Ion transport and softening in a polymerized ionic liquid

Kumar, Rajeev; Bocharova, Vera; Strelcov, Evgheni; Tselev, Alexander; Kravchenko, Ivan I.; Berdzinski, Stefan; Strehmel, Veronika; Ovchinnikova, Olga S.; Minutolo, Joseph A.; Sangoro, Joshua R.; Agapov, Alexander L.; Sokolov, Alexei P.; Kalinin, Sergei V.; Sumpter, Bobby G.

doi:10.1039/C4NR05491A

Title: Ion transport and softening in a polymerized ionic liquid

Journal Article · Thu Nov 13 00:00:00 EST 2014 · Nanoscale

DOI:https://doi.org/10.1039/C4NR05491A· OSTI ID:1286714

Kumar, Rajeev ^[1]; Bocharova, Vera ^[2]; Strelcov, Evgheni ^[3]; Tselev, Alexander ^[3]; Kravchenko, Ivan I. ^[3]; Berdzinski, Stefan ^[4]; Strehmel, Veronika ^[4]; Ovchinnikova, Olga S. ^[2]; Minutolo, Joseph A. ^[5]; Sangoro, Joshua R. ^[5]; Agapov, Alexander L. ^[6]; Sokolov, Alexei P. ^[7]; Kalinin, Sergei V. ^[3]; Sumpter, Bobby G. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
Hochschule Niederrhein Univ. of Applied Sciences, Krefeld (Germany). Dept. of Chemistry. Inst. for Coatings and Surface Chemistry
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemical and Biomolecular Engineering
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry

Polymerized ionic liquids (PolyILs) are promising materials for various solid state electronic applications such as dye-sensitized solar cells, lithium batteries, actuators, field-effect transistors, light emitting electrochemical cells, and electrochromic devices. However, fundamental understanding of interconnection between ionic transport and mechanical properties in PolyILs is far from complete. In this paper, local charge transport and structural changes in films of a PolyIL are studied using an integrated experiment-theory based approach. Experimental data for the kinetics of charging and steady state current–voltage relations can be explained by taking into account the dissociation of ions under an applied electric field (known as the Wien effect). Onsager's theory of the Wien effect coupled with the Poisson–Nernst–Planck formalism for the charge transport is found to be in excellent agreement with the experimental results. The agreement between the theory and experiments allows us to predict structural properties of the PolyIL films. We have observed significant softening of the PolyIL films beyond certain threshold voltages and formation of holes under a scanning probe microscopy (SPM) tip, through which an electric field was applied. Finally, the observed softening is explained by the theory of depression in glass transition temperature resulting from enhanced dissociation of ions with an increase in applied electric field.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1286714

Journal Information:: Nanoscale, Vol. 7, Issue 3; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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