An apparatus for alkaline water electrolysis including: an electrolysis vessel; first and second gas-liquid separators respectively separating electrolytes and oxygen/hydrogen gas flowing out from anode/cathode chambers; first and second electrolyte tanks respectively storing the electrolytes separated by the first/second gas-liquid separators; oxygen and hydrogen gas feed pipes respectively introducing the separated oxygen/hydrogen gas into gas phase parts of the first/second electrolyte tanks; oxygen and hydrogen gas exhaust pipes respectively allowing oxygen/hydrogen gas to flow out from the gas phase parts of the first/second electrolyte tanks therethrough; and a circulator supplying the electrolytes from the first and second electrolyte tanks to the electrolysis vessel.

A system and method for producing hydrogen and/or power at scale. A partial combustion of a carbonaceous gaseous and/or liquid feed with an oxygen-containing feed generates heat for pyrolyzing non-combusted carbonaceous gaseous and/or liquid feed materials to produce an effluent including hydrogen, carbon monoxide, carbon dioxide, water, and nitrogen. Electrolysis powered by a renewable energy source converts water to hydrogen and oxygen for the oxygen-containing feed. Hydrogen is collected from the electrolysis, and also from the effluent, and sent to a hydrogen-based power generator.

An apparatus and method are provided for the electrochemical production of hydrogen, oxygen and metal hydroxide wherein the metal is derived from a metal silicate. The process involves the electrolysis of a metal salt solution where hydrogen and a metal hydroxide are produced at the cathode, and oxygen, or chlorine, and an acid are produced at the anode. The acid is reacted with a metal silicate producing a soluble metal salt and water that is used in turn to make solid or dissolved metal hydroxide. The net CO.sub.2 and acid gas emissions of the invention and its products may therefore be significantly reduced or turned negative.

Embodiments of nitric oxide (NO) generation apparatuses, systems, and methods are provided. In some embodiments, an NO generation apparatus may include a reaction chamber having a liquid region and a gas region. The liquid region may be configured to contain a reaction medium and the gas region may be configured to contain a product gas comprising NO. The NO generation apparatus may also include a plurality of electrodes disposed in the reaction medium, and may include an energy source electrically connected to the plurality of electrodes and configured to apply a predetermined voltage or a predetermined current to at least one of the plurality of electrodes to generate NO. The NO generation apparatus may also include an inlet circuit configured to receive a carrier gas, and may include at least one sparger in fluid communication with the inlet circuit and configured to emanate bubbles of the carrier gas in the reaction medium.

A solid oxide electrolyzer cell (SOEC) system, the system including one or more stamps that receives hydrogen input and outputs wet hydrogen, a heat exchanger or condenser that receives the wet hydrogen, the heat exchanger or condenser being configured to decrease the temperature of the wet hydrogen and remove at least some of the saturated water vapor in the wet hydrogen, a compressor that is configured to increase the pressure of the wet hydrogen, and a dryer that is configured to reduce the dew point of the wet hydrogen.

An electrochemical cell active hydrogen capture and release system including a first zone having a target predetermined concentration of hydrogen c1 and housing: an electrical component, an adsorbing electrode including a hydrogen adsorbing material, a counter electrode separated from the adsorbing electrode, and an electric circuit connecting the adsorbing and counter electrodes to apply electrical bias configured to facilitate capture and release of hydrogen gas from the adsorbing electrode; and a second zone having a target predetermined concentration of hydrogen c2, c2 being greater than c1.

The present disclosure refers to systems and methods for remediating a produced water from an oil or gas well. A representative process may comprise optionally purifying and then electrolyzing the produced water to produce at least hydrogen and oxygen; storing, selling, releasing, or converting oxygen to a useful oxygen product; and storing, selling, releasing, or converting hydrogen to a useful hydrogen product and to produce fresh water for beneficial reuse. Alternatively or additionally, the optionally purified produced water may be subjected to steam reformation with methane to produce carbon dioxide and hydrogen which can be used as desired.

A method for operating an electrolysis system which includes an electrolyzer for generating hydrogen and oxygen as product gases, the product gas streams being discharged from the electrolyzer. A secondary gas is mixed with at least one of the product gas streams with the goal of reducing the foreign gas concentration in the product gas stream to be treated by an increase of the overall volume flow.

Provided herein are systems and methods for generating hydrogen and ammonia. The hydrogen is generated in an anion exchange membrane-based electrochemical stack. The hydrogen generated in the stack may be used to generate ammonia or may be used for other applications requiring hydrogen. The feedstock for the anion exchange membrane-based electrochemical stack may be saline water, such as seawater. A desalination module or a chlor-alkali stack may be used to treat the saline water prior to electrolysis in the anion exchange membrane-based electrochemical stack.

One variation of an electrolyzer system includes a skid loaded with a set of modules including a feed-supply module, configured to generate a feed mixture of carbon dioxide and water, and, an electrolysis module including: a cell stack arranged within an insulated housing and configured to receive metered volumes of the feed mixture from the feed-supply module to generate a fuel mixture of syngas, water, and carbon dioxide via electrolysis; and a set of heating elements configured to regulate temperature of the cell stack within a target temperature range and regulate temperatures of the feed mixture, the air mixture, and the fuel mixture within the insulated housing. The skid can further include: a processing module configured to extract syngas from the fuel mixture received from the electrolysis module; and a power module configured to drive a voltage across the cell stack to promote electrolysis of the feed mixture.