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The electrochemical growth of Ir oxide in acidic, neutral, and basic LiClO 4 solutions has been investigated. Dissolution of the oxide during growth is much less in these LiClO 4 solutions than in H 2 SO 4 solutions, which have generally been used for Ir oxide growth, and this allows higher growth rates to be achieved. The oxide films grown in LiClO 4 solutions have a greater mechanical stability and appear to be less hydrated than those grown in H 2 SO 4 solutions. The empirical formula weight of the oxidized form of Ir oxide, grown in neutral LiClO 4 and dried in air, was found to be 260 ± 10 , indicative of an empirical formula of IrO 2 · 2 H 2 O . The potential at which the oxide is oxidized to an extent of one electron per Ir atom (in the oxide) has also been determined for various media. This allows the future determination of the Ir content of Ir oxide films by cyclic voltammetry.
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Pickup et al. (1988) studied this question.
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