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

Abstract

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/WO3׀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 cm2/C. The ECD displays fast response time for coloration (tc ) is 0.29 s. Upon reversal of potential bleaching (tb ) forms within 3 s. The findings demonstrated that this SPE electrolyte has promising candidate for use in optoelectronic applications.