VOLTAMMETRIC STUDIES ON THE PALLADIUM OXIDES IN ALKALINE MEDIA

The formation and stripping of palladium oxides on a palladium electro de in a 0.1M LiOH solution was studied by cyclic voltammetry. Cyclic p olarization methods were used to form palladium oxides on the surface of the palladium electrode. Three different types of palladium oxides were found to be formed in alkaline solutions. A higher oxidation stat e of palladium oxide (PdO3) can be formed (induced) on the surface of the electrode even at low anodic potential limit, 0.6 V (vs. SCE). Str ong evidence that PdO3 can only be formed in a specific potential rang e is presented. From the voltammograms obtained after a long cyclic po larization time, the peak in the range of -0.47 to -0.60 V could be at tributed to the reduction of dehydrated PdO.