Photoelectrochemical properties of PAni-DBSA/EPDM blends

We report on studies concerning the photoelectrochemical behavior of a proc essed film of PAni-DBSA blended with EPDM in a photoelectrochemical device constructed using poly(ethylene oxide-co-epichlorohydrin)/NaI-I-2 as polyme ric electrolyte and a platinum counter electrode. Under open-circuit condit ions, the anodic photocurrent obtained was 1 muA cm(-2). In this condition and at positive bias, PAni behaves as n-type semiconductor. However at nega tive bias, an inversion of photocurrent signal confirms the p-type behavior of the polymer. The photocurrent is not limited by redox couple diffusion up to 60 mWcm(-2), after this point the transport time of ionic charge carr iers is higher than the generation time of electronic charge carriers.