The peak proton conductivity of aligned SPFSGF-5 membrane at 120 C under 20% RH is 11.13 mS cm
À1, which is 1.44 fold better than that of pristine SP membrane (7.68 mS cm À1 ). In contrast, under identical operating conditions, the Nafion-112 membrane exhibited a peak proton conductivity of 9.78 mS cm À1 , a 1.13 fold lower conductivity compared to aligned quadratic hybrid membrane. Furthermore, the aligned quadratic hybrid membrane exhibited lower H 2 and O 2 gas permeability compared to pristine SP and unaligned quadratic hybrid membranes.
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