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@PHDTHESIS{Han:15103,
      author       = {Han, Feng},
      title        = {{S}ol-gel and nano-suspension electrolyte layers for high
                      performance solid oxide fuel cells},
      volume       = {100},
      issn         = {1866-1793},
      school       = {Ruhr-Universität Bochum},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-15103},
      isbn         = {978-3-89336-694-1},
      series       = {Schriften des Forschungszentrums Jülich : Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      year         = {2010},
      note         = {Record converted from VDB: 12.11.2012; Ruhr-Universität
                      Bochum, Diss., 2010},
      abstract     = {Solid oxide fuel cell (SOFC) is regarded as one of the most
                      efficient and environmental-friendly devices for direct
                      conversion of chemical energy into electricity. For
                      commercialization of SOFCs, the long-term stability and as
                      well as reliability of the system have to be guaranteed, and
                      the manufacturing cost has to be reduced. This can be
                      realized by reducing the operation temperature down to 650
                      ºC, while maintaining adequate system power output. In this
                      work, low-cost wet-chemical processing techniques have been
                      applied to fabricate thin gas-tight electrolyte layers for
                      high performance SOFC applications. The focus of this work
                      is threefold: (1) to prepare sols with nano-scaled particle
                      size distribution and excellent layer formation properties,
                      (2) to deposit thin gas-tight electrolyte with thickness of
                      about 1 μm and a rather low helium leak rate under
                      2.0x10$^{-5}$ (hPa·dm$^{3}$)/(s·cm$^{2}$), (3) to
                      manufacture and characterize SOFCs with high electrochemical
                      performance. The as-prepared single cells with thin
                      gas-tight electrolyte layers showed excellent
                      electrochemical performance. At a cell voltage of 0.7 V, the
                      cells reached high current densities of more than 3
                      A/cm$^{2}$, 1.5 A/cm$^{2}$ and 1.0 A/cm$^{2}$ at 800 °C,
                      650 °C and 600 °C, respectively, which are the SOFCs with
                      the highest power density ever since reported. According to
                      the electrochemical impedance spectroscopy investigation,
                      the area specific ohmic resistances of the single cells are
                      more than 80\% lower than the cells with conventional 10
                      $\mu$m thick electrolytes manufactured by Forschungszentrum
                      Jülich. Due to the excellent performance, the life time and
                      stability of the SOFCs is expected to be improved by
                      operating the cells at reduced temperature (650 ºC to 700
                      ºC) and increased cell voltage. Additionally, the
                      manufacturing cost of the SOFC system can be effectively
                      reduced.},
      cin          = {IEK-1},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/15103},
}