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

摘要

Electrosynthesis of poly(brilliant cresyl blue) in aqueous solution in the presence of Keggin-type polyoxotungstates, [SiW _(11)Fe(H _2O)O _(39)] ~(5-) or [SiW _(11)Co(H _2O)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.