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Electrochemical, UV–Vis, and microscopical characteristics of sol–gel CeO2:V2O5 thin film

  • R. D. C. Balboni
  • R. M. J. Lemos
  • E. A. Moura
  • C. M. Cholant
  • C. F. Azevedo
  • I. M. Caldeira
  • A. Gündel
  • W. H. Flores
  • A. Pawlicka
  • C. O. Avellaneda
Article
  • 66 Downloads

Abstract

Cerium dioxide (CeO2) and cerium dioxide doped with vanadium pentoxide (CeO2:V2O5) were synthesized from sol–gel precursors and deposited by spin coating on a conductive glass substrate (FTO). The films with different concentration of dopant and number of deposited layers were studied throughout cyclic voltammetry (CV), chronoamperometry/chronocoulometry, atomic force microscopy (AFM), scanning electron microscopy (SEM), and UV–Vis spectroscopy. The best value of charge density of 18.9 mC cm−2 was obtained for CeO2 doped with 15 mol% of V2O5 film. The chemical diffusion coefficient of lithium ions into CeO2 was 1.73 × 10−12 and CeO2:V2O5 15 mol% 6.75 × 10−13 cm2 s−1. This film presented 79% of transparency in UV–Vis and 5% color change under ± 1.3 V of applied potentials. Structural analyses revealed its homogeneous surface and the root mean-squared roughness (RMS) value of 9.42 nm. Based on the obtained results, CeO2 doped with 15 mol% V2O5 film is a promising thin coating for the use in electrochromic devices as a passive counter-electrode.

Notes

Acknowledgements

The authors are indebted to FAPERGS (Grant 12/2239-9) and Capes for the financial support given to this research.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • R. D. C. Balboni
    • 1
  • R. M. J. Lemos
    • 2
  • E. A. Moura
    • 3
  • C. M. Cholant
    • 1
  • C. F. Azevedo
    • 2
  • I. M. Caldeira
    • 1
  • A. Gündel
    • 4
  • W. H. Flores
    • 4
  • A. Pawlicka
    • 5
  • C. O. Avellaneda
    • 1
  1. 1.Centro de Desenvolvimento Tecnológico - CDTecUniversidade Federal de PelotasPelotasBrazil
  2. 2.Centro de Ciências Químicas, Farmacêuticas e de Alimentos - CCQFAUniversidade Federal de PelotasPelotasBrazil
  3. 3.Departamento de Física, Centro PolitécnicoUniversidade Federal do ParanáCuritibaBrazil
  4. 4.Universidade Federal do PampaBagéBrazil
  5. 5.IQSC-USPSão CarlosBrazil

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