Electrode for fuel cell and method for manufacturing membrane-electrode assembly

Abstract

The present invention relates to an electrode for a fuel cell and a method for manufacturing a membrane-electrode assembly. A method for manufacturing the electrode for a fuel cell comprises a step of spray-coating an active metal solution on a first layer containing a carbon-based material to form a second layer containing an active metal.

Description

Method for manufacturing electrodes and membrane-electrode assemblies for fuel cells

[0001] This invention relates to a method for manufacturing an electrode and a membrane-electrode assembly for a fuel cell.

[0002]

[0003] A fuel cell electrochemically produces water by using hydrogen as fuel at the anode and air as fuel at the cathode. A representative example of such a fuel cell is the Polymer Electrolyte Membrane Fuel Cell (PEMFC).

[0004] Electrons move from the anode to the cathode through the electrical load, and at the cathode, oxygen combines with electrons and hydrogen cations generated from hydrogen as shown in the equation below to be reduced and produce water.

[0005] To increase the reaction rate at the above electrode (the anode and / or the cathode), a catalyst may be applied, and as such a catalyst, a Pt / C catalyst in which platinum (Pt) is supported on a carbon-based material having a large specific surface area and excellent electrical conductivity is most widely used.

[0006] However, when applying the Pt / C catalyst to the electrode, a dead area where platinum (Pt) is not activated may occur. Therefore, in order to realize a high-performance electrode, an excessive amount of Pt / C catalyst must be used, but the unit cost of the electrode increases due to the excessive use of platinum (Pt), which is a hindering factor in the commercialization of fuel cells.

[0007]

[0008] One embodiment provides a method for manufacturing an electrode for a fuel cell that can secure excellent electrode performance while reducing the amount of active metal used and increases process convenience.

[0009]

[0010] One embodiment provides a method for manufacturing an electrode for a fuel cell, comprising the step of spray-coating an active metal solution onto a first layer comprising a carbon-based material to form a second layer comprising an active metal.

[0011] Another embodiment provides a method for manufacturing a membrane-electrode assembly comprising a method for manufacturing an electrode for a fuel cell.

[0012]

[0013] A method for manufacturing an electrode for a fuel cell according to one embodiment can secure excellent performance of the electrode by reducing the amount of active metal used while increasing the activity rate.

[0014] Accordingly, by using the fuel cell electrode manufactured according to one embodiment, a high-performance membrane-electrode assembly can be produced at a low cost, and the commercialization of the fuel cell can be accelerated.

[0015] Meanwhile, the spray coating method used in one embodiment allows for coating without loss of active metal while being simple, thereby enabling additional cost reduction compared to other methods and increasing process convenience.

[0016]

[0017] FIGS. 1 and 2 are schematic diagrams illustrating a method for manufacturing an electrode for a fuel cell in one embodiment.

[0018] FIG. 3 is a diagram briefly illustrating the membrane-electrode assembly of Comparative Example 1 and the reaction within a fuel cell containing the same.

[0019] FIG. 4 is a diagram briefly illustrating the membrane-electrode assembly of Example 1 and the reaction in a fuel cell containing the same.

[0020] FIG. 5 is a diagram briefly illustrating the membrane-electrode assembly of Example 2 and the reaction within a fuel cell containing the same.

[0021] FIG. 6 is a diagram briefly illustrating the membrane-electrode assembly of Example 3 and the reaction within a fuel cell containing the same.

[0022] FIG. 7 is a diagram briefly illustrating the membrane-electrode assembly of Example 4 and the reaction in a fuel cell containing the same.

[0023] FIG. 8 is a diagram briefly illustrating the membrane-electrode assembly of Example 5 and the reaction in a fuel cell containing the same.

[0024] FIG. 9 is a diagram briefly illustrating the membrane-electrode assembly of Example 6 and the reaction in a fuel cell containing the same.

[0025] FIG. 10 is a diagram briefly illustrating the membrane-electrode assembly of Example 7 and the reaction in a fuel cell containing the same.

[0026] FIG. 11 is a diagram briefly illustrating the membrane-electrode assembly of Example 8 and the reaction in a fuel cell containing the same.

[0027]

[0028] The advantages and features of the technology described below, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the forms of implementation are not limited to the embodiments disclosed below. Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning that is commonly understood by those skilled in the art. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise. Throughout the specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0029] In addition, the singular form includes the plural form unless specifically mentioned otherwise in the phrase.

[0030]

[0031] (Method for manufacturing electrodes)

[0032] A method for manufacturing an electrode for a fuel cell is provided, comprising the step of spray-coating an active metal solution onto a first layer containing a carbon-based material to form a second layer containing an active metal.

[0033]

[0034] The electrode for a fuel cell in one embodiment may be a cathode or an anode. The cathode and anode of the fuel cell, as well as both of them, may be applied as electrodes for a fuel cell in one embodiment.

[0035]

[0036] FIGS. 1 and 2 are schematic diagrams illustrating a method for manufacturing an electrode for a fuel cell in one embodiment. Hereinafter, a method for manufacturing an electrode for a fuel cell in one embodiment will be described in detail with reference to FIGS. 1 and 2.

[0037]

[0038] multilayer structure

[0039] First, the structure of the electrode obtained finally is explained.

[0040]

[0041] In the reaction of a polymer electrolyte membrane fuel cell (PEMFC) as described below, the ORR reaction (cathode), which determines the rate, has a large number of 4-electron reactions and is very slow compared to the HOR reaction (anode), thus determining the overall performance of the PEMFC.

[0042] Anode: H2 -> 2H + + 2e - , E o = 0.00 V

[0043] Cathode: 1 / 2O2 + 2H + + 2e - -> H2O, E o = 1.23 V

[0044] Total: H2 + 1 / 2O2 → H2O, E o = 1.23 V

[0045]

[0046] In this regard, the electrodes for fuel cells known to date (anode and / or cathode, mainly the cathode) have a single-layer structure containing a Pt / C catalyst.

[0047] The above Pt / C catalyst has a structure in which platinum (Pt) is supported on a carbon-based material, and the position of platinum (Pt) has a major influence on the overall reaction of the aforementioned fuel cell.

[0048] For example, if two or more platinum (Pt) atoms cover each other's active surfaces, or if platinum (Pt) atoms are located in a place where there is no ion conductor (e.g., an ionomer or polymer), the active metal may not be activated, resulting in a dead area.

[0049] This can be a contributing factor to the aforementioned disadvantages, such as excessive use of platinum (Pt), increased unit costs of electrodes, and hindrance to the commercialization of fuel cells.

[0050]

[0051] On the other hand, the electrode for a fuel cell of one embodiment is not a single-layer structure containing a Pt / C catalyst, but a multi-layer structure including a first layer containing a carbon-based material and a second layer containing an active metal.

[0052] Specifically, the first layer may be a 'carbon layer' that does not contain an active metal, and the second layer may be an 'active metal layer' that does not contain a carbon-based material. By separating the carbon layer (first layer) and the active metal layer (second layer) in this way, the amount of active metal used can be reduced while increasing the activity rate, thereby ensuring excellent performance of the electrode.

[0053] Specifically, when the structure is a multilayer structure comprising a first layer containing the carbon-based material and a second layer containing an active metal, the active metal can be evenly distributed in the second layer in contact with the polymer electrolyte membrane or gas diffusion layer, thereby suppressing the dead area while increasing the activity rate of the active metal.

[0054] In addition, when the structure is a multilayer structure comprising a first layer containing the carbon-based material and a second layer containing an active metal, the step of supporting the active metal on the carbon-based material (i.e., the catalyst synthesis step) can be omitted, thereby having the advantage of simplifying the entire fabrication process leading to the electrode, membrane-electrode assembly, and fuel cell.

[0055]

[0056] In other words, the fuel cell electrode of one embodiment can reduce the amount of active metal used by about 10 to 30% within the same performance, thereby lowering the unit cost and reducing the thickness of the electrode to increase the efficiency of the fuel cell.

[0057] Accordingly, by using the electrode for a fuel cell of one embodiment, a high-performance membrane-electrode assembly can be manufactured at a low cost, and the commercialization of fuel cells can be accelerated.

[0058]

[0059] carbonaceous materials

[0060] The above carbon-based material is not particularly limited as long as it is a carbon-based material already used as a carrier in the industry.

[0061]

[0062] The above carbon-based material has a BET specific surface area of ​​0 m 2 / g exceeding 2000 m 2 Those with a value of / g or less may be used. For example, among carbon-based materials conventionally used as carriers in the industry, those with a BET specific surface area of ​​0 m 2 / g exceeding 200 m 2 Carbonaceous materials with a specific surface area of ​​200 m² or less / g 2 / g exceeding 700 m 2 Carbonaceous materials with a specific surface area of ​​700 m² or less / g or less, or BET specific surface area of ​​700 m² 2 / g or more to 2000 m 2 Carbon-based materials with a value of 1g or less can be selected.

[0063]

[0064] The above carbon-based material may include carbon black, graphite, carbon nanofibers, graphitized carbon nanofibers, carbon nanotubes, carbon nanohorns, carbon nanowires, or a combination thereof. Carbon black may include, for example, Denka black, Ketjen black, acetylene black, channel black, furnace black, lamp black, thermal black, or a combination thereof. For example, carbon black may be used as the above carbon-based material.

[0065]

[0066] active metal

[0067] The above active metal is not particularly limited as long as it is widely used in the industry, but may include precious metals including platinum, palladium, iridium, ruthenium, and silver; non-precious metals including nickel, cobalt, and iron; or a combination thereof.

[0068]

[0069] ion conductor

[0070] The first layer containing the carbon-based material and the second layer containing the active metal may each independently further include an ion conductor, wherein the ion conductor is not particularly limited as long as it is an ion conductor conventionally used in the art. For example, the ion conductor may be an ionomer or a polymer having ion conductivity.

[0071]

[0072] Loading amount for each floor

[0073] The first layer containing the above carbon-based material has a loading amount per area of ​​the electrode of 0.05 mg / cm² 2 Exceeding 5 mg / cm² 2 Less than, or 0.1 mg / cm² 2 0 to 5 mg / cm² 2 It may be less than.

[0074]

[0075] The second layer containing the active metal has a loading amount per area of ​​the electrode of 0.05 mg / cm² 2 Exceeding 5 mg / cm² 2 Less than, or 0.1 mg / cm² 2 0 to 5 mg / cm² 2 It may be less than.

[0076]

[0077] Formation stage of the first layer

[0078] One embodiment may include the step of forming the first layer by coating a carbon-based material dispersion onto a release film, a polymer electrolyte membrane, or a membrane-electrode assembly. The coating method may be bar coating, spray coating, etc.

[0079] A release film, a polymer electrolyte membrane, or a membrane-electrode assembly may be attached to one side of the first layer formed accordingly, and the second layer may be formed on the other side thereof.

[0080] When the first layer is formed on the release film, the release film attached to one surface of the first layer can be removed after the final step.

[0081]

[0082] Formation stage of the second layer

[0083] One embodiment may include the step of forming a second layer containing an active metal by spray-coating an active metal solution onto a first layer containing a carbon-based material.

[0084]

[0085] The above spray coating method allows for coating even at very low viscosities and offers the advantage of shortened process steps because it dries immediately after coating. Furthermore, by utilizing a method of applying small particles, the spray coating method is advantageous for pore formation compared to other coating methods, which is beneficial for gas permeability and water discharge in fuel cell reactions. Additionally, using the spray coating method facilitates easy modification of the electrode structure.

[0086] For the above spray coating, a spray gun containing a carbon-based material dispersion (first layer forming solution) or an active metal solution (second layer forming solution) may be used.

[0087]

[0088] In the total amount of 100 weight% of the active metal solution, the content of the active metal may be 1 to 40 weight%. For example, in a commercially available stock solution, the content of the active metal in the total amount of 100 weight% of the active metal solution (stock solution) may be 10 to 40 weight%, 12 to 35 weight%, or 14 to 30 weight%.

[0089] In one embodiment, the commercially available stock solution itself may be used, but a diluted solution to which a solvent has been added may be used. For example, the content of the active metal in 100 weight% of the total amount of the active metal solution (diluted solution) may be 1 to 11 weight%, 3 to 10 weight%, or 5 to 10 weight%.

[0090]

[0091] The formation of the second layer above can be performed on a plate.

[0092] When using a first layer having the above-mentioned release film, polymer electrolyte membrane, or membrane-electrode assembly attached to one side, the side having the above-mentioned release film, polymer electrolyte membrane, or membrane-electrode assembly attached is placed on the plate, and the second layer can be formed on the other side of the first layer.

[0093] The above plate may be heated to a temperature range of 50 to 200°C.

[0094]

[0095] drying stage

[0096] One embodiment may include the step of horizontally placing and drying a laminate having the second layer formed thereon on the first layer after the second layer is formed.

[0097]

[0098] Repeat of formation and drying of the second layer

[0099] In one embodiment, after the drying step, a cycle can be sequentially repeated in which drying after the formation of a second layer by the spray coating is performed as one cycle.

[0100] The above cycle may be terminated after the completion of the cycle when the loading amount of the second layer reaches a target value after drying is completed following the formation of the second layer by the spray coating; or when the loading amount of the second layer, estimated from the coating amount immediately after the formation of the second layer by the spray coating, reaches a target value.

[0101]

[0102] (Method for manufacturing a membrane-electrode assembly)

[0103] In other embodiments, a method for manufacturing a membrane-electrode assembly is provided, comprising a method for manufacturing the electrode for the fuel cell.

[0104]

[0105] One embodiment provides a method for manufacturing a membrane-electrode assembly for a fuel cell, comprising the steps of: spray-coating an active metal solution onto a first layer comprising a carbon-based material to form a second layer comprising an active metal on the first layer; and transferring a laminate having the second layer formed on the first layer onto a polymer electrolyte membrane.

[0106]

[0107] The step of forming a second layer containing an active metal on the first layer is the same as described above, and the transfer step follows common knowledge generally known in the art. Accordingly, a detailed explanation is omitted.

[0108]

[0109] Specific embodiments of the invention are presented below. However, the embodiments described below are merely for the purpose of specifically illustrating or explaining the invention and should not limit the scope of the invention.

[0110]

[0111] Comparative example

[0112] FIG. 3 is a diagram briefly illustrating the membrane-electrode assembly of Comparative Example 1 and the reaction within a fuel cell containing the same.

[0113]

[0114] (1) Preparation of Pt / C catalyst

[0115] A carbon black dispersion is prepared by wet grinding a dispersion in which carbon black is dispersed in a solvent as a carbon-based material.

[0116] Independently of this, a platinum solution is prepared.

[0117] The platinum solution is added to the carbon black dispersion, the pH is adjusted, and then dried to obtain a Pt / C catalyst.

[0118]

[0119] (2) Manufacturing of the electrode (cathode)

[0120] The above Pt / C catalyst, ionomer, and solvent are mixed to prepare an electrode ink.

[0121] After coating the above electrode ink onto a release film, it is dried in an oven. The material layer dried on the release film can be used as an electrode (cathode).

[0122]

[0123] (3) Preparation of membrane-electrode assembly

[0124] The above electrode (cathode) is transferred onto the membrane of a separately prepared membrane-electrode (anode) assembly.

[0125] According to Comparative Example 1, it takes at least 4 days to manufacture the final membrane-electrode assembly.

[0126]

[0127] Example 1

[0128] FIG. 4 is a diagram briefly illustrating the membrane-electrode assembly of Example 1 and the reaction in a fuel cell containing the same.

[0129]

[0130] (1) Manufacturing of the electrode (cathode)

[0131] Carbon black is obtained by wet grinding carbon black dispersed in a solvent as a carbon-based material and then drying it. A carbon black dispersion in which an ion conductor and a solvent are mixed with the carbon black is coated onto a release film and then dried. The material layer dried on the release film can be referred to as the first layer (carbon layer).

[0132] A laminate of the release film and the first layer (carbon layer) is fixed on a plate heated to a temperature range of 100 to 150 ℃. At this time, the release film of the laminate is brought into contact with the plate.

[0133]

[0134] Independently, a platinum solution is prepared. In the total amount of 100% by weight of the platinum solution, the platinum content may be 10 to 40% by weight (original solution) or 1 to 10% by weight (diluted solution). The platinum solution is sprayed onto a first layer (carbon layer) of a laminate fixed on the plate and then dried to form a second layer (platinum layer) on the first layer (carbon layer). The release film / first layer (carbon layer) / second layer (platinum layer) sequentially laminated on the plate may be referred to as an electrode (cathode).

[0135] From the weight of the coated or dried electrode (cathode), it is measured whether the loading amount of the second layer (active metal layer) has reached a target value. If the target value has not been reached, a cycle in which the drying after the formation of the second layer by the spray coating is performed as one cycle is repeated sequentially, and when the target value is reached, the repetition of the cycle is terminated.

[0136]

[0137] (2) Preparation of membrane-electrode assembly

[0138] With the first layer (carbon layer) and the second layer (platinum layer) sequentially laminated on the above-mentioned release film, they are transferred onto a polymer electrolyte membrane of a separately prepared membrane-anode assembly. Through this, a laminate having a [first layer (carbon layer) / second layer (platinum layer)](cathode) / polymer electrolyte membrane / anode structure is obtained.

[0139] Example 1 takes at least 1 day to manufacture the final membrane-electrode assembly.

[0140]

[0141] Example 2

[0142] FIG. 5 is a diagram briefly illustrating the membrane-electrode assembly of Example 2 and the reaction within a fuel cell containing the same.

[0143]

[0144] Manufacture of electrode (cathode) and membrane-electrode assembly

[0145] Carbon black is obtained by wet grinding carbon black dispersed in a solvent and then drying it. The carbon black is coated onto a carbon black release film in which an ion conductor and a solvent are mixed, and then dried. The dried material layer on the release film can be referred to as the first layer (carbon layer).

[0146] The first layer (carbon layer) is transferred onto the membrane of a separately prepared membrane-electrode (anode) assembly. The laminate of the polymer electrolyte membrane and the first layer (carbon layer) is fixed on a plate heated to a temperature range of 100 to 150°C. At this time, the polymer electrolyte membrane of the laminate is brought into contact with the plate.

[0147]

[0148] Independently, a platinum solution is prepared. In the total amount of 100% by weight of the platinum solution, the platinum content may be 10 to 40% by weight (stock solution) or 1 to 10% by weight (diluted solution).

[0149]

[0150] After spraying the platinum solution onto the (carbon layer) of the laminate fixed on the plate and drying it, a second layer (platinum layer) is formed on the first layer (carbon layer). The electrode (anode) / polymer electrolyte membrane / [first layer (carbon layer) / second layer (platinum layer)](cathode) sequentially stacked on the plate can be considered as a membrane-electrode assembly of the final desired structure.

[0151] From the weight of the coated or dried electrode (cathode), it is measured whether the loading amount of the second layer (active metal layer) has reached a target value. If the target value has not been reached, a cycle in which the drying after the formation of the second layer by the spray coating is performed as one cycle is repeated sequentially, and when the target value is reached, the repetition of the cycle is terminated.

[0152] Example 2 takes at least 1 day to manufacture the final membrane-electrode assembly.

[0153]

[0154] Example 3

[0155] FIG. 6 is a diagram briefly illustrating the membrane-electrode assembly of Example 3 and the reaction within a fuel cell containing the same.

[0156]

[0157] (1) Preparation of the electrode (anode)

[0158] Carbon black is obtained by wet grinding carbon black dispersed in a solvent and then drying it. A carbon black dispersion, in which an ion conductor and a solvent are mixed with the carbon black, is coated onto a release film and then dried. The material layer dried on the release film can be referred to as the first layer (carbon layer).

[0159] A laminate of the release film and the first layer (carbon layer) is fixed on a plate heated to a temperature range of 100 to 150 ℃. At this time, the release film of the laminate is brought into contact with the plate.

[0160]

[0161] Independently, a platinum solution is prepared. In the total amount of 100% by weight of the platinum solution, the platinum content may be 10 to 40% by weight (original solution) or 1 to 10% by weight (diluted solution). The platinum solution is sprayed onto a first layer (carbon layer) of a laminate fixed on the plate and then dried to form a second layer (platinum layer) on the first layer (carbon layer). The release film / first layer (carbon layer) / second layer (platinum layer) sequentially laminated on the plate may be referred to as an electrode (anode).

[0162] From the weight of the coated or dried electrode (anode), the loading amount of the second layer (active metal layer) is measured to see if it has reached a target value. If it has not reached a target value, a cycle of forming the second layer by spray coating and drying it as one cycle is repeated sequentially, and when the target value is reached, the repetition of the cycle is terminated.

[0163]

[0164] (2) Preparation of membrane-electrode assembly

[0165] With the first layer (carbon layer) and the second layer (platinum layer) sequentially laminated on the above-mentioned release film, they are transferred onto a polymer electrolyte membrane of a separately prepared membrane-cathode assembly. Through this, a laminate with a [first layer (carbon layer) / second layer (platinum layer)](anode) / polymer electrolyte membrane / cathode structure is obtained.

[0166] Example 3 takes at least 1 day to manufacture the final membrane-electrode assembly.

[0167]

[0168] Example 4

[0169] FIG. 7 is a diagram briefly illustrating the membrane-electrode assembly of Example 4 and the reaction in a fuel cell containing the same.

[0170]

[0171] Fabrication of electrode (anode) and membrane-electrode assembly

[0172] Carbon black is obtained by wet grinding carbon black dispersed in a solvent as a carbon-based material and then drying it. A carbon black dispersion in which an ion conductor and a solvent are mixed with the carbon black is coated onto a release film and then dried. The material layer dried on the release film can be referred to as the first layer (carbon layer).

[0173] The first layer (carbon layer) is transferred onto the membrane of a separately prepared membrane-electrode (cathode) assembly. The laminate of the polymer electrolyte membrane and the first layer (carbon layer) is fixed on a plate heated to a temperature range of 100 to 150°C. At this time, the cathode side of the laminate is brought into contact with the plate.

[0174]

[0175] Independently, a platinum solution is prepared. In the total amount of 100% by weight of the platinum solution, the platinum content may be 10 to 40% by weight (stock solution) or 1 to 10% by weight (diluted solution).

[0176]

[0177] After spraying the platinum solution onto the (carbon layer) of the laminate fixed on the plate and drying it, a second layer (platinum layer) is formed on the first layer (carbon layer). The electrode (cathode) / polymer electrolyte membrane / [first layer (carbon layer) / second layer (platinum layer)](anode) sequentially stacked on the plate can be considered as a membrane-electrode assembly of the final desired structure.

[0178] From the weight of the coated or dried electrode (anode), the loading amount of the second layer (active metal layer) is measured to see if it has reached a target value. If it has not reached a target value, a cycle of forming the second layer by spray coating and drying it as one cycle is repeated sequentially, and when the target value is reached, the repetition of the cycle is terminated.

[0179] Example 4 takes at least 1 day to manufacture the final membrane-electrode assembly.

[0180]

[0181] Example 5

[0182] FIG. 8 is a diagram briefly illustrating the membrane-electrode assembly of Example 5 and the reaction in a fuel cell containing the same.

[0183] By combining the cathode of Example 2 and the anode of Example 3, a laminate with a structure of [first layer (carbon layer) / second layer (platinum layer)](anode) / film / [first layer (carbon layer) / (second layer (platinum layer)](cathode) is manufactured.

[0184] Example 5 takes at least 1 day to manufacture the final membrane-electrode assembly.

[0185]

[0186] Example 6

[0187] FIG. 9 is a diagram briefly illustrating the membrane-electrode assembly of Example 6 and the reaction in a fuel cell containing the same.

[0188]

[0189] By combining the cathode of Example 2 and the anode of Example 4, a laminate with a structure of [second layer (platinum layer) / first layer (carbon layer)](anode) / film / [first layer (carbon layer) / second layer (platinum layer)](cathode) is manufactured.

[0190] Example 6 takes at least 1 day to manufacture the final membrane-electrode assembly.

[0191]

[0192] Example 7

[0193] FIG. 10 is a diagram briefly illustrating the membrane-electrode assembly of Example 7 and the reaction in a fuel cell containing the same.

[0194]

[0195] By combining the cathode of Example 1 and the anode of Example 3, a laminate with a structure of [first layer (carbon layer) / second layer (platinum layer)](anode) / film / [second layer (platinum layer) / first layer (carbon layer)](cathode) is manufactured.

[0196] Example 7 takes at least 1 day to manufacture the final membrane-electrode assembly.

[0197]

[0198] Example 8

[0199] FIG. 11 is a diagram briefly illustrating the membrane-electrode assembly of Example 8 and the reaction in a fuel cell containing the same.

[0200]

[0201] By combining the cathode of Example 1 and the anode of Example 4, a laminate with a structure of [second layer (platinum layer) / first layer (carbon layer)](anode) / film / [second layer (platinum layer) / first layer (carbon layer)](cathode) is manufactured.

[0202] Example 8 takes at least 1 day to manufacture the final membrane-electrode assembly.

[0203]

[0204] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

Claims

1. A step comprising spray-coating an active metal solution onto a first layer comprising a carbon-based material to form a second layer comprising an active metal. Method for manufacturing an electrode for a fuel cell.

2. In Paragraph 1, The above active metal is Precious metals including platinum, palladium, iridium, ruthenium, and silver; Non-precious metals including nickel, cobalt, and iron; or including a combination of these, Method for manufacturing an electrode for a fuel cell.

3. In Paragraph 1, The first layer and the second layer each independently further comprise an ion conductor, Method for manufacturing an electrode for a fuel cell.

4. In Paragraph 1, The method further comprises the step of forming the first layer by coating a carbon-based material dispersion onto a release film, a polymer electrolyte membrane, or a membrane-electrode assembly prior to the formation of the second layer. Method for manufacturing an electrode for a fuel cell.

5. In Paragraph 4, The formation of the second layer is performed on a plate, and One side to which the above-mentioned release film, polymer electrolyte membrane, or membrane-electrode assembly is attached is placed on the plate, and the second layer is formed on the other side of the first layer. Method for manufacturing an electrode for a fuel cell.

6. In Paragraph 5, The temperature of the above plate is 50 to 200℃, Method for manufacturing an electrode for a fuel cell.

7. In Paragraph 1, In the total amount of the active metal solution of 100 weight%, the content of the active metal is 1 to 40 weight%, Method for manufacturing an electrode for a fuel cell.

8. In Paragraph 1, After the formation of the above second layer, A further step of drying a laminate in which a second layer is formed on the first layer, Method for manufacturing an electrode for a fuel cell.

9. In Paragraph 8, After the above drying, One cycle is performed by sequentially proceeding with drying after the formation of the second layer by the above spray coating, Repeating the above cycle, Method for manufacturing an electrode for a fuel cell.

10. In the 79th, The conclusion of the above cycle is, After the formation of the second layer by the spray coating and subsequent drying, the loading amount of the second layer reaches a target value; or When the loading amount of the second layer, estimated from the coating amount immediately after the formation of the second layer by the spray coating, reaches the target value, Terminating after the completion of the corresponding cycle, Method for manufacturing an electrode for a fuel cell.

11. A step of forming a second layer containing an active metal by spray-coating an active metal solution onto a first layer containing a carbon-based material; and A step comprising transferring a laminate having a second layer formed on the first layer onto a polymer electrolyte membrane. Method for manufacturing a membrane-electrode assembly for a fuel cell.

12. In Paragraph 1, The method further comprises the step of forming the first layer by coating a carbon-based material dispersion onto a release film, a polymer electrolyte membrane, or a membrane-electrode assembly prior to the formation of the second layer. Method for manufacturing a membrane-electrode assembly for a fuel cell.

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