A new proton conductive membrane - Tungsten peroxo complex doped sol-gel organic/inorganic nanocomposite polymer

Hitoshi Nakajima, Itaru Honma

Research output: Contribution to conferencePaperpeer-review

Abstract

New family of proton conducting organic/inorganic hybrid polymer electrolyte membrane was prepared by sol-gel processes. The method involves the stabilization of metastable acidic tungsten oxide cluster in the polymer composite membrane. A free-standing, flexible and pale-yellowish transparent homogeneous membrane was formed from tungsten acidic homogeneous solution by sol-gel condensation with alkoxysilylated polyethylene oxide. 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 under 100% R. H. The structure of tungsten cluster moieties was neither peroxo complex nor WO3.2H2O, shown by infrared red and powder X-ray spectra. It is suggested that nanosize 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 these families of organic derivatives.

Original languageEnglish
Pages388-399
Number of pages12
Publication statusPublished - 2005 Dec 13
Externally publishedYes
EventProton Conducting Membrane Fuel Cells III - Proceedings of the International Symposium - Salt Lake City, UT, United States
Duration: 2002 Oct 212002 Oct 23

Other

OtherProton Conducting Membrane Fuel Cells III - Proceedings of the International Symposium
Country/TerritoryUnited States
CitySalt Lake City, UT
Period02/10/2102/10/23

ASJC Scopus subject areas

  • Engineering(all)

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