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Abstract
In the search for active cathode catalysts for polymer electrolyte fuel cells (PEFCs) using inexpensive materials, several valve metal oxide electrodes, TiO x , ZrO x , and TaO x , with corresponding binary oxide electrodes were selected for the evaluation of catalytic activity for oxygen reduction reaction (ORR) by means of cyclic voltammetry in 0.1 M HClO 4 at 60 °C. These oxide electrodes were prepared mainly by the dip-coating method on a titanium plate substrate at a temperature between 400 °C and 500 °C and were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), and X-ray photoelectron spectroscopy (XPS). Among the oxide-coated electrodes investigated, Ti 0.7Zr 0.3O x /Ti provided the highest ORR specific activity, with an onset potential, E ORR, of 0.86 V vs. RHE during the cathodic potential sweep. Fine TaO x particles prepared as an extension of the dip-coating method, showed very high catalytic activity determined by means of hydrodynamic voltammetry in 0.1 M HClO 4 at 30 °C with an E ORR of 0.90 V vs. RHE.
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