TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The positive and negative electrode materials are capable of storing and donating protons. The electrolyte is a proton-conducting electrolyte. The positive electrode material and negative electrode material have different thermodynamic potentials. The positive electrode material is coated on a conductive metal or on carbon. The device further comprises a source of oxygen and hydrogen. The electrolyte is exposed to ambient air. The positive electrode material and the negative electrode material are exposed to ambient air. A substrate is capable of converting water to oxygen and hydrogen when exposed to ambient energy, preferably heat or light.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Materials: The positive electrode material comprises hydrous ruthenium oxide or hydrous iridium oxide. The hydrous ruthenium oxide is coated on platinum metal, titanium metal or carbon paper. The negative electrode material comprises platinum metal, ruthenium, manganese, molybdenum, tungsten, gold, palladium, silver, titanium, copper, zinc, nickel, aluminum, gallium, germanium, arsenic, selenium, silicon, or phosphorus.The positive electrode and/or negative electrode may be a hydrogen storage alloy.The substrate is titanium foil. It may be the positive electrode and/or negative electrode.The electrolyte may be aqueous. It may comprise sulfuric acid, seawater, tap water or oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Materials: The positive electrode material comprises hydrous ruthenium oxide or hydrous iridium oxide. The hydrous ruthenium oxide is coated on platinum metal, titanium metal or carbon paper. The negative electrode material comprises platinum metal, ruthenium, manganese, molybdenum, tungsten, gold, palladium, silver, titanium, copper, zinc, nickel, aluminum, gallium, germanium, arsenic, selenium, silicon, or phosphorus.The positive electrode and/or negative electrode may be a hydrogen storage alloy.The substrate is titanium foil. It may be the positive electrode and/or negative electrode.The electrolyte may be aqueous. It may comprise sulfuric acid, seawater, tap water or oxide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Material: The electrolyte may be polymer.