Modified electrodes with Keggin-type silicotungstates and poly(brilliant cresyl blue)

resumo

Electrosynthesis of poly(brilliant cresyl blue) in aqueous solution in the presence of Keggin-type polyoxotungstates, [SiW11Fe(H2O)O-39](5-) or [SiW11Co(H2O)O-39](6-), was used to prepare modified glassy carbon electrodes. The deposited hybrid organic/inorganic films were studied and characterised by cyclic voltammetry and electrochemical impedance spectroscopy. Cyclic voltammetry showed that the electrochemical features of the polyoxoanions were maintained after immobilisation, with the first tungsten reduction peak involving the uptake of protons from the solution. The chemically modified electrodes were stable, and their preparation was easy to perform. The results provide valuable information for exploring future applications of these films in electrochemical sensors or electrocatalysis.

palavras-chave

IRON-SUBSTITUTED HETEROPOLYTUNGSTATE; GLASSY-CARBON ELECTRODE; MULTILAYER FILMS; POLYOXOMETALATE COMPLEXES; ELECTROCHEMICAL-BEHAVIOR; HOMOGENEOUS CATALYSIS; SENSITIVE LAYER; NITRITE IONS; HYBRID FILMS; POLYMER

categoria

Electrochemistry

autores

Fernandes, DM; Brett, CMA; Cavaleiro, AMV

nossos autores

Grupos

agradecimentos

The authors thank CICECO and the University of Aveiro and CEMUC (R) of the University of Coimbra (Research Unit 285, FCT), Portugal. Diana Fernandes acknowledges FCT for her PhD grant SFRH/BD/30797/2006.

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