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@ARTICLE{Endler:10068,
      author       = {Endler, C and Leonide, A. and Weber, A. and Tietz, F. and
                      Ivers-Tiffée, E.},
      title        = {{T}ime-dependent electrode performance changes in
                      intermediate temperature solid oxide fuel cells},
      journal      = {Journal of the Electrochemical Society},
      volume       = {157},
      issn         = {0013-4651},
      address      = {Pennington, NJ},
      publisher    = {Electrochemical Society},
      reportid     = {PreJuSER-10068},
      pages        = {B292 - B298},
      year         = {2010},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {This study gives evidence that the time-dependent
                      performance changes in anode supported cells for
                      intermediate-temperature solid oxide fuel cells is
                      essentially influenced by the mixed ionic-electronic
                      conducting (MIEC) cathode. The impedance spectra recorded
                      during 700 h of operation at 750 degrees C were interpreted
                      using an appropriate equivalent circuit model by (i) a
                      distribution of relaxation time analysis followed by (ii) a
                      complex nonlinear least squares fit. Four electrode
                      polarization processes were separated by selective
                      experimental parameters. The cathodic part, initially the
                      smallest, is only discovered among the anodic contributions
                      by a change in fuel gas composition from H-2-H2O to CO-CO2
                      and increases by $310\%$ (15 m cm(2) at 11 h, 62 m cm(2) at
                      700 h). A Sr (and Co) depletion of the MIEC cathode
                      composition La0.58Sr0.4Co0.2Fe0.8O3-delta possibly caused
                      this degradation. The anodic polarization has a proportion
                      of $92\%$ at the start and decreases to $73\%$ (168 m cm(2)
                      at 11 h, 173 m cm(2) at 700 h). The anode charge-transfer
                      reaction initially causes $60\%$ of the total polarization
                      losses and $50\%$ after 700 h. This is assigned to a change
                      in the triple phase boundary and/or a degradation in ionic
                      conductivity in the anode functional layer. The gas
                      diffusion polarization remains constant at 58 m cm(2).},
      keywords     = {J (WoSType)},
      cin          = {IEF-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB809},
      pnm          = {Rationelle Energieumwandlung / SOFC - Solid Oxide Fuel Cell
                      (SOFC-20140602)},
      pid          = {G:(DE-Juel1)FUEK402 / G:(DE-Juel1)SOFC-20140602},
      shelfmark    = {Electrochemistry / Materials Science, Coatings $\&$ Films},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000273222700036},
      doi          = {10.1149/1.3270047},
      url          = {https://juser.fz-juelich.de/record/10068},
}