JP2015025174A - Porous conductive member for water electrolysis, and functional water generator using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a porous conductive member for water electrolysis which is obtained by using hydrophobic binder material having been considered unsuitable for water electrolysis, and nonetheless achieves improved electrolytic efficiency.SOLUTION: The porous conductive member for water electrolysis includes a porous conductor part 2 containing hydrophilized electrode active material 4 and binder material 5, and a collector part 3 which is abutted on or included in a surface of the porous conductor part. The binder material is composed of hydrophobic material. A functional water generator includes the porous conductive member for water electrolysis as an electrode performing absorption and desorption of metal ions in a diaphragmless electrolytic cell of one cell type.

Description

  The present invention is for water electrolysis comprising a porous conductor portion including a hydrophilized electrode active material and a binder material, and a current collector portion in contact with or included in the surface of the porous conductor portion. A porous electroconductive member for water electrolysis, wherein the binder material is composed of a hydrophobic material, and a one-tank membrane type using the electroconductive member for water electrolysis It is related with the functional water generator which produces | generates the functional water used for tableware washing | cleaning use, a hairdressing cosmetic use, a humidification use, or a drinking use by electrolyzing raw | natural water, such as a tap water, in an electrolysis tank.

  Conventionally, as an electrode material of an electric double layer capacitor, it is common to use activated carbon or the like as an electrode active material and to perform molding using a fluorine-based hydrophobic binder material. However, in electrolysis using tap water or the like as raw water, when a fluororesin binder material such as polytetrafluoroethylene is used as the hydrophobic binder material, the binder material has water repellency. There is a problem that the impregnation property is poor and predetermined electrical characteristics cannot be obtained in electrolysis or the like.

  In order to deal with this problem, a method using a hydrophilic binder material such as carboxymethyl cellulose and polyvinyl alcohol has been proposed (see, for example, Japanese Patent Laid-Open No. 60-171714 (Patent Document 1)). When such a hydrophilic binder material is used, since the binder material has hydrophilicity, the wettability of the adsorption electrode is good, and the impregnation property of the electrolytic solution into the electrode is improved, so that the electrode is relatively thick. Even so, the impregnation into the electrode was possible. Thus, by using the hydrophilic binder material, it was possible to improve the performance of the aqueous electrolyte in electrolysis or the like.

JP-A-60-171714

  However, when activated carbon is used as the electrode active material and a hydrophilic binder material is used, the affinity between the binder material and the activated carbon increases because both the binder material and the activated carbon are hydrophilic. For this reason, if the content of the hydrophilic binder material in the electrode is increased so that the activated carbon is not lost, it becomes easier for the hydrophilic binder material to cover the activated carbon surface, reducing the effective ion adsorption pores of the activated carbon and greatly reducing the adsorption performance. However, there has been a problem that the electrolytic efficiency cannot be maximized.

  Further, depending on the type of the hydrophilic binder material, there is a problem that the binding force of the activated carbon cannot be sufficiently obtained, the electrode becomes brittle, and the electrode shape cannot be maintained.

  The present invention has been made in order to solve the above-mentioned problems, and the object of the present invention is to improve the electrolysis efficiency while using a hydrophobic binder material which has been conventionally considered unsuitable for water electrolysis. It is to provide a porous conductive member for water electrolysis.

  The porous electroconductive member for water electrolysis according to the present invention includes a porous conductor portion containing a hydrophilized electrode active material and a binder material, and a collection in contact with or included in the surface of the porous conductor portion. A porous electroconductive member for water electrolysis comprising an electric body portion, wherein the binder material is made of a hydrophobic material.

  In the porous electroconductive member for water electrolysis according to the present invention, it is preferable that the electrode active material is contained in the porous conductor portion by 70 wt% or more and 92 wt% or less.

  In the porous conductive member for water electrolysis according to the present invention, the binder material is preferably a fluorine-based material.

  In the porous electroconductive member for water electrolysis according to the present invention, it is preferable that the porous conductor portion further contains 5 wt% or more of a conductive additive.

  In the porous electroconductive member for water electrolysis according to the present invention, it is preferable that the thickness of the thickest portion of the porous conductor portion is 0.5 mm or more and 1.5 mm or less.

  In the porous electroconductive member for water electrolysis according to the present invention, the thickness of the thickest portion of the porous conductor portion is preferably about 1.0 mm.

  In the porous electroconductive member for water electrolysis according to the present invention, it is preferable to provide a plurality of the current collector portions with respect to the porous conductor portion.

  In the porous electroconductive member for water electrolysis of the present invention, the current collector portion is preferably a metal member without a noble metal coat.

  The porous electroconductive member for water electrolysis according to the present invention is preferably manufactured by performing a surface treatment after roll rolling to make it hydrophilic.

  The present invention also provides a functional water generator provided with the above-described porous electroconductive member for water electrolysis according to the present invention as an electrode for adsorbing and desorbing metal ions in an electrolyzer having a single diaphragm.

  The functional water generator of the present invention is preferably used for dishwashing applications, barber / beauty applications, humidification applications or drinking applications.

  As described above, according to the porous electroconductive member for water electrolysis of the present invention, the porous conductor part including the electrode active material and the binder material subjected to the hydrophilic treatment, and the surface of the porous conductor part are provided. A porous electroconductive member for water electrolysis comprising an abutting or enclosing current collector portion, wherein the binder material is made of a hydrophobic material, so that the adsorption performance of the electrode active material can be maximized . Moreover, according to the porous electroconductive member for water electrolysis of the present invention, preferably, the thickness of the thickest portion of the porous conductor portion (maximum thickness of the adsorption electrode) is 0.5 mm or more and 1.5 mm or less. This makes it possible to optimize the ion processing efficiency. Furthermore, the present invention also provides a functional water generator that generates functional water for use in dishwashing, hairdressing, humidification, or drinking, to which the conductive member for water electrolysis of the present invention is suitably applied. can do.

FIG. 1 (a) is a diagram schematically showing a porous electroconductive member 1 for water electrolysis as a preferred example of the present invention, and FIG. 1 (b) is an enlarged view of a part of FIG. 1 (a). It is a photograph. It is a graph which shows the result of having compared the ion adsorption characteristic with the porous conductor part using a hydrophilic binder material, and the porous conductor part using a hydrophobic binder material. It is a photograph which shows the porous conductor part at the time of using a hydrophobic binder material and a hydrophilic electrode active material. It is a graph which shows the relationship between the content rate and ion treatment efficiency at the time of using activated carbon as an electrode active material. It is a graph which shows the relationship between the content rate of a conductive support agent, and ion processing efficiency at the time of using carbon black as a conductive support agent. It is a graph which shows the relationship between the thickness of the thickest part of a porous conductor part, and ion processing efficiency. It is a figure which shows typically the porous electroconductive member 1,11,21,31 for water electrolysis of the preferable various examples of this invention. It is a figure which shows typically the functional water generator of a preferable example using the porous electroconductive member for water electrolysis of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 (a) is a diagram schematically showing a porous electroconductive member 1 for water electrolysis as a preferred example of the present invention, and FIG. 1 (b) is an enlarged view of a part of FIG. 1 (a). It is a photograph (3000 times magnified photograph by a scanning electron microscope). The porous electroconductive member 1 for water electrolysis according to the present invention is in contact with a porous conductor portion 2 including a hydrophilized electrode active material 4 and a binder material 5, and the surface of the porous conductor portion 2. Alternatively, the current collector section 3 is included (the embodiment shown in FIG. 1A is referred to as “embodiment 1”).

  Here, FIG. 2 is a graph showing the result of actually comparing the ion adsorption characteristics between the porous conductor portion using the hydrophilic binder material and the porous conductor portion using the hydrophobic binder material. The vertical axis represents ion treatment efficiency (%), and the horizontal axis represents ion treatment time (minutes). From FIG. 2, it can be seen that the porous conductor portion using the hydrophobic binder material has higher ion treatment efficiency than the porous conductor portion using the hydrophilic binder material. In addition, the ion treatment efficiency here means the ion desorption efficiency when desorption is performed after performing ion adsorption at a predetermined level or more in the porous conductor portion.

  Conventionally, hydrophobic binder materials have been conventionally considered unsuitable for electrolysis using tap water or the like as raw water. Here, FIG. 3 is a photograph (3000 times magnified photograph taken with a scanning electron microscope) showing the porous conductor portion when a hydrophobic binder material and a hydrophilic electrode active material are used. As is clear from FIG. 3, since the hydrophilic electrode active material and the hydrophobic binder material have low affinity, the binder material does not include the electrode active material and the electrode active material is easily exposed. It is easy to maintain the pore structure of the substance and the gap between the electrode active materials. Therefore, it is possible to suppress the reduction of effective ion adsorption holes and maximize the electrolysis efficiency.

As the electrode active material 4 in the present invention, any electrode active material conventionally used in this field can be used without particular limitation, but particulate activated carbon is preferable. Activated carbon plays an important role in improving the energy density of the electrode, and the type thereof is not particularly limited, and phenolic, rayon-based, acrylic-based, pitch-based, coconut shell-based, etc. can be used, and the specific surface area is preferably The thing of 300-3500m < ² > / g, More preferably, the thing of 1500-2500m < ² > / g can be used. When the specific surface area of the electrode active material is less than 300 m ² / g, the ion adsorption performance tends to deteriorate. Even when the specific surface area of the electrode active material exceeds 3500 m ² / g, it is considered that the ion adsorption performance is reduced, and the ratio of the electrode active material to the porous conductor portion increases, so that the porous conductor portion There is a tendency for the formability of the resin to be lowered and the workability to be lowered. In particular, when the specific surface area of the electrode active material is 1500 to 2500 m ² / g, the ion adsorption performance can be suitably improved.

  The average particle diameter of the electrode active material 4 in the present invention is not particularly limited, but it is within the range of 1 to 45 μm because it is easy to form a thin film and the capacity density can be increased. Preferably, it is in the range of 2-40 μm, more preferably in the range of 3-20 μm.

  The electrode active material 4 in the present invention is subjected to a hydrophilic treatment, and this hydrophilic treatment is performed by a method such as high-temperature activation of sodium hydroxide or water vapor, for example. The electrode active material 4 is improved in wettability with respect to water by the hydrophilic treatment by activation, and can effectively perform ion adsorption on the surface of the electrode active material made porous by activation.

  Further, the current collector part 3 may be in contact with the porous conductor part 2 or may be enclosed (inserted / inserted). In the case of contact, in order to prevent electrolysis from occurring in the current collector, it is desirable to insulate by attaching a polyimide tape or the like.

  The hydrophobic material constituting the binder material 3 in the porous electroconductive member 1 for water electrolysis of the present invention is preferably a fluorine-based material. Here, examples of the fluorine-based material include pothitetrafluoroethylene (PTFE). The fluorine-based material is hydrophobic and is made into fiber (fibrillation) by applying a shear (shearing force) during heat molding. Therefore, networkability can improve the moldability of the porous conductor portion and suppress the elution of the electrode active material from the porous conductor portion.

  When PTFE is used as the hydrophobic material constituting the binder material 3, it is obtained not only by homopolymer of tetrafluoroethylene but also by copolymerization with addition of 0.5 mol% or less of other monomers to tetrafluoroethylene. It may be a copolymer. Examples of these other monomers include trifluoroethylene, (perfluoroalkyl) ethylene, chlorotrifluoroethylene, hexafluoropropylene, and perfluoro (alkyl vinyl ether).

  In the porous electroconductive member 1 for water electrolysis of the present invention, the electrode active material 4 is preferably contained in the porous conductor portion 2 in an amount of 70 wt% or more and 92 wt% or less, and is contained in an amount of 80 wt% or more and 92 wt% or less. It is more preferable. Here, FIG. 4 is a graph showing the relationship between the content rate and ion treatment efficiency when activated carbon is used as the electrode active material, the vertical axis represents the ion treatment efficiency (%), and the horizontal axis represents the activated carbon content. The rate (wt%) is shown. As shown in FIG. 4, by setting the content ratio of the electrode active material (activated carbon in the example of FIG. 4) within the above range, for example, the content ratio of the electrode active material in the porous conductor portion is 70 wt%, the binder When the content of the material is 27 wt% (conducting aid: 3 wt%), it is possible to suppress the elution of the electrode active material from the porous conductor portion. In this case, the ion treatment efficiency is about 80%. Can be held. Further, even when the electrode active material content is 91.5 wt% and the binder content is 5.5 wt% (conducting aid: 3 wt%), the electrode active material 4 is removed from the porous conductor portion 2. It is possible to substantially suppress the elution, and in this case, it is possible to maintain almost 100% as the ion processing efficiency.

  That is, by forming the binder material 5 with a hydrophobic material such as PTFE, the blending ratio of the binder material 5 can be reduced as much as possible, and the content ratio of the electrode active material can be increased as high as 70 wt% or more and 92 wt% or less. Therefore, it is preferable from the viewpoint of ion processing efficiency.

  In the present invention, it is desirable that the porous conductor portion 2 further contains 5 wt% or more of a conductive additive. The addition of a conductive additive improves electron transfer between adjacent electrode active materials, which is preferable from the viewpoint of ion treatment efficiency.

  As the conductive assistant, a material having high electrical conductivity such as carbon black can be used. Since carbon black imparts conductivity to the electrode and contributes to a reduction in internal resistance, it is sufficient that the carbon black has excellent conductivity, such as acetylene black or ketjen black. 01-1 micrometer is preferable.

  FIG. 5 is a graph showing the relationship between the content of the conductive assistant and the ion treatment efficiency when activated carbon is fixed as the electrode active material 4 at a content of 70 wt% and carbon black is used as the conductive assistant. The vertical axis represents ion treatment efficiency (%), and the horizontal axis represents the content (wt%) of the conductive additive. As shown in FIG. 5, the ion treatment efficiency is almost constant until the content of the conductive auxiliary is 5 wt%, but increases from the content of the conductive auxiliary of 5 wt%, and the ion treatment efficiency is increased when the content of the conductive auxiliary is 10 wt%. Increases by more than 10%. Accordingly, the content of the conductive assistant is preferably 5 wt% or more, and more preferably 10 wt% or more.

  Moreover, the porous electroconductive member 1 for water electrolysis of the present invention has a porous conductor part from the viewpoint of solving the problem that water does not permeate into the adsorption electrode, which is a problem when a hydrophobic binder material is used. The thickness of the thickest part 2 is preferably 0.5 mm or more and 1.5 mm or less. Here, “the thickness of the thickest portion” of the porous conductor portion 2 is a porous conductor in a direction (thickness direction) perpendicular to a plane parallel to the current collector portion 3 of the porous conductor portion 2. The straight line distance between the end of the part 2 and the current collector part 3 is indicated. FIG. 6 is a graph showing the relationship between the thickness of the thickest portion of the porous conductor portion and the ion treatment efficiency when the electrolysis time is 4 minutes, 6 minutes, and 8 minutes, and the vertical axis represents the ion treatment efficiency. (%), The horizontal axis indicates the thickness (mm) of the thickest portion of the porous conductor portion. As can be seen from FIG. 6, the ion treatment efficiency is high in any electrolysis time within the range where the thickness of the thickest part of the porous conductor portion is 0.5 mm or more and 1.5 mm or less, but outside this range, Ion processing efficiency becomes worse. This is because up to a certain thickness, as the thickness of the porous conductor portion increases, the ion treatment performance increases and the ion treatment efficiency improves, but when the thickness exceeds the limit, the electric double layer is formed. It is considered that the ion processing efficiency deteriorates when the distance between the electrode and the current collector is increased. In order to avoid this influence, the porous electroconductive member 1 for water electrolysis according to the present invention is preferably ion-treated by setting the thickest portion of the porous conductor portion to 0.5 mm or more and 1.5 mm or less. Efficiency can be improved.

In addition, the measurement conditions and members used in FIG. 2 and FIGS. 4 to 6 described above are as follows.
Capacity of tap water: 80mL, 90mA constant current drive,
Platinum electrode: manufactured by Daiso Engineering, size: 60 × 60 mm (t = 1),
Porous conductive member: activated carbon (MSP-20 manufactured by Kansai Thermochemical Co., Ltd.), carbon black (ECP-600JD manufactured by Lion Corporation), binder material (F-201 (F) manufactured by Daikin Industries, Ltd.), size: 50 × 50 mm.

  Electrolysis is performed by first performing ion adsorption for a predetermined time (adsorption time = desorption time) using a metal electrode as an anode and an ion adsorption electrode as a cathode, and then performing an electrolysis by passing a current whose polarity is reversed. The amount of desorbed metal ions is measured. That is, based on the following formulas (1) and (2), the desorption amount of the metal ions is calculated from the pH fluctuation, and the ratio to the theoretical adsorption amount based on Faraday's second law (the following formula (3)). = Calculated as ion treatment efficiency.

M → M ²⁺ + 2e ⁻ (1)
2H ₂ O + 2e ⁻ → H ₂ + 2OH ⁻ (2)
Q = I × t = z × n × F (3)
Here, Q is the amount of electricity (C), I is the amount of current (A), t is the time (sec), z is the ionic valence (= 2), n is the molar amount of the metal ion, and F is the Faraday constant (= 9.65 × 10 ⁴ C / mol).

  Furthermore, the porous electroconductive member for water electrolysis of the present invention has the maximum ion treatment efficiency by setting the thickness of the thickest part to approximately 1.0 mm, that is, within the range of 0.8 mm to 1.2 mm. It is possible to

  Here, FIG. 7 is a diagram schematically showing porous electroconductive members 1, 11, 21, 31 for water electrolysis of various preferred examples of the present invention. Here, FIG. 7A shows an embodiment 1 similar to that shown in FIG. 1A (porous electroconductive member 1 for water electrolysis), and FIG. 7B shows an embodiment. 2 (porous electroconductive member 11 for water electrolysis), FIG. 7 (c) shows Embodiment 3 (porous electroconductive member 21 for water electrolysis), and FIG. 7 (d) shows Embodiment 4 ( A porous conductive member 31) for water electrolysis is shown. FIG. 7 shows the thickness direction of the porous conductive member (the direction perpendicular to the plane parallel to the current collector portion 3) in the vertical direction with respect to the paper surface.

  FIG. 7A shows a case where the current collector portion 3 is brought into contact with the surface of the porous conductor portion 2, and FIG. 7B shows the inside of the porous conductor portion 12. An example in which the current collector portion 13 is included (pinched / inserted) is shown. Further, the porous electroconductive member for water electrolysis of the present invention may have a configuration in which a plurality of current collector portions are provided as in the examples shown in FIGS. 7 (c) and 7 (d). In FIG. 7 (c), the two current collector parts 23, 24 are placed inside the porous conductor part 22 so as to be spaced apart (2d in FIG. 7 (c)). 7 (d), and FIG. 7 (d) shows three current collectors that are spaced from each other (2d in FIG. 7 (d)) inside the porous conductor portion 32. An example in which the body part 33 is included (sandwiched / inserted), and the current collector part 33 is bundled (connected) in a region protruding from the porous conductor part 32 in consideration of formability. Show. In FIG. 7, the distance d is synonymous with the above-mentioned “thickness of the thickest portion”, and is preferably in the range of 0.5 mm or more and 1.5 mm or less. Can be optimized. 7C and 7D, when a plurality of current collector portions are provided, the distance between the current collectors is 2d (that is, the thickness of the thickest portion). 2 times) is preferable.

  As shown in FIGS. 1 and 7A, when the current collector part 3 is brought into contact with the surface of the porous conductor part 2, electrolysis is prevented from occurring in the current collector part. Therefore, it is desirable to insulate the current collector part 3 by attaching a polyimide tape or the like on the side opposite to the side in contact with the porous conductor part 2.

  In the porous electroconductive member for water electrolysis of the present invention, since the hydrophobic binder material is used, the electrolytic solution hardly penetrates into the activated carbon electrode. Therefore, the current collector does not necessarily need a noble metal coat such as a platinum coat. For this reason, in the porous electroconductive member for water electrolysis of the present invention, the current collector portion may be a metal member without a noble metal coat, and a metal such as stainless steel or titanium metal that is easily eluted by the electrolytic solution is used as it is. Therefore, the electrode cost can be reduced.

  Moreover, it is preferable that the porous electroconductive member for water electrolysis of this invention is manufactured by performing surface treatment after roll rolling, and making it hydrophilic. The porous electroconductive member for water electrolysis of the present invention is obtained by rolling a precursor of a porous electroconductive portion containing an electrode active material and a hydrophobic binder material, and obtaining the sheet-like material (porous electroconductive sheet) Moreover, it can manufacture suitably by performing a hydrophilic treatment as surface treatment. Examples of the hydrophilic treatment method for the porous conductive sheet include metal sodium solution treatment, EB irradiation treatment, plasma treatment, excimer laser treatment, ultraviolet laser treatment, corona treatment, and sulfonation treatment. Thus, the inside of an electrode can be adsorbed by hydrophilizing the porous conductive sheet to obtain the porous electroconductive member for water electrolysis of the present invention.

  Here, FIG. 8 is a diagram schematically showing a preferred example of the functional water generator 51 using the porous electroconductive member for water electrolysis of the present invention. The present invention also provides a functional water generator provided with the above-described porous electroconductive member for water electrolysis according to the present invention as an electrode for adsorbing and desorbing metal ions in an electrolyzer having a single diaphragm. The functional water generator 51 of the example shown in FIG. 8 includes an electrolyzer 52 of a non-diaphragm 1 tank type including the porous conductive members 1, 11, 21, 31 of the present invention described above and a platinum electrode 54. The functional water generator 51 of the example shown in FIG. 8 is a constant current generator for supplying a current that is electrically connected to the porous conductive members 1, 11, 21, 31 and the platinum electrode 54 in the electrolytic cell 52. A source 55, a switching circuit 56 for appropriately switching the current supplied to the porous conductive member and the platinum electrode, and a constant current source 55 and the switching circuit 56 to control water electrolysis in the electrolytic cell. The control device 57 is provided. The constant current generation source 55, the switching circuit 56, and the control device 57 may be used in combination with appropriate ones known in the art, and are not particularly limited.

  By using a functional water generator as shown in FIG. 8, the platinum electrode is used as the anode / cathode and the porous conductive member for water electrolysis is used as the cathode / cathode with respect to the raw water (for example, tap water) supplied into the electrolytic vessel. Acidic / alkaline water can be generated by electrolysis using the anode. “Functional water” as used in the present invention is a generic term for this acidic water and alkaline water.

  Thus, by using the porous electroconductive member for water electrolysis according to the present invention in an electrolyzer having one diaphragm, the electrode tank can be simplified, and in principle, no waste water is generated. It is possible to produce water such as acidic / alkaline water.

  In addition, the functional water generator of the present invention is characterized in that it is used for dishwashing, hairdressing, humidification, or drinking. By using the porous electroconductive member for water electrolysis according to the present invention, the moldability of the binder material is strong, and it is possible to substantially suppress the elution of the electrode active material from the porous conductor portion. Therefore, there is little problem of elution even in applications where contamination with impurities such as dishwashing use, barber / beauty use, humidification use, or drinking use is a problem.

  1,11,21,31,53 Porous conductive member for water electrolysis, 2,12,22,32 Porous conductor part, 3,13,23,33 Current collector part, 4 Electrode active material, 5 Binder Material, 51 functional water generator, 52 electrolytic cell, 54 platinum electrode, 55 constant current source, 56 switching circuit, 57 control circuit.

Conventionally, as an electrode material of an electric double layer capacitor, it is common to use activated carbon or the like as an electrode active material and to perform molding using a fluorine-based hydrophobic binder material. However, in electrolysis using tap water or the like as raw water, when a fluororesin binder material such as polytetrafluoroethylene is used as the hydrophobic binder material, the binder material has water repellency. There was a problem that the impregnation property was poor and predetermined electrical characteristics could not be obtained in electrolysis or the like.

The hydrophobic material constituting the binder material 3 in the porous electroconductive member 1 for water electrolysis of the present invention is preferably a fluorine-based material. Here, examples of the fluorine-based material include polytetrafluoroethylene (PTFE), and the fluorine-based material is hydrophobic and is made into a fiber (fibrillation) by applying a shear (shearing force) during heat molding. Therefore, networkability can improve the moldability of the porous conductor portion and suppress the elution of the electrode active material from the porous conductor portion.

In addition, the measurement conditions and members used in FIG. 2 and FIGS. 4 to 6 described above are as follows.
Capacity of tap water: 80mL, 90mA constant current drive,
Platinum electrode: manufactured by Daiso Engineering, size: 60 × 60 mm (t = 1),
Porous conductive member: activated carbon (MSP-20 manufactured by Kansai Thermochemical Co., Ltd.), carbon black (ECP-600JD manufactured by Lion Corporation), binder material ( Polyflon (registered trademark) PTFE F-201 manufactured by Daikin Industries, Ltd.), size: 50 × 50 mm.

Claims (11)

  Porous conductive material for water electrolysis comprising a porous conductor part including a hydrophilized electrode active material and a binder material, and a current collector part in contact with or included in the surface of the porous conductor part A porous conductive member for water electrolysis, wherein the binder material is made of a hydrophobic material.   2. The porous conductive member for water electrolysis according to claim 1, wherein the electrode active material is contained in the porous conductor portion at 70 wt% or more and 92 wt% or less.   The porous conductive member for water electrolysis according to claim 1 or 2, wherein the binder material is a fluorine-based material.   The porous conductive member for water electrolysis according to any one of claims 1 to 3, wherein the porous conductor portion further contains 5 wt% or more of a conductive additive.   The porous body for water electrolysis according to any one of claims 1 to 4, wherein the porous conductor portion has a thickness of a thickest portion of 0.5 mm or more and 1.5 mm or less. Conductive member.   The porous conductive member for water electrolysis according to any one of claims 1 to 4, wherein the thickness of the thickest portion of the porous conductor portion is approximately 1.0 mm.   The porous conductive member for water electrolysis according to any one of claims 1 to 6, wherein a plurality of the current collector portions are provided with respect to the porous conductor portion.   The porous conductive member for water electrolysis according to any one of claims 1 to 7, wherein the current collector portion is a metal member without a noble metal coat.   The porous conductive member for water electrolysis according to any one of claims 1 to 8, wherein the porous conductive member is manufactured by performing a surface treatment after roll rolling to make it hydrophilic.   A functional water generator, comprising the porous electroconductive member for water electrolysis according to any one of claims 1 to 9 as an electrode for adsorbing and desorbing metal ions in an electrolyzer having a single diaphragm.   The functional water generator according to claim 10, wherein the functional water generator is used for dishwashing, hairdressing, humidification, or drinking.