Described herein is a modular system for producing hydrogen or other gases in a densely-packed space, such as an urban setting. The system includes a plurality of hydrogen cabinets installed in a stacked fashion and at least one duct assembly to safely exhaust gases produced by the system.

Described herein is a modular system for producing hydrogen or other gases in a densely-packed space, such as an urban setting. The system includes a plurality of hydrogen cabinets installed in a stacked fashion and at least one duct assembly to safely exhaust gases produced by the system.

An energy storage system converts variable renewable electricity (VRE) to continuous heat at over 1000° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. An array of bricks incorporating internal radiation cavities is directly heated by thermal radiation. The cavities facilitate rapid, uniform heating via reradiation. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. Gas flows through structured pathways within the array, delivering heat which may be used for processes including calcination, hydrogen electrolysis, steam generation, and thermal power generation and cogeneration. Groups of thermal storage arrays may be controlled and operated at high temperatures without thermal runaway via deep-discharge sequencing. Forecast-based control enables continuous, year-round heat supply using current and advance information of weather and VRE availability. High-voltage DC power conversion and distribution circuitry improves the efficiency of VRE power transfer into the system.

A multi-channel alkaline hydrogen production system is disclosed. Using liquid outlets of a hydrogen alkali treatment unit and an oxygen alkali treatment unit, a circulating alkaline liquid is outputted to an alkaline liquid circulating pump and a controllable channel, and then the circulating alkaline liquid is returned to the negative electrode of an electrolyzer; Thus, a controller can control the amount of produced hydrogen according to the measured current of the electrolyzer, then calculates a corresponding alkaline liquid circulation volume reference value according to the amount of produced hydrogen, and according to the alkaline liquid circulation volume reference value, adjusts the circulation amount of the alkaline liquid of the multi-channel alkaline hydrogen production system and changes the gas purity of the multi-channel alkaline hydrogen production system by controlling the working states of the controllable channels on the two ends of the alkaline liquid circulating pump.

The present invention relates to the production of graphene from CO.sub.2 through electrolysis and exfoliation processes. One embodiment is a method for producing graphene comprising (i) performing electrolysis between an electrolysis anode and an electrolysis cathode in a molten carbonate electrolyte to generate carbon nanomaterial on the cathode, and (ii) electrochemically exfoliating the carbon nanomaterial from a second anode to produce graphene. The exfoliating step produces graphene in high yield than thicker, conventional graphite exfoliation reactions. CO.sub.2 can be the sole reactant used to produce the valuable product as graphene. This can incentivize utilization of CO.sub.2, and unlike alternative products made from CO.sub.2 such as carbon monoxide or other fuels such as methane, use of the graphene product does not release this greenhouse gas back into the atmosphere.

-- An electrolysis cell unit capable of efficiently electrolyzing water and carbon dioxide is obtained. An electrolysis cell unit includes at least an electrolysis cell in which an electrode layer and a counter electrode layer are formed with an electrolyte layer interposed therebetween and a discharge path for discharging hydrogen generated in the electrode layer, in which the electrolysis cell being formed in a thin layer on a support and a reverse water-gas shift reaction unit that generates carbon monoxide using carbon dioxide and the hydrogen by a reverse water-gas shift reaction being provided in at least a portion of the discharge path.--

-- An electrolysis cell unit capable of efficiently electrolyzing water and carbon dioxide is obtained. An electrolysis cell unit includes at least an electrolysis cell in which an electrode layer and a counter electrode layer are formed with an electrolyte layer interposed therebetween and a discharge path for discharging hydrogen generated in the electrode layer, in which the electrolysis cell being formed in a thin layer on a support and a reverse water-gas shift reaction unit that generates carbon monoxide using carbon dioxide and the hydrogen by a reverse water-gas shift reaction being provided in at least a portion of the discharge path.--

The present invention discloses a single stage energy efficient process for production of hydrogen enriched/mixed gas at low temperature. More particularly, the present invention discloses a single stage energy efficient process for production of hydrogen enriched compressed natural gas (CNG) or LPG or biogas at low temperature.

The present invention discloses a single stage energy efficient process for production of hydrogen enriched/mixed gas at low temperature. More particularly, the present invention discloses a single stage energy efficient process for production of hydrogen enriched compressed natural gas (CNG) or LPG or biogas at low temperature.

A reverse water-gas shift catalyst that can be used at a high temperature is obtained, and a production method thereof is obtained. The reverse water-gas shift catalyst is obtained by at least supporting one or both of nickel and iron as a catalytically active component on a carrier containing a ceria-based metal oxide or a zirconia-based metal oxide as a main component, and a ratio of the carrier to the entire catalyst is 55% by weight or more.