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Enhancing solid-state conductivity through acid or base doping of protic imidazolium and imidazolinium triflate salts
journal contribution
posted on 2017-12-21, 00:00 authored by A L Chong, Haijin Zhu, K M Nairn, Maria ForsythMaria Forsyth, D R MacfarlaneProtic salts, including those showing plastic crystal behavior, are an interesting family of materials being rediscovered for use as solid conducting materials. This work compares two such compounds, 2-methylimidazolium triflate, [2-MeHIm][TfO], and 2-methylimidazolinium triflate, [2-MeHImn][TfO]. This subtle change in structure resulted in substantial differences in thermal behavior; [2-MeHIm][TfO] shows two solid-solid phase transitions while none were observed for [2-MeHImn][TfO]. However, both compounds are in a disordered solid state (ΔSf< 40 JK-1mol-1) resulting in relatively high room temperature conductivities. Neat [2-MeHImn][TfO] had a conductivity above 10-5S cm-1, but the addition of either the component acid or base as dopants resulted in a substantial increase in conductivity, to over 10-4S cm-1at 30 °C. Solid-state1H and19F NMR studies suggest that the dopants enhance the conduction primarily by increasing the proportion of mobile ions in the solid matrix. However, [2-MeHIm][TfO] also displays evidence of proton hopping via the cation.
History
Journal
Journal of physical chemistry CVolume
121Issue
50Pagination
27849 - 27859Publisher
American Chemical SocietyLocation
Washington, D.C.Publisher DOI
ISSN
1932-7447eISSN
1932-7455Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2017, American Chemical SocietyUsage metrics
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No categories selectedKeywords
protic saltsplastic crystal behaviorsolid conducting materials2-methylimidazolium triflate[2-MeHIm][TfO]Science & TechnologyPhysical SciencesTechnologyChemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryChemistryScience & Technology - Other TopicsMaterials ScienceFUEL-CELL APPLICATIONSPLASTIC CRYSTALIONIC LIQUIDSEXCHANGE MEMBRANESTRANSPORTCONDUCTORSPHASENMRELECTROLYTESANION
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