Patent ID: 8540962

Claim:
A method for producing hydrogen by means of thermochemical water-splitting comprising: simultaneously progressing an oxygen evolution reaction and a hydrogen evolution reaction while a fluidized bed comprising particles of a metal oxide is circulated within a solar reactor, by using a device for producing hydrogen by means of thermochemical water-splitting, wherein the device comprises: the solar reactor storing the fluidized bed comprising the particles of the metal oxide, the solar reactor comprising: a cylindrical draft tube that is open in a top and bottom direction, buried into the fluidized bed, and arrange in a center portion of the fluidized bed; a low-oxygen partial pressure gas introduction means introducing a low-oxygen partial pressure gas into an inside of the draft tube from a lower portion of the draft tube; a water vapor introduction means introducing water vapor into an outside of the draft tube from the lower portion of the draft tube; and a gas separation means separating a gas upwardly released from the inside of the draft tube and a gas upwardly released from the outside of the draft tube; a solar light concentration means concentrating and irradiating solar tight onto the fluidized bed stored within the solar reactor; and wherein the oxygen evolution reaction releases oxygen from the metal oxide by heating a part of the fluidized bed by solar light under a low-oxygen partial pressure gas atmosphere and the hydrogen evolution reaction releases hydrogen by allowing the metal oxide with oxygen having been released therefrom to come into contact with water vapor.