Preparation and electrochemical properties of modified electrodes with Keggin-type silicotungstates and PEDOT

abstract

Hybrid organic/inorganic films composed of the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT), with Keggin type polyoxotungstates [SiW(12)O(40)](4-), [SiW(11)O(39)](8-), [SiW(11)Fe(III)(H(2)O)O(39)](5-) or (SiW(11)Co(II)(H(2)O)O(39)](6-) were synthesized by electrochemical polymerization in aqueous solution on the surface of glassy carbon electrodes. Cyclic voltammetry showed that the electrochemical behaviour of the polyoxometalates in the films was very similar to those in solution, and gave evidence of high electrochemical stability. Electrochemical impedance spectroscopy revealed that the charge transfer resistance increased with increasing pH and with more negative potentials. These modified electrodes were found to be very stable and could be used for at least 1 month without significant alterations. (C) 2011 Elsevier B.V. All rights reserved.

keywords

HYBRID MATERIALS POLYPYRROLE/PW12O403; CONDUCTING POLYMERS; ELECTROCATALYTIC REDUCTION; POLYOXOMETALATE COMPLEXES; ELECTROCHROMIC DEVICES; HOMOGENEOUS CATALYSIS; NETWORK FILMS; HETEROPOLYANIONS; POLYANILINE; REDOX

subject category

Chemistry; Electrochemistry

authors

Fernandes, DM; Brett, CMA; Cavaleiro, AMV

our authors

Groups

acknowledgements

The authors thank Fundacao para a Ciencia e a Tecnologia (FCT) for financial support (Project POCI 2010-Feder-POCI/QUI/56534/2004). D. Fernandes acknowledges FCT for her PhD grant SFRH/BD/30797/2006. Thanks are also due to CICECO and the University of Aveiro, and CEMUC (R) (Research Unit 285) University of Coimbra.

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".