Carbon-supported Pd-Fe electrocatalysts for oxygen reduction reaction (ORR) and their methanol tolerance

► Pd-Fe/C catalysts prepared at low temperature did not show any lattice contraction. ► These catalysts show ∼75-100 mV positive shift in half-wave potential of ORR relative to Pd/C. ► Peroxide formation on Pd-Fe/C bimetallic catalysts is higher than that on Pt/C. ► Oxide formation on Pd-Fe/C is shifted to higher potential by ∼50 mV from that of Pd/C. ► Thermodynamic effects seem to operate on Pd-Fe/C catalysts.