Robust InNCo_3–xMn_x Nitride-Supported Pt Nanoparticles as High-Performance Bifunctional Electrocatalysts for Zn–Air Batteries

Electrocatalysts at the air cathode play a crucial part in determining the cycling life of rechargeable metal–air batteries. Herein we demonstrate a highly durable and efficient nitride-based bifunctional catalyst consisting of Pt nanoparticles (NPs) and antiperovskite nitride (InNCo2.7Mn0.3). Pt NPs are highly effective for the oxygen reduction reaction (ORR). InNCo2.7Mn0.3 acts as not only an excellent catalyst for the oxygen evolution reaction (OER) but also a robust support that can be chemically stable in alkaline media and over the potential range of an air cathode as well. The activity and durability of InNCo2.7Mn0.3 are remarkably enhanced when compared with the commercial Ir/C. As an excellent bifunctional catalyst, Pt/InNCo2.7Mn0.3 enables the Zn–air battery to attain perennial cycling performance over 100 h with high efficiency. The combination of Pt NPs with robust InNCo2.7Mn0.3 nitride is a very prospective replacement for the conventional Pt/C and Ir/C catalysts for rechargeable Zn–air batteries.