Abstract

IrO2-R2O3/Ti (R: rare earth ion, Ir:R=7:3) electrodes prepared from the thermal decomposition of IrCl3 and RCl were much more porous than conventional IrO2/Ti electrodes. Rare earth ions added to electrodes for preparing the IrO2-R2O3/Ti electrodes were completely dissolved in the acid solution. After the dissolution of rare earth ions, voltammetric charges of resulting IrO2/Ti electrodes were still large. Rare earth chlorides are effective for preparing highly porous Ir2/Ti electrodes as pore initiators and they can be recovered after the preparation as catalysts.

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