Abstract
In this study, dense composite electrolytes with different H3PO4 doping levels were fabricated. The conductivity property is optimized giving consideration to the influence of H3PO4 doping level. The result of SEM image indicates that the composite of 1P1S-7 is sufficiently dense. The conductivities increase with the order: σ (1P1S)<σ (1P1S-14)<σ (SMPO)<σ (1P1S-7). The highest conductivity of 1P1S-7 is observed in unhumidified air to be 4.4×10−2Scm−1 at 140°C. The H2/O2 fuel cell using 1P1S-7 as an electrolyte generates the maximum power density of 48.9mWcm−2 at 140°C. The result indicates that composite electrolyte comprised of 7wt% H3PO4-doped polytetrafluoroethylene and Sn0.95Mg0.05P2O7 (1P1S-7) is a promising composite electrolyte for intermediate temperature fuel cells.
Published Version
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