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

► Polyoxometalate-doped PEDOT modified electrodes were prepared by electrochemical polymerization. ► Fe and Co substituted Keggin-type polyoxotungstates were immobilized on the electrodes. ► The POM-doped PEDOT modified electrodes presented high stability. ► Cyclic voltammetry of the films showed redox processes occurring at W, Fe and Co. ► EIS study showed the effect of the introduction of the transition metal in the silicotungstate.