Mobility of Li+, Na+, and Cs+ cations in Nafion membrane,as studied by NMR techniques |
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| Institution: | 1. Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation;2. Scientific Center in Chernogolovka, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation;1. A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, Russian Federation;2. National Research University Higher School of Economics (HSE University), 101000 Moscow, Russian Federation;3. G. V. Plekhanov Russian University of Economics, 117997 Moscow, Russian Federation;1. North-Caucasian Zonal Research Veterinary Institute, 346406 Novocherkassk, Russian Federation;2. Institute of Physical and Organic Chemistry, Southern Federal University, 344090 Rostov-on-Don, Russian Federation;3. North-Caucasus Federal University, 355017 Stavropol, Russian Federation;1. Interactive Materials Research – DWI RWTH Aachen University e.V., and Institute for Technical and Macromolecular Chemistry, Forckenbeckstraße 50, D-52074 Aachen, Germany;2. Technical University Cluj-Napoca, Memorandumului 28, R-400114 Cluj-Napoca, Romania;1. A. M. Butlerov Institute of Chemistry, Kazan Federal University, 420008 Kazan, Russian Federation;2. Kazan State Medical University, 420012 Kazan, Russian Federation;1. Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation;2. Department of Fundamental Physical and Chemical Engineering, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation;3. Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation;4. Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation |
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| Abstract: | The local mobility and diffusion of Li+, Na+, and Cs+ cations in Nafion 117 membrane were explored by 7Li, 23Na, and 133Cs spin relaxation and pulsed field gradient NMR techniques. It was shown that the macroscopic mass transfer of cations is controlled by ion motion near sulfonate groups. Lithium and sodium cations, whose hydrated energy is higher than the water hydrogen bond energy, are moving together with water molecules, but cesium cations possessing a low hydrated energy are jumping directly between the neighboring sulfonate groups. |
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| Keywords: | Nafion membrane lithium sodium and cesium cations NMR relaxation times diffusion correlation time |
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