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@ARTICLE{Schmies:842559,
      author       = {Schmies, Henrike and Bergmann, Arno and Drnec, Jakub and
                      Wang, Guanxiong and Teschner, Detre and Kühl, Stefanie and
                      Sandbeck, Daniel J. S. and Cherevko, Serhiy and Gocyla,
                      Martin and Shviro, Meital and Heggen, Marc and Ramani, Vijay
                      and Dunin-Borkowski, Rafal and Mayrhofer, Karl J. J. and
                      Strasser, Peter},
      title        = {{U}nravelling {D}egradation {P}athways of
                      {O}xide-{S}upported {P}t {F}uel {C}ell {N}anocatalysts under
                      {I}n {S}itu {O}perating {C}onditions},
      journal      = {Advanced energy materials},
      volume       = {8},
      number       = {4},
      issn         = {1614-6832},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2018-00778},
      pages        = {1701663},
      year         = {2018},
      abstract     = {Knowledge of degradation pathways of catalyst/support
                      ensembles aids the development of rational strategies to
                      improve their stability. Here, this is exemplified using
                      indium tin oxide (ITO)-supported Platinum nanoparticles as
                      electrocatalysts at fuel cell (FC) cathodes under
                      degradation protocols to mimic operating conditions in two
                      potential regimes. The evolution of crystal structure,
                      composition, crystallite and particle size is tracked by in
                      situ X-ray techniques (small and wide angle scattering),
                      metal dissolution by in situ scanning flow cell coupled with
                      mass spectrometry (SFC ICP-MS) and Pt surface morphology by
                      advanced electron microscopy. In a regular FC operation
                      regime, Pt poisoning rather than Pt particle growth,
                      agglomeration, dissolution or detachment was found to be the
                      likely origin of the observed degradation and ORR activity
                      losses. In the start-up regime degradation is actually
                      suppressed and only minor losses in catalytic activity are
                      observed. The presented data thus highlight the excellent
                      nanoparticle stabilization and corrosion resistance of the
                      ITO support, yet point to a degradation pathway involving Pt
                      surface modifications by deposition of sub-monolayers of
                      support metal ions. The identified degradation pathway of
                      the Pt/oxide catalyst/support couple contributes to our
                      understanding of cathode electrocatalysts for polymer
                      electrolyte fuel cells (PEFC).},
      cin          = {ER-C-1 / PGI-5},
      ddc          = {600},
      cid          = {I:(DE-Juel1)ER-C-1-20170209 / I:(DE-Juel1)PGI-5-20110106},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000424152200011},
      doi          = {10.1002/aenm.201701663},
      url          = {https://juser.fz-juelich.de/record/842559},
}