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Performance and stability of SOFC anode prepared by co-precipitation

: Mosch, S.; Trofimenko, N.; Kusnezoff, M.; Betz, T.; Kellner, M.


Solid State Ionics 179 (2008), No.27-32, pp.1606-1610
ISSN: 0167-2738
Journal Article
Fraunhofer IKTS ()
Cermet; crystal microstructure; current density; deconvolution; electrochemical electrode; electrochemical impedance spectroscopy; electrochemistry; materials preparation; nickel compound; polarisation; precipitation; solid oxide fuel cell; yttrium compound; zirconium compound

Nickel oxide and yttria stabilized zirconia (NiO/YSZ) cermets have been prepared using a chemical co-precipitation of hydroxides. The influence of different factors on the microstructure and electrochemical properties of the anode was investigated. The anodes were characterized by impedance spectroscopy at open-circuit potential and under current load at 850°C in hydrogen/steam atmosphere (H(sub 2):H(sub 2)O=1:1). The anode polarization resistance was identified by deconvolution of impedance spectra and the influences of current load and pH(sub 2)O on the impedance spectra of the anode were discussed. Long-term stability of the cell with an anode prepared by co-precipitation was carried out over 1000 h under current density of 430-450 mA/cm(sup 2)@0.7 V at 850°C.