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@ARTICLE{Mueller:891867,
      author       = {Mueller, David N. and Giesen, Margret and Duchoň, Tomáš
                      and Cramm, Stefan and Gunkel, Felix and Jugovac, Matteo and
                      Zamborlini, Giovanni and Feyer, Vitaliy and Schneider, Claus
                      Michael},
      title        = {{N}anoscopic {S}urface {D}ecomposition of {P}r 0.5 {B}a 0.5
                      {C}o{O} 3−δ {P}erovskites {T}urns {P}erformance
                      {D}escriptors {A}mbiguous},
      journal      = {The journal of physical chemistry / C},
      volume       = {125},
      number       = {18},
      issn         = {1932-7447},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2021-01787},
      pages        = {10043–10050},
      year         = {2021},
      abstract     = {The surface electronic structure of a material is
                      frequently used to identify simple descriptors for its
                      catalytic efficacy and other properties. To harness the
                      predictive ability of such descriptors, structural and
                      chemical evolutions of the material when exposed to
                      operating conditions, such as oxidizing environments and
                      high temperatures, need to be considered. These evolutions
                      occur at length scales not easily observable, leading to
                      averaging over short-range variations and thus
                      misinterpretation of the property in question. Here, we
                      investigate perovskite Pr0.5Ba0.5CoO3−δ as a prototypical
                      mixed ionic–electronic conductor that exhibits promising
                      catalytic properties toward the oxygen evolution reaction in
                      electrochemical cells, which have been characterized by such
                      descriptors. We employ spatially resolved X-ray absorption
                      spectroscopy and find a Cahn–Hilliard-type decomposition
                      process at sub-micrometer length scales after mere hours at
                      operating or processing conditions. The observation is in
                      contrast to the thermodynamic stability of the
                      Pr0.5Ba0.5CoO3−δ bulk, suggesting the decomposition to be
                      confined to the surface. Our results showcase a considerable
                      lateral inhomogeneity of the surface electronic structure,
                      emphasizing that descriptors derived through spatially
                      averaging techniques have to be heavily scrutinized.},
      cin          = {PGI-6 / PGI-7},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-6-20110106 / I:(DE-Juel1)PGI-7-20110106},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-632},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000651787500047},
      doi          = {10.1021/acs.jpcc.1c00976},
      url          = {https://juser.fz-juelich.de/record/891867},
}