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@ARTICLE{Cui:201604,
      author       = {Cui, Chunhua and Gan, Lin and Heggen, Marc and Rudi, Stefan
                      and Strasser, Peter},
      title        = {{C}ompositional segregation in shaped {P}t alloy
                      nanoparticles and their structural behaviour during
                      electrocatalysis},
      journal      = {Nature materials},
      volume       = {12},
      number       = {8},
      issn         = {1476-4660},
      address      = {Basingstoke},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2015-03898},
      pages        = {765 - 771},
      year         = {2013},
      abstract     = {Shape-selective monometallic nanocatalysts offer activity
                      benefits based on structural sensitivity and high surface
                      area. In bimetallic nanoalloys with well-defined shape,
                      site-dependent metal surface segregation additionally
                      affects the catalytic activity and stability. However,
                      segregation on shaped alloy nanocatalysts and their
                      atomic-scale evolution is largely unexplored. Exemplified by
                      three octahedral PtxNi1−x alloy nanoparticle
                      electrocatalysts with unique activity for the oxygen
                      reduction reaction at fuel cell cathodes, we reveal an
                      unexpected compositional segregation structure across the
                      {111} facets using aberration-corrected scanning
                      transmission electron microscopy and electron energy-loss
                      spectroscopy. In contrast to theoretical predictions, the
                      pristine PtxNi1−x nano-octahedra feature a Pt-rich frame
                      along their edges and corners, whereas their Ni atoms are
                      preferentially segregated in their {111} facet region. We
                      follow their morphological and compositional evolution in
                      electrochemical environments and correlate this with their
                      exceptional catalytic activity. The octahedra preferentially
                      leach in their facet centres and evolve into ‘concave
                      octahedra’. More generally, the segregation and leaching
                      mechanisms revealed here highlight the complexity with which
                      shape-selective nanoalloys form and evolve under reactive
                      conditions},
      cin          = {PGI-5},
      ddc          = {610},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {424 - Exploratory materials and phenomena (POF2-424)},
      pid          = {G:(DE-HGF)POF2-424},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000322119100025},
      doi          = {10.1038/nmat3668},
      url          = {https://juser.fz-juelich.de/record/201604},
}