Abstract
Composite cathodes with La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) and Ce0.9Gd0.1O1.95 (GDC) are investigated to assess for solid oxide fuel cell (SOFC) applications at relatively low operating temperatures (650–800 °C). LSCF with a high surface area of 55 m2g−1 is synthesized via a complex method involving inorganic nano-dispersants. The fuel cell performances of anode-supported SOFCs are characterized as a function of compositions of GDC with a surface area of 5 m2g−1. The SOFCs consist of the following: LSCF-GDC composites as a cathode, GDC as an interlayer, yttrium stabilized zirconia (YSZ) as an electrolyte, Ni-YSZ (50: 50 wt%) as an anode functional layer, and Ni-YSZ (50: 50 wt%) for support. The cathodes are prepared for 6LSCF-4GDC (60: 40 wt%), 5LSCF-5GDC (50: 50 wt%), and 4LSCF-6GDC (40: 60 wt%). The 5LSCF-5GDC cathode shows 1.29 Wcm−2, 0.97 Wcm−2, and 0.47 Wcm−2 at 780 °C, 730 °C, and 680 °C, respectively. The 6LSCF-4GDC shows 0.92 Wcm−2, 0.71 Wcm−2, and 0.54 Wcm−2 at 780 °C, 730 °C, and 680 °C, respectively. At 780 °C, the highest fuel cell performance is achieved by the 5LSCF-5GDC, while at 680 °C the 6LSCF-4GDC shows the highest performance. The best composition of the porous composite cathodes with LSCF (55 m2g−1) and GDC (5 m2g−1) needs to be considered with a function of temperature.
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Kim, J.H., Park, Y.M., Kim, T. et al. Characterizations of composite cathodes with La0.6Sr0.4Co0.2Fe0.8O3−δ and Ce0.9Gd0.1O1.95 for solid oxide fuel cells. Korean J. Chem. Eng. 29, 349–355 (2012). https://doi.org/10.1007/s11814-011-0131-4
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DOI: https://doi.org/10.1007/s11814-011-0131-4