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@INPROCEEDINGS{SchulzeKppers:837678,
      author       = {Schulze-Küppers, Falk and Baumann, Stefan and Ramasamy,
                      Madhumidha and Meulenberg, Wilhelm Albert},
      title        = {{D}evelopment of asymmetric dual phase composite oxygen
                      transport membranes},
      reportid     = {FZJ-2017-06540},
      year         = {2017},
      abstract     = {DEVELOPMENT OF ASYMMETRIC DUAL PHASE COMPOSITE OXYGEN
                      TRANSPORT MEMBRANESFalk Schulze-Küppers 1 – Stefan
                      Baumann 1 – Madhumidha Ramasamy 1– Wilhelm A. Meulenberg
                      11 Forschungszentrum Jülich, Institute of Energy and
                      Climate Research, D-52425 Juelich, Germany, e-mail:
                      f.schulze@fz-juelich.deKeywords: Oxygen Transport Membrane,
                      Cer-Cer Dual Phase, asymmetric Membrane, Tape castingMixed
                      Ionic electronic conductors (MIEC) are potential candidates
                      for various applications including oxygen transport
                      membranes (OTM) due to their high efficiency and infinite
                      selectivity towards oxygen at elevated temperatures [1].
                      Possible applications for OTM are supply of highly pure
                      oxygen or membrane reactors, in which the separated oxygen
                      is directly utilized to form valuable products such as
                      synthetic fuels or bulk chemicals. OTM transport oxygen ions
                      by solid state diffusion through oxygen vacancies, which
                      cannot be occupied by other ions. However, the transport is
                      based on lattice defects and, thus, high-performance OTM
                      materials mainly perovskites (with high defect density and
                      mobility) suffer from limited stability in application
                      conditions with potentially reducing and/or acidic gas
                      atmospheres (requiring low defect density and mobility). One
                      approach to face the trade-off between chemical stability
                      and oxygen flux performance are dual phase composites. In
                      such cer-cer composites two phases are coupled to provide
                      pure electronic and ionic conducting pathway, respectively.
                      In this work, composites of 20 $mol\%$ Gadolinia doped ceria
                      (GDC) as ionic conductor and FeCo2O4 spinel (FCO) as
                      electronic conductor are investigated [2]. GDC-FCO ratio is
                      varied proving that spinel content as low as 10 $wt-\%$ is
                      sufficient to ensure oxygen permeability, although well
                      below the percolation threshold. In addition, the influence
                      of the powder synthesis route on microstructure and
                      corresponding oxygen permeation properties is investigated
                      and compared to state-of-the-art single phase material, i.e.
                      La0.58Sr0.4Co0.2Fe0.8O3-δ (LSCF). In order to increase
                      oxygen flux further, by microstructural optimization of the
                      membrane layout, asymmetric membranes were manufactured by
                      sequential tape casting. Such membranes consist of a thin
                      (~15 µm), dense membrane layer and a porous support
                      porosity (>40 $\%)$ for mechanical stability. An important
                      issue in tape casting is the used raw materials. In order to
                      realize cost efficient manufacturing, a reactive sintering
                      of the membranes was developed, using commercially available
                      CGO, Fe- and Co-oxides as raw material. Oxygen flux in such
                      membranes is clearly limited by surface exchange, due to the
                      low electrochemically active triple phase boundary length,
                      at which oxygen exchange takes place. The performances of
                      bulk and asymmetric membranes are analysed and the potential
                      of this type of materials is discussed with regard to
                      microstructural optimization.References1. J. Sunarso, et.
                      al. “Mixed ionic–electronic conducting (MIEC)
                      ceramic-based membranes for oxygen separation”, J. Mem.
                      Sci., 320, pp.13-41, 20082. M. Ramasamy, et al. “Influence
                      of Microstructure and Surface Activation of Dual-Phase
                      Membrane Ce0.8Gd0.2O2 - FeCo2O4 on Oxygen Permeation” J.
                      Am. Ceram. Soc., 99, pp.349–355, 2016},
      month         = {Jul},
      date          = {2017-07-09},
      organization  = {15th International Conference European
                       Ceramic Society, Budapest (Hungary), 9
                       Jul 2017 - 14 Jul 2017},
      subtyp        = {After Call},
      cin          = {IEK-1},
      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)6},
      url          = {https://juser.fz-juelich.de/record/837678},
}