La 1-x Sr x Co 0.2 Fe 0.8 O 3-δ deposits, of different stoichiometry, were fabricated for SOFC oxygen electrode using atmospheric plasma spraying (APS) with TriplexPro gun. The spraying conditions were developed by correlating, plasma jet characteristics (enthalpy and velocity), in-flight particle properties (temperature and velocity) and deposit quality (phase composition, porosity, coefficient of thermal expansion, electrochemical testing). The optimal cathode deposits exhibited a porosity of about 20 vol.%. The CTE in air flow at 800 °C was, however, 15.6 x 10 -6 K -1 and it was independent of the processing conditions. Electrochemical tests for cathodes were conducted on SOFCs that were produced following metal supported design and had YSZ as electrolyte and NiO+YSZ as anode. At 800 °C, power densities of above 640 mW/cm 2 at 0.7 V were recorded with H 2 /air for cell having La 0.60 Sr 0.40 Co 0.2 Fe 0.8 O 3-δ as cathode. Cells consisting of La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ and La 0.78 Sr 0.2 Co 0.2 Fe 0.8 O 3-δ had 479 and 496 mW/cm 2 under similar conditions. Using equivalent circuit diagrams the contribution of different polarizations on the cell performance were separated and cathodes were compared. La 0.60 Sr 0.40 Co 0.2 Fe 0.8 O 3-δ was found to have the best electrochemical performance followed by La 0.58 Sr 0.40 Co 0.2 Fe 0.8 O 3-δ and La 0.78 Sr 0.20 Co 0.2 Fe 0.8 O 3-δ .