Abstract
The change in contact potential difference (CPD) between YSZ (2% Y 2O 3 stabilized ZrO 2 and a Pt reference electrode was measured under a controlled oxygen partial pressure ( PO 2) with a high temperature Kelvin probe. The work function change of the Pt reference electrode (φ ref.) was calculated by comparing the results of the YSZ-Pt measurement and that of the Pt-Pt measurement, and thus the work function change of YSZ (φ YSZ) caused by the change of the flowing gas composition was determined. From the experimental results, the exponent of Po 2 dependence of φ YSZ was estimated to be 1 4.1 in the Po 2 range of 2 × 10 2-3 x 10 3 Pa. This was in good agreement with the value of 1 4 predicted from the estimate based on defect equilibria.
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