An electrolysis element for alkaline water electrolysis includes: an electroconductive separating wall including a first face and a second face; an anode for generating oxygen; a cathode for generating hydrogen; a first connecting means fixing the anode to the separating wall such that the anode faces the first face of the separating wall at a first distance, and electrically connecting the anode to the separating wall; an electroconductive elastic body supporting the cathode; and a cathode current collector supporting the elastic body, the cathode current collector being fixed to the separating wall, to face the second face of the separating wall at a second distance, and being electrically connected to the separating wall, the first connecting means including: an electroconductive bolt including at least a shaft, wherein the anode is removably fixed to the separating wall by means of the electroconductive bolt.

Methods and systems related to the field of electrolyzers are disclosed. An electrolyzer assembly is disclosed which includes a stack of cells, a plurality of polar plates in the stack of cells, a plurality of flow fields between the plurality of polar plates, a conduit fluidly connecting flow fields in the plurality of flow fields, an electrically conductive fluid in the conduit, a plurality of insulating layers arranged between a conductive surface of the plurality of flow fields and the conduit, and a plurality of openings in the plurality of insulating layers providing a plurality of fluid connections between the conduit and the plurality of flow fields.

Methods and systems related to the field of electrolyzers are disclosed. An electrolyzer assembly is disclosed which includes a stack of cells, a plurality of polar plates in the stack of cells, a plurality of flow fields between the plurality of polar plates, a conduit fluidly connecting flow fields in the plurality of flow fields, an electrically conductive fluid in the conduit, a plurality of insulating layers arranged between a conductive surface of the plurality of flow fields and the conduit, and a plurality of openings in the plurality of insulating layers providing a plurality of fluid connections between the conduit and the plurality of flow fields.

An electrolysis system of the present disclosure includes an electrolyzer which includes an electrode to generate a gas from the electrode, and a tightening device which controls a tightening load on the electrolyzer in accordance with a pressure of the gas.

A system for hydrogen recovery includes a dryer having an inlet that may be fluidly connected to a hydrogen outlet of a hydrogen generator, a hydrogen using device having an inlet fluidly connected to a dry hydrogen outlet of the dryer, and one or more conduits fluidly connecting a wet hydrogen outlet from the dryer and an impure hydrogen exhaust outlet of the hydrogen using device to the inlet of the dryer.

An electrochemical cell comprising an anode, an electrolyte adjacent to the anode, a cathode adjacent to the electrolyte, and an interconnector adjacent to the cathode. One or more of the anode, the cathode, and the interconnector comprises a ternary oxide material comprising the chemical formula of M.sup.1.sub.xM.sup.2.sub.yO.sub.z, where M.sup.1 is an alkali metal element or an alkaline earth metal element, M.sup.2 is a platinum group metal, each of x and y is independently an integer less than or equal to 2, and z is independently an integer less than or equal to 4. A system comprising one or more electrochemical cells and methods of forming the ternary oxide material are also disclosed.

An electrolysis cell includes an anode chamber and a cathode chamber separated by an ion-exchange membrane. The electrolysis cell includes an anode, a cathode, and a cathode current distributor. The anode, the ion-exchange membrane, the cathode, and the cathode current distributor are in direct touching contact in the mentioned order. Flexibly resilient holding elements are arranged on the other side of the anode and/or on the other side of the cathode current distributor. The flexibly resilient holding elements exert a contact pressure on the anode and/or on the cathode current distributor. The flexibly resilient holding elements have annular elements, the axis of which is oriented in the height direction of the electrolysis cell. By means of the flexibly resilient and in part also plastically deforming annular elements, effective mechanical contact pressure of the ion-exchange membrane against the oxygen-depolarized cathode is achieved.

An electrolysis cell includes an anode chamber and a cathode chamber separated by an ion-exchange membrane. The electrolysis cell includes an anode, a cathode, and a cathode current distributor. The anode, the ion-exchange membrane, the cathode, and the cathode current distributor are in direct touching contact in the mentioned order. Flexibly resilient holding elements are arranged on the other side of the anode and/or on the other side of the cathode current distributor. The flexibly resilient holding elements exert a contact pressure on the anode and/or on the cathode current distributor. The flexibly resilient holding elements have annular elements, the axis of which is oriented in the height direction of the electrolysis cell. By means of the flexibly resilient and in part also plastically deforming annular elements, effective mechanical contact pressure of the ion-exchange membrane against the oxygen-depolarized cathode is achieved.

An electrolyzer stack is configured for high-speed manufacturing and assembly of a plurality of scalable electrolysis cells. Each cell comprises a plurality of water windows configured to maintain a pressure loss, temperature rise and/or oxygen outlet volume fraction below predetermined thresholds. Repeating components of the cells are configured based on a desired roll web width for production and a stack compression system is configured to enable a variable quantity and variable area of said repeating cells in a single stack. A high-speed manufacturing system is configured to produce scalable cells and assemble scalable stacks at rates in excess of 1,000 MW-class stacks per year.

[Problem] To provide a stacked structure including electrodes that can effectively prevent misalignment between units. [Solution] A stacked structure 2 including electrodes 232, 332, 412, 233, 333, 422, wherein multiple units 23, 33, 24, 41, 42 including flat units are stacked and fastened by fasteners 25, the respective units 23, 33, 24, 41, 42 comprising frame-shaped fastening portions 237a, 237b, 337a, 337b, 247a, 247b, 417a, 417b, 427a, 427b on outer peripheral portions on both surfaces thereof, being stacked by the surfaces of the respective fastening portions 237a, 237b, 337a, 337b, 247a, 247b, 417a, 417b, 427a, 427b being pressed against each other, and being formed so that the width of fastening portions 247a, 247b, 337a, 337b, 427a, 427b on one unit is different from the width of fastening portions 237a, 237b, 417a, 417b on another unit.