Table 1. Physicochemical Properties of the Thin Fiber Composite and Pristine PFSA Membranes.

membrane	IEC [mmol g–1]	water content [%]	proton conductivity [mS/cm]
			@ 80 °C, 40% RH	@ 80 °C, 90% RH
PFSA composite (5 wt % thin fiber)	1.3	35	4.3	8.3
PFSA composite (10 wt % thin fiber)	1.3	36	5.0	8.7
PFSA composite (15 wt % thin fiber)	1.3	35	6.2	8.6
pristine PFSA	1.3	36	4.0	8.2
PVDF composite (15 wt % thin fiber)	1.0	27		2.9