Observation of electrochromism in solid‐state anodic iridium oxide film cells using fluoride electrolytes

Thin film cells of composition SnO2/AIROF/fluoride/Au have been constructed, where AIROF is anodic iridium oxide film and fluoride is PbF2 on PbSnF4. These devices exhibit reversible electrocoloration and bleaching, with response times as low as 0.1 sec. The behavior of these cells is consistent with the anion insertion mechanism for AIROF electrochromism.