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@ARTICLE{Dionigi:878638,
      author       = {Dionigi, F. and Weber, C. Cesar and Primbs, M. and Gocyla,
                      M. and Bonastre, A. Martinez and Spöri, C. and Schmies, H.
                      and Hornberger, E. and Kühl, S. and Drnec, J. and Heggen,
                      M. and Sharman, J. and Dunin-Borkowski, R. Edward and
                      Strasser, P.},
      title        = {{C}ontrolling {N}ear-{S}urface {N}i {C}omposition in
                      {O}ctahedral {P}t{N}i({M}o) {N}anoparticles by {M}o {D}oping
                      for a {H}ighly {A}ctive {O}xygen {R}eduction {R}eaction
                      {C}atalyst},
      journal      = {Nano letters},
      volume       = {19},
      number       = {10},
      issn         = {1530-6992},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2020-02966},
      pages        = {6876 - 6885},
      year         = {2019},
      abstract     = {We report and study the translation of exceptionally high
                      catalytic oxygen electroreduction activities of
                      molybdenum-doped octahedrally shaped PtNi(Mo) nanoparticles
                      from conventional thin-film rotating disk electrode
                      screenings (3.43 ± 0.35 A mgPt–1 at 0.9 VRHE) to membrane
                      electrode assembly (MEA)-based single fuel cell tests with
                      sustained Pt mass activities of 0.45 A mgPt–1 at 0.9
                      Vcell, one of the highest ever reported performances for
                      advanced shaped Pt alloys in real devices. Scanning
                      transmission electron microscopy with energy dispersive
                      X-ray analysis (STEM-EDX) reveals that Mo preferentially
                      occupies the Pt-rich edges and vertices of the
                      element-anisotropic octahedral PtNi particles. Furthermore,
                      by combining in situ wide-angle X-ray spectroscopy, X-ray
                      fluorescence, and STEM-EDX elemental mapping with
                      electrochemical measurements, we finally succeeded to
                      realize high Ni retention in activated PtNiMo nanoparticles
                      even after prolonged potential-cycling stability tests.
                      Stability losses at the anodic potential limits were mainly
                      attributed to the loss of the octahedral particle shape.
                      Extending the anodic potential limits of the tests to the Pt
                      oxidation region induced detectable Ni losses and structural
                      changes. Our study shows on an atomic level how Mo adatoms
                      on the surface impact the Ni surface composition, which, in
                      turn, gives rise to the exceptionally high experimental
                      catalytic ORR reactivity and calls for strategies on how to
                      preserve this particular surface composition to arrive at
                      performance stabilities comparable with state-of-the-art
                      spherical dealloyed Pt core–shell catalysts.},
      cin          = {ER-C-1},
      ddc          = {660},
      cid          = {I:(DE-Juel1)ER-C-1-20170209},
      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},
      pubmed       = {pmid:31510752},
      UT           = {WOS:000490353500021},
      doi          = {10.1021/acs.nanolett.9b02116},
      url          = {https://juser.fz-juelich.de/record/878638},
}