Atomized silver spheres (˜20-50 ?m diameter) were coated with 1 micron thick layers of (La0.6Sr0.4)0.98Co0.2Fe0.8O3 or Sm0.5Sr0.5CoO3 via a mechanofusion dry processing method. The materials were subsequently assessed as solid oxide fuel cell cathodes on anode-supported YSZ electrolytes at 650º-750ºC. The materials were subject to significant electrochemical conditioning during initial cell operation, and factors , such as temperature and operating voltage, affecting the conditioning rate are discussed. Post-conditioned power densities (at 0.7 V) were typically 550-650, 400-450 and 300-350 mW/cm2 at 750, 700 and 650ºC, respectively. Though power degradation rates of ˜7.5 and 4.5% (per 1000 hours) were observed at 750 and 700ºC, respectively, no degradation was detected over almost 2000 hours of testing at 650ºC.
Revised: August 6, 2009 |
Published: May 25, 2007
Citation
Simner S.P., M.D. Anderson, J.W. Templeton, and J.W. Stevenson. 2007.Silver-Perovskite Composite SOFC Cathodes Processed via Mechanofusion.Journal of Power Sources 168, no. 1:236-239.PNNL-SA-53756.doi:10.1016/j.jpowsour.2007.03.029