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@ARTICLE{Wippermann:889820,
      author       = {Wippermann, Klaus and Suo, Yanpeng and Korte, Carsten},
      title        = {{O}xygen reduction reaction kinetics on {P}t in mixtures of
                      proton conducting ionic liquids ({PIL}s) and water: {T}he
                      influence of cation acidity},
      journal      = {The journal of physical chemistry / C},
      volume       = {125},
      number       = {8},
      issn         = {1932-7447},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2021-00433},
      pages        = {4423 - 4435},
      year         = {2021},
      abstract     = {The aim of this study is to investigate the effect of the
                      acidity of proton-conducting ionic liquids (PILs) on the
                      oxygen reduction reaction (ORR) kinetics at polycrystalline
                      platinum electrodes. Three PILs ([2-SEMA][TfO],
                      [1-EIm][TfO], and [DEMA][TfO]) with different cation
                      acidities (aqueous pKa = 0.94, 7.30 and 10.55) are
                      investigated. The ORR kinetics are evaluated by simulating
                      cyclic voltammograms recorded under an oxygen atmosphere. An
                      associative mechanism, including H3O+ as the dominant proton
                      donor, is used for the simulations. The dependencies of the
                      rate constants k1 and the charge transfer coefficients α1
                      of the r.d.s. (O2 + e– → O2–) on the cation acidity,
                      the water content (≈3–50 mol $\%),$ and the temperature
                      (30–90 °C) are analyzed. The rate constant k1, the
                      pre-exponential factor of k1, and the current density are
                      observed to increase with the acidity of the PIL cation,
                      whereas α1 shows the opposite behavior. At low water
                      concentrations, the [2-SEMA+] cation is a remarkably good
                      proton donor in ORR, contrary to the former results obtained
                      from the HUPD reaction. This leads to a minimum of ≈30 mol
                      $\%$ in the plots of the current density and k1 vs the water
                      content, which correlates with a similar dependency of the
                      pseudo capacitance C2.},
      cin          = {IEK-14},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-14-20191129},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1231},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000626769100012},
      doi          = {10.1021/acs.jpcc.0c11374},
      url          = {https://juser.fz-juelich.de/record/889820},
}