage container 33 are not sprinkled with a binder or mixed with binder particles, the binder coating step and the binder drying step are performed after the final fixing step. It is provided. The binder is applied by roll coating, for example. In the method of FIG. 3, different kinds of electrode materials 12P (15p) are put in the electrode material powder storage containers 33, and at each electrode material transfer section, the coating pattern shape, concentration, and
The layer thickness can be varied. Thereby, the coating pattern shape, concentration, composition in the in-plane direction of the cell, and layer thickness, composition, etc. in the thickness direction can be changed.
The structure of 17 can be changed in three dimensions.

In the embodiment of FIG. 4, the membrane 11 (or 13,
16) In the electrode material transfer portion provided in plural on one surface in the film feeding direction, the electrode material powders 12P and 15P are applied a plurality of times (the number of times in the illustrated example is 2, but not limited to 2), After applying the layer, the applied electrode material is applied to the film 11 at the fixing unit 35.
(Or 13, 16) is fixed, and the electrodes 14, 17 are formed. The membrane 11 (or 13, 16) is fed horizontally. Electrode material powder 12 in the electrode material powder container 33
Since P and 15P are not sprinkled with a binder or mixed with binder particles, a binder coating step and a binder drying step are provided after the fixing step. In the method of FIG. 4, different kinds of electrode materials 12P (15p) are put in the electrode material powder container 33, and the coating pattern shape, concentration, and layer thickness of each layer are changed in each electrode material transfer section. be able to. Thereby, the coating pattern shape in the cell in-plane direction, the concentration, the composition,
Also, the layer thickness, composition, etc. in the thickness direction can be changed, and the structure of the electrodes 14, 17 can be changed three-dimensionally.

[0028]

According to the method for producing a fuel cell electrode of claims 1 to 3, since the type of electrode material is made different each time and the coating layer thickness is controlled at each time, the structure of the electrode (composition / density, film Thickness, etc.) can be arbitrarily controlled three-dimensionally (in the thickness direction of the electrode and in the in-plane direction orthogonal thereto). Also,
This method is a dry method because it is the adhesion and transfer of the electrode material to the surface of the photoconductor drum due to static electricity, and there is no attack of the electrolyte membrane of the solvent in conventional wet coating and no electrode cracking due to swelling / contraction. . According to the manufacturing method of the fuel cell electrode of the second aspect, this method can be applied to color copying. In that case, the type of electrode material at each time corresponds to the color of the color copy, and the thickness of the coating layer at each time corresponds to the depth of the color applied at that time. According to the method for producing a fuel cell electrode of claim 3, the type of electrode material is
It can be changed by changing at least one of the mixing ratio of the components, the mixing form, and the particle size of each component.

[Brief description of drawings]

FIG. 1 is an overall front view of a fuel cell having an electrode manufactured by a method for manufacturing a fuel cell electrode of the present invention.

FIG. 2 is an enlarged cross-sectional view of the cell of FIG.

FIG. 3 is a side view of an apparatus for carrying out a method for manufacturing a fuel cell electrode according to an embodiment of the present invention.

FIG. 4 is a side view of an apparatus for carrying out a method for manufacturing a fuel cell electrode according to another embodiment of the present invention.

FIG. 5 is a plan view showing a coating pattern of a fuel cell electrode manufactured by the method for manufacturing a fuel cell electrode according to the present invention.

FIG. 6 is a plan view showing a gas pressure / concentration distribution along a flow path of a fuel cell electrode manufactured by the method for manufacturing a fuel cell electrode of the present invention.

FIG. 7 is a plan view of each coating layer showing changes in concentration (corresponding to color) in the coating surface after each coating in the method for producing a fuel cell electrode of the present invention.

FIG. 8 is a cross-sectional view in the thickness direction of the electrode, in which a plurality of coating layers of each time in FIG.

[Explanation of symbols]

10 (Polymer electrolyte type) fuel cell 11 Electrolyte membrane 12 Catalyst layer 12P electrode material powder (for anode) 13 Diffusion layer 14 electrodes (anode, fuel electrode) 15 Catalyst layer 15P electrode material powder (for cathode) 16 diffusion layer 17 electrodes (cathode, air electrode) 18 separator 19 cells 20 terminals 21 insulator 22 End plate 23 stack 24 tension plate 25 volts 30 photoconductor drum 30A Opposing drum 30B Opposing roller 31 charging roller 32 Projector (laser light projector) 33 Electrode material storage device 34 Electrode material powder supply roller 35 fixing roller 36 Inert gas atmosphere 37 Binder coating unit 38 Binder 39 Binder coating roller 40 Drying section

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Claims (3)

[Claims] 1. A photosensitive drum is charged, and light is irradiated to remove static electricity from the irradiated portion according to the intensity of light, and an electrode material is electrostatically attached to the charged portion according to the strength of charging and transferred to a film. In a method for manufacturing a fuel cell electrode in which the electrode is formed by performing the above-mentioned multiple times, the type of electrode material is made different at each time, the coating layer thickness is controlled at each time, and the fuel is controlled three-dimensionally at the electrode structure. Battery electrode manufacturing method. 2. When the production of a fuel cell electrode is adapted to color copying, the type of electrode material at each time corresponds to the color of the color copying, and the coating layer thickness at each time is the depth of the color applied at that time. The method for manufacturing a fuel cell electrode according to claim 1, which corresponds to. 3. The electrode material is mixed with carbon particles, a catalytic noble metal supported on the carbon particles, and the carbon particles and the catalytic noble metal before or after the carbon particles and the catalytic noble metal are transferred to a film. 2. The type of electrode material is made different by containing at least one of the types, mixing ratios, mixing forms, and particle sizes of the respective components, which contains the binder as a component. Of manufacturing a fuel cell electrode of.