Mesoporous amorphous tungsten oxide electrochromic films: a Raman analysis of their good switching behavior

作者: Dafni Chatzikyriakou , Natacha Krins , Bernard Gilbert , Pierre Colson , Jennifer Dewalque

DOI: 10.1016/J.ELECTACTA.2014.05.139

关键词: Intercalation (chemistry)Inorganic chemistryElectrochromismAmorphous solidMesoporous materialRaman spectroscopyThin filmLithiumCyclic voltammetryMaterials scienceChemical engineering

摘要: The intercalation and de-intercalation of lithium cations in electrochromic tungsten oxide thin films are significantly influenced by their structural surface characteristics. In this study, we prepared two types amorphous via the sol-gel technique: one dense mesoporous order to compare response upon de-intercalation. According chronoamperometric measurements, Li+ intercalates/de-intercalates faster film (24s/6s) than (48s/10s). electrochemical measurements (cyclic voltammetry chronoamperometry) also showed worse reversibility for compared film, giving rise important trapping remaining coloration film. Raman analysis that provides more accessible various W-O bonds intercalation. On contrary, first insertion de-insertion selectively reacts with a few preferentially intercalates into pre-existing crystallites form stable irreversible LixWO3 bronze.

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