SUB-STOICHIOMETRIC TITANIUM-OXIDES AS CERAMIC ELECTRODES FOR OXYGEN EVOLUTION - STRUCTURAL ASPECTS OF THE VOLTAMMETRIC BEHAVIOR OF TINO2N-1

Oxygen evolution by electrolysis of aqueous solutions has been studied on metallic conducting oxides, known as Magneli phases. The TinO2n-1 ceramic electrodes have been prepared by reduction of TiO2 compacts wi th hydrogen. The voltammetric behaviour before and after the electrode reaction was investigated and the response of the oxide surface to th e anodic polarization was observed. The influence of porosity of the c eramic electrodes on the electrochemical reaction was examined using e lectrodes of different pore size distributions. The roughness factors of the electrodes were estimated utilizing cyclic voltammetry.