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@PHDTHESIS{Ayhan:1037841,
      author       = {Ayhan, Yavuz Selim},
      title        = {{I}ntegration of a rib-channel design to improve air-side
                      contacting in solid oxide cell ({SOC}) stacks},
      volume       = {651},
      school       = {RWTH Aachen University},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2025-00987},
      isbn         = {978-3-95806-797-4},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {82},
      year         = {2024},
      note         = {Dissertation, RWTH Aachen University, 2024},
      abstract     = {Energy transition worldwide can be realized with the
                      contribution of promising and advanced technologies such as
                      solid oxide cells (SOCs). Although commercial products are
                      on the market, this ceramic-based technology can still be
                      improved to increase both operating efficiency and lifetime,
                      and reduce the cost of the end product. Non-optimal air-side
                      contacting in SOC stacks causes performance loss compared to
                      single-cell measurements and may be avoided by a novel
                      design, which is the direct printing of an air-side
                      electrode contact layer in a rib-channel form. This ceramic
                      layer also provides gas distribution, eliminating the need
                      for machined or stamped gas channels on the metallic
                      interconnect. Since the machining/pressing process is costly
                      and time-consuming, printing this ceramic layer with a novel
                      design might be advantageous in terms of performance
                      enhancement and cost-effectiveness in SOC stacks. To realize
                      the novel idea, stencil printing was used to print ribs from
                      pastes with different recipes and preparation routes. Two
                      different perovskite materials, developed and used in-house,
                      were utilized in the paste preparation. It is observed that
                      changing solid content and binder content by keeping the
                      type of ingredients and the particle size distribution (PSD)
                      within the paste batch the same did not change the
                      rheological behavior. It has been observed that the reason
                      was the lack of a three-dimensional (3D) network within the
                      paste structure which provides structural recovery after the
                      printing. It led to an undesired shape on the printed design
                      because the paste flows and does not retain its printed
                      shape. However, by adding a dispersant and varying the PSD
                      of the powders, the pastes became more controllable, and the
                      influence was directly seen in the shape of printed ribs
                      with sharper edges and flatter surfaces. In addition,
                      rheology results were applied to the printing process to
                      achieve successful printing results, i.e. a delay before
                      separation of the substrate from the stencil was applied
                      according to the timedependent behavior plot obtained from
                      rheology measurements. Thus, ribs with a thickness of about
                      500 μm with an appropriate surface flatness were
                      successfully printed and characterized by electron
                      microscopy, 3D confocal microscopy, and white light
                      topography. As an outlook, the best-performing design,
                      microstructure, and material combination for the rib-channel
                      form will be investigated. In addition, a stack test
                      consisting of cells with this rib-channel design of the
                      cathode contact layer will be performed and evaluated.},
      cin          = {IMD-2},
      cid          = {I:(DE-Juel1)IMD-2-20101013},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1231},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:0001-2501281150356.973657649657},
      doi          = {10.34734/FZJ-2025-00987},
      url          = {https://juser.fz-juelich.de/record/1037841},
}