Valency and Structure of Iridium in Anodic Iridium Oxide Films
- 1 March 1993
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 140 (3) , 598-602
- https://doi.org/10.1149/1.2056127
Abstract
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.Keywords
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