To enhance the electrocatalytic activity in the oxygen reduction and the evolution reactions of air electrode materials, we fabricate a double perovskite structured NdBa0.5Sr0.5Co1.5Fe0.5-xNixO5+δ with triple-conducting properties for reversible protonic ceramic cells (RPCCs). In particular, Ni doping into B-site (of ABO3 perovskite structure) is used to tailor the surface properties and bulk diffusion of NdBa0.5Sr0.5Co1.5Fe0.5O5+δ perovskites. Among the various amounts of dopants, doping with 5 mol% Ni significantly increases the activity of oxygen electrodes in moist air, including the conductivity of protons and oxygen-ions. The area specific resistance (ASR) values of the NdBa0.5Sr0.5Co1.5Fe0.45Ni0.05O5+δ (NBSCFN5) electrode in the BaZr0.1Ce0.7Y0.1Yb0.1O3-δ