Preparation and characterization of KTa0.9Fe0.1O3-δ perovskite electrodes

The effect of the partial substitution of tantalum by iron on the structural and electrical properties of the KTaO3 perovskite-type oxide powders has been studied. The powders were prepared by the standard ceramic method, and the respective structural characterization performed by X-ray powder diffraction. From the synthesized oxide samples, iron-coated electrodes were fabricated and tested as the anode for the oxygen evolution reaction in alkaline medium. An estimation of the electrode's capacity has been calculated from the charging currents and the corresponding roughness factor evaluated. The electrocatalytic activity/stability of the oxide electrodes in alkaline solutions has been analysed through the kinetic parameters.