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@ARTICLE{Lin:866786,
      author       = {Lin, Jingjing and Wang, Liming and Zinkevich, Tatiana and
                      Indris, Sylvio and Suo, Yanpeng and Korte, Carsten},
      title        = {{I}nfluence of {R}esidual {W}ater and {C}ation {A}cidity on
                      the {I}onic {T}ransport {M}echanism in {P}roton-{C}onducting
                      {I}onic {L}iquids},
      journal      = {Physical chemistry, chemical physics},
      volume       = {22},
      number       = {3},
      issn         = {1463-9076},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2019-05852},
      pages        = {1145-1153},
      year         = {2020},
      abstract     = {Proton-conducting ionic liquids (PILs) are discussed herein
                      as potential new electrolytes for polymer membrane fuel
                      cells, suitable for operation temperatures above 100 °C.
                      During fuel cell operation, the presence of significant
                      amounts of residual water is unavoidable, even at these
                      elevated temperatures. By using electrochemical and NMR
                      methods, the impact of residual water on
                      2-sulfoethylmethylammonium triflate [2-Sema][TfO],
                      1-ethylimidazolium triflate [1-EIm][TfO] and
                      diethylmethylammonium triflate [Dema][TfO] is analyzed. The
                      cationic acidity of these PILs varies by over ten orders of
                      magnitude. Appropriate amounts of the PIL and H2O were mixed
                      at various molar ratios to obtain compositions, varying from
                      the neat PIL to H2O-excess conditions. The conductivity of
                      [2-Sema][TfO] exponentially increases depending on the H2O
                      concentration. The results from 1H-NMR spectroscopy and
                      self-diffusion coefficient measurements by 1H field-gradient
                      NMR indicate a fast proton exchange process between
                      [2-Sema]+ and H2O. Conversely, [1-EIm][TfO] and [Dema][TfO]
                      show only very slow or non-significant proton exchange,
                      respectively, with H2O during the time-scale relevant for
                      transport. The proton conduction follows a combination of
                      vehicle and cooperative mechanisms in highly acidic PIL,
                      while a mostly vehicle mechanism in medium and low acidic
                      PIL occurs. Therefore, highly acidic ionic liquids are
                      promising new candidates for polymer electrolyte fuel cells
                      at an elevated temperature.},
      cin          = {IEK-14},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-14-20191129},
      pnm          = {135 - Fuel Cells (POF3-135)},
      pid          = {G:(DE-HGF)POF3-135},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31774423},
      UT           = {WOS:000509371400020},
      doi          = {10.1039/C9CP04723A},
      url          = {https://juser.fz-juelich.de/record/866786},
}