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@ARTICLE{Celikbilek:866338,
      author       = {Celikbilek, Ozden and Thieu, Cam-Anh and Agnese, Fabio and
                      Calì, Eleonora and Lenser, Christian and Menzler, Norbert
                      H. and Son, Ji-Won and Skinner, Stephen J. and Djurado,
                      Elisabeth},
      title        = {{E}nhanced catalytic activity of nanostructured, {A}-site
                      deficient ({L}a 0.7 {S}r 0.3 ) 0.95 ({C}o 0.2 {F}e 0.8 ){O}
                      3−δ for {SOFC} cathodes},
      journal      = {Journal of materials chemistry / A Materials for energy and
                      sustainability A},
      volume       = {7},
      number       = {43},
      issn         = {2050-7496},
      address      = {London},
      publisher    = {RSC},
      reportid     = {FZJ-2019-05494},
      pages        = {25102 - 25111},
      year         = {2019},
      abstract     = {Lower operating temperatures (≤650 °C) of solid oxide
                      fuel cells (SOFCs) are sought in order to decrease the
                      system costs and improve material compatibility and
                      durability issues. Here, we report A-site deficient
                      (La0.7Sr0.3)0.95(Co0.2Fe0.8)O3−δ (LSCF) perovskite film
                      as a potential high-performance cathode with microstructural
                      details at the nanometre length scale. This cathode exhibits
                      area specific resistance values of as low as 0.037 and 0.1
                      Ω cm2 in a symmetrical cell and peak power densities of 1.4
                      and 1.0 W cm−2 in a Ni/YSZ anode-supported cell at 650 and
                      600 °C, respectively. These values are among the highest
                      reported data for LSCF-type cathodes. X-ray diffraction and
                      electron microscopy analyses revealed a closely related
                      two-phase perovskite structure for LSCF and a
                      well-dispersed, nanoscale B-site spinel phase (CoFeOx)
                      decorating the LSCF surfaces. Detailed investigations were
                      carried out to correlate the surface to bulk elemental
                      composition changes on the film, the catalytic activity of
                      the spinel phase and the crystal structures of the
                      constituents with the oxygen reduction reaction (ORR)
                      kinetics. The oxygen transport parameters calculated from
                      the electrochemical impedance spectra indicate an increase
                      by one-to-two-orders of magnitude in the oxygen
                      surface-exchange coefficient in comparison to nominally
                      stoichiometric, state-of-the-art
                      La0.6Sr0.4Co0.2Fe0.8O3−δ. Such substantial improvements
                      in the electrode performance were attributed to the
                      catalytically active B-site spinel phase precipitated as a
                      result of the A-site deficiency and to the very high active
                      surface area of the film.},
      cin          = {IEK-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      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)16},
      UT           = {WOS:000496150500040},
      doi          = {10.1039/C9TA07697B},
      url          = {https://juser.fz-juelich.de/record/866338},
}