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@ARTICLE{Khl:860320,
      author       = {Kühl, S. and Gocyla, M. and Heyen, H. and Selve, S. and
                      Heggen, M. and Dunin-Borkowski, R. E. and Strasser, P.},
      title        = {{C}oncave curvature facets benefit oxygen electroreduction
                      catalysis on octahedral shaped {P}t{N}i nanocatalysts},
      journal      = {Journal of materials chemistry / A Materials for energy and
                      sustainability A},
      volume       = {7},
      number       = {3},
      issn         = {2050-7496},
      address      = {London},
      publisher    = {RSC72819},
      reportid     = {FZJ-2019-01095},
      pages        = {1149 - 1159},
      year         = {2019},
      abstract     = {Studies that demonstrated enhanced electrocatalytic oxygen
                      reduction activities of octahedral PtNi nanocatalysts have
                      routinely motivated and explained their data by the
                      structure-sensitivity of PtNi alloy surfaces in general,
                      more specifically by the favourable performance of the
                      annealed Pt3Ni(111) single crystal surface with a monoatomic
                      Pt skin, in particular. In this contribution, we challenge
                      this view and show that imperfect Ni-enriched {111}
                      nanofacets with concave Pt curvature catalytically
                      outperform flat, well-alloyed, locally ordered {111} and
                      {100} nanofacets in cuboctahedral nanoparticles. To achieve
                      this, we investigate the geometric, compositional, and
                      morphological structure on the ensemble and on the
                      individual particle level of PtNi alloy nano-octahedra. In
                      particular, we track the correlations of these parameters
                      after thermal annealing and link them to their catalytic
                      activity. The level of local compositional and structural
                      disorder appears to be a reliable descriptor and predictor
                      for ORR activity – at least within a family of catalysts.
                      After annealing up to 300 °C, concave Pt {111} facets, with
                      partially flat Ni facets, remained most prevalent, resulting
                      in nanoparticles with pronounced elemental anisotropy. At
                      higher annealing temperature, concave Pt morphologies gave
                      way to cuboctahedra with healed flat {111} and {100} alloy
                      facets. The imperfect concave nano-octahedral catalysts with
                      enhanced local disorder invariably outperformed more ordered
                      particles, yet lagged behind in morphological stability.
                      Faceted PtNi nano-cuboctahedra emerging at 400 °C
                      ultimately offered the most reasonable balance between
                      moderately high activity and good morphological stability.
                      This is why we propose these cuboctahedral shaped Pt alloy
                      nanoparticles as promising PEM cathode fuel cell catalyst of
                      choice. While the present results do not invalidate the
                      exceptional oxygen reduction activity of perfect Pt3Ni(111)
                      “skin” single crystal surfaces, they shed new light on
                      the decade old puzzle about structure–activity
                      relationships of PtNi octahedral nanocrystals.},
      cin          = {PGI-5},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)
                      / DFG project 257727131 - Nanoskalige Pt
                      Legierungselektrokatalysatoren mit definierter Morphologie:
                      Synthese, Electrochemische Analyse, und ex-situ/in-situ
                      Transmissionselektronenmikroskopische (TEM) Studien
                      (257727131)},
      pid          = {G:(DE-HGF)POF3-143 / G:(GEPRIS)257727131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000457268300027},
      doi          = {10.1039/C8TA11298C},
      url          = {https://juser.fz-juelich.de/record/860320},
}