The Behavior of Iridium Oxide-Coated platinum used as Oxygen Electrode of Fuel Cell

Abstract

Iridium oxide-coated platinum was prepared on the idea that coating of a tetravalent iridium cation will increase the amount of adsorbed oxygen on a Pt electrode because Ir4+ has large electron accepting property, the reversible potential of oxygen electrode reaction has been established on the iridium oxide-coated platinum in dilute aqueous boric acid solutions and observed about one year. The value of the exchange current density is ten times as much as the most active values reported in the literature. XPS observation confirmed that the surface Ir species was IrO2. © 1988, The Chemical Society of Japan. All rights reserved.