NOVELTY - An apparatus comprises chamber (30) having air electrode (4), reusable electrolyte for ions Transportation, metal electrode (14) for oxidizing electrolyte, hydrolysis electrode for producing hydrogen and oxygen gases, inlet (19) for channeling of water, outlet (20) for draining water, gas inlet (23) to pressurize the chamber with hydrogen and oxygen gases, a catalyst for hydrogenation of used electrolyte, a polymeric membrane for absorbing hydrogen and oxygen gases, and energy harvesting circuit (16) connected with both metal and air electrodes.    USE - As an apparatus for use in energy harvesting system (claimed).    ADVANTAGE - The apparatus do not require in-feed device and comprising a cyclic electrolysis of water inside a membrane; provides an apparatus for use in energy harvesting systems, where no draining of water is required.    DETAILED DESCRIPTION - An apparatus for use in energy harvesting system comprises a chamber (30) for retaining hydrogen and oxygen, where the chamber comprising at least one air electrode (4) for reducing oxygen molecules; reusable electrolyte for ions transportation, at least one metal electrode (14) for oxidizing the electrolyte, at least one hydrolysis electrode for producing hydrogen and oxygen gases, at least one inlet (19) for channeling of water; at least one outlet (20) for draining water, at least one gas inlet (23) to pressurize the chamber with hydrogen and oxygen gases; a catalyst for hydrogenation of used electrolyte, a polymeric membrane for absorbing hydrogen and oxygen gases, and for preventing gas materials from escaping the chamber, and an energy harvesting circuit (16) connected with both metal and air electrodes. An INDEPENDENT CLAIM is included for a method for use in energy harvesting, involving providing a reusable electrolyte; providing at least one metal electrode and one air electrode, providing hydrogen gas by way of water hydrolysis, absorbing hydrogen gas, and hydrogenating the reusable electrolyte with a catalyst.    DESCRIPTION OF DRAWING(S) - The figure shows an elevated view of apparatus.    Air electrode (4)    Metal electrode (14)    Energy harvesting circuit (16)    Hydrolysis electrode (17)    Water flow (18)    Inlet (19)    Outlet (20)    Ion/gas permeable membrane (21)    Gas inlet (23)    Chamber (30)