BIBLIOS

Tipo
Artigos em Revista

Tipo de Documento
Artigo Completo

Título
Ion transfer dynamics of poly(3,4-ethylenedioxythiophene) films in deep eutectic solvents

Participantes na publicação
A. Robert Hillman (Author)
Karl S. Ryder (Author)
Virginia C. Ferreira (Author)
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Dep. Química e Bioquímica
Dep. Química e Bioquímica
CQB
Christopher J. Zaleski (Author)
Eric Vieil (Author)

Resumo
tMechanistic studies are reported for redox switching (doping/undoping) of Au-supported poly(3,4-ethylenedioxythiophene) (PEDOT) films exposed to LiClO4/CH3CN (a conventional electrolyte based ona molecular solvent) and to Ethaline and Propaline (two choline chloride-based deep eutectic solvent(DES) media). A combination of electrochemical, acoustic (quartz crystal microbalance, QCM) and optical(probe beam deflection, PBD) methods was used to monitor the exchange of mobile species betweenthe film and the bathing electrolyte. Qualitatively, film responses to a potentiodynamic control functionshowed that the redox switching mechanisms are quite different in all three media. When exposed toacetonitrile, anion transfer is dominant, with some accompanying solvent transfer but negligible cationtransfer; application of the convolution protocol allowed these transfers to be quantified. Analogousobservations in the DES media could be interpreted qualitatively in terms of dominant cation transfer,but the convolution protocol could not be used to quantify the contributions of individual species; inthese viscous media, this is a consequence of the long transit times from the film/solution interface to theoptical detection zone. Chronoamperometric experiments, in which the measurement time was an orderof magnitude (or more) longer permitted the diffusional processes driven by the polymer/DES interfacialpopulation changes to reach the optical detection zone.


Instituição
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Suporte
Electrochimica Acta

Identificadores da Publicação
ISSN - 0013-4686

Editora
Elsevier BV



Identificadores do Documento
DOI - https://doi.org/10.1016/j.electacta.2013.07.120
URL - http://dx.doi.org/10.1016/j.electacta.2013.07.120

Identificadores de Qualidade
SCIMAGO Q1 (2016) - 1.355 - Electrochemistry
SCOPUS Q1 (2012) - 1.651 - Electrochemistry
Web Of Science Q1 (2017) - 5.116 - ELECTROCHEMISTRY - SCIE

Keywords
Conducting polymer PEDOT Deep eutectic solvent QCM Probe beam deflection Ion transfer

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