A method for producing hydrogen via a thermochemical route from water, based on the cerium-chlorine cycle is provided. The method comprises, according to a first reaction scheme, the following reactions: H2O+Cl2=2HCl+½O2;  (A) 8HCl+2CeO2=2CeCl3+Cl2+4H2O;  (B) 2CeCl3+4H2O=2CeO2+6HCl+H2;  (C) or, according to a second reaction scheme, the following reactions: H2O+Cl2=2HCl+½O2;  (A) 8HCl+2CeO2=2CeCl3+Cl2+4H2O;  (B) 2CeCl3+2H2O=2CeOCl+4HCl;  (B′) 2CeOCl+2H2O=2CeO2+2HCl+H2;  (C′) wherein the reaction (B) for chlorination of cerium oxide is conducted in a liquid phase, the cerium chloride passing into solution, and wherein the reaction (B) is catalyzed by fluoride ions.