The valence of iridium in anodic iridium oxide films has been determined by x‐ray absorption spectroscopy and varies between 3.0 and 4.8 in a voltammogram cycle. When the valency starts to increase the first coordination shell around an iridium ion begins to shrink from 0.203 at to 0.191 nm at . At the same time a strong spread in the interatomic distances in this shell is observed. Our data give support to the model proposed by Kötz et al. for the charge exchange reaction during a voltammogram cycle.
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Hüppauff et al. (1993) studied this question.
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