Development and characterization of poly(3,4-ethylenedioxythiophene)-coated poly(methylene blue)-modified carbon electrodes

► Electrosynthesis of PEDOT-coated poly(methylene blue) films on carbon electrodes. ► Electrosynthesis conditions by fixed potential or potential cycling and electrolyte optimized. ► Redox behaviour of poly(methylene blue) unaffected by PEDOT. ► Characterization by cyclic voltammetry and electrochemical impedance spectroscopy. ► PEDOT improves stability of poly(methylene blue) modified electrodes for sensors.