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@PHDTHESIS{Hackl:844540,
      author       = {Hackl, Johanna Maria},
      title        = {{R}eduction properties of a model ceria catalyst at the
                      microscopic scale},
      volume       = {407},
      school       = {Universität Duisburg},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zenralbibliothek, Verlag},
      reportid     = {FZJ-2018-01947},
      isbn         = {978-3-95806-294-8},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {VIII, 98 S.},
      year         = {2018},
      note         = {Universität Duisburg, Diss., 2017},
      abstract     = {Cerium oxide is a rare earth metal oxide with versatile
                      catalytic properties used for many industrial applications.
                      The catalytic behavior of cerium oxide is based on its
                      ability to store and release oxygen by reversibly changing
                      its oxidation state between Ce$^{4+}$ and Ce$^{3+}$. The
                      topic of this thesis is the examination of epitaxial,
                      micrometer-sized, a few monolayers thick cerium oxide
                      islands with (111) and(100) crystal surface terminations,
                      prepared on copper single crystalline substrates. These
                      cerium oxide islands serve as model systems for catalytic
                      oxidation and reduction reactions. The formation of
                      CeO$_{2}$ islands of both surface orientations and their
                      different reduction behaviors were observed simultaneously,
                      in-situ, in real-time and under identical conditions with
                      low energy and photoemission electron microscopy and X-ray
                      absorption spectroscopy. Experiments on the reduction
                      behavior of CeO$_{2}$ (111) and (100) oriented islands were
                      performed using two different approaches: the reduction in a
                      hydrogen atmosphere and the reduction by deposition of
                      metallic cerium in vacuum on top of the originally prepared
                      islands. It was found that the (100) oriented islands became
                      more reduced than the (111) islands in both cases. Analyzing
                      the reduction kinetics of the cerium oxide reduction in
                      hydrogen showed an overall higher reducibillity of the (100)
                      terminated cerium oxide surface, which is not caused by a
                      difference in kinetics between the two surface terminations
                      but by a difference in thermodynamics. This demonstrates
                      that the surface orientation of cerium oxide has a strong
                      effect on its catalytic properties, which is in agreement
                      with predictions by density functional theory calculations.
                      A reduction experiment in hydrogen atmosphere was also
                      performed on a platinum/cerium oxide system, which was
                      prepared by the deposition of Pt on top of CeO$_{2}$ (111)
                      and (100) islands. The observed formation of highly reduced
                      cerium oxide structures decorating the original islands
                      indicated a mixture of platinum and cerium oxide and the
                      formation of active centers for catalysis in these areas.
                      For the (100) islands, the formation of the highly reduced
                      structures was observed to a greater degree, again showing a
                      behavioral difference between the two cerium oxide surface
                      orientations.},
      cin          = {PGI-6},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/844540},
}