This report describes composite proton electrolytes composed of nanosize zirconium phosphate or antimonic acid particles suspended in a poly(vinyl acetate)/glycerin gel matrix. The proton conductivity was 10-3-10-4S/cm at room temperature, thermal stability prevailed up to at least 110 °C, and compatibility was found with oxide electrodes; these properties makes the electrolyte suitable for use in solid state electrochemical devices. The temperature dependence of the conductivity was found to obey the Williams-Landel-Ferry relationship at temperatures over 60 °C, thus suggesting that the ion conductivity in the composite electrolyte can be described by mechanisms normally taken to be valid for liquid ion conductors.
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