Nanostructured electrolyte membranes based on zeotypes, protic ionic liquids and porous PBI membranes: Preparation, characterization and MEA testing

作者：Eguizabal A; Lemus J; Roda V; Urbiztondo M; Barreras F; Pina M P^*

来源：International Journal of Hydrogen Energy, 2012, 37(8): 7221-7234.

DOI：10.1016/j.ijhydene.2011.11.074

• High temperature H-2 PEMFC
• Nanostructured electrolyte membranes
• Porous polybenzimidazole membranes
• Functionalized zeotypes
• Protic ionic liquids
• H-2/O-2 proof of concept

An innovative electrolyte membrane concept based on the synergic combination of randomly porous doped PBI membranes 80% in porosity containing H-3-methylimidazolium bis(trifluoromethanesulfonyl)imide as intrinsic proton conductor and microporous ETS-10 coatings as diffusional barriers has been developed for High Temperature PEMFC applications. The preparation route, involving up to 5 different steps, has been carefully optimized based on the evaluated proton conductivity and durability properties in presence of humidity at temperatures above 150 degrees C. The proton/methanol transport selectivity values of the optimized nanostructured membranes at 50 degrees, 100 degrees and 150 degrees C clearly outperform dense PBI and Nafion counterparts used as references. Moreover, the H-2 permeability values for both the optimized nanostructured electrolyte membrane and dense PBI are quite similar at the examined conditions; indicating the suitability of the preparation procedure in terms of fuel cross-over. Finally, the as prepared membranes have been validated in H-2/O-2 single cell under non humidified conditions up to 180 degrees C as a %26quot;proof of concept%26quot; demonstration.

• 出版日期2012-4