Proton transport properties in zwitterion blends with brønsted acids

Yoshizawa-Fujita, Masahiro, Byrne, Nolene, Forsyth, Maria, MacFarlane, Douglas R. and Ohno, Hiroyuki 2010, Proton transport properties in zwitterion blends with brønsted acids, Journal of physical chemistry B, vol. 114, no. 49, pp. 16373-16380, doi: 10.1021/jp1078949.

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Title Proton transport properties in zwitterion blends with brønsted acids
Author(s) Yoshizawa-Fujita, Masahiro
Byrne, NoleneORCID iD for Byrne, Nolene
Forsyth, MariaORCID iD for Forsyth, Maria
MacFarlane, Douglas R.
Ohno, Hiroyuki
Journal name Journal of physical chemistry B
Volume number 114
Issue number 49
Start page 16373
End page 16380
Total pages 8
Publisher American chemical society
Place of publication Washington, D.C.
Publication date 2010-11-18
ISSN 1520-6106
Summary We describe zwitterion, 3-(1-butyl-1H-imidazol-3-ium-3-yl)propane-1-sulfonate (Bimps), mixtures with 1,1,1-trifluoro-N-(trifluoromethylsulfonyl)methanesulfoneamide (HN(Tf)2) as new proton transport electrolytes. We report proton transport mechanisms in the mixtures based on results from several methods including thermal analyses, the complex-impedance method, and the pulsed field gradient spin echo NMR (pfg-NMR) method. The glass transition temperature (Tg) of the mixtures decreased with increasing HN(Tf)2 concentration up to 50 mol %. The Tg remained constant at −55 °C with further acid doping. The ionic conductivity of HN(Tf)2 mixtures increased with the HN(Tf)2 content up to 50 mol %. Beyond that ratio, the mixtures showed no increase in ionic conductivity (10−4 S cm−1 at room temperature). This tendency agrees well with that of Tg. However, the self-diffusion coefficients obtained from the pfg-NMR method increased with HN(Tf)2 content even above 50 mol % for all component ions. At HN(Tf)2 50 mol %, the proton diffusion of HN(Tf)2 was the fastest in the mixture. These results suggest that Bimps cannot dissociate excess HN(Tf)2, that is, the excess HN(Tf)2 exists as molecular HN(Tf)2 in the mixtures. The zwitterion, Bimps, forms a 1:1 complex with HN(Tf)2 and the proton transport property in this mixture is superior to those of other mixing ratios. Furthermore, CH3SO3H and CF3SO3H were mixed with Bimps for comparison. Both systems showed a similar tendency, which differed from that of the HN(Tf)2 system. The Tg decreased linearly with increasing acid content for every mixing ratio, while the ionic conductivity increased linearly. Proton transport properties in zwitterion/acid mixtures were strongly affected by the acid species added.
Language eng
DOI 10.1021/jp1078949
Field of Research 091205 Functional Materials
030304 Physical Chemistry of Materials
Socio Economic Objective 850401 Fuel Cells (excl. Solid Oxide)
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2010, American Chemical Society
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Document type: Journal Article
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