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@ARTICLE{Wippermann:829107,
      author       = {Wippermann, Klaus and Giffin, Jürgen and Kuhri, Susanne
                      and Lehnert, Werner and Korte, Carsten},
      title        = {{I}nfluence of water content in a proton-conducting ionic
                      liquid on the double layer properties of the {P}t/{PIL}
                      interface},
      journal      = {Physical chemistry, chemical physics},
      volume       = {19},
      number       = {36},
      issn         = {1463-9076},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2017-02917},
      pages        = {24706 - 24723},
      year         = {2017},
      abstract     = {The influence of the water content of
                      2-sulfoethylmethylammonium trifluoromethanesulfonate
                      [2-Sema][TfO] on the double layer properties of the
                      interface of platinum and the proton conducting ionic liquid
                      (PIL) is investigated by means of impedance spectroscopy and
                      cyclic voltammetry. By fitting the impedance spectra as
                      complex capacitances, up to four differential double layer
                      capacitances and corresponding time constants are obtained,
                      depending on the potential (U = 0–1.6 V/RHE), water
                      content (0.7–6.1 $wt\%)$ and temperature (T = 70–110
                      °C). Within the whole potential range investigated, a high
                      frequency capacitance, C1, and a low frequency capacitance,
                      C2, can be calculated. In the potential region of hydrogen
                      underpotential deposition (HUPD), C1 can be separated into
                      two parts, C1a and C1b. Whereas the high frequency
                      capacitive processes can mainly be attributed to ion
                      transport processes in the double layer, the low frequency
                      process is ascribed to changes in the interfacial layer,
                      including ad-/desorption and Faradaic processes. Alternative
                      interpretations regarding the reorientation of ions,
                      reconstruction of the metal surface and partial electron
                      transfer between anions and Pt are considered.},
      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},
      pubmed       = {pmid:28861561},
      UT           = {WOS:000411606200034},
      doi          = {10.1039/C7CP04003B},
      url          = {https://juser.fz-juelich.de/record/829107},
}