Promoting Electrocatalytic Oxygen Reduction in a Model Composite Using Selective Metal Ions
journal contributionposted on 09.04.2020, 15:37 by Zubair Ahmed, Parrydeep K. Sachdeva, Ritu Rai, Rajinder Kumar, Takahiro Maruyama, Chandan Bera, Vivek Bagchi
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 density under alkaline medium.