The aim of this work was to synthesise and deposit a perovskite (La1-x Sr (x) MnO3 or La1-x Sr (x) CoO3) cathode on an SOFC electrolyte (8% Yttria Stabilised Zirconia - YSZ). The recombination of atomic oxygen on Sr doped LaMnO3 was performed in order to study the properties of perovskite for the adsorption of oxygen. The electrical resistance of the layers was measured as a function of the chemical composition. Impedance measurements on different samples were performed in order to analyse the electrochemical response of the cathode - electrolyte stack as a function of temperature and nature of the atmosphere. Moreover, the Faradaic impedance representing the electrochemical processes at the cathode - electrolyte interface was calculated from the global impedance in various conditions.