Effect of Ceria Components on Anode Performance of Ni-base Anode in Hydrocarbon Fueled SOFC

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  • Kishimoto Haruo
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Yamaji Katsuhiko
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Xiong Yue-Ping
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Horita Teruhisa
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Sakai Natsuko
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Brito Manuel E.
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Yokokawa Harumi
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)

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Anode performance of nickel (Ni) - scandia stabilized zirconia (ScSZ) cermet, Ni- samaria doped ceria (SDC) cermet and 1 vol% of SDC finely dispersed Ni-ScSZ cermet (SD-Ni-ScSZ) was examined at 1073 K with hydrocarbon fueled solid oxide fuel cells (SOFCs) consisting of a ScSZ electrolyte and a Ni mesh current collector. At least two anode reaction processes were observed in the impedance spectra for all tested anodes. The one corresponding to the high frequency region was enhanced in the order of the Ni-ScSZ, SD-Ni-ScSZ and Ni-SDC, whereas that observed in the low frequency region seemed to be retarded in the same order. The effect can be ascribed to changing Ni surface state by SDC component in the anode. The SD-Ni-ScSZ anode shows the best performance; that shows the smallest overall anodic resistance and the highest hydrogen content in the outlet gas under the same fuel utilization operation among the tested anodes.

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