Study of the oxygen electrode reaction using mixed conducting oxide surface layers. Part II: Small signal analysis |
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| Institution: | 1. Laboratory of Spectroscopic Characterization and Optic Materials, Faculty of Sciences, University of Sfax, B.P. 1171, 3000 Sfax, Tunisia;2. Laboratory of Physics of Materials and Nanomaterials Applied to the Environment, Faculty of Sciences of Gabes, University of Gabes, Erriadh, 6079 Gabes, Tunisia;1. Laboratory of Materials, Organization and Properties (LMOP), Campus Universities, El-Manar, 2092 Tunis, Tunisia;2. University of Sfax, Faculty of Sciences, Laboratory LaSCOM, BP1171, 3018 Sfax, Tunisia |
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| Abstract: | The oxygen gas electrode has been studied for a number of mixed conducting oxide surface layers on top of Gd2Zr2O7 (TGZO) solid electrolytes. In part II of this paper we present the results of frequency dispersion measurements for the electrode reaction, supplying additional information to the results of current-overvoltage experiments presented in part I. For both kinds of experiments the same trends were observed for the electrode polarization. Best results are obtained for a surface layer of TGZO, while p-type mixed conducting oxides give less decreased values of the electrode polarization. High electrode capacitances were found in the case of mixed conducting surface layers (about 700 F/m2). The electrode reactions follow a Butler-Volmer type of equation. Most probably a diffusion process is rate controlling the overall charge transfer process. |
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