Abstract
The present article describes the use of a less expensive non-perfluorinated polymer (polyvinyl alcohol, PVA), heteropolyacid (HPA), glutaraldehyde and 3-aminopropyltriethoxysilane (APTES) for the formation of high proton-conducting hybrid composite membranes. The conductivity of the PVA/PMA/Gl/APTES hybrid composite membranes was measured under varying conditions of temperature (from −20°C to 140°C) and relative humidity (from 30 to 90%). Conductivity values in the range of 10−3–10−1Scm−1 were obtained for the hybrid membranes. These free-standing flexible films were mechanically stable and the corresponding composite membranes were thermally stable up to 300°C. Their swelling ratio was calculated for dry and wet conditions at room temperature.
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