Abstract

RuO 2- Re 2O 3/Ti (Ru: Re 7:3) electrodes prepared from the thermal decomposition of RuCl 3 and ReCl 3 were much more porous than conventional RuO 2/Ti electrodes. Porosities of the RuO 2- Re 2O 3/Ti electrodes depended on the ionic radii of the rare earth ions. Rare earth ions added to electrodes to prepare the RuO 2- Re 2O 3/Ti electrodes were completely dissolved in the acid solution. After dissolution of the rare earth ions, the voltammetric charges of the resulting RuO 2/Ti electrodes were still large. Rare earth chlorides were effective as pore initiators in preparing porous RuO 2/Ti electrodes, and were recovered after the preparation as catalysts.

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