Abstract
Proton-conducting composite membranes were fabricated by blending S n0.95 Al 0.05 P 2 O 7 having an excess of phosphates with polybenzimidazole (PBI) and polytetrafluoroethylene (PTFE). The addition of PBI to Sn 0.95 Al 0.05 P 2 O 7 -P x O 7 powder stabilized the conductivity of the composite, providing higher conductivities than those of stoichiometric Sn 0.05 Al 0.05 P 2 O 7 The addition of PTFE to Sn 0.95 Al 0.05 P 2 O 7 -P x O y -PBI powder reduced the conductivity but increased the tensile strength. The resulting composite membrane exhibited a conductivity of 0.04 S cm -1 at 200°C and a tensile strength of 2.30 MPa. Moreover, a fuel cell made with this composite membrane yielded high power densities exceeding 200 mW cm -2 above 100°C and good durability under unhumidified conditions.
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