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@ARTICLE{Gan:280451,
      author       = {Gan, Lin and Heggen, Marc and Cui, Chunhua and Strasser,
                      Peter},
      title        = {{T}hermal {F}acet {H}ealing of {C}oncave {O}ctahedral
                      {P}t–{N}i {N}anoparticles {I}maged in {S}itu at the
                      {A}tomic {S}cale: {I}mplications for the {R}ational
                      {S}ynthesis of {D}urable {H}igh-{P}erformance {ORR}
                      {E}lectrocatalysts},
      journal      = {ACS catalysis},
      volume       = {6},
      issn         = {2155-5435},
      address      = {Washington, DC},
      publisher    = {ACS},
      reportid     = {FZJ-2016-00225},
      pages        = {692 - 695},
      year         = {2015},
      abstract     = {We performed in situ transmission electron microscopy of
                      phase-segregated octahedral Pt–Ni alloy fuel cell
                      nanocatalysts under thermal annealing to study their
                      morphological stability and surface compositional evolution.
                      The pristine octahedral Pt–Ni nanoparticles (NPs) showed
                      Pt-rich corners/edges and slightly concave Ni-rich {111}
                      facets. Time-resolved image series unequivocally revealed
                      that upon annealing up to 500 °C, the Pt-rich surface atoms
                      at the corners/edges diffused onto and subsequently covered
                      the concave Ni-rich {111} surfaces, leading to perfectly
                      flat Pt-rich {111} surfaces with Ni-rich subsurface layers.
                      This was further corroborated by in situ
                      aberration-corrected scanning transmission electron
                      microscopy and electron energy loss spectroscopy. Our
                      results propose a feasible approach to construct shaped Pt
                      alloy nanoparticles with Pt-rich {111} surfaces and Ni-rich
                      subsurface layers that are expected to be catalytically
                      active and stable for the oxygen reduction reaction, thus
                      providing important implications for rational synthesis of
                      durably highly active shaped Pt alloy fuel cell
                      electrocatalysts.},
      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:000369774900025},
      doi          = {10.1021/acscatal.5b02620},
      url          = {https://juser.fz-juelich.de/record/280451},
}