Efficient Hydrogen Evolution on Antiperovskite CuNCo3 Nanowires by Mo Incorporation and its Trifunctionality for Zn Air Batteries and Overall Water Splitting

Abstract The current development of single electrocatalyst with multifunctional applications in overall water splitting (OWS) and zinc–air batteries (ZABs) is crucial for sustainable energy conversion and storage systems. However, exploring new and efficient low‐cost trifunctional electrocatalysts is still a significant challenge. Herein, the antiperovskite CuNCo 3 prototype, that is proved to be highly efficient in oxygen evolution reaction but severe hydrogen evolution reaction (HER) performance, is endowed with optimum HER catalytic properties by in situ–derived interfacial engineering via incorporation of molybdenum (Mo). The as‐prepared Mo‐CuNCo 3 @CoN nanowires achieve a low HER overpotential of 58 mV@10 mA cm −2 , which is significantly higher than the pristine CuNCo 3 . The assembled CuNCo 3 ‐antiperovskite–based OWS not only entails a low overall voltage of 1.56 V@10 mA cm −2 , comparable to most recently reported metal‐nitride–based OWS, but also exhibits excellent ZAB cyclic stability up to 310 h, specific capacity of 819.2 mAh g −1 , and maximum power density of 102 mW cm −2 . The as‐designed antiperovskite‐based ZAB could self‐power the OWS system generating a high hydrogen rate, and creating opportunity for developing integrated portable multifunctional energy devices.