Promoting Electrocatalytic Oxygen Reduction in a Model Composite Using Selective Metal Ions
The oxygen reduction reaction (ORR) is critically important in energy converting systems, and the advancement of a catalyst that accelerates the process is vital. Here, an ORR electrocatalyst was developed by the stoichiometric addition of Co(II) ions to a model composite (FePH) and termed as γ-CoFePH. The developed electrocatalyst shows a significant enhancement in ORR activity with improved Eonset and E1/2 (3 mA cm−2) values, where E1/2 is −0.29 V as compared to −0.60 V for FePH, drifting toward Pt/C and exhibits a limiting current density of −6.3 mA cm−2 which exceeds the commercially available Pt/C. The γ- CoFePH also displays superior resistance toward methanol poisoning and stability of over 40 000 s retaining 83.6% of the current 11 density under alkaline medium.