NOVELTY - The process for stocking and producing hydrogen, comprises circulating a donor of cations in a unit having an anode (20), a cathode adapted to stock the atomic and/or molecular hydrogen and an ion permeable wall (21), applying a tension (1.24-4 volts) between the anode and cathode during production of hydrogen, evacuating an electrolyte, and heating the cathode at 70-350 degrees C to produce gaseous hydrogen. An electrical non-conducting material or an ionic conducting material is placed between the cathode and the cations. The ion permeable wall is subjected to an electric field.    USE - The process is useful for stocking and producing hydrogen, which is useful for producing energy to vehicles, electronic apparatus or electricity generators and which is useful in a fuel cell and/or fuel or reagent.    ADVANTAGE - The process is capable of economically, efficiently and intermittently stocking all forms of renewable energy such as wind or solar energy thus enhancing the performance characteristics of the electric and electronic apparatus that uses the hydrogen gas.    DETAILED DESCRIPTION - The process for stocking and producing hydrogen, comprises circulating a donor of cations in a unit having an anode (20), a cathode adapted to stock the atomic and/or molecular hydrogen and an ion permeable wall (21), applying a tension (1.24-4 volts) between the anode and cathode during production of hydrogen, evacuating an electrolyte, and heating the cathode at 70-350 degrees C to produce gaseous hydrogen. An electrical non-conducting material or an ionic conducting material is placed between the cathode and the cations. The ion permeable wall is subjected to an electric field to form the atomic and/or molecular hydrogen at an interface of the cathode and the electrical non-conducting material, and comprises layers of different material. The cathode is heated and/or depressed for returning the hydrogen gas. The wall comprises layers experiencing a function of cationic conductor, a porous layer having a support function between layers experiencing the function of cationic conductor and the electrolyte. The donor of cations has H+ ions, and an aqueous acid solution. The heat is provoked by Joule effect during circulation of electric current. INDEPENDENT CLAIMS are included for:    (1) a unit for stocking and returning hydrogen;    (2) a process for the production of electricity;    (3) a refilling device; and    (4) an electrical apparatus such as telephone or laptop.    DESCRIPTION OF DRAWING(S) - The figure shows a partial and longitudinal view of an unit for stocking and returning hydrogen.    Openings (14)    External casing (15)    Cover (16)    Anode (20)    Wall. (21)