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Various perfluorosulfonic acid membranes (PFSAs) were studied as pure and silicon oxide composite membranes for operation in hydrogen/oxygen proton-exchange membrane fuel cells (PEMFCs) from 80 to 140 o C. The composite membranes were prepared either by impregnation of pre-formed PFSAs via sol-gel processing of a polymeric silicon oxide, recasting a film using solubilized PFSAs and a silicon...
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