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Phosphoric Acid Doped Polybenzimidazole (PBI)/Zeolitic Imidazolate Framework Composite Membranes with Significantly Enhanced Proton Conductivity under Low Humidity Conditions

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	Escorihuela Fuentes, Jorge; Sahuquillo, Óscar; García Bernabé, Abel; Giménez, Enrique; Compañ, Vicente
	This document is a artículoDate2018
	The preparation and characterization of composite polybenzimidazole (PBI) membranes containing zeolitic imidazolate framework 8 (ZIF-8) and zeolitic imidazolate framework 67 (ZIF-67) is reported. The phosphoric acid doped composite membranes display proton conductivity values that increase with increasing temperatures, maintaining their conductivity under anhydrous conditions. The addition of ZIF to the polymeric matrix enhances proton transport relative to the values observed for PBI and ZIFs alone. For example, the proton conductivity of PBI@ZIF-8 reaches 3.1 x 10-3 S·cm-1 at 200 ºC and higher values were obtained for PBI@ZIF-67 membranes, with proton conductivities up to 4.1 x 10-2 S·cm-1. Interestingly, a composite membrane containing a 5 wt.% binary mixture of ZIF-8 and ZIF-67 yielded a proton conductivity of 9.2 x 10-2 S·cm-1, showing a synergistic effect on the proton conductivity.
	Escorihuela Fuentes, Jorge Sahuquillo, Óscar García Bernabé, Abel Giménez, Enrique Compañ, Vicente 2018 Phosphoric Acid Doped Polybenzimidazole (PBI)/Zeolitic Imidazolate Framework Composite Membranes with Significantly Enhanced Proton Conductivity under Low Humidity Conditions Nanomaterials 8 10 775
	https://doi.org/10.3390/nano8100775