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 (InNCo_2.7Mn_0.3). Pt NPs are highly effective for the oxygen reduction reaction (ORR). InNCo_2.7Mn_0.3 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 InNCo_2.7Mn_0.3 are remarkably enhanced when compared with the commercial Ir/C. As an excellent bifunctional catalyst, Pt/InNCo_2.7Mn_0.3 enables the Zn–air battery to attain perennial cycling performance over 100 h with high efficiency. The combination of Pt NPs with robust InNCo_2.7Mn_0.3 nitride is a very prospective replacement for the conventional Pt/C and Ir/C catalysts for rechargeable Zn–air batteries.