STRUCTURAL AND ELECTROCHEMICAL PROPERTIES OF SOL-GEL DERIVED MO-CEO2,SI-MOCEO2 AND SI-CEO2 NANOCRYSTALLINE FILMS FOR ELECTROCHROMIC DEVICES

Mo:CeO2, Si:CeO2 and Mo: Si:CeO2 films were made by the sol-gel dip-co ating technique. XRD investigations of the analogously prepared powder s revealed that particle grain size of CeO2 with the addition of Mo, S i or both decreased. FT/IR spectra of the corresponding films showed t hat no separate Mo-oxide phase was formed while the Si containing CeO2 films had nanocrystallites of ceria as well as amorphous silica. Elec trochemical investigations (cyclic voltammetry, chronocoulometry) perf ormed in protic (0.1M LiOH) and aprotic (1M LiCiO(4)/propylene carbona te(PC)) electrolytes showed that additions of Mo:, Si: and Mo:Si:- to ceria increased ion storage ability. The suitability of films as optic ally passive counter electrodes was demonstrated by making electrochro mic cells with asymmetric and symmetric configurations using a Li+ dop ed ionic conductor (ormolyte(R)) and an electrochromic tungstophosphor ic acid (WPA)/TiO2 gel film.