JP2009195884A - Apparatus for generating electrolytic water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for generating electrolytic water easily providing electrolytic water with high dissolved gas concentration (in particular dissolved hydrogen concentration), while suppressing rise of pH value of the electrolytic water (in particular, hydrogen dissolved water). <P>SOLUTION: The apparatus 100 for generating electrolytic water generating the electrolytic water by electrolysis of raw water, is provided with a positive electrode 20 and a negative electrode 30 fed with the raw water, and a diaphragm 40 disposed between both electrodes. A platinum catalyst layer having a noble metal platinum as a main component is formed on at least one surface of any one of the positive electrode 20 and negative electrode 30. Fine holes with an average diameter of 50 μm or less are formed on the platinum catalyst layer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrolyzed water generating device, and more particularly to an electrolyzed water generating device that electrolyzes raw water to generate electrolyzed water.

  In recent years, electrolyzed water obtained by electrolyzing water (for example, alkaline ionized water) has attracted attention as having medical effects such as improvement of gastrointestinal symptoms. As one of electrolyzed water generating apparatuses that generate this type of electrolyzed water, an apparatus including a diaphragm type electrolytic cell has been proposed (for example, Patent Document 1). An apparatus equipped with a diaphragm type electrolytic cell has an electrolytic cell having a structure in which a pair of electrodes (cathode and anode) is partitioned by a diaphragm such as an ion exchange membrane, whereby the inside of the electrolytic cell is divided into a cathode chamber and an anode. It is divided into rooms.

When raw water (for example, tap water) is introduced into the cathode chamber and the anode chamber of the electrolytic cell and a voltage is applied between the electrodes, the water in contact with the electrodes is electrolyzed and the electrolytic reaction proceeds. At that time, in the cathode chamber, hydrogen (H ₂ ) and hydroxide ions (OH ⁻ ) are generated by an electrolytic reaction, and therefore alkaline electrolyzed water (cathode water) having a high hydroxide ion concentration from the cathode chamber. Can be obtained. On the other hand, in the anode chamber, oxygen (O ₂ ) and hydrogen ions (H ⁺ ) are generated by the electrolytic reaction, so that acidic electrolyzed water (anode water) having a high oxygen ion concentration can be obtained from the anode chamber. .

By the way, as a parameter representing the nature of this type of electrolyzed water, the pH value such as the acidity and alkalinity described above and the amount of mineral components contained in the electrolyzed water are often evaluated. The concentration of dissolved hydrogen present in the cathode water) is also attracting attention as one of the important parameters. That is, there is interest in the fact that dissolved hydrogen in electrolyzed water has various effects on the living body. And when using electrolyzed water (hydrogen dissolved water) with such a high dissolved hydrogen concentration as drinking water, it is calculated | required that the pH value maintains neutral vicinity suitable for drinking.
Japanese Patent No. 3349710

  However, in the conventional electrolyzed water generator, not only hydrogen but also hydroxide ions are generated in the cathode chamber by electrolysis of water, so that the dissolved hydrogen concentration and pH value in the electrolyzed water are appropriate values (especially drinking). It was very difficult to adjust the pH to around 7.5). That is, if the amount of electricity for electrolysis is increased to increase the dissolved hydrogen concentration in the electrolyzed water, the pH value of the electrolyzed water is also greatly increased by the simultaneously generated hydroxide ions, so that, for example, in the pH of 6.8 to 7.8 It was very difficult to collect cathodic water (hydrogen-dissolved water) having a high dissolved hydrogen concentration of 1.5 ppm or more in the sex region.

  This invention is made | formed in view of this point, The main objective is the electrolyzed water with high dissolved gas concentration (especially dissolved hydrogen concentration), suppressing the raise of the pH value of electrolyzed water (especially cathode water). It is providing the electrolyzed water generating apparatus which can obtain easily. Moreover, it is providing the member for electrodes used for such an electrolyzed water generating apparatus, and the manufacturing method of the member for electrodes.

  The electrolyzed water generating device provided by the present invention is an electrolyzed water generating device that electrolyzes raw water to generate electrolyzed water. Such a generator includes an anode and a cathode to which the raw water is supplied, and a diaphragm disposed between the anode and the cathode. A platinum catalyst layer mainly composed of platinum, which is a noble metal element, is formed on the surface of at least one of the anode and the cathode. The platinum catalyst layer has pores with an average pore diameter of 50 μm or less.

  In a preferred embodiment, the platinum catalyst layer is formed by baking a platinum compound containing hexachloroplatinic acid with dry steam at a predetermined temperature.

  In a preferred embodiment, the cathode is disposed in a cathode chamber into which the raw water is introduced, and in the cathode chamber, hydrogen-dissolved water discharge that discharges hydrogen-dissolved water that dissolves hydrogen generated from the cathode is discharged. The paths are connected, and the hydrogen-dissolved water discharge path includes a stirring means for stirring the discharged hydrogen-dissolved water.

  In a preferred embodiment, the stirring means is a spiral tube provided in the middle of the hydrogen-dissolved water discharge path.

  In a preferred embodiment, the hydrogen-dissolved water discharge path includes a hydrogen concentration detection means for detecting a dissolved hydrogen concentration of the discharged hydrogen-dissolved water, and a case where the detected dissolved hydrogen concentration is less than a predetermined concentration. And a reflux means for refluxing the discharged hydrogen-dissolved water to the cathode chamber.

  In a preferred embodiment, the anode is arranged in an anode chamber into which the raw water is introduced, and a holding member for holding the introduced raw water is arranged in the anode chamber. ing.

  In a preferred embodiment, the holding member for holding the raw water is a porous sheet disposed in contact with the outer surface of the anode.

  In a preferred embodiment, the anode is disposed in an anode chamber into which the raw water is introduced, and in the anode chamber, oxygen-dissolved water discharge that discharges oxygen-dissolved water that dissolves oxygen generated from the anode is discharged. A path is connected, and the oxygen-dissolved water discharge path includes a separating means for separating oxygen from the discharged oxygen-dissolved water.

  Moreover, this invention provides the member for electrodes used in order to produce | generate electrolyzed water. The electrode member includes an electrode material mainly composed of a conductive metal and a platinum catalyst layer formed on the surface of the electrode material. The platinum catalyst layer is mainly composed of platinum, which is a noble metal element, and has pores with an average pore diameter of 50 μm or less.

  In a preferred embodiment, the platinum catalyst layer is formed by baking a platinum compound containing hexachloroplatinic acid with dry steam at a predetermined temperature.

  Furthermore, this invention provides the manufacturing method of the member for electrodes used in order to produce | generate electrolyzed water. Such a method includes a step of preparing an electrode material mainly composed of a conductive metal, a coating step of applying a catalyst-forming coating solution containing hexachloroplatinic acid to the surface of the prepared electrode material, and the catalyst-forming coating solution. And a firing step of firing a platinum catalyst layer mainly composed of platinum on the surface of the electrode material. In the firing step, the firing is performed using dry steam at a predetermined temperature.

  In a preferred embodiment, the firing step includes a first firing process for firing the electrode material with dry steam at a predetermined temperature, and a second firing process for firing with dry steam at a higher temperature than the first firing process. including.

  In a preferred embodiment, the catalyst-forming coating solution further contains hexachloroiridium acid.

  According to the electrolyzed water generating apparatus of the present invention, hydrogen bubbles generated on the cathode surface are released through the pores (micropores having an average pore diameter of 50 μm or less) of the platinum catalyst layer formed on the cathode surface. The generated hydrogen bubbles can be made very small. In addition, since the interfacial tension between the cathode surface and water is reduced by the action of the micropores, it is possible to improve the bubble separation of the generated hydrogen bubbles. As a result, hydrogen bubbles generated from the cathode surface can be quickly dispersed in water with a small size, and the dissolved hydrogen concentration in the hydrogen-dissolved water can be increased efficiently. Further, according to the electrolyzed water generating apparatus of the present invention, the dissolved hydrogen concentration can be increased efficiently, so that the amount of electrolysis required to obtain a desired dissolved hydrogen concentration can be reduced, and the hydrogen dissolved An increase in the pH value of water can be suppressed.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, members / parts having the same action are described with the same reference numerals. In addition, the dimensional relationships (length, width, thickness, etc.) in each drawing do not reflect actual dimensional relationships.

  The electrolyzed water generating apparatus 100 according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram schematically showing the overall configuration of the electrolyzed water generating apparatus 100.

  The electrolyzed water generating apparatus 100 is an apparatus for electrolyzing raw water to generate electrolyzed water (in this embodiment, hydrogen-dissolved water in which hydrogen generated from a cathode is dissolved). As shown in FIG. 1, the generating apparatus 100 includes an electrolytic cell 10, a raw water supply path 50 that introduces raw water into the electrolytic tank 10, and an electrode water discharge path that guides the electrolytic water discharged from the electrolytic tank 10 to the outside. 70 and 60.

  The electrolytic cell 10 is a diaphragm type electrolytic cell, and has a structure in which a pair of electrodes (anode 20 and cathode 30) to which raw water is supplied are partitioned by a diaphragm 40. The inner space of the electrolytic cell 10 is divided into two by the diaphragm 40. In this embodiment, a wall surface 90 is further provided inside the electrolytic cell 10, and the internal space of the electrolytic cell 10 is divided into an anode chamber 24 and a cathode chamber 34 by the wall surface 90 and the diaphragm 40.

  A raw water supply path 50 is connected to the inlet side (lower side in the figure) of the electrolytic cell 10. The raw water supply path 50 is connected to a pump (not shown), and is configured to introduce (convey) the raw water sent by the pump continuously (or intermittently) into the electrolytic cell 10. Yes. In this embodiment, the raw water supply path 50 is branched into two paths (an anode side supply path 52 and a cathode side supply path 54) on the downstream side. The anode side supply path 52 is connected to the anode chamber 24 and introduces (conveys) a part of the raw water pumped out to the anode chamber 24. On the other hand, the cathode side supply path 54 is connected to the cathode chamber 34, and introduces (conveys) a part of the raw water pumped out to the cathode chamber 34.

  An electrolytic water discharge path is connected to the outlet side (upper side in the drawing) of the electrolytic cell 10, and the electrolytic water (anode water and cathode water) discharged from the anode chamber 24 and the cathode chamber 34 is discharged to a predetermined position. It is configured as follows. In this embodiment, an oxygen-dissolved water discharge path 70 is connected to the anode chamber 24, and anode water that has flowed out from the anode chamber 24 (in this example, oxygen-dissolved water that dissolves oxygen generated from the anode 20). It comes to discharge. On the other hand, a hydrogen-dissolved water discharge path (upstream discharge path 60 and downstream discharge path 61) is connected to the cathode chamber 34, and the cathode water flowing out from the cathode chamber 34 (in this example, generated from the cathode 30). Hydrogen dissolved water that dissolves hydrogen) is discharged. In this embodiment, the upstream discharge path 60 is connected to a downstream discharge path 61 via an electromagnetic valve 68, and the downstream discharge path 61 is connected to the outside of the apparatus via an outlet cock 69.

  The raw water introduced into the electrolytic cell 10 may be an electrolytic solution containing at least water molecules (hydrogen molecules and oxygen molecules can be generated by electrolysis), and the configuration of the electrolyzed water generating device (for example, a diaphragm) A suitable one can be used depending on the type of the above. For example, when using a solid polymer electrolyte membrane such as an ion exchange membrane, neutral water such as purified water (for example, water from which impurities have been removed by activated carbon, etc.), RO permeated water, ion exchange water, or pure water is preferably used. can do. Alternatively, when using a neutral electrolytic membrane such as a porous resin membrane, an electrolytic solution obtained by adding a salt such as sodium chloride or an acid or alkali such as sulfuric acid or caustic soda to water is introduced into the electrolytic cell as raw water. May be.

  Next, the internal structure of the electrolytic cell 10 according to this embodiment will be further described with reference to FIG. FIG. 2 is an enlarged view of a main part in which the main part inside the electrolytic cell in FIG. 1 is enlarged. In the present embodiment, as shown in FIG. 2, in the electrolytic cell 10, mesh insulators 42 a and 42 b are arranged on both side surfaces of the diaphragm 40, and the anode 20 and the cathode 30 are disposed on both outer sides of the mesh insulators 42 a and 42 b. It has the structure which arranged.

  The diaphragm 40 is preferably made of a material excellent in heat resistance and corrosion resistance (such as acid resistance and alkali resistance), and more preferably made of water soaked and difficult to sag. As the type of the diaphragm, an appropriate one can be used according to the configuration of the electrolyzed water generating device (for example, an electrolysis method to be employed). In this embodiment, the diaphragm 40 is a cation exchange membrane, and a fluororesin-based membrane excellent in heat resistance and corrosion resistance (for example, Nafion manufactured by DuPont) is preferably used. In addition, the thickness of the diaphragm 40 is about 0.5 mm-2.0 mm, for example.

  The net-like insulators 42 a and 42 b are sheet members formed in a net-like (or grid-like) shape, and are sandwiched between the electrodes 20 and 30 and the diaphragm 40. The mesh insulators 42a and 42b are paths for raw water. That is, the net-like insulator 42 a on the anode side is sandwiched between the anode 20 and the diaphragm 40, and raw water is introduced between the anode 20 and the diaphragm 40. The cathode-side mesh insulator 42 b is sandwiched between the cathode 30 and the diaphragm 40, and raw water is introduced between the cathode 30 and the diaphragm 40. Such net-like insulators 42a and 42b are preferably made of a material having insulating properties and chemical stability. In this embodiment, the fluororesin sheet (Teflon sheet in this example) is formed into a diamond-like pattern. What was cut into a net is preferably used. The thickness of the mesh insulators 42a and 42b is, for example, about 0.5 mm to 1.0 mm.

  The anode 20 and the cathode 30 are disposed to face each other with the diaphragm 40 and the net-like insulators 42a and 42b interposed therebetween. The shape of the anode 20 is not particularly limited as long as it can be accommodated in the anode chamber 24, but here, a flat plate shape is adopted from the viewpoint of ensuring rigidity. The material of the anode 20 is preferably a metal material having good conductivity and electrochemically inactive, and here, a titanium material is suitably used. The shape of the cathode 30 is not particularly limited as long as it can be accommodated in the cathode chamber 34, but a flat plate shape is adopted here from the viewpoint of ensuring rigidity. The material of the cathode 30 is preferably a metal material having good conductivity and electrochemically inactive, and here, a titanium material is suitably used. The anode 20 and the cathode 30 are connected to a power source (not shown), and the power source applies a DC voltage between the anode 20 and the cathode 30. The voltage from the power source is, for example, about 4.2V to 4.5V. The thickness of the anode 20 and the cathode 30 is, for example, about 0.8 mm to 1.2 mm.

  Platinum catalyst layers 22 and 32 are formed on at least one surface of the anode 20 and the cathode 30. In this embodiment, a platinum catalyst layer 22 is formed on the surface of the anode 20, and a platinum catalyst layer 32 is formed on the surface of the cathode 30. The platinum catalyst layers 22 and 32 may be selectively formed on one side of the electrodes 20 and 30 (in this embodiment, the side facing the diaphragm 40), but are formed on both sides of the electrodes 20 and 30. It is preferable. The platinum catalyst layers 22 and 32 preferably cover the entire surface of each electrode 20 and 30 uniformly (with a uniform layer thickness). The platinum catalyst layers 22 and 32 have a thickness of about 3 μm, for example.

  The platinum catalyst layers 22 and 32 are made of a platinum compound mainly composed of platinum (Pt) which is a noble metal element. Preferred examples of such a platinum compound include hexachloroplatinic acid hexahydrate. The platinum catalyst layers 22 and 32 may contain other metals (for example, platinum group elements such as ruthenium, rhodium, palladium, osmium, iridium, etc.), alloys or oxides thereof. As such platinum catalyst layers 22 and 32, for example, a mixture of platinum (Pt) and iridium (Ir) at a predetermined Pt / Ir ratio (for example, 7: 3) can be used. The platinum catalyst layers 22 and 32 can have their skeleton formed in a state where platinum and iridium are mixed.

The platinum catalyst layers 22 and 32 described above have a large number of pores (not shown), and the surface of the platinum catalyst layers 22 and 32 is formed by the independent pores (or the connection of a large number of pores). It is comprised so that a back surface can be connected. Bubbles generated from the surfaces of the electrodes 20 and 30 (hydrogen bubbles on the cathode side) are discharged through the pores. The shape of such a pore is not particularly limited, and may be any shape such as a slit shape or a cylinder shape. The average pore diameter of the pores may be 50 μm or less, and preferably in the range of 10 μm to 50 μm. In addition, such a platinum catalyst layer can be easily formed by baking a platinum compound containing, for example, hexachloroplatinic acid with dry steam.

  When generating electrolyzed water (here, hydrogen-dissolved water) using the electrolyzed water generating apparatus 100 configured as described above, first, raw water is introduced into the anode chamber 24 via the anode-side supply path 52 ( Arrow "81"), raw water is introduced into the cathode chamber 34 via the cathode side supply path 54 (arrow "82"). Next, a direct current voltage is applied between the anode 20 and the cathode 30 to electrolyze water in contact with the anode 20 and the cathode 30. By this electrolysis, the electrolytic reaction proceeds on the anode surface and the cathode surface, respectively.

Specifically, as shown in FIG. 2, on the anode side, water molecules (H ₂ O) that have contacted the surface of the anode 20 through the net-like insulator 42a on the anode side emit electrons, thereby causing oxygen molecules (O _2). ) And hydrogen ions (H ⁺ ). The generated oxygen molecules (O ₂ ) are released into water around the anode 20 as bubbles. The released hydrogen bubbles are dissolved in the water around the anode 20, thereby generating oxygen-dissolved water in which oxygen generated from the anode 20 is dissolved. The oxygen-dissolved water generated in this way is discharged to the outside of the anode chamber 24 via the oxygen-dissolved water discharge path 70 (arrow “83”).

On the other hand, on the cathode side, hydrogen molecules (H ₂ ) and hydroxide ions (OH ⁻ ) are received by the water molecules (H ₂ O) coming into contact with the surface of the cathode 30 through the network insulator 42b on the cathode side. ) Is generated. The generated hydrogen molecules (H ₂ ) are released into water around the cathode 30 as bubbles. The released hydrogen bubbles are dissolved in the water around the cathode 30, thereby generating hydrogen-dissolved water in which hydrogen generated from the cathode 30 is dissolved.

  At this time, hydrogen bubbles generated on the cathode surface are released through the pores of the platinum catalyst layer formed on the cathode surface (micropores having an average pore diameter of 50 μm or less), so the generated hydrogen bubbles are very small. Become. In addition, since the interfacial tension between the cathode surface and water is reduced by the action of the micropores, the generated hydrogen bubbles are better separated. Therefore, the hydrogen bubbles generated from the cathode surface are quickly dispersed in water with a small size, and the dissolved hydrogen concentration in the generated hydrogen-dissolved water increases.

  The hydrogen-dissolved water thus generated is discharged to the outside of the cathode chamber 34 through the upstream discharge path 60 of the hydrogen-dissolved water (arrow “82”), and then the downstream discharge path via the electromagnetic valve 68. 61 (arrow “84”), and then led to the outside of the apparatus via the outlet cock 69 (arrow “86”). In this way, hydrogen-dissolved water having a high dissolved hydrogen concentration can be collected.

  According to the electrolyzed water generating apparatus 100 of the present embodiment, hydrogen bubbles generated on the cathode surface are released through the pores (micropores having an average pore diameter of 50 μm or less) of the platinum catalyst layer 32 formed on the cathode surface. Therefore, the generated hydrogen bubbles can be made very small. In addition, since the interfacial tension between the cathode surface and water is reduced by the action of the micropores, the generated hydrogen bubbles can be separated from the bubble (detached from the cathode surface) (in other words, on the cathode surface). It is possible to avoid a situation where hydrogen bubbles adhere and aggregate and grow large).

  As a result, the generated hydrogen bubbles can be quickly dispersed in the water with a small size, and the dissolved hydrogen concentration in the hydrogen-dissolved water can be efficiently increased. The reason why the dissolved hydrogen concentration increases by dispersing with small bubbles will be explained. Since the internal pressure of minute hydrogen bubbles increases, hydrogen molecules and water molecules move smoothly at the interface between hydrogen bubbles and water. Therefore, it becomes easy to dissolve hydrogen molecules in water.

  In addition, according to the above configuration, the dissolved hydrogen concentration can be increased efficiently, so the amount of electrolysis required to obtain the desired dissolved hydrogen concentration can be reduced, and the pH value of the hydrogen dissolved water can be reduced. The rise can be suppressed.

  That is, in a typical electrolyzed water generator, when the amount of electricity in electrolysis is increased to increase the dissolved hydrogen concentration of hydrogen-dissolved water, the pH value of the hydrogen-dissolved water is also greatly increased by the simultaneously generated hydroxide ions. For this reason, it has been very difficult to adjust the dissolved hydrogen concentration and pH value to appropriate values (particularly around pH 7.5 suitable for drinking). On the other hand, according to the electrolyzed water generating apparatus 100 of the present embodiment, the dissolved hydrogen concentration of hydrogen-dissolved water can be efficiently increased by the presence of the pores of the platinum catalyst layer 32, and the electric flow rate of electrolysis is increased. You don't have to. Therefore, according to the electrolyzed water generating apparatus 100 of the present embodiment, an increase in the pH value of the hydrogen-dissolved water can be suppressed.

Further, in this embodiment, by interposing the network insulator 42b between the cathode 30 and the diaphragm 40, hydrogen molecules (surfaces on the side of the diaphragm 40 and surfaces on the opposite side of the diaphragm 40) from the both surfaces of the cathode 30 (see FIG. H ₂ ) can be generated and therefore hydrogen bubbles can be generated more efficiently. Thereby, the dissolved hydrogen concentration in the hydrogen-dissolved water can be further increased.

Further, in this embodiment, since a cation exchange membrane is used as the material of the diaphragm 40, a part of hydrogen ions (H ⁺ ) generated on the anode side is introduced to the cathode side through the diaphragm 40. Can do. A part of the hydrogen ions (H ⁺ ) introduced to the cathode side in this way comes into contact with the cathode surface and receives electrons to become hydrogen molecules (H ₂ ). In this electrolytic reaction, since hydroxide ions (OH ⁻ ) are not generated, an increase in the pH value of hydrogen-dissolved water can be suppressed. In addition, some of the hydrogen ions (H ⁺ ) introduced to the cathode side are combined with hydroxide ions (OH ⁻ ) generated on the cathode surface to form water molecules (H ₂ O). In this electrolytic reaction, hydroxide ions (OH ⁻ ) generated on the cathode surface are consumed, so that an increase in the pH value of hydrogen-dissolved water can be further suppressed.

  In addition, when this inventor actually manufactured hydrogen-dissolved water using the electrolyzed water generating apparatus 100 described above, the dissolved hydrogen concentration was 1.5 to 1.9 ppm while maintaining a pH of about 7.5 neutral. It was possible to obtain hydrogen-dissolved water having a high dissolved hydrogen concentration. From this, it was confirmed that by using the electrolyzed water generating apparatus 100 of this embodiment, it is possible to collect hydrogen-dissolved water having a high dissolved hydrogen concentration suitable for drinking.

The average pore diameter of the platinum catalyst layer 32 may be 50 μm or less, and is preferably in the range of 10 μm to 50 μm. When the average pore diameter of the platinum catalyst layer 32 is larger than 50 μm, the bubble size of the generated hydrogen is also increased accordingly, so that the internal pressure of the bubble is lowered. Therefore, the hydrogen molecules (H ₂ ) in the bubbles are reduced. It becomes difficult to dissolve in water. On the other hand, when the pore diameter is smaller than 10 μm, hydrogen molecules (H ₂ ) cannot smoothly pass through the pores (sufficient gas permeability cannot be imparted to the platinum catalyst layer 32). Absent. Therefore, the average pore diameter of the platinum catalyst layer 32 is preferably in the range of 10 μm to 50 μm.

  The average value of pores (average pore diameter) can be obtained by, for example, a gas adsorption method. Measurement of the pore diameter (average pore diameter or pore diameter distribution) based on the gas adsorption method can be easily performed using, for example, a commercially available pore distribution measuring apparatus manufactured by Shimadzu Corporation. Alternatively, the pore diameter (average pore diameter or pore diameter distribution) may be measured using a surface analyzer.

  Note that, when hydrogen-dissolved water is collected from the cathode chamber 34 as in this embodiment, the raw water flow rate on the cathode side (arrow “80”) is made larger than the raw water flow rate on the anode side (arrow “81”). It is desirable. Specifically, the raw water flow rate on the cathode side is 0.5 L / min, whereas the raw water flow rate on the anode side is 0.1 L / min.

  By making the raw water flow rate on the cathode side larger than the raw water flow rate on the anode side in this way, the drainage amount on the anode side can be reduced, and hydrogen-dissolved water suitable for the purpose of this embodiment can be obtained at a favorable cost. Can be obtained. Further, by increasing the raw water flow rate on the cathode side in this way, a large flow pressure (water flow pressure, for example, 30 MPa) can be applied to the cathode surface. Therefore, it is possible to further promote the separation of hydrogen bubbles from the cathode surface.

  When collecting oxygen-dissolved water from the anode chamber 24, the raw water flow rate on the cathode side and the raw water flow rate on the anode side may be the same, or the raw water flow rate on the anode side is larger than the raw water flow rate on the cathode side. May be.

  Furthermore, the other characteristic part of the electrolyzed water generating apparatus 100 which concerns on this embodiment is demonstrated referring FIG. First, the characteristic part on the cathode side will be described.

  As described above, the cathode 30 is disposed in the cathode chamber 34 into which raw water is introduced. The cathode chamber 34 is connected to a hydrogen-dissolved water discharge path (upstream discharge path 60 and downstream discharge path 61) for discharging hydrogen-dissolved water that dissolves hydrogen generated from the cathode 30. The hydrogen-dissolved water discharge path includes a stirring unit 64 that stirs the discharged hydrogen-dissolved water. In this embodiment, the stirring means 64 is a spiral tube 64 that extends spirally from the cathode chamber 34. That is, a spiral tube 64 is provided in the middle of the upstream discharge path 60 of hydrogen-dissolved water (near the cathode chamber outlet in the figure), and the hydrogen-dissolved water is allowed to pass through the spiral tube 64, thereby stabilizing the stirring action. Can be obtained.

  According to such a configuration, the hydrogen bubbles remaining without being dissolved in the hydrogen-dissolved water (for example, bubbles that have grown and adhered to the cathode surface and then grown greatly) are reduced by stirring by the stirring means 64. In addition, hydrogen molecules contained in the hydrogen bubbles can be further dissolved. As a result, the dissolved hydrogen concentration of hydrogen-dissolved water can be increased more effectively.

  The spiral tube 64 only needs to have a shape (here, a spiral shape) that can appropriately stir the hydrogen-dissolved water passing through the tube, and its size is not particularly limited, but in the case of the structure shown in FIG. The tube diameter is preferably 2 mm to 4 mm, and the length is preferably 150 mm or more. The tube diameter and length of the spiral tube 64 can be appropriately changed according to the configuration of the electrolyzed water generator (for example, the raw water flow rate in the cathode chamber 34), the desired hydrogen concentration, and the like. Thereby, the stirring function suitable for the objective of this embodiment can be preferably given to the spiral tube 64.

  The hydrogen-dissolved water discharge path (upstream-side discharge path 60 and downstream-side discharge path 61) includes a concentration detection means 66 that detects the dissolved hydrogen concentration of the discharged hydrogen-dissolved water, and the detected dissolved hydrogen concentration is a predetermined concentration. When the amount is less than the above, the recirculation means 62 for recirculating the discharged hydrogen-dissolved water to the cathode chamber 34 is provided.

  In this embodiment, the concentration detection means 66 is a hydrogen concentration meter 66 installed in the downstream discharge path 61 of hydrogen-dissolved water. The hydrogen concentration meter 66 detects the dissolved hydrogen concentration of the hydrogen-dissolved water flowing through the downstream discharge path 61. The hydrogen concentration meter 66 is electrically connected to a control unit (not shown) and outputs information on the detected dissolved hydrogen concentration to the control unit.

  In this embodiment, the reflux means 62 is a reflux path 62 connected to the cathode side supply path 54. The upstream end of the reflux path 62 is connected to the upstream discharge path 60 via the electromagnetic valve 68. The electromagnetic valve 68 is electrically connected to a control unit (not shown) and, based on a switching command from the control unit, connects the upstream discharge path 60 between the downstream discharge path 61 side and the reflux path 62 side. By switching, the direction in which the hydrogen-dissolved water is discharged is switched between the arrow “84” direction and the arrow “88” direction.

  In such a configuration, when the dissolved hydrogen concentration detected by the hydrogen concentration meter 66 is less than a predetermined concentration (for example, 1 ppm or more), the control unit (not shown) switches the connection of the upstream discharge path 60 to the reflux path 62 side, Guide the dissolved water in the direction of arrow "88". The hydrogen-dissolved water introduced in the direction of the arrow “88” is returned to the cathode chamber 34 via the cathode-side supply path 54 and is subjected to electrolysis again in the cathode chamber. Thus, by repeating the reflux of the hydrogen-dissolved water through the reflux path 62, the dissolved hydrogen concentration of the hydrogen-dissolved water can be reliably increased.

  Thereafter, when the dissolved hydrogen concentration detected by the hydrogen concentration meter 66 satisfies a predetermined concentration (for example, 1 ppm or more), the control unit detects that the dissolved hydrogen concentration detected by the hydrogen concentration meter 66 is a predetermined concentration (for example, 1 ppm or more). When satisfy | filling, the connection of the upstream discharge path 60 is switched to the downstream discharge path 61 side, and hydrogen dissolved water is guide | induced to the arrow "84" direction. The hydrogen-dissolved water guided in the direction of the arrow “84” is discharged to the outside through the outlet cock 69, whereby a hydrogen-dissolved water having a predetermined concentration (for example, 1 ppm or more) can be obtained.

  Thus, by repeating the reflux of the hydrogen-dissolved water through the reflux path 62, the dissolved hydrogen concentration of the hydrogen-dissolved water can be reliably increased, and the electrolysis having a desired dissolved hydrogen concentration (for example, 1 ppm or more). Water (hydrogen-dissolved water) can be obtained reliably and stably. When the hydrogen-dissolved water is refluxed to the reflux path 62, the raw water flowing in the raw water supply path 50 (raw water fed from the pump) may be temporarily stopped. Thereby, the dissolved hydrogen concentration of the refluxed hydrogen-dissolved water can be concentrated and increased.

  Subsequently, the characteristic part on the anode side will be described.

  As described above, the anode 20 is disposed in the anode chamber 24 into which raw water is introduced. In this embodiment, an oxygen-dissolved water discharge path 70 for discharging oxygen-dissolved water that dissolves oxygen is connected to the anode chamber 24. The oxygen-dissolved water discharge path 70 includes separation means 72 that separates oxygen from the discharged oxygen-dissolved water.

  In this embodiment, the separation means 72 is a gas-liquid separation tank 72 installed in the middle of the oxygen-dissolved water discharge path 70. The gas-liquid separation tank 72 has a gas discharge valve 74, and the degassed oxygen gas is discharged from the gas discharge valve 74. As the gas-liquid separation tank 72, for example, a deoxygenation separation pipe that performs gas-liquid separation by a cyclone method can be preferably used. Alternatively, a gas separation membrane (for example, a silicon membrane as an oxygen permeable polymer membrane) may be used as the separation means 72. And the downstream end of the oxygen dissolved water discharge path 70 provided with such a separation means 72 is connected to the raw water supply path 50 which introduces raw water into the electrolytic cell.

  According to such a configuration, when oxygen-dissolved water is not collected from the anode chamber 24 as in this embodiment, oxygen-dissolved water (substantially oxygen-dissolved water from which oxygen has been removed) after separating oxygen is used. By reintroducing it into the raw water supply path 50 (arrow “83”), it can be reused as raw water. Thereby, the amount of drainage on the anode side can be further reduced.

  A modified example of the electrolyzed water generating apparatus of this embodiment will be described with reference to FIGS. 3 and 4. This modified example is different from the above-described embodiment in that the anode 20 and the cathode 30 are arranged in direct contact with the diaphragm 40. Therefore, the same components as those in the electrolyzed water generating apparatus 100 are denoted by the same reference numerals, and redundant description thereof is omitted.

  As shown in FIG. 3, in the electrolyzed water generating apparatus 200 (modified example), the anode 20 and the cathode 30 are disposed in direct contact with the diaphragm 40 without the mesh insulators 42a and 42b interposed therebetween. In this example, the anode 20 has a hollow cylindrical shape, the diaphragm 40 has a hollow cylindrical shape whose diameter is smaller than that of the anode 20, and the cathode 30 has a hollow cylindrical shape whose diameter is smaller than that of the diaphragm 40. Then, a diaphragm 40 having a small diameter is inserted into the anode 20 having a large diameter, and a cathode 30 having a smaller diameter is inserted into the diaphragm 40, so that the inner peripheral surface of the anode 20 and the outer peripheral surface of the cathode 30 form the diaphragm 40. They are arranged so as to face each other.

As the diaphragm 40, a cation exchange membrane capable of transmitting at least hydrogen ions (H ⁺ ) can be used. Here, from the viewpoint of heat resistance and chemical corrosion resistance, a fluororesin-based (for example, Teflon) film is preferably used.

  The anode 20 and the cathode 30 can be made of a material having gas and liquid permeability. Examples of such a material include a porous metal plate and a punching metal plate. Further, as shown in FIG. 4, platinum catalyst layers 22 and 32 mainly composed of platinum are formed on the surfaces of the anode 20 and the cathode 30, and the platinum catalyst layers 22 and 32 have an average pore diameter of 50 μm. The following pores are formed.

  In the electrolyzed water generating apparatus 200 configured as described above, raw water (e.g., neutral water such as purified water) is introduced into the anode chamber 24 and the cathode chamber 34 in the electrolytic cell 10 and a DC voltage is applied between the anode 20 and the cathode 30. Then, the water in contact with the anode 20 and the cathode 30 is electrolyzed and the electrolytic reaction proceeds.

This electrolytic reaction first proceeds at the interface between the anode 20 and the diaphragm 40. That is, as shown in FIG. 4, on the surface of the anode 20 on the diaphragm 40 side, water molecules (H ₂ O) emit electrons, thereby generating oxygen molecules (O ₂ ) and hydrogen ions (H ⁺ ), The generated oxygen molecules (O ₂ ) are released as bubbles into the anode chamber 24 through the anode 20. In addition, the generated hydrogen ions (H ⁺ ) are electrically repelled from the anode 20 and move toward the diaphragm 40. Then, it moves through the diaphragm 40 and reaches the surface of the cathode 30 on the diaphragm 40 side.

Then, on the surface of the cathode 30 on the diaphragm 40 side, hydrogen ions (H ⁺ ) that have moved from the anode side receive electrons to generate hydrogen molecules (H ₂ ), and the generated hydrogen molecules (H ₂ ) Bubbles are discharged through the cathode 30 to the cathode chamber 34. At this time, hydrogen molecules (H ₂ ) become bubbles and are released through the pores of the platinum catalyst layer 32 (micropores having an average pore diameter of 50 μm or less), so that the generated hydrogen bubbles are made very small. Can do. Therefore, also in the configuration of the electrolyzed water generating apparatus 200 shown in FIGS. 3 and 4, the generated hydrogen bubbles can be made extremely small, and the dissolved hydrogen concentration of the hydrogen-dissolved water can be efficiently increased.

In addition, according to the above configuration, hydrogen ions (H ⁺ ) generated at the interface between the anode 20 and the diaphragm 40 are consumed during the electrolysis, and hydrogen molecules (H ⁺ ) are generated at the interface between the cathode 30 and the diaphragm 40. Since H ₂ ) is generated, the by-product hydroxide ion (OH ⁻ ) is not generated. Therefore, it is possible to reliably avoid an increase in the pH value of the electrolyzed water (hydrogen-dissolved water). As a result, it is possible to collect hydrogen-dissolved water having a high dissolved hydrogen concentration around pH 7.5 suitable for drinking it can.

  In the electrolyzed water generating apparatus 200, a holding member 26 that holds raw water introduced inside the anode chamber is disposed in the anode chamber 24. In the illustrated example, the holding member 26 is a porous sheet 26 disposed in contact with the outer surface of the anode 20. The porous sheet 26 has pores capable of holding raw water. According to such a configuration, by holding the raw water introduced into the anode chamber by the holding member (porous sheet) 22, the state in which the diaphragm 40 is wet with water can be stabilized while suppressing the raw water flow rate on the anode side. Can be kept. Thereby, electrolysis (particularly, electrolysis on the anode side) can be stably performed while reducing the amount of drainage on the anode side.

  In addition, as a porous sheet 26 mentioned above, a nonwoven fabric can be used conveniently, for example. Generally, a nonwoven fabric has a high porosity (typically 40% or more, for example, 50 to 70%), and can realize high liquid water retention performance (liquid water retention capacity). Alternatively, a water-absorbing resin film or a foam metal may be used instead of the nonwoven fabric. Thereby, the holding function suitable for the object of the present invention can be given to the porous sheet 26.

Furthermore, it is desirable that the porous sheet 26 has pores that can pass oxygen (O ₂ ). According to such a configuration, oxygen (O ₂ ) generated at the interface between the anode 20 and the diaphragm 40 can be quickly released into the anode chamber 24 through the pores of the holding member 26 (for example, a nonwoven fabric). it can. Thereby, it is possible to avoid a situation where oxygen bubbles generated on the surface of the anode 20 adhere to the anode surface and grow, and an increase in electrolytic resistance can be preferably suppressed.

  Then, the manufacturing method of the member for electrodes which concerns on this embodiment (electrode member used in order to produce | generate electrolyzed water) is demonstrated, referring FIG.

  As described above, the electrode member according to this embodiment includes an electrode material mainly composed of a conductive metal and a platinum catalyst layer formed on the surface of the electrode material. Fine pores having a pore diameter of 50 μm or less (preferably 10 μm or more) are formed.

  As shown in FIG. 5, the electrode member including the electrode material coated with the platinum catalyst layer includes a preparation step (step S <b> 10) for preparing an electrode material mainly composed of a conductive metal, and the prepared electrode material. Coating step (step S20) for applying a catalyst-forming coating solution containing hexachloroplatinic acid to the surface of the substrate, and a firing step (step S30) for firing the electrode material coated with the catalyst-forming coating solution using dry steam at a predetermined temperature. ), And. This will be described in detail below.

  First, in the preparation step (step S10), an electrode material mainly composed of a conductive metal is prepared. In this embodiment, a titanium material is prepared as an electrode material.

  Specifically, a titanium metal plate is prepared (for example, purchased), and then the prepared titanium plate is degreased and cleaned, and then washed with pure water and dried. Next, the dried titanium material is subjected to pitting cleaning (for example, using an oxalic acid aqueous solution having a concentration of 10% and about 100 ° C.), and then the titanium material is further etched. This etching process can be performed, for example, by immersing the titanium material in dilute sulfuric acid for 5 hours. By performing the etching process on the titanium material in this way, the surface area of the titanium material is increased and the thermal oxide film formed on the surface of the titanium plate can be removed. Thereafter, the etched titanium material is washed with water (preferably with ion exchange water), dried, and then stored in an environment where oxidation can be prevented. In this way, the preparation process can be performed.

  Next, in the coating process (step S20), a catalyst-forming coating solution containing hexachloroplatinic acid is applied to the surface of the prepared electrode material. In this embodiment, a catalyst-forming coating solution containing hexachloroplatinic acid and hexachloroiridium acid is prepared and applied to the electrode material (here, titanium material) surface.

  Specifically, the catalyst-forming coating solution is prepared by mixing, for example, a hexachloroplatinic acid compound, a hexachloroiridate compound, and a solution capable of dissolving the hexachloroplatinate compound and the hexachloroiridate compound. This can be done by preparing a liquid and adjusting it to an appropriate viscosity. In this example, hexachloroplatinic acid compound and hexachloroiridate compound are weighed so as to have a predetermined Pt / Ir ratio (7: 3 in this example), and mixed in a butanol solution to form a catalyst-forming coating. Adjust the liquid.

  Then, a catalyst-forming coating solution is applied to the surface of the electrode material (here, titanium material). The method for applying the catalyst-forming coating solution to the electrode material surface is not particularly limited. In this embodiment, the electrode material is immersed (dipped) in the catalyst-forming coating solution (for example, dip coating method). According to such a method, a uniform coating liquid film can be formed on both surfaces of the electrode material. In addition, you may apply | coat the coating liquid for catalyst formation only to the single side | surface of an electrode material as needed. Moreover, you may add another additive to the coating liquid for catalyst formation as needed. Thereafter, the electrode material on which the liquid film is formed is naturally dried for about 10 minutes using, for example, a vacuum desiccator. In this way, the coating process can be performed.

  Next, in the firing step (step S30), the electrode material coated with the catalyst-forming coating liquid (particularly the liquid film formed on the electrode material surface) is fired. Firing of this electrode material (particularly a liquid film formed on the surface of the electrode material) is performed using dry steam at a predetermined temperature.

Here, “dry steam” in this specification is so-called superheated steam, that is, steam heated to a high temperature exceeding 100 ° C. by adding further heat to saturated steam evaporated at 100 ° C. . Such superheated steam contains almost no oxygen in the steam, and therefore can be fired in an atmosphere close to a reducing gas. Therefore, when the liquid film on the electrode material (coating liquid containing hexachloroplatinic acid) is baked using superheated steam, the hexachloroplatinic acid can be heated and reduced without being oxidized. In addition, fine slit-shaped cracks (cracks) can be formed on the surface of the produced platinum catalyst layer by an appropriate steam pressure (about 2 × 10 ⁵ Pa in this example) possessed by superheated steam. It is possible to easily and stably form pores (pores having an average pore diameter of 10 μm to 50 μm) suitable for the purpose of the form.

  In this embodiment, firing of an electrode material (particularly a liquid film formed on the electrode material surface) using dry steam (superheated steam) is performed in two stages.

  Specifically, first, a first baking process is performed in which the applied electrode material (coating liquid containing hexachloroplatinic acid) is baked with dry steam at a predetermined temperature (step S32), and then the temperature is higher than that of the first baking process. A second baking process for baking is performed (step S34). In this example, first, the applied electrode material is baked for 10 minutes with dry steam of 250 ° C. to 300 ° C., and then the steam temperature is increased to 530 ° C. and baking is further performed for 10 minutes. In this way, the coating process can be performed.

  By the baking treatment described above, the liquid film (coating liquid containing hexachloroplatinic acid) formed on the electrode material is fired, whereby a platinum catalyst layer mainly composed of platinum can be formed thinly. And the platinum catalyst layer on an electrode material is gradually thickened by repeating the application | coating process (step S20) mentioned above and a baking process (step S30) predetermined times (n times).

  In this embodiment, the above-described coating operation and baking operation are repeated 60 to 70 times over about 30 hours, whereby the platinum catalyst layer on the electrode material is gradually thickened so that the platinum catalyst layer has a predetermined thickness. To do. In this manner, the platinum catalyst layer can be formed on the surface of the electrode material, and the production of the electrode member including the electrode material coated on the platinum catalyst layer is completed (step S40).

  According to the manufacturing method described above, in the firing step (step S30), the catalyst forming coating liquid is fired using high-temperature dry steam (superheated steam). A micro-order porous (preferably pores having an average pore diameter of 10 μm to 50 μm) suitable for the purpose of the embodiment can be preferably (easily and stably) formed.

  Moreover, in a baking process (step S30), a fine slit-shaped crack (crack) can be formed in the surface of a platinum catalyst layer by using high temperature dry steam (superheated steam). Thereby, the surface area of the platinum catalyst layer can be increased, and the catalytic activity area can be increased (for example, compared with a platinum catalyst layer formed by a typical plating process). As a result, the amount of platinum used to produce the platinum catalyst layer can be reduced, and the production cost can be reduced.

  Further, in this embodiment, the platinum catalyst layer on the electrode material is gradually thickened by repeating the coating process (step S20) and the baking process (step S30) a predetermined number of times. Thereby, the produced platinum catalyst layer can be provided with chemical stability and a catalyst loading amount suitable for the purpose of the present embodiment, and the service life of the platinum catalyst layer can be improved.

  Furthermore, in this embodiment, in the firing step (step S30), firing of the electrode material (particularly the liquid film formed on the electrode material surface) using dry steam (superheated steam) is performed in two stages. Thereby, it is possible to prevent impurities (for example, nitrogen oxides derived from air) from being mixed into the platinum catalyst layer as the final product.

  That is, impurities (for example, nitrogen oxides derived from air) that can be mixed into the platinum catalyst layer during the first firing process can be burned out by the second firing process at a higher temperature. As a result, the purity of the platinum catalyst layer can be improved, and troublesome work such as cleaning after firing is not necessary.

  In the above-described example, the catalyst-forming coating solution contains hexachloroiridate in addition to hexachloroplatinic acid. As a result, the platinum catalyst layer as the final product has its skeleton formed in a state where platinum (Pt) and iridium (Ir) are mixed. Thus, favorable catalyst activity can be obtained by mixing iridium in the platinum catalyst layer (making iridium-rich blending). In addition, since iridium is less expensive than platinum, the cost can be reduced.

  As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible.

For example, in the above-described example, a case where a titanium material is used as the electrode material has been described, but the present invention is not limited thereto, and other electrode materials may be used. For example, a nickel magnesium alloy can be used as the electrode material. In this case, it is preferable to form a perovskite-based mineral (for example, an iron oxide compound such as hematite (Fe ₂ O ₃ ) or magnetite (Fe ₃ O ₄ )) on the surface of the nickel magnesium alloy by firing, and the perovskite A platinum catalyst layer can be formed on the base mineral. According to such a configuration, the electrode material becomes porous and the surface area increases, so that the electrode size can be reduced.

  Moreover, although the example which extract | collected hydrogen dissolved water with high dissolved hydrogen concentration from the cathode chamber was shown in the example mentioned above, you may comprise an electrolyzed water generating apparatus so that oxygen dissolved water may be extract | collected from an anode chamber, for example. Even when oxygen-dissolved water is collected from the anode chamber, a platinum catalyst layer mainly composed of platinum is formed on the anode surface, and pores having an average pore diameter of 50 μm or less are formed in the gold catalyst layer. It is possible to collect oxygen-dissolved water having a high dissolved oxygen concentration from the chamber.

The schematic diagram which shows the structure of the electrolyzed water generating apparatus 100 typically. The principal part enlarged view which expanded and showed the principal part of the electrolytic cell 10 of FIG. The schematic diagram which shows the structure of the electrolyzed water generating apparatus 200 typically. The principal part enlarged view which expanded and showed the principal part of the electrolytic cell 10 of FIG. The flowchart which shows the manufacture flow of the member for electrodes.

Explanation of symbols

10 Electrolytic cell 20 Electrode 20 Anode 22 Platinum catalyst layer (anode side)
24 Anode chamber 26 Holding member (porous sheet)
30 Cathode 32 Platinum catalyst layer (cathode side)
34 Cathode chamber 40 Diaphragm 42a Reticulated insulator (anode side)
42b Reticulated insulator (cathode side)
50 Raw water supply path 52 Anode side supply path 54 Cathode side supply path 60 Upstream discharge path 61 Downstream discharge path 62 Reflux means (reflux path)
64 Stirring means (spiral tube)
66 Concentration detection means (hydrogen concentration meter)
68 Solenoid valve 69 Outlet cock 70 Oxygen-dissolved water discharge path 72 Separation means (gas-liquid separation tank)
74 Gas discharge valve 90 Wall surface 100 Electrolyzed water generator 200 Electrolyzed water generator

Claims (13)

An electrolyzed water generating device that electrolyzes raw water to generate electrolyzed water,
An anode and a cathode to which the raw water is supplied;
A diaphragm disposed between the anode and the cathode,
A platinum catalyst layer mainly composed of platinum which is a noble metal element is formed on the surface of at least one of the anode and the cathode,
An electrolyzed water generating apparatus characterized in that pores having an average pore diameter of 50 μm or less are formed in the platinum catalyst layer.   The electrolyzed water generating apparatus according to claim 1, wherein the platinum catalyst layer is formed by firing a platinum compound containing hexachloroplatinic acid with dry steam at a predetermined temperature. The cathode is disposed in a cathode chamber into which the raw water is introduced;
A hydrogen-dissolved water discharge path for discharging hydrogen-dissolved water that dissolves hydrogen generated from the cathode is connected to the cathode chamber,
The electrolyzed water generating apparatus according to claim 1, wherein the hydrogen-dissolved water discharge path includes a stirring unit that stirs the discharged hydrogen-dissolved water.   The electrolyzed water generating apparatus according to claim 3, wherein the stirring means is a spiral tube provided in the middle of the hydrogen-dissolved water discharge path. The hydrogen-dissolved water discharge route is
Hydrogen concentration detection means for detecting the dissolved hydrogen concentration of the discharged hydrogen-dissolved water;
5. The electrolyzed water generating device according to claim 3, further comprising: a reflux unit configured to reflux the discharged hydrogen-dissolved water to the cathode chamber when the detected dissolved hydrogen concentration is less than a predetermined concentration. . The anode is disposed in an anode chamber into which the raw water is introduced;
6. The electrolyzed water generating apparatus according to claim 1, wherein a holding member that holds the introduced raw water is disposed in the anode chamber.   The electrolyzed water generating apparatus according to claim 6, wherein the holding member that holds the raw water is a porous sheet disposed in contact with the outer surface of the anode. The anode is disposed in an anode chamber into which the raw water is introduced;
An oxygen-dissolved water discharge path for discharging oxygen-dissolved water that dissolves oxygen generated from the anode is connected to the anode chamber,
The electrolyzed water generating apparatus according to claim 1, wherein the oxygen-dissolved water discharge path includes a separation unit that separates oxygen from the discharged oxygen-dissolved water. An electrode member used for generating electrolyzed water,
An electrode material mainly composed of a conductive metal;
A platinum catalyst layer mainly formed of platinum which is a noble metal element, formed on the surface of the electrode material,
An electrode member, wherein pores having an average pore diameter of 50 μm or less are formed in the platinum catalyst layer.   The electrode member according to claim 9, wherein the platinum catalyst layer is formed by baking a platinum compound containing hexachloroplatinic acid with dry steam at a predetermined temperature. It is a manufacturing method of the member for electrodes used in order to produce electrolyzed water,
A step of preparing an electrode material mainly composed of a conductive metal;
An application step of applying a catalyst-forming application liquid containing hexachloroplatinic acid to the surface of the prepared electrode material;
Firing the electrode material coated with the catalyst-forming coating solution, and forming a platinum catalyst layer mainly composed of platinum on the surface of the electrode material,
In the firing step, the firing is performed using dry steam at a predetermined temperature. The firing step includes
A first firing process for firing the electrode material with dry steam at a predetermined temperature;
The manufacturing method of Claim 11 including the 2nd baking process baked with dry steam still higher temperature than the said 1st baking process.   The manufacturing method according to claim 11 or 12, wherein the catalyst-forming coating solution further contains hexachloroiridium acid.

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