The redox processes of the [Fe(CN)6]3- 4- couple mediated by polyaniline films were studied by steady-state, ac and EHD impedance methods. At pH < 1, charging and discharging of the polymer capacitance in parallel with the faradaic impedance of the substrate reaction, occurring at the polymer-electrolyte interface, are the processes which determine the transient behaviour. Neither the charge transport across the film nor the charge-transfer kinetics of either the substrate or the polymer are experimentally accessible. At less acidic pHs (~ 3), a low frequency phenomenon detected in EHD experiments seems to be associated with surface protonation equilibria.
An AC and electrohydrodynamical (EHD) investigation of redox processes occurring at polyaniline coated electrodes.
1989
Abstract
The redox processes of the [Fe(CN)6]3- 4- couple mediated by polyaniline films were studied by steady-state, ac and EHD impedance methods. At pH < 1, charging and discharging of the polymer capacitance in parallel with the faradaic impedance of the substrate reaction, occurring at the polymer-electrolyte interface, are the processes which determine the transient behaviour. Neither the charge transport across the film nor the charge-transfer kinetics of either the substrate or the polymer are experimentally accessible. At less acidic pHs (~ 3), a low frequency phenomenon detected in EHD experiments seems to be associated with surface protonation equilibria.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
