Abstract
In this paper, the behaviour of an anodic catalyst made by calcium doped cobalt layered perovskite type 114 electrode (Y0.5Ca0.5BaCo4O7) has been investigated for the electrooxidation process of sulphite ions in neutral media (1 mol L−1 Na2SO4). This research is necessary to understand the oxidation mechanism on the surface of this type of electrode. Voltammetric techniques (cyclic and linear) have been applied in order to describe the electrooxidation mechanism and to find the optimum parameters for sulphite anodic oxidation. Kinetic parameters for the process occurring on the working electrode surface have been determined by Tafel plots method. Further, electrochemical impedance spectroscopy was performed to confirm the sulphite oxidation mechanism on Y0.5Ca0.5BaCo4O7 electrode. Optimum characteristic parameters, such as current density, oxidation potential range for sulphite electrooxidation and SO32− ions transformation degree in test solutions, have been obtained by chrono-electrochemical methods (chrono -amperometry, -potentiometry, -coulometry).
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