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Probing ion exchange in the triflic acid-guanidinium triflate system: a solid-state nuclear magnetic resonance study

Zhu, Haijin, MacFarlane, Douglas and Forsyth, Maria 2014, Probing ion exchange in the triflic acid-guanidinium triflate system: a solid-state nuclear magnetic resonance study, Journal of Physical Chemistry C, vol. 118, no. 49, pp. 28520-28526, doi: 10.1021/jp5101472.

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Title Probing ion exchange in the triflic acid-guanidinium triflate system: a solid-state nuclear magnetic resonance study
Author(s) Zhu, HaijinORCID iD for Zhu, Haijin orcid.org/0000-0001-6352-7633
MacFarlane, Douglas
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Journal name Journal of Physical Chemistry C
Volume number 118
Issue number 49
Start page 28520
End page 28526
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2014-12-11
ISSN 1932-7447
1932-7455
Summary Knowledge 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.
Language eng
DOI 10.1021/jp5101472
Field of Research 030304 Physical Chemistry of Materials
Socio Economic Objective 850401 Fuel Cells (excl. Solid Oxide)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID FL110100013
LE110100141
Copyright notice ©2014, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30070195

Document type: Journal Article
Collection: Institute for Frontier Materials
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