The disclosure provides a method of producing hydrogen. The method comprises conducting a thermochemical reaction by contacting a metal, or an alloy thereof, with steam to produce a metal oxide and/or a metal hydroxide and hydrogen. The method then comprises contacting the metal oxide and/or the metal hydroxide produced in the thermochemical reaction with water or a basic aqueous solution to produce a solution comprising a metal ion. Finally, the method comprises conducting an electrochemical reaction by applying a voltage across an anode and a cathode, whereby at least a portion of the cathode contacts the solution comprising the metal ion, to produce hydrogen, oxygen and the metal, or the alloy thereof.

The present disclosure relates to a rotating liquid film reactor with gas-liquid concurrent and use thereof in preparation of metal hydroxides. The present disclosure starts from the basic process of preparing metal hydroxides by a gas-liquid precipitation method, and designs a rotating liquid film reactor with gas-liquid multi-fluid concurrent through computational fluid dynamics simulation analysis. Multiple gas-liquid fluid inlets are constructed, and the traditional vertical inlet is improved to tangential feed along the rotation direction, which enhances the forced mixing process of gas and liquid phases in the reaction space, and intensifies the micro-mixing and nucleation process of reactant ions. An inlet anti overflow device is further provided to prevent fluid from overflowing upwardly upon increasing the inlet flow volume, thereby improving product quality control and achieving effective control of particle size and distribution in nucleation while improving production efficiency and quality, obtaining products with smaller particle size and narrower distribution. The particle size of the product is controlled within the range of 15-200 nm, while the primary particle size distribution range is reduced to 30-60 nm.

The present disclosure relates to a rotating liquid film reactor with gas-liquid concurrent and use thereof in preparation of metal hydroxides. The present disclosure starts from the basic process of preparing metal hydroxides by a gas-liquid precipitation method, and designs a rotating liquid film reactor with gas-liquid multi-fluid concurrent through computational fluid dynamics simulation analysis. Multiple gas-liquid fluid inlets are constructed, and the traditional vertical inlet is improved to tangential feed along the rotation direction, which enhances the forced mixing process of gas and liquid phases in the reaction space, and intensifies the micro-mixing and nucleation process of reactant ions. An inlet anti overflow device is further provided to prevent fluid from overflowing upwardly upon increasing the inlet flow volume, thereby improving product quality control and achieving effective control of particle size and distribution in nucleation while improving production efficiency and quality, obtaining products with smaller particle size and narrower distribution. The particle size of the product is controlled within the range of 15-200 nm, while the primary particle size distribution range is reduced to 30-60 nm.