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@PHDTHESIS{Keuter:202881,
      author       = {Keuter, Thomas},
      title        = {{I}nnenbeschichtung poröser {K}örper mittels
                      {A}tomlagenabscheidung zur {R}edoxstabilisierung
                      anodengestützter {F}estoxidbrennstoffzellen},
      volume       = {273},
      school       = {Universität Bochum},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2015-05029},
      isbn         = {978-3-95806-069-2},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {XII, 133 S.},
      year         = {2015},
      note         = {Universität Bochum, Diss., 2015},
      abstract     = {Fuel cells convert directly the chemical energy of fuels
                      into electrical energy with a high efficiency and are
                      flexible in use due to their modular design. Anode-supported
                      Solid Oxide Fuel Cells (SOFCs) consist of a nickel/8YSZ
                      substrate (8YSZ ˆ= with 8 $mol-\%$ yttria stabilized
                      zirconia), a nickel/8YSZ anode, an 8YSZ electrolyte, and a
                      cathode. In case of reoxidation of the nickel in the
                      substrate, the substrate expands in lateral direction and
                      creates tensile stresses and cracks in the electrolyte,
                      resulting in a decrease of the cell performance or a
                      complete cell failure. The aim of this work is the
                      stabilization of anode-supported SOFCs with respect to
                      reoxidation by coating the inner surface of the porous
                      substrate, using the process of atomic layer deposition
                      (ALD). The deposited layer protects the nickel in the
                      substrate against oxidation and prevents in this way a crack
                      formation in the electrolyte and a cell failure. More
                      generally, the inner surface coating of porous media using
                      ALD is investigated experimentally and described
                      theoretically by a model. Atomic layer deposition of
                      zirconia using the precursors TEMAZ and O$_{2}$ was
                      developed in the in-house ALD machine, because this process
                      is not described in literature. In order to model atomic
                      layer deposition, Knudsen diffusion and second-order surface
                      reaction kinetics of the precursors were combined and the
                      thickness of the deposited layer within the porous medium
                      was predicted. The inner surface coating of Ni/8YSZ
                      substrates was proven by a conformal coating of the grains
                      and the ALD model was verified. The zirconia layer protected
                      the coated parts of the substrate for at least 17 redox
                      cycles. It was not possible to coat the entire inner surface
                      of the substrate and consequently, reoxidation of the
                      substrate led to cracks in the electrolyte. The zirconia
                      layer did not influence the electrochemical performance of
                      the SOFC leading to the conclusion that a complete coating
                      of the substrate can solve the problem of reoxidation.
                      Additionally, the combination of a thin electrolyte and a
                      low operating temperature is promising, too.},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {899 - ohne Topic (POF3-899) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-899 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/202881},
}