The effect of different electrochemical treatments on the conduction properties of an electroactive polymer: the case of poly(o-aminophenol)

R. TUCCERI

Current Topics in Electrochemistry

Research Trends

Lugar: Trivandrum; Año: 2017 vol. 19 p. 113 - 138

0972-4443

The effect of storage time without use (STWU) in thesupporting electrolyte solution on the conducting properties of poly(o-aminophenol) (POAP) film electrodeswas studied. cyclic voltammetry (CV), rotating disc electrode voltammetry(RDEV), electrochemical impedance spectroscopy (EIS) and surface resistance(SR) were employed. The storage of a POAP film without use for time periodslonger than 32 h strongly reduces its electroactivity. Here, this effect iscalled deactivation. The attenuation of the voltammetric response of thepolymer film with the increase of the storage time allows one to define adegree of deactivation (θd). Adecrease of the electron transport rate (De)with the increase of the degree of deactivation of POAP films was obtained fromRDEV measurements. The relative surface resistance change (DR/R)of a gold film coated with POAP is also attenuated by the increase of the STWU.Impedance spectra of deactivated and nondeactivated POAP films in the presenceof an electroactive solution and in the sole presence of the supportingelectrolyte were analyzed on the basis of two different impedance models. The deactivation of POAP films by the STWUstudied in this work was compared with deactivations caused by otherelectrochemical and chemical treatments, such as prolonged potential cycling(PPC), high positive potential limits (HPPL) and soaking in a ferric ionsolution (SFeIS).