V2O5-based thin films were prepared via the sol-gel method in order to obtain semiconductive films suitable as counter electrodes in electrochemical devices (e.g. electrochromic windows). Different metal precursors (nickel 2,4-pentanedionate, NiCl2, BiCl3, SbCl3) were added, after dissolution, into the starting vanadium oxo-triisopropoxide solution in the presence of acetic acid as a chelating agent. Preventing different synthesis conditions due to the ambient moisture, the hydrolysis reaction was carried out in controlled acidic conditions. Stable sols were obtained and thin films were dipped on transparent substrates coated with a conductive layer (ITO, SnO2:F). Different techniques were employed on as-prepared and heat treated (673 K) films, and the corresponding gels in order to characterize the microstructural, surface and electrochemical features of the samples. Better results were obtained for Ni/V oxides thin films: unless their charge capacity was not very high (similar to10 mC/cm(2)), their electrochemical stability was unchanged after 1000 cycles and their transmittance spectra showed high transparency (>80%) in all the visible region during both the intercalation and deintercalation steps. On the other hand, preliminary analysis on Sb/V mixed oxides showed a higher charge capacity but irreversible electrochemical reactions took place during the first working cycles.
Scheda prodotto non validato
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo
|Titolo:||Sol-gel synthesis of vanadate-based thin films as counter electrodes in electrochromic devices|
|Data di pubblicazione:||2003|
|Citazione:||Sol-gel synthesis of vanadate-based thin films as counter electrodes in electrochromic devices / Riccardo, Ceccato; Giovanni, Carturan; Decker, Franco; Florinda, Artuso. - 26:1-3(2003), pp. 1071-1074. ((Intervento presentato al convegno 11th International Workshop on Glasses, Cermics, Hydrids and Nanocomposites from Gels (Sol-Gel 2001) tenutosi a ABANO TERME, ITALY nel SEP 16-21, 2001.|
|Appare nella tipologia:||01a Articolo in rivista|