Normalized intensity / a.u.
5 pm
Left: confocal depth scan through a Nafion XL membranę in hydrated State. Middle: confocal depth scan through a single reinforcement PVDF-HFP/PVP fiber embedded in Nafion ionomer. Due to the high ratio of hydrophilic PVP in the fiber, the water content in the fiber is significantly higher compared to the surrounding Nafion. Right: coulombic efficiencies of FIMT-PMBI and Nafion XI.