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@PHDTHESIS{Bischof:874446,
      author       = {Bischof, Cornelia},
      title        = {{L}eistungssteigerung metallgestützter
                      {F}estelektrolyt-{B}rennstoffzellen ({MSC}s) durch gezielte
                      {O}ptimierungen des {A}noden / {E}lektrolytverbunds},
      volume       = {487},
      school       = {Diss. Bochum},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2020-01447},
      isbn         = {978-3-95806-455-3},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {X, 176},
      year         = {2020},
      note         = {Dissertation, Diss. Bochum, 2019},
      abstract     = {This work addressed the perfomance increase of
                      metal-supported solid oxide fuel cells (MSCs) by
                      optimization of the anode/electrolyte interface. Properties
                      of the anode are strongly influenced by process parameters
                      of the used screen printing process, a powder-based process.
                      In comparison, properties of the electrolyte are influenced
                      by process parameters of a specific physical vapor
                      deposition (PVD) method. In this work, both processes were
                      adapted to increase cell performance by improving cell
                      design, cell layer thicknesses and microstructures. The goal
                      of this work was the increase of the electrochemically
                      active surface and the decrease of polarization resistances
                      of the anode functional layer and ohmic resistances of the
                      electrolyte. In a first step, cells developed in the PhD
                      thesis of Rojek-Wöckner were reproduced and acted as a
                      reference for further development. In a second step, the
                      electrochemically active surface of the anode functional
                      layer was raised. By reducing the sintering temperature,
                      reduced coarsening of the microstructure resulted during
                      processing. However, this was found to be detrimental due to
                      undesired side effects. At low anode thicknesses, mechanical
                      stability of the layered composite anode suffered because of
                      low sintering between the particles. In addition, at high
                      anode functional layer thicknesses, gas permeability
                      suffered because of a both thick and fine-pored layer.
                      Availability of fuel gas in the layered composite anode
                      decreased, leading to increased anode polarization
                      resistance. By increasing the layer thickness, a positive
                      side effect appeared by lowering the surface roughness. A
                      low surface roughness is a requirement for a gas-tight
                      PVD-thin film electrolyte. Therefore, this concept with a
                      thicker anode functional layer was used to successfully
                      implement a cell design with a 2 μm thick PVD-electrolyte.
                      This can be taken as starting point for future improvement
                      of a 2 μm thin-film electrolyte. By increasing the
                      sintering temperature of the functional layer in this design
                      as well, stability and permeability of the layered composite
                      anode were increased. Still, signs of gas diffusion
                      limitation at high current densities became visible. To
                      overcome this, a further improved cell design was
                      implemented. An electrochemically inactive Ni/YSZ-interlayer
                      was exchanged by an electrochemically active Ni/GDC-layer.
                      Compared to the reference cell concept of Rojek-Wöckner,
                      the improved cell design with a double-layered Ni/GDC-anode
                      functional layer enabled a performance increase from 1,29
                      A/cm$^{2}$ to 1,79 A/cm$^{2}$ and therefore by 38\%. The
                      active surface and the permeability of the layered composite
                      anode were increased. Moreover, mechanical stability and
                      reproducibility were enhanced. Furthermore, the cell showed
                      lower deflection after processing easing the handling of the
                      cell during next processing steps like stack assembling
                      [...]},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {135 - Fuel Cells (POF3-135) / SOFC - Solid Oxide Fuel Cell
                      (SOFC-20140602)},
      pid          = {G:(DE-HGF)POF3-135 / G:(DE-Juel1)SOFC-20140602},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/874446},
}