Comparative Study of Cyclic Voltammetry and Cycle Stability of Electropolymerized Poly (3, 4-ethylenedioxythiophene) Poly (sodium 4-styrenesulfonate) on Screen-Printed Electrodes in Aqueous Media

Poly (3,4-ethylenedioxythiophene) poly(sodium 4-styrenesulfonate) (PEDOT:PSS) electropolymerized and deposited onto screen-printed carbon electrodes (SPCEs) and screen-printed platinum electrodes (SPPEs) was studied for anodic/cathodic peak current and cycle stability. Cyclic voltammetry (CV) shows that the redox ability of SPCEs electropolymerized with PEDOT:PSS (PEDOT:PSS/SPCEs) was significantly improved in comparison to SPPEs electropolymerized with PEDOT:PSS (PEDOT:PSS/SPPEs; the peak current difference of oxidation and reduction (ΔI) for PEDOT:PSS/SPCEs was ~3 times higher than that of PEDOT:PSS/SPPEs (ΔISPCE = 350 µA, ΔISPPE = 125 µA). Oxidation and reduction peak current of the CVs showed that both electrodes could maintain electrode integrity for over 30 days. The results suggest that the electropolymerized PEDOT:PSS had good adhesion to SPCE and SPPE surfaces. There was an insignificant change in the cycle stability curve after 3000 cycles compare to the initial cycle and an insignificant change in the cycle stability curve after 30 days in comparison to the first day for booth electrodes. The results suggest that electrode integrity of both PEDOT:PSS/SPCEx and PEDOT:PSS/SPPEx was maintained after repetitive CV cycles in aqueous media .