Abstract
Phosphoric acid-doped composites based on cardo polybenzimidazole and hydrated silicon dioxide have been synthesized. The effect of synthesis conditions on the properties of the resulting composites has been investigated. The silicon dioxide-modified membranes have a higher proton conductivity. Hydrated silicon dioxide substantially suppresses phosphoric acid washout from the hybrid membranes exposed to water vapor. The diffusion permeability of the composite membranes has been measured in solutions of various salts. Some membranes samples have been tested under fuel cell operation conditions.
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