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@ARTICLE{EndlerSchuck:18147,
      author       = {Endler-Schuck, C. and Leonide, A. and Weber, A. and
                      Uhlenbruck, S. and Tietz, F. and Ivers-Tiffée, E.},
      title        = {{P}erformance analysis of mixed ionic–electronic
                      conducting cathodes in anode supported cells},
      journal      = {Journal of power sources},
      volume       = {196},
      issn         = {0378-7753},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-18147},
      pages        = {7257 - 7262},
      year         = {2011},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The analysis of mixed ionic electronic conducting (MIEC)
                      cathodes with respect to operation temperature and time is
                      essential for a target-oriented development of
                      anode-supported solid oxide fuel cells (ASCs). This study
                      tracks both issues by impedance spectroscopy on a
                      high-performance cathode with the composition
                      La0.58Sr0.4Co0.2Fe0.8O3-delta (LSCF).A wide set of impedance
                      spectra were sampled at 600,750 and 900 degrees C over the
                      entire operation time of 1000 h. The identification and
                      quantification of the individual anodic and cathodic
                      contributions to the polarization losses of an ASC were
                      enabled by an appropriate equivalent circuit model. For this
                      purpose, the impedance data sets were evaluated subsequently
                      by (i) a DRT (distribution of relaxation times) analysis
                      followed by (ii) a CNLS fit. The cathodic polarization
                      resistance is attributed to the oxygen surface exchange and
                      the bulk diffusion of oxygen ions and is described by a
                      Gerischer element.The anodic polarization resistance is
                      described by a Warburg element and two RQ elements according
                      to physical origins. The thorough analysis of all data sets
                      leads to the surprising outcome that the cathode degradation
                      is most pronounced and moreover, increases with decreasing
                      temperature. After 1000 h of operation, the cathode
                      polarization resistance raised steeply from $0.012\%/h$ at
                      900 degrees C over $0.28\%/h$ at 750 degrees C to $1.49\%/h$
                      at 600 degrees C. These latest findings will have
                      far-reaching implications for the development of MIEC
                      cathodes. (C) 2010 Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {IEK-1},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      shelfmark    = {Electrochemistry / Energy $\&$ Fuels},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000292661800028},
      doi          = {10.1016/j.jpowsour.2010.11.079},
      url          = {https://juser.fz-juelich.de/record/18147},
}