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dc.contributor.author | Volkov V.I. | |
dc.contributor.author | Chernyak A.V. | |
dc.contributor.author | Gnezdilov O.I. | |
dc.contributor.author | Skirda V.D. | |
dc.date.accessioned | 2022-02-09T20:32:57Z | |
dc.date.available | 2022-02-09T20:32:57Z | |
dc.date.issued | 2021 | |
dc.identifier.issn | 0167-2738 | |
dc.identifier.uri | https://dspace.kpfu.ru/xmlui/handle/net/168928 | |
dc.description.abstract | Hydration of Nafion 117 perfluorinated sulfonic cation-exchange membrane in alkaline ion forms was investigated by high resolution 1H NMR. Hydration numbers of Li+, Na+ and Cs+ cations were 5 ± 1, 6 ± 1 and 1 ± 0.2, correspondingly for membrane equilibrated with water vapor at 98% RH. As opposed to Li+ and Na+, which form separate ion pair, Cs+ cation directly contacts with membrane sulfonate group. Cation self-diffusion coefficients were measured by pulsed field gradient NMR technique on 7Li, 23Na and 133Cs nuclei for the first time. Self-diffusion coefficients are changed in the next rows Li+ ≤ Na+ > Cs+. Self-diffusion activation energies of Li+ and Na+ cations are about 20 kJ/mol which is close to water self-diffusion activation energy in these membranes, but Cs+ self-diffusion activation energy is distinctly more (25 kJ/mol). Ionic conductivities calculated on the basis of Nernst–Einstein equation from cation self-diffusion coefficients 1.6∙10−2, 2∙10−2, 6∙10−3 S/cm for Li+, Na+, Cs+ cations, correspondingly, are closely approximating to conductivities measured by impedance spectroscopy: 1.3∙10−2, 1.1∙10−2, 2.3∙10−3 S/cm for Li+, Na+, Cs+ cations, correspondingly, but calculated values are appreciably more compared with experimental meanings. | |
dc.relation.ispartofseries | Solid State Ionics | |
dc.subject | Alkaline metal ions | |
dc.subject | Chemical shift | |
dc.subject | Humidity | |
dc.subject | Hydration number | |
dc.subject | Ion hydration | |
dc.subject | Ionic conductivity | |
dc.subject | Nafion 117 membrane | |
dc.subject | Pulsed field gradient NMR | |
dc.subject | Self-diffusion | |
dc.title | Hydration, self-diffusion and ionic conductivity of Li<sup>+</sup>, Na<sup>+</sup> and Cs<sup>+</sup> cations in Nafion membrane studied by NMR | |
dc.type | Article | |
dc.relation.ispartofseries-volume | 364 | |
dc.collection | Публикации сотрудников КФУ | |
dc.source.id | SCOPUS01672738-2021-364-SID85104293683 |