THE OXIDATION OF PALLADIUM

Thermodynamic properties of palladium oxide, PdO, were determined by means of emf technique, using solid electrolyte galvanic cells: Pt, Pd, PdO vertical bar ZrO(2) + Y(2)O(3)vertical bar air, Pt with air reference electrode. The main experimental problem was to obtain both palladium and palladium oxide, as well in the form of powders, which was attained by complicated chemical procedure. Gibbs energy of oxidation reaction was derived from emf values measured within temperature range: 843 - 1100 K, and standard thermodynamic functions were then calculated at room temperature, using the most recent C(p) data. Comparison of quantities obtained in this study with other recent experimental values from literature and data from thermochemical compilations displays very good agreement.