Fe doped Mo-Ni supramolecular coordination polymer based bifunctional oxygen electrocatalyst with high efficiency and duration for rechargeable zinc-air battery

In the present area of electrochemistry, due to the scarcity and unavailability of precious metals, it is a great challenge and a new opportunity to develop bifunctional electrocatalysts for zinc-air batteries (ZABs) with high activity, low cost and strong durability. In this study, an excellent electrocatalyst (Fe@MoNi/NCP-800) for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) was successfully prepared by pyrolyzing Fe2+ ion doped bimetallic Mo-Ni supramolecular coordination polymer (SCP) at 800 degrees C with carbon paper (CP) as self-supporting material. Owing to its unique FeNi alloy nanotube structure supported by the in situ formed MoN and the trimetallic synergies, the as-obtained electrocatalyst showed superior catalytic performance to that of commercial Pt/C half-wave potential (E1/2) of 0.846 V and RuO2 overpotential (g) of 300 mV. In addition, the ZABs prepared with Fe@MoNi/NCP-800 has a small charge-discharge voltage gap of 0.85 V, high energy efficiency of 35.25% and excellent cycle performance (308 h) at 10 mA cm 2. This research provides a very promising transition-metal alloy multifunctional electrocatalyst for the development of ZABs with high efficiency and duration, and a meaningful idea for the future rational design and synthesis of new coordination polymer or supramolecular coordination polymer-based electrocatalysts. (c) 2023 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.