Proton-conducting hybrid solid electrolytes for intermediate temperature fuel cells

Hitoshi Nakajima, Itaru Honma

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)


A new family of proton-conducting/inorganic hybrid polymer electrolyte membrane was prepared by sol-gel processes. The method involves stabilization of metastable acidic tungsten oxide cluster in the polymer composite membrane. A freestanding, flexible and pale-yellowish transparent membrane was formed from tungsten acidic homogeneous solution by sol-gel condensation with alkoxysilylated polyethylene oxide (PEO). The membrane showed very high protonic conductivity of 10-2 -10-3 S cm-1 from R.T. to 120 °C, especially, 1.4 × 10-2 S cm-1 at 80 °C. The structure of tungsten cluster moieties was neither peroxo complex nor WO3 · 2H2O. It is suggested that nano-size clusters are dispersed homogeneously in polymer matrix without long-range ordering. Tungsten complexes with carboxylate ligands such as malonic acid could form similar homogeneous membrane. Thermal and ionic transport properties could be controlled by this family of organic derivatives.

Original languageEnglish
Pages (from-to)607-610
Number of pages4
JournalSolid State Ionics
Issue number3-4
Publication statusPublished - 2002 Jun
Externally publishedYes


  • Fuel cell
  • Polyethylene oxide
  • Proton

ASJC Scopus subject areas

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


Dive into the research topics of 'Proton-conducting hybrid solid electrolytes for intermediate temperature fuel cells'. Together they form a unique fingerprint.

Cite this