An all solid-state electrochromic device (ECD) using polyaniline (PANI)for
anodic coloration and tungstic acid WO3, 2 H2O for cathodic coloration,sepa
rated by a polymer electrolyte (PAMPS) presents very good performances. To
check the sequences of the protonation/deprotonation and oxidation /reducti
on reactions arising in the two optically active materials, Raman spectrosc
opy was used on the two sides of the ECD. An improvement of the PANI crysta
lline order due to the interfacing with PAMPS, especially using PANI doped
with camphorsulfonic acid (PANI-CSA) is observed, which is one of the: reas
ons of the excellent performances of the device. The free electrons injecti
on in the device, which is the key of their good reversibility, is ensured
at high potentials by the cathodic tungsten bronze, and at moderate potenti
als by the anodic leucoemeraldine salt.