Solid state ionic devices based on high-temperature proton conductors can be used for various applications, especially in a new class of fuel cells, the Protonic Ceramic Fuel Cell (SOFC-H + ). These systems are currently operating at intermediate temperatures (500–600°C) and one of the major problems is the overpotential at the cathode side. In this context, various perovskite oxides AMO 3−δ (A=La, Ba, Sr; M=Mn; Fe, Co, Ni) and A 2 MO 4 -type compounds (A=La, Nd, Pr or Sr; M=Ni) have been investigated. Their properties under moist cathodic atmosphere have been studied. Actually, they are stable and exhibit high electrical conductivity (σ>100Scm −1 ) as well as good electrocatalytic properties towards oxygen reduction.The electrochemical properties of these oxides deposited on the protonic electrolyte BaCe 0.9 Y 0.1 O 3−δ have been studied and the Area Specific Resistances have been measured under air/H 2 O (3%) atmosphere. The obtained values at 600°C, especially for Ba 0.5 Sr 0.5 Fe 0.8 Co 0.2 O 3−δ and Pr 2 NiO 4+δ show to be promising cathode materials for Protonic Ceramic Fuel Cell applications.