Doping is one of the pathways through which electronic and ionic conductivity can be tuned in metal oxides. In this study, the oxygen reduction reaction (ORR) properties of Ba_0.5Sr_0.5Fe_0.91Al_0.09O_3-δ (BSFAl), Ba_0.5Sr_0.5Fe_0.8Cu_0.2O_3-δ (BSFCu) and Ba_0.5Sr_0.5Fe_0.8Nb_0.2O_3–δ (BSFNb) are investigated using proton conducting (Ba_0.5Sr_0.5Ce_0.6Zr_0.2Gd_0.1Y_0.1O_3-δ, BSCZGY) and oxide ion conducting (La_0.8Sr_0.2Ga_0.8Mg_0.2O_3-δ, LSGM) electrolytes. BSFAl and BSFCu were synthesised through combustion method, whereas BSFNb was synthesised through solid-state method. BSFCu-LSGM/LSGM/BSFCu-LSGM symmetrical cell showed lower area specific resistance (ASR) of 0.077 Ω cm² in air at 850 °C than BSFAl-LSGM/LSGM/BSFAl-LSGM cell. In air medium, symmetrical cells with LSGM exhibited lower ASR values than BSCZGY symmetrical cells owing to its higher ionic conductivity. In order to understand more about the oxygen consumption and release properties in these oxides, thermogravimetric analysis in varying pO₂ were performed. In all pO₂, BSFAl showed the highest weight loss and gain during heating and cooling cycles, while BSFNb showed the lowest weight gain and loss. Detailed discussion on oxygen nonstoichiomtery and ORR of Co-free perovskite-type oxides will be presented in this talk.