Crystallized V2O5 as Oxidized Phase for Unexpected Multicolor Electrochromism in V2O3 Thick Film
| Autor: | Issam Mjejri, Aline Rougier, Christine Labrugère, Manuel Gaudon, Giljoo Song |
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| Přispěvatelé: | Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Plateforme Aquitaine de Caractérisation des Matériaux (PLACAMAT), Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2018 |
| Předmět: |
In situ
Materials science Energy Engineering and Power Technology Vanadium chemistry.chemical_element 02 engineering and technology Vanadium oxides 010402 general chemistry Electrochemistry Doctor Blade 01 natural sciences Vanadium oxide X-ray photoelectron spectroscopy Materials Chemistry Chemical Engineering (miscellaneous) Electrical and Electronic Engineering Spectroscopy Optical properties [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical engineering chemistry Polyol synthesis Electrochromism Electrochromism materials Cyclic voltammetry 0210 nano-technology |
| Zdroj: | ACS Applied Energy Materials ACS Applied Energy Materials, ACS, 2018, 1 (6), pp.2721-2729. ⟨10.1021/acsaem.8b00386⟩ |
| ISSN: | 2574-0962 |
| Popis: | International audience; Our e-connected society is eager to develop devices with tunable colors. Electrochromic materials, able to modify their optical properties under an applied voltage, offer a smart solution. In the present study, we have successfully synthesized two vanadium oxide powders from a polyol mediated synthesis and powder suspensions were coated on glass/ITO substrates by doctor blading. The electrochemical and optical properties of the VxOy films are investigated by cyclic voltammetry (CV) coupled with in-situ UV–Visible spectroscopy. Both V2O5 and V2O3 films exhibit reasonably good cycling stability, significant reflectance modulation, high optical contrast and good memory effects revealing the unknown EC properties of V2O3. The similar green ⇄ blue ⇄ orange reversible color changes for both vanadium oxides appears suitable for display application. Then, the evolution of the vanadium cation oxidation states and of the structure of V2O5 and V2O3 upon cycling are analyzed by ex-situ XPS and ex-situ XRD (at grazing incident angle). This work highlights a robust and novel scenario upon cycling, nearly the same whatever the raw film composition that shows, for each cycle, the crystallization of V2O5 upon oxidation, followed by amorphization upon reduction. |
| Databáze: | OpenAIRE |
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