Over the top: Electrochemically induced oxygen spillover on a Pt film has been investigated by photoelectron emission microscopy. Oxygen ions migrate through the YSZ substrate to the triple-phase boundary, where they are converted into adsorbed oxygen atoms that can oxidize the carbon layer on the Pt surface (see scheme; YSZ=yttria-stabilized zirconia).
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Luerßen et al. (2006) studied this question.
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