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@ARTICLE{Kulikovsky:892744,
      author       = {Kulikovsky, Andrei},
      title        = {{I}mpedance and {R}esistivity of {L}ow–{P}t {C}athode in
                      a {PEM} {F}uel {C}ell},
      journal      = {Journal of the Electrochemical Society},
      volume       = {168},
      number       = {4},
      issn         = {1945-7111},
      address      = {Bristol},
      publisher    = {IOP Publishing},
      reportid     = {FZJ-2021-02302},
      pages        = {044512 -},
      year         = {2021},
      abstract     = {Analysis of impedance model for the low–Pt cathode
                      catalyst layer (CCL) in a PEM fuel cell is reported. The CCL
                      is modeled as a cylindrical pore with the Nafion film
                      separating the open pore volume from the Pt/C surface. In
                      the limit of fast oxygen transport through the open pore,
                      analytical expressions for the CCL impedance, Nafion film
                      impedance and for the ohmic CCL resistivity Rccl (Ohm cm2)
                      are derived. The characteristic frequency of film impedance
                      is independent of film oxygen transport parameters and it is
                      only 1.73 times less than the frequency of faradaic process
                      in the CCL, which impedes separation of these processes by
                      impedance spectroscopy. A fast version of algorithm for
                      distrubution of relaxation times calculation is developed
                      and used to illustrate the problem. Rccl exhibits rapid
                      growth in the vicinity of limiting current density in the
                      Nafion film, manifesting "overlinear" oxygen transport loss
                      reported in experiments. For typical low–Pt cell
                      parameters, this growth occurs at the cell current around 1
                      A cm−2. The model leads to a simple relation for the
                      Nafion film transport resistivity ${{ \mathcal R }}_{N}$ (s
                      cm−1); this relation is compared to semi–empirical and
                      model relations available in literature.},
      cin          = {IEK-13},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-13-20190226},
      pnm          = {123 - Chemische Energieträger (POF4-123)},
      pid          = {G:(DE-HGF)POF4-123},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000640599300001},
      doi          = {10.1149/1945-7111/abf508},
      url          = {https://juser.fz-juelich.de/record/892744},
}