Abstract: An organic hydride production apparatus includes: an electrolyte membrane having proton conductivity; a cathode that includes a cathode catalyst layer used to hydrogenate a hydrogenation target substance using protons to produce an organic hydride and also includes a cathode chamber; an anode that includes an anode catalyst layer used to oxidize water to produce protons and also includes an anode chamber; and a gas introduction unit that introduces, into the anolyte at a certain position, a certain gas used to remove at least one of the hydrogenation target substance and the organic hydride that have passed through the electrolyte membrane and been mixed into the anolyte.

Abstract: Provided is an electrolytic apparatus capable of pressurizing hydrogen gas produced by the electrolytic apparatus and removing impurities in the produced hydrogen gas. In the electrolytic apparatus, gas compression means 101 including an ejector 110, a storage tank 103 storing a circulation liquid, a circulation pipe 105 circulating a fluid mixture of hydrogen gas and the circulation liquid to the ejector, and a circulation pump 104 is provided in a discharge line 12 for hydrogen gas produced by electrolysis, a hydrogen gas discharge pipe 106 and a first valve V1 are provided in the storage tank 103, impurities in the hydrogen gas are transferred to the circulation liquid to remove the impurities from the hydrogen gas, and a pressure of the hydrogen gas stored in the storage tank 103 is raised by controlling a flow rate of the circulation liquid circulated from the storage tank 103 to the ejector 110 and opening and closing of the first valve V1.

Abstract: An organic hydride production apparatus includes: an electrolyte membrane having proton conductivity; a cathode, provided on one side of the electrolyte membrane, that contains a cathode catalyst used to hydrogenate a hydrogenation target substance using protons to produce an organic hydride; an anode, provided opposite to the one side of the electrolyte membrane, that contains an anode catalyst used to oxidize water to produce protons; and an anode support, provided opposite to the electrolyte membrane side of the anode, that supports the anode. The anode support is formed of an elastic porous body of which the Young's modulus is greater than 0.1 N/mm2 and less than 43 N/mm2.

Abstract: An apparatus (100) for producing an acidic aqueous solution includes: an electrodialyzer (110) that has a monovalent ion perm-selective ion-exchange membrane and separates wastewater containing chloride ions and alkali metal ions into electrodialysis concentrated water and electrodialysis diluted water by an electrodialysis treatment; an electrolyzer (120) includes an anode that that electrolyzes the electrodialysis concentrated water to produce an acidic aqueous solution; and a first circulator (13) that circulates at least some of the acidic aqueous solution to the wastewater supplied to the electrodialyzer (110), and that adjusts a pH of the wastewater supplied to the electrodialyzer to 3 to 9.

Abstract: An object of the present invention is to provide an electrolysis technique such that the electrolysis performance is unlikely to be deteriorated, and excellent catalytic activity is retained stably over a long period of time even when electric power having a large output fluctuation, such as renewable energy, is used a power source, and this object is realized by an alkaline water electrolysis method, in which an electrolytic solution obtained by dispersing a catalyst containing a hybrid cobalt hydroxide nanosheet (Co-NS) being a composite of a metal hydroxide and an organic substance is supplied to an anode chamber and a cathode chamber that form an electrolytic cell, and the electrolytic solution is used for electrolysis in each chamber in common, and an alkaline water electrolysis anode.

Abstract: The chamber frame element of the present invention, which has a smaller amount of voltage drop, consumes less reactive power than the prior art, and exhibits no metal corrosion, is a chamber frame element (14) for an electrolyzer or an electrodialysis cell. The chamber frame element (14) includes: a bag body (141); a frame (142) housed in an interior space of the bag body (141); and an inlet (143) and an outlet (144) to which piping can be attached, which are formed on the outer side of a region where the frame is housed in the bag body (141).

Abstract: The chamber frame element of the present invention, which has a smaller amount of voltage drop, consumes less reactive power than the prior art, and exhibits no metal corrosion, is a chamber frame element (14) for an electrolyzer or an electrodialysis cell. The chamber frame element (14) includes: a bag body (141); a frame (142) housed in an interior space of the bag body (141); and an inlet (143) and an outlet (144) to which piping can be attached, which are formed on the outer side of a region where the frame is housed in the bag body (141).

Abstract: To provide an electrolysis cell for producing an organic chemical hydride capable of advancing a reduction reaction in a cathode of an organic compound having an unsaturated bond with high current efficiency and a small electric power consumption unit.

Abstract: An organic hydride production apparatus that enables the reduction reaction at the cathode of an organic compound having an unsaturated bond to proceed at high current efficiency and at a low electric power consumption rate, and a method for producing an organic hydride that uses this production apparatus.

Abstract: A diaphragm includes a porous supporting body and a polymer porous membrane. When one of surfaces of the porous membrane is defined as a surface A, the other surface opposite to the surface A is defined as a surface B, a section of the porous membrane parallel to the surfaces A and B is defined as a section C, an average pore diameter on the surface A is defined as an average pore diameter DA, an average pore diameter on the surface B is defined as an average pore diameter DB, and an average pore diameter on the section C is defined as an average pore diameter DC, the average pore diameters DA and DB are substantially equal to each other, and the average pore diameter DC is larger than each of the average pore diameters DA and DB.

Abstract: An anode for oxygen evolution that operates at a small overpotential and in a stable manner, and can be used favorably in an organic chemical hydride electrolytic synthesis apparatus. An anode 10 for oxygen evolution that evolves oxygen in a sulfuric acid aqueous solution containing a substance to be hydrogenated dissolved at a concentration higher than 1 mg/L, wherein an anode substrate 10a is composed of a valve metal, and an anode catalyst layer 10b containing at least one oxide, nitride or carbide of iridium, and at least one oxide, nitride or carbide of at least one metal selected from the group consisting of elements belonging to groups 4, 5 and 13 of the periodic table is formed on the surface of the anode substrate 10a.

Abstract: A sacrificial electrode attachment structure includes: a first pipe in which electrolyte flows; a second pipe which is formed of an insulating material and allows the electrolyte to flow; a cylindrical sacrificial electrode unit arranged between the first pipe and the second pipe so as to allow the electrolyte to flow, and including a sacrificial electrode that contacts the electrolyte; a first pipe joint adapted to liquid-tightly connect the first pipe to the sacrificial electrode unit in a detachable manner; and a second pipe joint adapted to liquid-tightly connect the second pipe to the sacrificial electrode unit in a detachable manner.

Abstract: The claimed invention provides an economical cathode for electrolysis and a method of manufacturing the same. The cathode includes a conductive base and a catalyst layer including a catalyst component. The conductive base, e.g. a wire mesh, includes plural intersection portions and is made of nickel. The cathode catalyst layer includes a catalyst component, such as platinum, and is formed by applying an application liquid to the base and drying and solidifying the liquid. The solidified portion of the applied liquid is not formed in the intersection portions of the base, or even if formed, the cross-sectional shape of the solidified portion has mesh-shaped pores with an average porosity of 15% or larger. The base is prepared by preheating to a temperature from 43° C. to 120° C. immediately before applying the application liquid, and thereafter the cathode catalyst layer is formed.

Abstract: Provided is a method capable of producing, in a simple and low-cost manner, an electrolysis electrode which can be used in alkaline water electrolysis and has superior durability against output variation. The method for producing an anode for alkaline water electrolysis includes: a step of dissolving lithium nitrate and a nickel carboxylate in water to prepare an aqueous solution containing lithium ions and nickel ions, a step of applying the aqueous solution to the surface of a conductive substrate having at least the surface composed of nickel or a nickel-based alloy, and a step of subjecting the conductive substrate to which the aqueous solution has been applied to a heat treatment at a temperature within a range from at least 450° C. to not more than 600° C., thereby forming a catalyst layer composed of a lithium-containing nickel oxide on the conductive substrate.

Abstract: Provided are an electrolyzer having excellent durability against reverse current. The electrolyzer 300 includes an anode 314, an anode chamber 310 housing the anode 314, a cathode 330, a cathode chamber 320 housing the cathode 330, and a diaphragm that separates the anode chamber 310 and the cathode chamber 320, wherein a reverse current absorption body 334 formed of a sintered compact containing nickel is disposed in at least one of an inside of the cathode chamber 320 and an inside of the anode chamber 310, and the reverse current absorption body 334 is not directly coupled to the cathode 330 and the anode 314 but is electrically connected to at least one of the cathode 330 and the anode 314.

Abstract: Provided is a water treatment system using an alkaline water electrolytic device and an alkaline fuel cell in which for continuing an electrolytic treatment, a hydrogen gas and an oxygen gas required in an alkaline water electrolytic device and an alkaline fuel cell, an amount of water corresponding to raw water lost through the electrolytic treatment, and an electrolytic solution are efficiently circulated and used in a water treatment system to considerably reduce electric power consumption.

Abstract: Provided are an anode for alkaline water electrolysis that can achieve a low overpotential at low cost, and a method for producing the anode for alkaline water electrolysis. An anode for alkaline water electrolysis having electrode catalyst layers 2, 3 composed of a first catalyst component having either a nickel-cobalt spinel oxide or a lanthanide-nickel-cobalt perovskite oxide and a second catalyst component having at least one of iridium oxide and ruthenium oxide formed on the surface of a conductive substrate 1 composed of nickel or a nickel-based alloy, and a method for producing the anode for alkaline water electrolysis.

Abstract: Provided is an alkaline water electrolysis method capable of reducing or preventing degradation in cathode and anode performance even in an operation of repeated cycles of frequent starting and stopping, and/or even in an operation involving a significant output variation.

Abstract: Provided are an electrode for electrolysis having excellent durability against reverse current, and a method that enables production of the electrode for electrolysis at low cost. The electrode for electrolysis 130 includes a conductive substrate 132 on which a catalyst layer is formed, and a reverse current absorption body 134 that is coupled to the conductive substrate 132 in a detachable manner, wherein the reverse current absorption body 134 is formed from a sintered compact containing nickel. The method for producing the electrode for electrolysis 130 includes a sintered compact formation step of obtaining the sintered compact by sintering a raw material powder composed of any one of Raney nickel alloy particles containing nickel and an alkali-soluble metal element, metallic nickel particles, and a mixture of Raney nickel alloy particles and metallic nickel particles, and a coupling step of coupling the sintered compact to the conductive substrate 132.

Abstract: An organic hydride production apparatus includes: an electrolyte membrane having proton conductivity; a cathode, provided on one side of the electrolyte membrane, that contains a cathode catalyst used to hydrogenate a hydrogenation target substance using protons to produce an organic hydride; an anode, provided opposite to the one side of the electrolyte membrane, that contains an anode catalyst used to oxidize water to produce protons; and an anode support, provided opposite to the electrolyte membrane side of the anode, that supports the anode. The anode support is formed of an elastic porous body of which the Young's modulus is greater than 0.1 N/mm2 and less than 43 N/mm2.