Li+ doped chitosan-based solid polymer electrolyte incorporated with PEDOT:PSS for electrochromic device

In this study, solid polymer electrolyte (SPE) based on chitosan (Ch) was prepared with addition of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) , lithium trifluro methane sulfonate (LiTRIF),  propylene carbonate (PC) by solvent casting technique. The chitosan-based polymer electrolyte was characterized using electrochemical impedance spectroscopy (EIS). The ionic conductivity value was calculated as 4.2 x 10 -4 S/cm. The SPE having good ionic conductivity was used to fabricate electrochromic device with glass/ITO/WO 3 ׀ PEDOT:PSS-Ch-LiTRIF-PC ׀ ITO/glass whose performance was evaluated via cyclic voltammetry, transmittance, repeating chronoamperometry. The optical contrast of ECD was attained as 22% at 800 nm, which resulting in coloration efficiency of 67 cm 2 /C. The ECD displays fast response time for coloration (t c ) is 0.29 s. Upon reversal of potential bleaching (t b ) forms within 3 s. The findings demonstrated that this SPE electrolyte has promising candidate for use in optoelectronic applications.