Revealing the Charge Transport Mechanism in Polymerized Ionic Liquids: Insight from High Pressure Conductivity Studies

Zaneta Wojnarowska, Hongbo Feng, Mariana Diaz, Alfredo Ortiz, Inmaculada Ortiz, Justyna Knapik-Kowalczuk, Miguel Vilas, Pedro Verdía, Emilia Tojo, Tomonori Saito, Eric W. Stacy, Nam Goo Kang, Jimmy W. Mays, Danuta Kruk, Patryk Wlodarczyk, Alexei P. Sokolov, Vera Bocharova, Marian Paluch

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Polymerized ionic liquids (polyILs), composed mostly of organic ions covalently bonded to the polymer backbone and free counterions, are considered as ideal electrolytes for various electrochemical devices, including fuel cells, supercapacitors, and batteries. Despite large structural diversity of these systems, all of them reveal a universal but poorly understood feature: a charge transport faster than the segmental dynamics. To address this issue, we studied three novel polymer electrolyte membranes for fuel cells as well as four single-ion conductors, including highly conductive siloxane-based polyIL. Our ambient and high pressure studies revealed fundamental differences in the conducting properties of the examined systems. We demonstrate that the proposed methodology is a powerful tool to identify the charge transport mechanism in polyILs in general and thereby contribute to unraveling the microscopic nature of the decoupling phenomenon in these materials.

Original languageEnglish
Pages (from-to)8082-8092
Number of pages11
JournalChemistry of Materials
Volume29
Issue number19
DOIs
StatePublished - Oct 10 2017

Funding

Z.W., J.K-K. and M.P. are deeply grateful for the financial support by the National Science Centre within the framework of the Opus8 project (Grant DEC-2014/15/B/ST3/04246). This work was supported by Laboratory Directed Research and Development program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy. J.W.M. and A.P.S. acknowledge partial financial support for help with synthesis and data analysis/interpretation by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences, and Engineering Division. E.T. is grateful to the Xunta de Galicia (REGALIs Network R2014/ 015) for their financial support as well as the research support services of the University of Vigo (CACTI) for the NMxR and MS divisions work. M.D., A.O., and I.O. acknowledge the Spanish Ministry of Economy and Competitiveness for Project CTQ2015-66078-R (MINECO/FEDER, UE) and the Project “PEMFC-SUDOE”-SOE1/P1/E0293 which is co-financed by the FEDER in the framework of the “Interreg Sudoe programme”. M.D. is grateful to the Spanish Ministry of Education, Culture and Sport for Project FPU2012-3721.

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