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@INPROCEEDINGS{Chen:875378,
      author       = {Chen, Yingzhen and Rodenbücher, Christian and Giffin,
                      Jürgen and Wippermann, Klaus and Korte, Carsten},
      title        = {{I}nterfaces between {C}atalytic {E}lectrodes and {P}rotic
                      {I}onic {L}iquids for the {I}ntermediate-{T}emperature
                      {P}olymer {E}lectrolyte {F}uel {C}ell},
      reportid     = {FZJ-2020-01989},
      year         = {2020},
      abstract     = {Interfaces between catalytic electrodes and protic ionic
                      liquids for the intermediate-temperature polymer electrolyte
                      fuel cellsY. Chen, Jülich/DE, C. Rodenbücher, Jülich/DE,
                      J. Giffin, Jülich/DE, K. Wippermann, Jülich/DE, C. Korte,
                      Jülich/DEForschungszentrum Jülich GmbH, Institute of
                      Energy and Climate Research (IEK-14), 52425 Jülich,
                      GermanyWith the environmental concerns and energy issues,
                      the demand for clean and sustain-able energy sources has
                      become one of the most challenging topics in the current
                      cen-tury. Fuel cells have stimulated particular interest,
                      because they can generate electricity with high efficiency
                      using “green hydrogen”. In recent years, polymer
                      electrolyte mem-brane fuel cells (PEMFC) have turned out to
                      be the most viable alternative to combus-tion engines for
                      automotive applications. However, PEMFC with sulfonated
                      fluoropoly-mers, e.g. NAFION®, whose proton conduction
                      relies on the presence of water, limits the operating
                      temperature below 80 °C (ambient pressure). A PEMFC
                      operating at 100–120 °C would be more attractive, owing
                      to a much more simplified system setup for water and heat
                      management. This requires a novel non-aqueous electrolyte.In
                      this study we investigate proton conducting ionic liquids
                      (PIL) as alternative proton-conducting electrolytes for
                      intermediate-temperature PEMFCs. Ionic liquids consist
                      basically of bulky organic cations and anions of superacids.
                      Due to the low lattice energy they are liquids at room
                      temperature. A large variety of combination of cation and
                      anion gives the opportunity to design ionic liquids with
                      desired properties. The structure of the electrical double
                      layer close to the electrode/electrolyte interface is
                      completely different compared to classical aqueous solutions
                      as there are alternating layers of cations and anions.
                      Preceding investigations on PILs with cations of different
                      Brønsted-acidity give rise to the assumption that the
                      proton transfer from the cation to the active centres on the
                      electrode surface is mainly determining the rate of the ORR.
                      [1] As residual water is unavoidable during fuel cell
                      operation even above 100 °C, its concentration and the
                      acidity of the PIL will play an important role.In order to
                      understand the electrochemical kinetics at the
                      electrode-electrolyte inter-face, spectroelectrochemical
                      analyses were carried out by combining cyclovoltammetry and
                      impedance spectroscopy with FT-IR spectroscopy and atomic
                      force microscopy (AFM). First results show that the
                      structure of the electrical double layer and the ionic
                      transport depend on the applied cell potential, the content
                      of water and the temperature. The observed formation of a
                      dense layered structure at the interface can be related to
                      the interplay of Coulomb interaction between the ions and
                      steric effects. The findings provide a better understanding
                      of the electrochemical kinetics of protic ionic liquids at
                      the catalytic surface and give valuable guidance for design
                      and further optimization of ionic liquids for
                      intermediate-temperature PEMFC fuel cells.[1] K. Wippermann,
                      J. Wackerl, W. Lehnert, B. Huber and C. Korte, J.
                      Electrochem. Soc., 2016, 163, F25.},
      month         = {Sep},
      date          = {2020-09-23},
      organization  = {Electrochemistry 2020, Berlin
                       (Germany), 23 Sep 2020 - 25 Sep 2020},
      cin          = {IEK-14},
      cid          = {I:(DE-Juel1)IEK-14-20191129},
      pnm          = {135 - Fuel Cells (POF3-135)},
      pid          = {G:(DE-HGF)POF3-135},
      typ          = {PUB:(DE-HGF)1},
      url          = {https://juser.fz-juelich.de/record/875378},
}