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Probing ion exchange in the triflic acid-guanidinium triflate system: A solid-state nuclear magnetic resonance study
journal contribution
posted on 2014-12-11, 00:00 authored by Haijin Zhu, D Macfarlane, Maria ForsythMaria ForsythKnowledge of ion exchange and transport behavior in electrolyte materials is crucial for designing and developing novel electrolytes for electrochemical device applications such as fuel cells or batteries. In the present study, we show that, upon the addition of triflic acid (HTf) to the guanidinium triflate (GTf) solid-state matrix, several orders of magnitude enhancement in the proton conductivity can be achieved. The static 1H and 19F solid-state NMR results show that the addition of HTf has no apparent effect on local molecular mobility of the GTf matrix at room temperature. At higher temperatures, however, the HTf exhibits fast ion exchange with the GTf matrix. The exchange rate, as quantified by our continuum T2 fitting analysis, increases with increasing temperature. The activation energy for the chemical exchange process was estimated to be 58.4 kJ/mol. It is anticipated that the solid-state NMR techniques used in this study may be also applied to other organic solid-state electrolyte systems to investigate their ion-exchange processes.
History
Journal
Journal of Physical Chemistry CVolume
118Issue
49Pagination
28520 - 28526Publisher
American Chemical SocietyLocation
Washington, D.C.Publisher DOI
ISSN
1932-7447eISSN
1932-7455Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2014, American Chemical SocietyUsage metrics
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