MEDIUM-TEMPERATURE PERFORMANCE OF CERMET ELECTRODE CONTAINING AG AND 3BI(2)O(3)CENTER-DOT-WO3

Abstract

Cermet electrodes composed of Ag and 3Bi(2)O(3) . WO3 have been prepared on a 3Bi(2)O(3) . WO3 electrolyte by screen printing. The interfacial resistance of the cermet electrode is measured by a.c. impedance technique in air. The electrode shows the lowest interfacial resistance, 103 Omega cm(2) at 400 degrees C, when the oxide content is 50 wt.% and the electrode thickness is above 35 mu m This electrode resistance is lower than that of a pure Ag electrode (by a factor of three) and other reported interfacial resistances on bismuth-based electrolytes. The activation energy for the interfacial conductivity of the cermet electrode, 1.2 eV, is the same as that of the Ag electrode.