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@ARTICLE{Appel:866594,
      author       = {Appel, Marina and Borisov, Galin and Holderer, Olaf and
                      Appavou, Marie-Sousai and Zorn, Reiner and Lehnert, Werner
                      and Richter, Dieter},
      title        = {{P}roton diffusion in the catalytic layer for high
                      temperature polymer electrolyte fuel cells},
      journal      = {RSC Advances},
      volume       = {9},
      number       = {6},
      issn         = {2046-2069},
      address      = {London},
      publisher    = {RSC Publishing},
      reportid     = {FZJ-2019-05675},
      pages        = {37768},
      year         = {2019},
      abstract     = {The present study focuses on quasielastic neutron
                      scattering (QENS) of the proton dynamics in phosphoric acid
                      (PA) inside the catalytic layer of high-temperature polymer
                      electrolyte fuel cells (HT-PEFCs). The nanosecond proton
                      dynamics is investigated on the local length scale around
                      operating temperatures (300 K–430 K) using neutron
                      backscattering spectroscopy. We have investigated the
                      catalyst doped with different amounts of PA in order to
                      understand the distribution of PA inside the layer. Three
                      approaches are considered for the description of proton
                      dynamics: the random jump diffusion model, distribution of
                      diffusion constants and, finally, the trap model. Due to
                      adsorption of the PA on the Pt particles the diffusion of
                      protons in the catalytic layer is different in comparison to
                      the bulk acid. The proton dynamics in the catalytic layer
                      can be described by the random jump diffusion with traps.
                      This diffusion is significantly slower than the diffusion of
                      free PA; this also results in a lower conductivity, which is
                      estimated from the obtained diffusion constant.},
      cin          = {JCNS-FRM-II / IEK-3 / JCNS-1 / JCNS-2 / MLZ},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)IEK-3-20101013 / I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 135 - Fuel Cells
                      (POF3-135) / 6215 - Soft Matter, Health and Life Sciences
                      (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-135 /
                      G:(DE-HGF)POF3-6215},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101 /
                      EXP:(DE-MLZ)TEM-MLZ-20151210},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000501604800010},
      doi          = {10.1039/c9ra06431a},
      url          = {https://juser.fz-juelich.de/record/866594},
}