On the incorporation of protic ionic liquids imbibed in large pore zeolites to polybenzimidazole membranes for high temperature proton exchange membrane fuel cells

► Synergic combination between H3PO4, PBI and IL3 imbibed in NaY. ► IL3 molecules leached out from NaY crystals contribute to the conduction outperformance. ► H+/H2 transport selectivity values higher than PBI and hybrid NaY-PBI counterparts. ► Proof of concept demonstration in H2/O2 single cell up to 180 °C under non humidified conditions. ► I-V improvement performance values over pristine PBI ranging from 20% up to 100%.