Abstract
The effect of water vapour on the oxygen isotope exchange reaction was investigated for gadolinium doped ceria (GDC), scandium stabilized zirconia (ScSZ), and iron doped ScSZ (Fe-ScSZ). A slight amount of water vapour addition made a great enhancement of surface exchange rate of oxygen isotope (18O) on the surface. The surface exchange rate constant of ScSZ and Fe-ScSZ increases with partial pressure of water vapour, whereas the oxygen isotope diffusivity has no dependence. The temperature and water vapour pressure dependences of surface exchange rate are in good agreement with the dependences of water coverage reported on yttria stabilized zirconia (YSZ) surface, which indicates that the adsorbed water molecule plays an important role on the surface exchange reaction.
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