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@ARTICLE{Wippermann:843751,
      author       = {Wippermann, Klaus and Giffin, Jürgen and Korte, Carsten},
      title        = {{I}n {S}itu {D}etermination of the {W}ater {C}ontent of
                      {I}onic {L}iquids},
      journal      = {Journal of the Electrochemical Society},
      volume       = {165},
      number       = {5},
      issn         = {0013-4651},
      address      = {Pennington, NJ},
      publisher    = {Electrochemical Soc.},
      reportid     = {FZJ-2018-01303},
      pages        = {H263 - H270},
      year         = {2018},
      abstract     = {This study examines the applicability of electrochemical
                      methods to the in situ determination of the water content in
                      proton-conducting ionic liquids (PILs). Two
                      proton-conducting ionic liquids with different acidities and
                      hygroscopicities of the cations, sulfoethylmethylammonium
                      trifluoromethanesulfonate, [2-Sema][TfO] and
                      N,N-diethylmethylammonium trifluoromethanesulfonate,
                      [Dema][TfO], were used. At first, PIL water electrolytes
                      with known water concentrations ([2-Sema][TfO]: 0.64-6.1
                      $wt\%,$ [Dema][TfO]: 0.18-99.5 $wt\%)$ were prepared. Then,
                      the influence of the water content on the electrochemical
                      properties, namely the electrical conductivity, charge of
                      hydrogen oxidation, charge of Pt oxide reduction and onset
                      potential of Pt oxidation, were investigated. The four
                      parameters were plotted as a function of the water
                      concentration and fitted by exponential, linear or
                      asymptotic functions. These fits serve as calibration curves
                      that can be used to determine the actual water concentration
                      by measuring one or more of the four parameters
                      investigated. It was found that the measurement of specific
                      ion conductivity is a fast and simple method across a wide
                      range of water concentrations. The evaluation of the Pt
                      oxide reduction charge from cyclic voltammograms is more
                      time-consuming, but provides higher accuracy at low water
                      concentrations, although the accuracy also depends on the
                      nature of the ionic liquid.},
      cin          = {IEK-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-3-20101013},
      pnm          = {135 - Fuel Cells (POF3-135)},
      pid          = {G:(DE-HGF)POF3-135},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000431803900133},
      doi          = {10.1149/2.0991805jes},
      url          = {https://juser.fz-juelich.de/record/843751},
}