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℃). 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 5m2g^(-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 0.47Wcm^(-2) at 780 ℃, 730 ℃, and 680 ℃, respectively. The 6LSCF-4GDC shows 0.92 Wcm^(-2), 0.71 Wcm^(-2), and 0.54Wcm^(-2) at 780 ℃, 730 ℃, and 680 ℃, respectively. At 780 ℃, the highest fuel cell performance is achieved by the 5LSCF-5GDC, while at 680 ℃ the 6LSCF-4GDC shows the highest performance. The best composition of the porous composite cathodes with LSCF(55m2g^(-1)) and GDC (5 m2g^(-1)) needs to be considered with a function of temperature.