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Open AccessArticle

Polyimide/Ionic Liquid Composite Membranes for Middle and High Temperature Fuel Cell Application: Water Sorption Behavior and Proton Conductivity

1
Polymères Biopolymères Surfaces (PBS), Normandie University, UNIROUEN, INSA ROUEN, CNRS, 76000 Rouen, France
2
Institute of Bioorganic Chemistry and Petrochemistry, National Academy of Science of Ukraine, 50, Kharkivske Schose, 02160 Kyiv, Ukraine
3
Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine, 17, General Naumov St., 03164 Kyiv, Ukraine
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(5), 82; https://doi.org/10.3390/membranes10050082
Received: 8 April 2020 / Revised: 23 April 2020 / Accepted: 26 April 2020 / Published: 28 April 2020
(This article belongs to the Special Issue Membranes: 10th Anniversary)
Four water insoluble room-temperature protic ionic liquids (PILs) based on the N-alkylimidazolium cation with the alkyl chain length from 1 to 4 and bis(trifluoromethylsulfonyl)imide anion were synthesized and their chemical structure was confirmed by the 1H NMR and 19F NMR analysis. PILs were revealed to be thermally stable up to 360 and 400 °C. At the same time, the proton conductivity of PILs was found to be dependent mostly on the temperature and, to a less extent, on the type of the cation, i.e., the increase of the conductivity from ~3 × 10−4 S/cm at 25 °C to 2 × 10−2 S/cm at 150 °C was observed. The water vapour sorption capacity of PILs was evaluated as a function of relative humidity and the influence of the alkyl chain length on the phase behaviour in the PIL-water system was discussed. The composite polyimide/PILs membranes were prepared by the PIL immobilization in the porous polymer (Matrimid® 5218) film. The composite membranes showed a high level of proton conductivity (~10−3 S/cm) at elevated temperatures (up to 160 °C). The obtained results reveal that the elaborated composite polyimide/PIL membranes are promising candidates for the application as proton exchange membrane at middle and high temperatures. View Full-Text
Keywords: porous polyimide membrane; ionic liquid; conductivity; vapour sorption; thermal stability porous polyimide membrane; ionic liquid; conductivity; vapour sorption; thermal stability
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MDPI and ACS Style

Fatyeyeva, K.; Rogalsky, S.; Makhno, S.; Tarasyuk, O.; Soto Puente, J.A.; Marais, S. Polyimide/Ionic Liquid Composite Membranes for Middle and High Temperature Fuel Cell Application: Water Sorption Behavior and Proton Conductivity. Membranes 2020, 10, 82.

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