Oxygen Transfer Kinetics Between Ga-Ga[sub 2]O[sub 3] Electrodes and the Solid Electrolyte Calcia-Stabilized Zirconia

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Abstract
The kinetics of oxygen transfer between composite electrodes and the solid electrolyte calcia‐stabilized zirconia, , were studied with the symmetric, galvanic cell over the temperature range from 800° to 900°C. Chronopotentiometric studies were conducted using current densities from 0.3 to 130 µA/cm2 to obtain over‐potentials for faradaic oxidation and reduction reactions at the interface. A linear dependence of the overpotential on current density was obtained, corresponding to a local electrode resistance of 3.8 ohm/cm2 of electrode‐electrolyte interface at 800°C. The data are in agreement with a solution‐diffusion mechanism of oxygen transport through liquid Ga in the electrode between the electrolyte and particles.
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