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@INPROCEEDINGS{Schnauer:827599,
      author       = {Schönauer, Kathrin and Fang, Qingping and Blum, Ludger and
                      Menzler, Norbert H.},
      title        = {{C}athode contacting in {SOFC} stacks},
      reportid     = {FZJ-2017-01718},
      year         = {2017},
      abstract     = {In SOFC stacks the electrical contact between the ceramic
                      cathode layer and the metallic interconnector (IC) has to be
                      adjusted carefully to minimize the contact resistance and
                      slow down degradation mechanisms. In JÜLICH, ICs made of
                      Crofer22APU or Crofer22H are coated with a MnCo1.9Fe0.1O2
                      spinel (MCF) applied by atmospheric plasma spraying (APS),
                      which prevents the diffusion of volatile Cr species from the
                      steel into the cell. Materials for the cathode contact layer
                      have to be sufficiently good electronic conductors, stable
                      in oxidizing atmosphere, chemically stable and compatible
                      with the adjacent layers, and show a thermal expansion
                      behavior similar to MCF and the cathode material, i. e.
                      La0.58Sr0.4Co0.2Fe0.8O3-x (LSCF).Perovskites of La and Co,
                      doped with Fe, Mn, or Cu on the B-site have been applied by
                      wet powder spraying (WPS) onto the pre-coated IC. These
                      compounds offer a good electrical conductivity and an
                      appropriate thermal expansion but, depending on the
                      composition, they may form several phases instead of a
                      stable single phase. [1] Alternatively, LSCF can also be
                      used for cathode contacting and first tests show promising
                      results with better stack performances than the previously
                      mentioned compounds. Although the thermal expansion
                      coefficient of LSCF is quite large compared to those of MCF
                      and the IC material, the ability for thermal cycles is
                      given. Furthermore, no problems arising from chemical
                      reactions or interdiffusion are expected when the contact
                      layer is made of the same material as the cathode.As an
                      alternative to WPS, the contact layer is screen printed onto
                      the cell. At present, the full cathode is being covered
                      although the contact layer is required only between the IC
                      ribs and the cell. Applying the contact layer as stripes
                      could reduce the amount of material needed and at the same
                      time improve the gas supply from the interconnect channels
                      to the active sites for reduction in the cathode since the
                      gas transport may be the performance limiting factor at the
                      cathode side. [2]A different possibility for contacting the
                      cathode is to use metal foam sheets that are very easy to
                      handle. Two metal foams (CoNi and CuMn, provided by Alantum,
                      Rep. of Korea) have been examined regarding their electrical
                      and mechanical properties at high temperatures to evaluate
                      the suitability for SOFC stacks.References:[1] Montero,
                      Fischer, Tietz, Stöver, Cassir and Villarreal, Solid State
                      Ionics 180, 731 (2009)[2] Geisler, Kromp, Weber and
                      Ivers-Tiffée, Journal of The Electrochemical Society 161,
                      F778 (2014)},
      month         = {Jan},
      date          = {2017-01-30},
      organization  = {7th International Conference on
                       ”Fundamentals $\&$ Development of
                       Fuel Cells”, Stuttgart (Germany), 30
                       Jan 2017 - 3 Feb 2017},
      subtyp        = {After Call},
      cin          = {IEK-1 / IEK-3},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / I:(DE-Juel1)IEK-3-20101013},
      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)6},
      url          = {https://juser.fz-juelich.de/record/827599},
}