Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 51, Pages 35377-35389Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b13315
Keywords
flexible electrolytes; polyimidazolium ionic liquids; polybenzimidazole microsieves; cross-linking; microtransfer molding; proton transport
Funding
- Government of Aragon
- Education, Audiovisual, and Culture Executive Agency (EU-EACEA) [FPA 2011-0014, SGA 2012-1719]
- VI National R&D&i Plan - Instituto de Salud Carlos III
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Polymeric ionic liquids (PILs) have triggered great interest as all solid-state flexible electrolytes because of safety and superior thermal, chemical, and electrochemical stability. It is of great importance to fabricate highly conductive electrolyte membranes capable to operate above 120 degrees C under anhydrous conditions and in the absence of mineral acids, without sacrificing the mechanical behavior. Herein, the diminished dimensional and mechanical stability of poly[1(3H-imidazolium)ethylene]bis(trifluoromethanesulfonyl)imide has been improved thanks to its infiltration on a polybenzimidale (FBI) support with specific pore architecture. Our innovative solution is based on the synergic combination of an emerging class of materials and sustainable large-scale manufacturing techniques (UV polymerization and replication by microtransfer-molding). Following this approach, the PIL plays the proton conduction role, and the PBI microsieve (SPBI) mainly provides the mechanical reinforcement. Among the resulting electrolyte membranes, conductivity values above 50 mS.cm(-1) at 200 degrees C and 10.0 MPa as tensile stress are shown by straight microchannels of poly[1-(3H-imidazolium)ethylene]bis(trifluoromethanesulfonypimide cross-linked with 1% of dyvinylbenzene embedded in a PBI microsieve with well-defined porosity (36%) and pore diameter (17 mu m).
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