Abstract
This paper presents an easy electrochemical evaluation of the charge transfer controlling steps in the mechanism of water oxidation on Ti/IrO2, Ti/IrO2/SnO2/Sb2O3 and Ti/IrO2/Ta2O5. Current density vs. polarization curves (j-Δ plots) were obtained for each electrocatalyst taking the reached current density for specific polarization values at 0.25 s from an oxidation chronoamperometric series in 0.5M H2SO4. Tafel model was used to compare and determinate which material improves the oxygen bubbles evolution, looking forward to use those electrodes in electroflotation processes. The electrodes were comparated vs. Pt to show their remarkable electrocatalytic behavior. Ti/IrO2 (100%) and Ti/IrO2/Ta2O5, seemed to be the more suitable materials for oxygen evolution due to their low electric energy consumption. However Ti/IrO2/SnO2/Sb2O3 were selected as the more convenient electrode, since its great oxidation kinetic was showing no pseudostationary state for charge transfer after water adsorption on electrode vacancies.
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