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@ARTICLE{Gocyla:858797,
      author       = {Gocyla, Martin and Kuehl, Stefanie and Shviro, Meital and
                      Heyen, Henner and Selve, Soeren and Dunin-Borkowski, Rafal
                      and Heggen, Marc and Strasser, Peter},
      title        = {{S}hape {S}tability of {O}ctahedral {P}t{N}i
                      {N}anocatalysts for {E}lectrochemical {O}xygen {R}eduction
                      {R}eaction {S}tudied by in situ {T}ransmission {E}lectron
                      {M}icroscopy},
      journal      = {ACS nano},
      volume       = {12},
      number       = {6},
      issn         = {1936-086X},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2018-07637},
      pages        = {5306 - 5311},
      year         = {2018},
      abstract     = {Octahedral faceted nanoparticles are highly attractive fuel
                      cell catalysts as a result of their activity for the oxygen
                      reduction reaction (ORR). However, their surface
                      compositional and morphological stability currently limits
                      their long-term performance in real membrane electrode
                      assemblies. Here, we perform in situ heating of
                      compositionally segregated PtNi1.5 octahedral nanoparticles
                      inside a transmission electron microscope, in order to study
                      their compositional and morphological changes. The starting
                      PtNi1.5 octahedra have Pt-rich edges and concave Ni-rich
                      {111} facets. We reveal a morphological evolution sequence,
                      which involves transformation from concave octahedra to
                      particles with atomically flat {100} and {111} facets,
                      ideally representing truncated octahedra or cuboctahedra.
                      The flat {100} and {111} facets are thought to comprise a
                      thin Pt layer with a Ni-rich subsurface, which may boost
                      catalytic activity. However, the transformation to truncated
                      octahedra/cuboctahedra also decreases the area of the highly
                      active {111} facets. The morphological and surface
                      compositional evolution, therefore, results in a compromise
                      between catalytic activity and morphological stability. Our
                      findings are important for the design of more stable faceted
                      PtNi nanoparticles with high activities for the ORR.},
      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},
      pubmed       = {pmid:29799722},
      UT           = {WOS:000436910200025},
      doi          = {10.1021/acsnano.7b09202},
      url          = {https://juser.fz-juelich.de/record/858797},
}