Study of Electrochromic Behavior of Conducting Polyaniline Film

Highly conducting polyaniline film is obtained by controlled-potential electrolyze at 0.5~0.6 V (vs.SCE) with Ni electrode (2.0 cm×3.0 cm). Doping agent, aniline concentrations, PH, electrolytic voltage are studied in detail. The best doping agent is HClO4, and the electrolytic system is CH3CN, HClO4, H2O system. Mechanism of electrochromic reaction is investigated by cyclic voltammetry at -0.2~0.8 V. The electrochromic region is yellow-green-blue and the conductivity of the film is 10-1s·cm-1.