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Zirconium oxide-based compounds without partial oxidation of zirconium carbonitride were investigated as nonplatinum cathode for polymer electrolyte fuel cell. Zirconium oxide-based compounds were prepared by solutionprecipitation method and heat-treated at different temperature. In X-ray diffraction patterns tetragonal ZrO2 peaks decreased whereas monoclinic ZrO2 peaks increased with increasing temperature. Onset potential for oxygen reduction reaction (ORR) of the specimen heat-treated at 1000°C reached 0.90 V vs. RHE, indicating that the specimen had defi nite ORR activity. The increase of ORR activity may be explained by the increase of Zr and / or oxygen vacancies due to the transformation of ZrO2 from tetragonal to monoclinic structure from the XRD results.

Zirconium Oxide-Based Compounds as Non-Pt Cathode for Polymer Electrolyte Fuel Cell