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@ARTICLE{SchulzeKppers:850317,
      author       = {Schulze-Küppers, F. and Unije, U. V. and Blank, H. and
                      Balaguer, M. and Baumann, S. and Mücke, R. and Meulenberg,
                      W. A.},
      title        = {{C}omparison of freeze-dried and tape-cast support
                      microstructure on high-flux oxygen transport membrane
                      performance},
      journal      = {Journal of membrane science},
      volume       = {564},
      issn         = {0376-7388},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2018-04354},
      pages        = {218 - 226},
      year         = {2018},
      abstract     = {The overall permeation rate through asymmetric oxygen
                      transport membranes is significantly governed by the porous
                      support. Therefore, the microstructuring of the support's
                      pore structure is essential to achieving the highest
                      performances. Freeze casting is already proven to obtain
                      hierarchical porous structures with low tortuosity, which
                      potentially enhances the oxygen flux of oxygen transport
                      membranes. Although a performance improvement has been
                      reported, such improvement is not self-evident. There has
                      yet to be a detailed comparison of the achieved
                      microstructures in order to identify the relevant
                      microstructural parameters. Asymmetric membranes from
                      Ba0.5Sr0.5(Co0.8Fe0.2)0.97Zr0.03O3-δ consisting of a
                      surface-activated 20 µm membrane layer with tape- or
                      freeze-cast supports that have identical pore volume and
                      layer thickness were manufactured, characterized, and
                      compared by means of oxygen flux measurements. They were
                      also microstructurally investigated via computed X-Ray
                      tomography and flow simulation experiments. In the air/Ar
                      gradient, the freeze-cast support membrane performs below
                      the tape-cast-supported membrane. In particular, the
                      transition zone close to the membrane, which is caused by
                      the freezing process, significantly constrains the
                      diffusivity and permeability of the support, and therefore
                      leads to concentration polarizations. At temperatures below
                      800 °C, surface exchange kinetics at the membrane-support
                      interface become rate-limiting.},
      cin          = {IEK-1},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113) / GREEN-CC - Graded Membranes for Energy
                      Efficient New Generation Carbon Capture Process (608524)},
      pid          = {G:(DE-HGF)POF3-113 / G:(EU-Grant)608524},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000442653900023},
      doi          = {10.1016/j.memsci.2018.07.028},
      url          = {https://juser.fz-juelich.de/record/850317},
}