A bipolar membrane comprising a first member comprising at least one anion exchange material; a second member comprising at least one cation exchange material, wherein the first member and the second member together form an interface junction; and disposed within the interface junction a first layer comprising a first water dissociation catalyst and a second layer comprising a second water dissociation catalyst, wherein the first water dissociation catalyst is different than the second water dissociation catalyst.

Provided herein are intermediate frame systems and methods, comprising one or more arrays of channels on upper and/or lower edges of the intermediate frame wherein the channels are configured to provide a spatially uniform flow of electrolyte through the plane of the intermediate frame.

A novel electrochemical cell is disclosed in multiple embodiments. The instant invention relates to an electrochemical cell design. In one embodiment, the cell design can electrolyze water into pressurized hydrogen using low-cost materials. In another embodiment, the cell design can convert hydrogen and oxygen into electricity. In another embodiment, the cell design can electrolyze water into hydrogen and oxygen for storage, then later convert the stored hydrogen and oxygen back into electricity and water.

An electrolytic water production device 1 includes an electrolytic chamber 40 to which water to be electrolyzed is supplied, a first power feeder 41 and a second power feeder 42 arranged to face each other in the electrolytic chamber 40 and having different polarity, a membrane 43 arranged between the first power feeder 41 and the second power feeder 42 so as to divide the electrolytic chamber 40 into a first pole chamber (40a) positioned on a side of the first power feeder 41 and a second pole chamber (40b) positioned on a side of the second power feeder 42, and a control unit 5 for switching the polarity of the first power feeder 41 and the second power feeder 42 between anode and cathode, wherein surfaces of the first power feeder 41 and the second power feeder 42 are formed of a hydrogen storage metal, and the control unit 5 has an operation mode for switching the polarity each time electrolysis is started in the electrolytic chamber 40.

Systems and processes for the production of hydrogen (H2) gas and oxygen (O2) gas from an aqueous electrolyte solution are described. A water-splitting system can include a reactor that includes H2 and O2 generating chambers that can be separate chambers but are not separated by a H2 and/or O2 gas permeable material. The H2 generating chamber can include a cathode and at least a first fluid inlet. The O2 generating chamber can include an anode in electrical communication with the cathode and at least a first fluid inlet. The first and second fluid inlets can each be configured to receive a purged electrolyte solution, a purge gas, or a mixture thereof.

A system and a method for the recovery of carbon dioxide from a gas containing it. The system of the invention includes: pressurizing means for pressurizing the gas, an absorption tank for absorbing into water the carbon dioxide contained in a gas pressurized with the pressurizing means, a desorption tank for desorbing from water the carbon dioxide absorbed in water, means for circulating water from the absorption tank into the desorption tank and from the desorption tank back into the absorption tank, and recovering means for the recovery of carbon dioxide capable of being desorbed from the water. The system's absorption tank houses an agitator with a function of enabling water to circulate in the absorption tank by ejecting it into an air space of the absorption tank and by spreading in the absorption tank's air space over an area as extensive as possible.

This invention concerns a device for dissociating an aqueous phase to generate hydrogen gas, said device comprising: a first zone comprising said aqueous phase, a means of electron capture, a means for reducing protons, and an energy source, said device being characterized in that said means for proton reduction is a proton exchange interface with a front side facing said means of electron capture, and a back side, with only said back side of said proton exchange interface bearing at least one catalyst and/or at least one catalytic system.

A membrane-electrode-gasket assembly for alkaline water electrolysis, the assembly including: a separating membrane having first and second membrane faces; a first electrode arranged in contact with the first membrane face; and an insulating gasket holding the membrane and the electrode as one body, the gasket including: first and second faces for contacting with anode- and cathode-side frames respectively; a slit part opening toward an inner side of the gasket and receiving the entire peripheries of the membrane and the electrode; first and second parts facing with each other across the slit part; and a continuous part arranged on an outer periphery side of the slit part, uniting the first and second parts into one body, and sealing an outer periphery end of the slit part, wherein the first and second parts sandwich therebetween to hold the entire peripheries of the membrane and the electrode received in the slit part into one body.

A method of removing carbon dioxide from an atmosphere and generating hydrogen includes capturing carbon dioxide from the atmosphere in an alkaline capture solution, sending the alkaline capture solution to a series of electrolyzers in a CO.sub.2-rich path, wherein each electrolyzer cell raises the acidity of the input CO.sub.2-rich solution to produce an acidified CO.sub.2-rich solution, removing carbon dioxide from the acidified CO.sub.2-rich solution at a carbon removal unit to produce a CO.sub.2-poor solution, sending the CO.sub.2-poor solution to the series of electrolyzers in a return path, wherein each electrolyzer raises the alkalinity of the return CO.sub.2-poor solution to produce a basified CO.sub.2-poor solution, wherein a difference in pH between the CO.sub.2-rich solution and the CO.sub.2-poor solution within each electrolyzer is less than 3, and returning the basified CO.sub.2-poor solution to the carbon dioxide capture unit operation.

An assembly comprising a SOEC/SOFC-type solid oxide stack, and a clamping system for the stack, said clamping system comprising at least two clamping rods that can be used to assemble upper and lower clamping plates. The assembly further comprises a heat exchange system formed at least in part by at least two hollow clamping rods of the clamping system, through which a fluid to be superheated or preheated flows.