IN-SITU RESONANCE RAMAN MEASUREMENTS OF A HYBRID ELECTROCHROMIC CELL WITH A GEL REDOX (I3-/I-) ELECTROLYTE
LADIR UMR 7075 CNRS & Paris VI University, 2 Rue Henry Dunant, 94320 Thiais, France
A hybrid electrochromic (HEC) device was constructed from optically active nanocrystalline WO3 film and transparent platinised SnO2:F-glass electrodes encapsulating a gel redox electrolyte. The electrolyte was prepared from an organic-inorganic ICS-PPG precursor that was synthesized from bis end-capped triethoxy silane and poly(propyleneglycol)-bis-(2-amino-propyl)ether (MW = 4000). KI and I2 in a molar ratio KI:I2 = 10:1 were a source of an I3-/I- redox pair while valeric acid was used as a catalyst for the solvolysis reactions of the ICS-PPG precursor. The stability and kinetics of colouring/bleaching changes of the HEC device were determined by using in-situ UV-visible spectroelectrochemical measurements between +2 and –2 V (CV, CC).