SOLID-STATE ELECTROCHROMIC CELL WITH ANODIC IRIDIUM OXIDE FILM ELECTRODES

A new solid-state electrochromic cell has been fabricated using an anodic iridium oxide film (AIROF) display electrode. The cell has the symmetric sandwich structure AIROF∥Nafion∥AIROF, with the Nafion solid electrolyte opacified by an in situ precipitation technique. A symmetric square-wave voltage of 1.5 V amplitude produces clearly perceivable color changes from pale to dark blue-gray in ≈1 sec when viewed in diffuse reflection. Good open-circuit optical memory is exhibited: (typical loss in attenuation of 8%/day).