ChemInform Abstract: Formation of a Higher Palladium Oxide in the Oxygen Evolution Potential Range.

Abstract

ChemInform Abstract A higher palladium oxide, PdO3 or a hydrated species of this oxide, is formed in 1 M KOH at potentials above 1000 mV and in 1 M H2SO4 at 1600 mV (SCE). The reduction of this oxide is detected at -800 mV (in 1 M KOH), which corresponds to an overpotential of 1800 mV. XPS analysis of this oxide shows a chemical shift of the Pd 3d5/2 peak between 3.5 and 3.7 eV and the IR (ATR) spectrum exhibits a single band at 535 cm-1.

XPS and IR (ATR) analysis of Pd oxide films obtained by electrochemical methods

“…Over the last few years the presence of a third oxide has been detected by means of electrochemical techniques after polarizing the electrode to potentials that are higher than those corresponding to oxygen evolution reaction. ' p 4 In this work XPS analysis has been used to detect the formation of this higher oxide in the surface of the electrode polarized in basic medium 1 M KOH.…”

Studies on the electrocatalytic reduction of aliphatic aldehydes on palladium‐modified carbon paste electrodes

“…This suggests that the oxidation product of Pd(0) is not Pd'-. However, PdO, can be formed only if the potential is positive enough (> +1.0 V versus SCE) [33][34][35][36]. So the product is supposed to be PdO or some basic salt of Pd(II), for example, Pd(OH)Cl, which adsorbs at the surface of the electrode, whereas Pd" cannot adsorb at the surface, which was proved with a plain CPE.…”