Abstract: Process for production of hydrogen of high purity by photoelectrochemical means with low energy consumption. The process is carried out in an electrochemical cell which comprises at least one anodic chamber with an anode and at least one cathodic chamber with a cathode, in which the two chambers are separated by an ion-exchange membrane, where: i) the anodic chamber contains an aqueous anodic solution which comprises the Fe2+ion, and the aqueous solution is adjusted to a pH less than or equal to 5; ii) a sacrificial substance is added to the anodic chamber; iii) the anodic solution is irradiated with ultraviolet light and/or visible light; iv) the cathodic chamber contains an aqueous cathodic solution which has a proton concentration equal to or higher than 10?3 M; and v) electric current is fed between the anodic chamber and the cathodic chamber separated by the membrane, this membrane being a proton-selective ion-exchange membrane impermeable to the iron and impermeable to the sacrificial substance.

Abstract: The present invention provides a new method for obtaining hydrogen gas that comprises the stages of providing at least one aluminium alloy; providing at least one hydride of general formula (I), where X is selected between B and Al; Y is selected from among Li, Na, K, Mg, Ca and Al; and n is an integer number from 1 to 3; and providing an aqueous medium; so that the reaction between said aluminium alloy with said hydride in said aqueous medium is carried out at a temperature between 4 and 300° C. to produce hydrogen gas and other reaction products with good yields.

Abstract: The invention relates to a process for production of hydrogen of high purity by photoelectrochemical means with low energy consumption.