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.
|Number of pages||12|
|Publication status||Published - 2005|
|Event||Proton Conducting Membrane Fuel Cells III - Proceedings of the International Symposium - Salt Lake City, UT, United States|
Duration: 2002 Oct 21 → 2002 Oct 23
|Conference||Proton Conducting Membrane Fuel Cells III - Proceedings of the International Symposium|
|City||Salt Lake City, UT|
|Period||02/10/21 → 02/10/23|