EXPERIMENTAL AND SIMULATED TRANSMITTANCE VERSUS POTENTIAL CURVES FOR POLY(O-METHOXYANILINE) FILMS

Experimental transmittance versus potential (T-E) curves were obtained for poly(o-methoxyaniline) electrochromic films in aqueous acidic med ium. T-E curves assumed different forms such as oval and figure-eight shapes, depending on the scan rate and the wavelength used during spec troelectrochemical experiments. A theoretical model was proposed to ex plain experimental results and to construct T-E curves by computer sim ulation. The model assumes current transients to be an exponential pro cess with a single relaxation time that explains the curve shapes. An alternative model using more than one relaxation time is commented on to describe more than one species of migrating ions and to produce a c loser fit.