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Optically passive cerium containing counter-electrodes for electrochromic devices

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Abstract

Electrochemical and optical behavior of sputter deposited CeO2, Ce-Zr mixed oxide and Ce-V mixed oxide thin films are reported. The films were deposited starting from a target prepared by mixing and weakly pressing the oxide powders in the desired molar ratio. Li intercalation was accomplished from a liquid electrolyte. CeO2 and Ce-Zr mixed oxide thin films are transparent in the visible range and behave as passive material upon oxidation/ reduction. During the cyclic voltammetries performed on the thin films a charge of few mC was reversibly cycled. The diffusion coefficient was evaluated from galvanostatic intermittent titration technique (GITT) experiments.

Ce-V mixed oxide thin films showed a mixed anodic/cathodic behavior passing through a transparent state. The charge reversibly inserted during cyclic voltammetry at 10 mV/s was as high as 22 mC/cm2 for a 107 nm thick film and ranks Ce-V mixed oxide among the most promising materials for electrochromic devices.

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Authors and Affiliations

  1. University of Rome “La Sapienza” Chemistry Dep., P.le A. Moro 5, I-00185, Roma, Italy

    F. Varsano & F. Decker

  2. Thin Films Optics Lab., ENEA —Casaccia, Via Anguillarese 301, I-00060, Roma, Italy

    E. Masetti

Authors
  1. F. Varsano
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  2. F. Decker
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  3. E. Masetti
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Varsano, F., Decker, F. & Masetti, E. Optically passive cerium containing counter-electrodes for electrochromic devices. Ionics 5, 80–85 (1999). https://doi.org/10.1007/BF02375908

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  • DOI: https://doi.org/10.1007/BF02375908

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