The La0.6Sr0.4Co0.8Fe0.2O3 – δ–Ce0.73Gd0.27O2 – δ composite cathodes (LSCF–GDC) formed from nanopowders by a standard method of mixing precursors followed by their sintering have been investigated. The optimal sintering temperature is found to be 1100°С. No secondary phases are formed in the LSCF and GDC mixture (1 : 1) even at 1400°С. The characteristics of the LSCF–GDC cathodes are found to degrade with the increase in the GDC fraction. The addition of the GDC nanopowder to the composite is shown to accelerate the sintering process, which results in the formation of the denser cathodic structure and, as a consequence, increases the polarization resistance.