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@ARTICLE{Beermann:825373,
      author       = {Beermann, Vera and Gocyla, Martin and Willinger, Elena and
                      Rudi, Stefan and Heggen, Marc and Willinger, Marc and Peter,
                      Strasser.},
      title        = {{R}h doped {P}t-{N}i octahedral nanoparticles:
                      {C}orrelation between elemental {D}istribution and {ORR}
                      stabilty},
      journal      = {Nano letters},
      volume       = {16},
      number       = {3},
      issn         = {1530-6984},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2016-07836},
      pages        = {1719 - 1725},
      year         = {2016},
      abstract     = {Thanks to their remarkably high activity toward oxygen
                      reduction reaction (ORR), platinum-based octahedrally shaped
                      nanoparticles have attracted ever increasing attention in
                      last years. Although high activities for ORR catalysts have
                      been attained, the practical use is still limited by their
                      long-term stability. In this work, we present Rh-doped
                      Pt–Ni octahedral nanoparticles with high activities up to
                      1.14 A mgPt–1 combined with improved performance and shape
                      stability compared to previous bimetallic Pt–Ni octahedral
                      particles. The synthesis, the electrocatalytic performance
                      of the particles toward ORR, and atomic degradation
                      mechanisms are investigated with a major focus on a deeper
                      understanding of strategies to stabilize morphological
                      particle shape and consequently their performance. Rh
                      surface-doped octahedral Pt–Ni particles were prepared at
                      various Rh levels. At and above about 3 atom $\%,$ the
                      nanoparticles maintained their octahedral shape even past
                      30 000 potential cycles, while undoped bimetallic
                      reference nanoparticles show a complete loss in octahedral
                      shape already after 8000 cycles in the same potential
                      window. Detailed atomic insight in these observations is
                      obtained from aberration-corrected scanning transmission
                      electron microscopy (STEM) and energy dispersive X-ray (EDX)
                      analysis. Our analysis shows that it is the migration of Pt
                      surface atoms and not, as commonly thought, the dissolution
                      of Ni that constitutes the primary origin of the octahedral
                      shape loss for Pt–Ni nanoparticles. Using small amounts of
                      Rh we were able to suppress the migration rate of platinum
                      atoms and consequently suppress the octahedral shape loss of
                      Pt–Ni nanoparticles.},
      cin          = {PGI-5},
      ddc          = {540},
      cid          = {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:000371946300031},
      doi          = {10.1021/acs.nanolett.5b04636},
      url          = {https://juser.fz-juelich.de/record/825373},
}