NOVELTY - Producing dry hydrogen gas, in which water content is less than 0.01 ppm, under pressure, using a metallic membrane, comprises introducing hydrogen into the metallic membrane by the effect of cathodic polarization to perform an electrochemical reaction to reduce the hydrogenated species, then diffusing through the metallic membrane under the action of an activity gradient of the hydrogen through the thickness, and recombining gaseous hydrogen on the second face of the metallic membrane defining a closed chamber which acts receptacle of the hydrogen to be generated.    USE - The method is useful for producing dry hydrogen gas (claimed).    ADVANTAGE - The method produces dry hydrogen gas with purity of greater then 99.999 wt.%.    DETAILED DESCRIPTION - Producing dry hydrogen gas, in which water content is less than 0.01 ppm, under pressure, using a metallic membrane whose one side is in contact with a protic liquid solution (3) containing a hydrogen species (promoter) in which the hydrogen is at an oxidation degree of greater than zero, comprises introducing hydrogen into the metal membrane by the effect of cathodic polarization, leading to an electrochemical reaction to the hydrogenated reduction species, then diffusing through the metallic membrane under the action of an activity gradient of the hydrogen through the thickness, and recombining gaseous hydrogen on the second face of the metallic membrane defining a closed chamber which acts receptacle of the hydrogen to be generated. An INDEPENDENT CLAIM is included for a device for producing dry hydrogen gas, comprising: capillary tubes arranged in parallel, where each tube is closed at one of its ends, and open ends of the tube communicate with a manifold (2) that feeds the steam circuit, which is a safety valve (6), an overflow tube (7), and a reservoir for collecting the produced hydrogen; an electric circuit for the cathodic polarization of the capillary tubes and an anode (5); and an electrolytic medium consists of an aqueous solution containing hydrogen promoter, where the capillary tubes and the anode are immersed in the medium.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a device for producing dry hydrogen gas.    Manifold (2)    Protic liquid solution (3)    Anode (5)    Safety valve (6)    Overflow tube. (7)