Apparatus and method for manufacturing electrode for water electrolysis

Abstract

To provide a manufacturing apparatus which is advantageous from the viewpoint of manufacturing an electrode for water electrolysis having less variation in electrode performance than before.SOLUTION: Device 1a includes vessel 10, circulation path 20, and circulator 30. The vessel 10 has an inlet 11 and an outlet 12 for the L1 of the stock solution for forming a layer of water electrocatalyst on the conductive substrate S. The first container 10 is configured such that the conductive substrate S can be disposed therein. The circulation path 20 connects the inlet 11 and the outlet 12. Circulator 30 is provided in circulation path 20, and can circulate L1 via vessel 10. The production device 1a is configured to separate the material liquid L1 and the solid P in at least one selected from the group consisting of the vessel 10 and the circulation path 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an apparatus for manufacturing electrodes for water electrolysis and a method for manufacturing electrodes for water electrolysis. [Background technology]

[0002] Conventionally, there has been known an apparatus for treating slurry waste liquid.

[0003] For example, Patent Document 1 describes an inorganic raw material waste liquid treatment device. This treatment device is equipped with a concentration storage tank section, a raw material supply storage tank section, and a solid-liquid separator section. The concentration storage tank section, during the regeneration treatment of inorganic raw material slurry waste liquid, concentrates the inorganic raw material slurry waste liquid along a path from an inlet to an outlet. The raw material supply storage tank section supplies the concentrated waste liquid supplied from the concentration storage tank section to the solid-liquid separator section. The solid-liquid separator section is composed of a vacuum cylindrical porous fine-pore resin filter that separates the inorganic raw material slurry waste liquid supplied from the raw material supply storage tank section into solids and a solution. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3064615 Summary of the Invention [Problem to be solved by the invention]

[0005] The techniques described in the above patent documents need to be reconsidered from the viewpoint of producing water electrolysis electrodes with less variation in electrode performance than conventional ones. Therefore, the present disclosure provides an apparatus for producing water electrolysis electrodes with less variation in electrode performance than conventional ones, which is advantageous from the viewpoint of producing water electrolysis electrodes with less variation in electrode performance than conventional ones. [Means for solving the problem]

[0006] The present disclosure provides: a first container having an inlet and an outlet for a raw material solution for forming a water electrolysis catalyst layer on a conductive substrate, the first container having the conductive substrate disposed therein; a circulation path connecting the inlet and the outlet; a circulator provided in the circulation path for circulating the raw material solution through the first container, the raw material solution and the solid matter containing the water electrolysis catalyst particles are separated in at least one selected from the group consisting of the first container and the circulation path. A manufacturing device for electrodes for water electrolysis is provided. [Effects of the Invention]

[0007] The manufacturing apparatus for electrodes for water electrolysis according to the present disclosure is advantageous from the viewpoint of manufacturing electrodes for water electrolysis with less variation in electrode performance than conventional ones. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram schematically illustrating an example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. [Figure 2] FIG. 2 is a flowchart showing an example of a method for producing a water electrolysis electrode according to an embodiment. [Figure 3] FIG. 3 is a diagram schematically illustrating another example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. [Figure 4] FIG. 4 is a diagram schematically illustrating yet another example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. [Figure 5] FIG. 5 is a diagram schematically illustrating yet another example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. [Figure 6] FIG. 6 is a diagram schematically illustrating yet another example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. [Figure 7] FIG. 7 is a diagram schematically illustrating yet another example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. [Figure 8] FIG. 8 is a graph showing an example of the number-based particle size distribution of solid particles generated in the production of electrodes for water electrolysis. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Findings that formed the basis of this disclosure) In recent years, hydrogen has been attracting attention as a clean alternative energy source to fossil fuels due to environmental issues such as global warming and energy issues such as the depletion of oil resources. When hydrogen is burned, it basically only produces water. As a result, it does not emit carbon dioxide, which causes global warming, nor nitrogen oxides. For this reason, hydrogen is expected to be a clean energy source. Furthermore, there is a demand for green hydrogen, which is produced by electrolysis of water, rather than gray hydrogen, which is produced using fossil fuels as a raw material.

[0010] Fuel cells are an example of a device that uses hydrogen as a fuel with high efficiency. Fuel cells are being developed and widely used for automotive power sources and home power generation. In the coming hydrogen society, it is expected that hydrogen production will be able to produce clean hydrogen at low cost in order to ensure a stable supply.

[0011] Therefore, it is desirable to increase the amount of hydrogen produced per water electrolysis electrode. For example, in order to manufacture highly active water electrolysis electrodes, a process has been investigated in which a substrate is immersed in a raw material solution to directly form a highly active water electrocatalyst layer on the surface of the substrate. If such a layer could be uniformly formed on the substrate, the variation in electrode performance of water electrolysis electrodes would be reduced compared to conventional methods, and the performance of the water electrolysis electrode could be improved. According to the studies of the present inventors, in order to uniformly form a water electrocatalyst layer on the substrate, it is considered desirable for the substrate to be immersed in the raw material solution while the raw material solution is flowing around the substrate. Meanwhile, it has been newly discovered that when a water electrocatalyst layer is formed on a substrate, solid matter containing water electrocatalyst particles originating from the raw material solution is generated, and this solid matter may adhere to the substrate and prevent the water electrocatalyst layer from being directly formed on the substrate.

[0012] Taking these circumstances into consideration, the inventors conducted further research and found that by eliminating the mixed state of the raw material solution and the solid matter, the solid matter is less likely to adhere to the substrate. This is expected to facilitate the formation of a uniform water electrolysis catalyst layer on the substrate, enabling the production of water electrolysis electrodes with less variation in electrode performance than conventional methods. Based on this new finding, the inventors have completed the apparatus for producing water electrolysis electrodes as disclosed herein.

[0013] (Embodiments of the present disclosure) Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. The embodiments described below are all comprehensive or specific examples. Therefore, the numerical values, shapes, materials, components, and the arrangement and connection of the components shown below are merely examples and do not limit the present disclosure unless otherwise stated in the claims. Furthermore, among the components below, components that are not described in the independent claims that represent the highest concept of this aspect will be described as optional components. Furthermore, in the drawings, descriptions of components with the same reference numerals may be omitted. To facilitate understanding of the drawings, each component is shown schematically, and the shapes, dimensional ratios, etc. may not be accurately represented.

[0014] (First embodiment) FIG. 1 is a schematic diagram illustrating an example of an apparatus for manufacturing water electrolysis electrodes according to an embodiment. As shown in FIG. 1, the manufacturing apparatus 1a includes a first container 10, a circulation path 20, and a circulator 30. The first container 10 has an inlet 11 and an outlet 12 for a raw material solution L1 for forming a water electrolysis catalyst layer on a conductive substrate S. The first container 10 is configured so that the conductive substrate S can be disposed therein. The circulation path 20 connects the inlet 11 and the outlet 12. The circulator 30 is provided on the circulation path 20 and can circulate the raw material solution L1 through the first container 10. The circulator 30 is, for example, a pump. For example, when the circulator 30 is operated, the raw material solution L1 is delivered from the circulator 30 and supplied to the first container 10 through the circulation path 20 and the inlet 11. In addition, a flow of the raw material solution L1 occurs in the first container 10 from the inlet 11 to the outlet 12. The raw material solution L1 discharged from the first container 10 through the outlet 12 returns to the circulator 30 through the circulation path 20. In this way, the production apparatus 1a can generate a flow of the raw material solution L1 in the first container 10.

[0015] In the first container 10, a solid matter P may be generated from the raw material solution L1. The solid matter P contains particles of the water electrocatalyst. If this solid matter P adheres to the conductive substrate S, it may prevent a water electrocatalyst layer from being directly formed on the surface of the conductive substrate S, which may result in variation in electrode performance. On the other hand, the production apparatus 1a is configured to separate the raw material solution L1 and the solid matter P in at least one selected from the group consisting of the first container 10 and the circulation path 20. Therefore, the production apparatus 1a is less likely to produce water electrolysis electrodes with less variation in electrode performance than when the production apparatus 1a is not configured to separate the raw material solution L1 and the solid matter P.

[0016] Fig. 2 is a flowchart showing an example of a method for manufacturing an electrode for water electrolysis according to an embodiment. As shown in Fig. 2, this manufacturing method includes the following items (I), (II), and (III). This manufacturing method is carried out using, for example, the manufacturing apparatus 1a described above. (I) A raw material solution L1 for forming a layer of a water electrolysis catalyst on a conductive substrate S disposed inside the first container 10 is circulated through the first container 10. (II) A layer of a water electrolysis catalyst is formed on the conductive substrate S. (III) In at least one selected from the group consisting of the first container 10 and the circulation path 20, the raw material solution L1 and the solid matter P are separated.

[0017] In step S101, the conductive substrate S is disposed inside the first container 10. Next, in step S102, for example, the circulator 30 is operated to start circulating the raw material solution L1 through the first container 10. This causes the raw material solution L1 to flow from the inlet 11 to the outlet 12 in the first container 10. For example, the raw material solution L1 may flow so that the conductive substrate S is immersed in the raw material solution L1. Therefore, in step S103, a water electrolysis catalyst layer is formed on the conductive substrate S by reaction of the components contained in the raw material solution L1. Meanwhile, the reaction of the components contained in the raw material solution L1 may also occur at a location distant from the conductive substrate S. This may result in the production of a solid P derived from the raw material solution L1, as described above. In step S103, in addition to forming a water electrolysis catalyst layer on the conductive substrate S, the raw material solution L1 and the solid P are separated.

[0018] In step S104, it is determined whether the formation of the water electrocatalyst layer has been completed. Step S103 is repeated until the determination result of step S104 is affirmative. For example, the determination of step S104 is made based on predetermined data. Examples of the predetermined data include image data and optical measurement data of the water electrocatalyst layer formed on the conductive substrate S. The determination of whether the formation of the water electrocatalyst layer has been completed may also be made based on data indicating the state of the raw material solution L1. Examples of the data indicating the state of the raw material solution L1 include concentration data and optical measurement data of a specific component. Alternatively, the determination of step S104 may be affirmative based on the elapse of a predetermined time since the start of circulation of the raw material solution L1.

[0019] If the determination in step S104 is affirmative, the process proceeds to step S105, where the circulation of the raw material solution L1 is stopped. For example, the circulator 30 is stopped. Next, the process proceeds to step S106, where the water electrolysis electrodes are removed from the first container 10. In this manner, the water electrolysis electrodes are manufactured. The manufacturing apparatus 1a may include a controller (not shown), such as a programmable logic controller (PLC), to assist in the execution of each of the above steps.

[0020] The conductive substrate S is not limited to a specific conductive substrate as long as it allows the production of an electrode for water electrolysis. The conductive substrate S may contain, for example, a specific metal or a resin. The entire conductive substrate S may be made of metal. The conductive substrate S may have a configuration in which a metal-containing surface layer is formed on a resin member such as polypropylene or polyethylene. In this case, the metal-containing surface layer may be a plated film or a sputtered film. The metal contained in the conductive substrate S may be a pure metal such as nickel, or an alloy such as stainless steel or Inconel. Inconel is a registered trademark.

[0021] The surface of the conductive substrate S preferably contains at least one selected from the group consisting of nickel and nickel oxide. In this case, the conductive substrate S is likely to have high alkali resistance. When the surface of the conductive substrate S contains at least one selected from the group consisting of nickel and nickel oxide, the entire conductive substrate S may be made of nickel. The conductive substrate S may have a surface layer containing at least one selected from the group consisting of nickel and nickel oxide. The surface layer is, for example, a sputtered film or a plated film.

[0022] The shape of the conductive substrate S is not limited to a specific shape. The conductive substrate S is, for example, plate-shaped. The conductive substrate S may have a non-porous structure or a porous structure such as a mesh, a foam, or a nonwoven fabric. The conductive substrate S preferably has a porous structure. In this case, the surface area of ​​the conductive portion of the conductive substrate S tends to be large, and the water electrolysis electrode tends to have high electrode activity.

[0023] The thickness of the conductive substrate S is not limited to a specific value. The thickness of the conductive substrate S is, for example, 0.02 mm or more. In this case, the conductive substrate S tends to be easy to handle. The thickness of the conductive substrate S is, for example, 10 mm or less.

[0024] The raw material solution L1 is not limited to a specific solution as long as it can be used to produce a water electrolysis electrode. The raw material solution L1 is, for example, a solution capable of forming a hydroxide-containing layer on the conductive substrate S. In this case, the water electrolysis catalyst contains this hydroxide. The raw material solution L1 may also be a solution capable of forming a layer containing layered double hydroxide (LDH) on the conductive substrate S. In this case, the water electrolysis catalyst contains LDH, which facilitates the production of a water electrolysis electrode exhibiting high catalytic activity. In this case, the solid material P contains, for example, LDH particles. The LDH particles in the solid material P are not limited to primary particles but may also be secondary particles. The LDH is preferably an LDH containing iron and nickel. In this case, a water electrolysis electrode exhibiting high catalytic activity is easily obtained. For example, the raw material solution L1 may be prepared by adding iron(III) chloride and nickel(II) chloride to a predetermined solvent such as water, and optionally adding a chelating agent such as acetylacetone (ACAC). A pH-increasing agent may be added to the raw material solution L1. An example of the pH-elevating agent is propylene oxide (POX). The pH-elevating agent may be added to the raw material solution L1 during the production of the water electrolysis electrode. For example, after circulating the raw material solution L1 containing the chelating agent, iron (III) chloride, and nickel (II) chloride, the pH-elevating agent may be added to the raw material solution L1, and the circulation of the raw material solution L1 may be further continued.

[0025] In the manufacturing apparatus 1a, the configuration for separating the raw material solution L1 from the solid matter P is not limited to a specific configuration. This configuration separates the raw material solution L1 from the solid matter P by, for example, sedimentation, filtration, or centrifugation. The manufacturing apparatus 1a may be configured to separate the raw material solution L1 from the water electrocatalyst particles.

[0026] For example, at least one selected from the group consisting of the first container 10 and the circulation path 20 has a structure 40 that separates the raw material solution L1 and the solid matter P. With this configuration, the structure 40 can separate the raw material solution L1 and the solid matter P. The structure 40 may also separate the raw material solution L1 and the water electrolysis catalyst particles.

[0027] The structure 40 is not limited to a specific structure as long as it can separate the raw material solution L1 and the solid matter P. The structure 40 has, for example, a recess 42 that captures the solid matter P. For example, the solid matter P drifting with the flow of the raw material solution L1 is deposited in the recess 42 by gravitational settling, and the solid matter P is captured by the recess 42. Particles of a water electrocatalyst may also be captured by the recess 42.

[0028] 1, in the manufacturing apparatus 1a, for example, a structure 40 including a recess 42 is disposed in the bottom of the first container 10. In this case, the solid matter P can be captured in the first container 10. In addition, it is easy to increase the space for capturing the solid matter P, and a relatively large amount of the solid matter P can be captured.

[0029] Figure 3 is a schematic diagram illustrating another example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. The manufacturing apparatus 1b shown in Figure 3 has the same configuration as the manufacturing apparatus 1a, except for parts that will be particularly described. Components of the manufacturing apparatus 1b that are the same as or correspond to those of the manufacturing apparatus 1a are designated by the same reference numerals, and detailed description thereof will be omitted. The description of the manufacturing apparatus 1a also applies to the manufacturing apparatus 1b, unless technically inconsistent.

[0030] As shown in FIG. 3 , in the production apparatus 1b, a structure 40 including a recess 42 is disposed in the bottom of the first container 10. The structure 40 includes, for example, a portion that narrows toward the bottom of the first container 10. With this configuration, for example, a large amount of solid matter P collects in the recess 42 by gravitational settling, facilitating efficient deposition of the solid matter P. This promotes separation of the raw material solution L1 from the solid matter P. For example, a discharge outlet 13 is provided in the bottom of the first container 10, allowing the raw material solution L1 to be recovered from the discharge outlet 13. The raw material solution L1 can be recovered, for example, when the water electrolysis electrodes are removed from the first container 10 in step S106.

[0031] Fig. 4 is a schematic diagram illustrating yet another example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. The manufacturing apparatus 1c shown in Fig. 4 has the same configuration as the manufacturing apparatus 1a, except for parts that will be particularly described. Components of the manufacturing apparatus 1c that are the same as or correspond to those of the manufacturing apparatus 1a are designated by the same reference numerals, and detailed description thereof will be omitted. The description of the manufacturing apparatus 1a also applies to the manufacturing apparatus 1c, unless technically inconsistent.

[0032] 4, in the manufacturing apparatus 1c, the circulation path 20 has a structure 40 including a recess 42. For example, the structure 40 is disposed between the outlet 12 of the circulation path 20 and the inlet of the circulator 30. As the raw material solution L1 that has passed through the outlet 12 flows along the recess 42, the solid matter P that drifts with the flow of the raw material solution L1 is deposited in the recess 42 by gravitational settling, and the solid matter P is captured by the recess 42.

[0033] According to the manufacturing apparatus 1c, the solid material P captured in the recessed portion 42 can be easily collected, and the maintenance of the manufacturing apparatus 1c tends to be easy.

[0034] (Second embodiment) Figure 5 is a schematic diagram illustrating yet another example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. The manufacturing apparatus 1d shown in Figure 5 has the same configuration as the manufacturing apparatus 1a, except for parts that will be particularly described. Components of the manufacturing apparatus 1d that are the same as or correspond to those of the manufacturing apparatus 1a are designated by the same reference numerals, and detailed description thereof will be omitted. The description of the manufacturing apparatus 1a also applies to the manufacturing apparatus 1d, unless technically inconsistent.

[0035] 5, in the production apparatus 1d, for example, a structure 50 that separates the raw material solution L1 and the solid matter P is provided in at least one selected from the group consisting of the first container 10 and the circulation path 20. With this configuration, the raw material solution L1 and the solid matter P can be separated by the structure 50. The structure 50 may also separate the raw material solution L1 and the water electrocatalyst particles.

[0036] The structure 50 is not limited to a specific structure as long as it can separate the raw material solution L1 and the solid matter P. The structure 50 includes, for example, a second container 52 that captures the solid matter P. As shown in FIG. 5 , in the production apparatus 1d, the second container 52 is provided, for example, in the circulation path 20. The interior of the second container 52 can function as part of the circulation path 20. The second container 52 may be provided in the first container 10. In other words, the second container 52 may be disposed inside the first container 10. The water electrocatalyst particles may be captured by the second container 52.

[0037] The second container 52 is disposed, for example, between the outlet 12 of the circulation path 20 and the inlet of the circulator 30. The raw solution L1 that has passed through the outlet 12 is introduced into the second container 52. As a result, the solids P that drift with the flow of the raw solution L1 are also introduced into the second container 52. The solids P are deposited at the bottom of the second container 52 by gravitational settling. Meanwhile, the raw solution L1 leaves the second container 52 and flows toward the inlet of the circulator 30. In this case, even if the solids P are relatively large, it is easy to separate the solids P efficiently.

[0038] 5, the second container 52 has, for example, an inlet 52a. The raw material solution L1 is introduced into the second container 52 through the inlet 52a. The inlet 52a is provided, for example, at the top of the second container 52. In this case, the solid matter P is less likely to fly up inside the second container 52, and the solid matter P can be easily separated efficiently. The inlet 52a is located, for example, above a horizontal plane that divides the internal volume of the second container 52 in half.

[0039] Figure 6 is a schematic diagram illustrating yet another example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. The manufacturing apparatus 1e shown in Figure 6 has the same configuration as the manufacturing apparatus 1d, except for parts that will be particularly described. Components of the manufacturing apparatus 1e that are the same as or correspond to those of the manufacturing apparatus 1d are designated by the same reference numerals, and detailed description thereof will be omitted. The description of the manufacturing apparatus 1d also applies to the manufacturing apparatus 1e, unless there is a technical contradiction.

[0040] As shown in FIG. 6, in the manufacturing apparatus 1e, a second container 52 is provided in the circulation path 20. In the second container 52, an inlet 52a is provided, for example, in the lower part of the second container 52. In this case, the raw material solution L1 introduced into the second container 52 rises inside the second container 52 and overflows from the second container 52. As a result, the raw material solution L1 leaves the second container 52 and flows toward the inlet of the circulator 30. On the other hand, the solid matter P may fly up as the raw material solution L1 rises inside the second container 52, but may remain inside the second container 52 due to gravity acting on the solid matter P. Therefore, the solid matter P is captured by the second container 52, and the raw material solution L1 and the solid matter P can be separated.

[0041] (Third embodiment) Figure 7 is a schematic diagram showing yet another example of an apparatus for manufacturing electrodes for water electrolysis according to an embodiment. The manufacturing apparatus 1f shown in Figure 7 has the same configuration as the manufacturing apparatus 1a, except for parts that will be particularly described. Components of the manufacturing apparatus 1f that are the same as or correspond to those of the manufacturing apparatus 1a are designated by the same reference numerals, and detailed description thereof will be omitted. The descriptions of the manufacturing apparatuses 1a to 1e also apply to the manufacturing apparatus 1f, unless technically inconsistent.

[0042] 7, in the production apparatus 1f, for example, at least one selected from the group consisting of the first container 10 and the circulation path 20 is provided with a structure 50 that separates the raw material solution L1 and the solid matter P. In the production apparatus 1f, the structure 50 includes a filter 54. With this configuration, the raw material solution L1 and the solid matter P can be separated by filtration. The filter 54 may separate the raw material solution L1 from the water electrocatalyst particles.

[0043] As shown in FIG. 7 , a filter membrane 55 is disposed inside the filter 54. The size of the openings in the filter membrane 55 is smaller than the size of the solid matter P, for example, 1 mm. This prevents the solid matter P from passing through the filter membrane 55 when the raw material solution L1 passes through the filter membrane 55. The filter 54 is disposed, for example, in the circulation path 20, and the interior of the filter 54 forms part of the circulation path 20. The filter 54 is disposed, for example, between the outlet 12 in the circulation path 20 and the inlet of the circulator 30. The filter 54 may be disposed in the first container 10, and may be disposed, for example, in contact with the outlet 12.

[0044] The size of the solid material P can be determined, for example, by measuring its particle size distribution. The particle size distribution of the solid material P can be measured, for example, using a laser diffraction particle size distribution analyzer SALD-2300 manufactured by Shimadzu Corporation. FIG. 8 is a graph showing an example of the particle size distribution, based on the number, of the solid material P generated in the production of electrodes for water electrolysis. According to FIG. 8, the number of particles having a particle size greater than 5 μm is 24.4% of the total number of particles. For example, if the opening size of the filtration membrane 55 is 5 mm or less, the filter 54 is considered to be able to separate 24.4% or more of the particles by number. The number of particles having a particle size greater than 1 μm is 92.5% of the total number of particles. For example, if the opening size of the filtration membrane 55 is 1 μm or less, the filter 54 is considered to be able to separate 92.5% or more of the particles by number.

[0045] From the above description, many modifications and other embodiments of the present disclosure will be apparent to those skilled in the art. Therefore, the above description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode for carrying out the present disclosure. Details of the structure and / or function thereof can be substantially changed without departing from the spirit of the present disclosure.

[0046] (Addendum) From the above description, the following techniques are disclosed. (Technology 1) a first container having an inlet and an outlet for a raw material solution for forming a water electrolysis catalyst layer on a conductive substrate, the first container having the conductive substrate disposed therein; a circulation path connecting the inlet and the outlet; a circulator provided in the circulation path for circulating the raw material solution through the first container, the raw material solution and the solid matter containing the water electrolysis catalyst particles are separated in at least one selected from the group consisting of the first container and the circulation path. Water electrolysis electrode manufacturing equipment. (Technology 2) At least one selected from the group consisting of the first container and the circulation path has a structure that separates the raw material solution and the solid matter. The manufacturing apparatus for electrodes for water electrolysis according to the first aspect of the present invention. (Technology 3) the structure has a recess that captures the solid matter; The manufacturing apparatus for electrodes for water electrolysis according to the second aspect of the present invention. (Technology 4) a structure for separating the raw material solution from the solid matter is provided in at least one selected from the group consisting of the first container and the circulation path; 4. The apparatus for manufacturing an electrode for water electrolysis according to any one of claims 1 to 3. (Technology 5) The structure includes a second container that captures the solid matter and is provided in at least one selected from the group consisting of the first container and the circulation path. 10. The apparatus for manufacturing electrodes for water electrolysis according to claim 4. (Technology 6) The structure includes a filter. 10. The apparatus for manufacturing electrodes for water electrolysis according to claim 4 or 5. (Technology 7) the water electrolysis catalyst contains a layered double hydroxide, The solid material comprises layered double hydroxide particles. 7. The apparatus for manufacturing an electrode for water electrolysis according to any one of claims 1 to 6. (Technology 8) circulating a raw material solution for forming a water electrolysis catalyst layer on a conductive substrate disposed inside a first container through the first container; forming electrodes for water electrolysis on the conductive substrate; separating the raw material solution from a solid material containing particles of the water electrolysis catalyst in at least one selected from the group consisting of the first container and a circulation path for circulating the raw material solution via the first container. A method for manufacturing an electrode for water electrolysis. (Technology 9) the raw material solution and the solid matter are separated by a structure included in at least one selected from the group consisting of the first container and the circulation path. A method for producing an electrode for water electrolysis according to claim 8. (Technology 10) the raw material solution and the solid matter are separated by a structure provided in at least one selected from the group consisting of the first container and the circulation path. 10. A method for producing an electrode for water electrolysis according to claim 8 or 9. (Technology 11) the water electrolysis catalyst contains a layered double hydroxide, The solid material comprises layered double hydroxide particles. 11. A method for producing an electrode for water electrolysis according to any one of claims 8 to 10. [Industrial Applicability]

[0047] The manufacturing apparatus and manufacturing method of the present disclosure can be used to manufacture electrodes for water electrolysis. [Explanation of symbols]

[0048] 1a, 1b, 1c, 1d, 1e, 1f manufacturing equipment 10 First container 11 Entrance 12 Exit 20 Circulation path 30 Circulatory system 40 Structure 42 recess 50 structure 52 Second container 54 Filter L1 raw material solution P solids S Conductive base material

Claims

1. a first container having an inlet and an outlet for a raw material solution for forming a water electrolysis catalyst layer on a conductive substrate, the first container having the conductive substrate disposed therein; a circulation path connecting the inlet and the outlet; a circulator provided in the circulation path for circulating the raw material solution through the first container, the raw material solution and the solid matter containing the water electrolysis catalyst particles are separated in at least one selected from the group consisting of the first container and the circulation path. Water electrolysis electrode manufacturing equipment.

2. At least one selected from the group consisting of the first container and the circulation path has a structure that separates the raw material solution and the solid matter. An apparatus for manufacturing the electrode for water electrolysis according to claim 1.

3. the structure has a recess that captures the solid matter; The apparatus for manufacturing the electrode for water electrolysis according to claim 2.

4. a structure for separating the raw material solution from the solid matter is provided in at least one selected from the group consisting of the first container and the circulation path; An apparatus for manufacturing the electrode for water electrolysis according to claim 1.

5. The structure includes a second container provided in at least one selected from the group consisting of the first container and the circulation path, and configured to capture the solid matter. The apparatus for manufacturing the electrode for water electrolysis according to claim 4.

6. The structure includes a filter. The apparatus for manufacturing the electrode for water electrolysis according to claim 4.

7. the water electrolysis catalyst contains a layered double hydroxide, The solid material comprises layered double hydroxide particles. An apparatus for manufacturing the electrode for water electrolysis according to claim 1.

8. circulating a raw material solution for forming a water electrolysis catalyst layer on a conductive substrate disposed inside a first container through the first container; forming electrodes for water electrolysis on the conductive substrate; separating the raw material solution from a solid material containing particles of the water electrolysis catalyst in at least one selected from the group consisting of the first container and a circulation path for circulating the raw material solution via the first container. A method for manufacturing an electrode for water electrolysis.

9. the raw material solution and the solid matter are separated by a structure included in at least one selected from the group consisting of the first container and the circulation path. The method for producing the water electrolysis electrode according to claim 8.

10. the raw material solution and the solid matter are separated by a structure provided in at least one selected from the group consisting of the first container and the circulation path. The method for producing the water electrolysis electrode according to claim 8.

11. the water electrolysis catalyst contains a layered double hydroxide, The solid material comprises layered double hydroxide particles. The method for producing the water electrolysis electrode according to claim 8.

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