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New hybrid membranes containing polyvinyl alcohol (PVA) and poly(tetramethylene oxide) (PTMO) with heteropolyacid (HPA) as a hydrophilic inorganic modifier in an organic/inorganic matrix were developed for low-temperature proton exchange membrane fuel cells (PEMFCs). A maximum conductivity of 4.8 × 10−3 S cm−1 was obtained at 80 °C and 75% RH for PVA/PWA/PTMO/H3PO4 (10/15/70/5 wt%), whereas the PVA/SiWA/MPTS/H...
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