Study of the oxygen electrode reaction using mixed conducting oxide surface layers: Part I: Experimental methods and current-overvoltage experiments

M.P. van Dijk, K.J. de Vries, A.J. Burggraaf

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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.
Original languageEnglish
Pages (from-to)73-81
JournalSolid state ionics
Volume21
Issue number1
DOIs
Publication statusPublished - 1986

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