The synthesized carbon-supported Pd-Fe alloy electrocatalysts were characterized for the purpose of the fuel cell
cathode oxygen reduction reaction (ORR). The synthesized catalysts were characterized in terms of structural morphology and
catalytic activity by XRD and electrochemical measurements. Surface cyclic voltammetry was used to confirm the formation
of the Pd–Fe alloy. The catalysts were heat-treated at temperatures ranging from 300 ◦C to 700 ◦C for different aging times, in
order to improve activity and stability. The average particle size of 10.16 nm, and the highest ORR catalytic activity were
obtained at the optimal heat-treatment temperature 300 ◦C for 3h.