Reversible electrochromic performance of Prussian blue coated with proton conductive Ta2O5·nH2O film

Yoshitsugu Sone, Akira Kishimoto, Tetsuichi Kudo, Kotaro Ikeda

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Electrochromism of Prussian blue (PB) involving proton insertion/extraction was investigated in an aqueous HCl solution using a Ta2O5·nH2O/PB laminate, formed by spin-coating a peroxo-polytantalate solution on an electrodeposited PB film. Reversible and stable electrochromic performance was observed with more than 10000 repeated coloring and bleaching cycles, demonstrating that the film of Ta2O5·nH2O serves as a proton-conductive protecting layer to prevent PB from dissolving in a strong acid solution. Insertion behavior of proton into the PB framework is compared with those for K+, Rb+ and Cs+ by means of a cyclic voltammogram and equilibrium potential measurements. The equilibrium potentials measured as a function of the degree of intercalation have shown that the maximum accommodation of proton is 3.0 (per Fe3+4[Fe11(CN)6]3 unit), which is in agreement with K+ and Rb+. However, the potential-composition curve observed with the PB-proton system is quite different from others not only in the potential range but also in shape, featuring by a conspicuous inflection at the middle region of the intercalation level. The intercalation behaviors are also discussed using a lattice statistical model.

Original languageEnglish
Pages (from-to)135-143
Number of pages9
JournalSolid State Ionics
Issue number1-2
Publication statusPublished - Jan 1996
Externally publishedYes


  • Electrochromic display
  • Electrochromism
  • Electrodeposition
  • Peroxo-polytantalate
  • Proton conductor
  • Prussian blue
  • Spin-coating
  • Tantalum oxide

ASJC Scopus subject areas

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


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