Abstract
Potential-step chronoamperometry of Ag/YSZ (YSZ = yttria stabilized zirconia) air cathodes was measured at 350–500°C in air. A decay equation was derived by solving Fick's diffusion equation assuming a diffusion mechanism in which oxygen diffuses through the solid silver and is reduced to oxide ion at the Ag-YSZ. The theoretical decay curves calculated from the decay equation were fitted to the experimental data by optimizing the equation parameters. The diffusion constant calculated from the time constant, which was obtained as one of the optimized parameters, agreed with the known values. This agreement suggests that the silver electrode shows bulk oxygen permeation.
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