Redox transformation of poly(o-aminophenol) (POAP) under continuous potential cycling

The aim of this work was to study the effect of prolonged potentiodynamic cycling (PPC) on the conducting properties of poly(oaminophenol) (POAP) film electrodes. PPC reduces strongly the electron and ion transport rates at POAP films. This effect is called here deactivation. Cyclic Voltammetry (CV)...

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Autor principal: Tucceri, Ismael Ricardo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Química
Poly(o-aminophenol) film electrodes
Prolonged potential cycling (PPC)
Deactivation
Charge-transport and charge-transfer parameters
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/98482
https://ri.conicet.gov.ar/11336/5041
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-98482
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Poly(o-aminophenol) film electrodes
Prolonged potential cycling (PPC)
Deactivation
Charge-transport and charge-transfer parameters
spellingShingle Química
Poly(o-aminophenol) film electrodes
Prolonged potential cycling (PPC)
Deactivation
Charge-transport and charge-transfer parameters
Tucceri, Ismael Ricardo
Redox transformation of poly(o-aminophenol) (POAP) under continuous potential cycling
topic_facet Química
Poly(o-aminophenol) film electrodes
Prolonged potential cycling (PPC)
Deactivation
Charge-transport and charge-transfer parameters
description The aim of this work was to study the effect of prolonged potentiodynamic cycling (PPC) on the conducting properties of poly(oaminophenol) (POAP) film electrodes. PPC reduces strongly the electron and ion transport rates at POAP films. This effect is called here deactivation. Cyclic Voltammetry (CV), Rotating Disc Electrode Voltammetry (RDEV) and Electrochemical Impedance Spectroscopy (EIS) were employed in this study. The attenuation of the voltammetric response of the polymer with the increase in the number of oxidation-reduction cycles allowed one to define a degree of deactivation. RDEV and EIS were employed to obtain dependences of charge-transport and charge-transfer parameters on the degree of deactivation of the polymer. RDEV data were interpreted on the basis of the electron hopping model. Impedance spectra of POAP films in the presence of an electroactive solution containing p-benzoquinone (Q) and hydroquinone (HQ) species were analyzed on the basis of an impedance model which considers a uniform and nonporous polymer film and no penetration of redox species into the film from the solution While diffusion coefficients for electron (De) and ion (Di) transport decrease, interfacial resistances related to ion (Ri f s) and electron (Rm f, Ref s) transfer across the different interfaces involved in the metal/polymer film/solution system increase as the degree of deactivation increases. The slower electron transport with the increase in the degree of deactivation was attributed to the increase of the electron hopping distance between redox sites. Transport parameters, such as, Rif s and Di, were associated with proton movements. POAP films maintain their conducting properties almost unaltered for about 500 potential cycles at a scan rate of 0.010 V s-1. However, a loss of conductivity was observed as the number of potential cycles was extended beyond 500.
format Articulo
Articulo
author Tucceri, Ismael Ricardo
author_facet Tucceri, Ismael Ricardo
author_sort Tucceri, Ismael Ricardo
title Redox transformation of poly(o-aminophenol) (POAP) under continuous potential cycling
title_short Redox transformation of poly(o-aminophenol) (POAP) under continuous potential cycling
title_full Redox transformation of poly(o-aminophenol) (POAP) under continuous potential cycling
title_fullStr Redox transformation of poly(o-aminophenol) (POAP) under continuous potential cycling
title_full_unstemmed Redox transformation of poly(o-aminophenol) (POAP) under continuous potential cycling
title_sort redox transformation of poly(o-aminophenol) (poap) under continuous potential cycling
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/98482
https://ri.conicet.gov.ar/11336/5041
work_keys_str_mv AT tucceriismaelricardo redoxtransformationofpolyoaminophenolpoapundercontinuouspotentialcycling
bdutipo_str Repositorios
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