Abstract
We prepared structurally stable organic-inorganic hybrid ionomer membrane in which nano-sized solid proton conductors were uniformly dispersed in an ion exchange polymer matrix. Nafion membrane was in-situ doped with zirconium hydrogen phosphate (ZHP) after phase-separated hydrophobic porogen, dibutyphthalate, was leached out from Nafion membrane by diethyl ether and methanol co-solvent. FE-SEMicrographs showed that nanoporous structure in Nafion membrane was well developed by the solvent extraction process, and the pores were completely filled with in-situ doped ZHP particles. It was confirmed by FTIR study that hydrophilic ZHP fillers improved water retention of composite ionomer membrane at high temperature regions above 100°C. Consequently, the high temperature conductivity of Nafion/ZHP membranes was much higher than that of neat Nafion membrane.
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