Proton conductivity of spin-coated Ta2O5·nH2O amorphous thin films from peroxo-polytantalate solution

Y. Sone, A. Kishimoto, T. Kudo

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Peroxo-polytantalic acid (Ta-IPA) was obtained by a direct reaction of Ta(OC2H5) with H2O2. Using its water-based solution, amorphous thin films with excellent homogeneity could easily be fabricated on ITO-glass substrates by a conventional spin-coating technique. Electrical conductivity of this sample was measured with an ac impedance method, revealing that both temperature and humidity dependences of ionic conductivity (ca. 4.0×10-1 S cm-1 at 20°C) were quite small. Furthermore, all solid state ECD prototype was fabricated by combining this film electrolyte with electrochromic film (hydrous tungsten oxide film derived from peroxo-polytungstic acid). Electrochromic characteristics of this all solid state device were favorable.

Original languageEnglish
Pages (from-to)53-59
Number of pages7
JournalSolid State Ionics
Issue number1-2
Publication statusPublished - Oct 1993
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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