Effects of Supporting Electrolytes on Spectroelectrochemical and Electrochromic Properties of Polyaniline‐poly(styrene sulfonic acid) and Poly(ethylenedioxythiophene)‐poly(styrene sulfonic acid)‐based Electrochromic Device

Electrochromic devices are fabricated by using polyaniline (PANI) doped with poly(styrene sulfonic acid) (PSS) as coloring electrodes, poly(ethylenedioxythiophene)-poly(styrene sulfonic acid) (PEDOT-PSS) as complementary electrodes, and hybrid polymer electrolytes as gel electrolytes. The device based on LiClO4-based electrolyte (weight ratio of PMMA:PC:LiClO4 = 0.7:1.1:0.3) shows the highest optical contrast and coloration efficiency (333 cm 2 /C) after 1200 cycles in these devices, and the color changes from pale yellow (0.5 V) to dark blue (+2.5 V). The spectroelectrochemical and electrochromic switching properties of electrochromic devices are investigated, the maximum optical contrast (T%) of electrochromic device for ITO|PANI-PSS||PMMA-PC-LiClO4-SiO2||PEDOT-PSS|ITO are 31.5% at 640 nm, and electrochromic device based on LiClO4-based electrolyte with SiO2 shows faster response time than that based on LiClO 4-based electrolyte without SiO2.