A study of the conducting properties of poly(o-aminophenol) after deactivation by storage without use in the supporting electrolyte solution

R. TUCCERI

Conferencia; ICSM 2016 (Intenational Conference on Science sand Technology of Synthetic Metals),; 2016

ICSM 2016 (Intenational Conference on Science sand Technology of Synthetic Metals),

The effect of storage time without use (STWU) in thesupporting electrolyte solution on the charge-transport parameters of poly(o-aminophenol) (POAP) film electrodeswas studied by electrochemical impedance spectroscopy (EIS) [1]. STWU decreasesthe charge transport rate of the polymer. This effect is herein calleddeactivation. Impedance diagrams of both nondeactivated and deactivated filmsin contact with a solution containing the p-benzoquinone/hydroquinoneredox couple were interpreted on the basis of a model formulated forhomogeneous conducting polymers, where the bathing electrolyte contains a redoxpair that provides the possibility for electrons to leak from the film surface.Dependences of diffusion coefficients for electron (De) andion (Di) transport and interfacial resistances related to ion(Rif|s) and electron (Rm|f, Ref|s) transfer across thepolymer/solution and metal/polymer interfaces, respectively, on the degree ofdeactivation (θd) of thepolymer were obtained. These dependences were compared with those from previouswork for POAP films deactivated by employing other procedures, such as highpositive potential limits (HPPL), soaking in a ferric ion solution (SFeIS) andprolonged potential cycling (PPC).  Fig.1. Ion diffusion coefficient (Di) as a function of qd for a POAP film deactivated by STWU.Electrolyte: 0.1 MHClO4 + 0.4 MNaClO4 + 2 x 10-3 M (HQ/Q) solution. Inset: Dias a function of qd for the different deactivation processes. [1]       R. Tucceri, ?Deactivation ofpoly(o-aminophenol) film electrodes by storage without use in the supportingelectrolyte solution and its comparison with other deactivation processes. A studyemploying EIS, Journal of AppliedElectrochemistry, Vol. 45, No. 10, (2015),pp 1123-1132.