Luxon Energy Devices Corporation

Yi-Ping Lan

Lih-Ren Shiue

Nae-Lih Wu

Dien-Shi Wu

Chieng-Wen Chao

Iron oxide film directly grown on iron, steel, or other substrates by chemical or electrochemical oxidation is a promising material for energy storage through surface adsorption of static charges. As the electrode materials of energy-storage devices, the hydrated iron compound has a chemical composition of Fe O H , where 1.0&lE;x&lE;3.0, 0.0&lE;y&lE;4.0, and 0.0&lE;z&lE;1.0. An aqueous or organic solution of a metallic salt including sulfates, sulfites, hydroxides, chlorides, phosphates and nitrates is used as electrolyte for the electrochemical devices. Cyclic voltammetry indicates that the iron-oxide electrodes in the electrolytes can store charges as high as 0.5 F/cm or 320 F/g of the electrode materials. Electrochemical capacitors using the iron oxide as the electrode material is an economical and viable power source for use in portable electronics, power tools, and electrical vehicles.

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Tau Yuan, Taiwan

Yi-Ping Lan