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@ARTICLE{Pizzutilo:843979,
      author       = {Pizzutilo, Enrico and Freakley, Simon J. and Cherevko,
                      Serhiy and Venkatesan, Sriram and Hutchings, Graham J. and
                      Liebscher, Christian H. and Dehm, Gerhard and Mayrhofer,
                      Karl},
      title        = {{G}old–{P}alladium {B}imetallic {C}atalyst {S}tability:
                      {C}onsequences for {H}ydrogen {P}eroxide {S}electivity},
      journal      = {ACS catalysis},
      volume       = {7},
      number       = {9},
      issn         = {2155-5435},
      address      = {Washington, DC},
      publisher    = {ACS},
      reportid     = {FZJ-2018-01497},
      pages        = {5699 - 5705},
      year         = {2017},
      abstract     = {During application, electrocatalysts are exposed to harsh
                      electrochemical conditions, which can induce degradation.
                      This work addresses the degradation of AuPd bimetallic
                      catalysts used for the electrocatalytic production of
                      hydrogen peroxide (H2O2) by the oxygen reduction reaction
                      (ORR). Potential-dependent changes in the AuPd surface
                      composition occur because the two metals have different
                      dissolution onset potentials, resulting in catalyst
                      dealloying. Using a scanning flow cell (SFC) with an
                      inductively coupled plasma mass spectrometer (ICP-MS),
                      simultaneous Pd and/or Au dissolution can be observed.
                      Thereafter, three accelerated degradation protocols (ADPs),
                      simulating different dissolution regimes, are employed to
                      study the catalyst structure degradation on the nanoscale
                      with identical location (IL) TEM. When only Pd or both Au
                      and Pd dissolve, the composition changes rapidly and the
                      surface becomes enriched with Au, as observed by cyclic
                      voltammetry and elemental mapping. Such changes are mirrored
                      by the evolution of electrocatalytic performances toward
                      H2O2 production. Our experimental findings are finally
                      summarized in a dissolution/structure/selectivity mechanism,
                      providing a clear picture of the degradation of bimetallic
                      catalyst used for H2O2 synthesis.},
      cin          = {IEK-11},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-11-20140314},
      pnm          = {134 - Electrolysis and Hydrogen (POF3-134)},
      pid          = {G:(DE-HGF)POF3-134},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000410005700016},
      doi          = {10.1021/acscatal.7b01447},
      url          = {https://juser.fz-juelich.de/record/843979},
}