Palladium oxide was detected by XPS and IR (Attenuated Total Reflection) analysis of the surface of a Pd electrode which was polarized in the medium 1 M KOH. This oxide set a peak of Pd M,,, shifted 3.5 eV with respect to the metal which is a much higher value than those reported and obtained for PdO and PdO,. An IR absorption band of 535 cm-' was found to be different from those reported in the literature of PdO and PdO, .The presence of this oxide is in agreement with results obtained using electrochemical methods where the existence of PdO, has been assumed.
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