Abstract
Oxygen ionization and diffusion were visualized at the practical flatten tube SOFC stack/cells. Stable isotope oxygen (18O) was applied to label the motion of oxygen/oxide ions with secondary ion mass spectrometry (SIMS) analysis. Surface reactivity and diffusivity of oxygen (oxide ions) were compared between the fuel cell operating condition and non-current flow conditions. A peak of 18O-concentration was observed under fuel cell operating condition at the interlayer between cathode and electrolyte. This suggested that the active sites for 18O ionization and diffusion were at the interlayer. Also, a slow 18O diffusion layer can be formed at the interlayer/electrolyte interface because of the discontinuous 18O distribution profiles.
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