Double‐Confinement Construction of Atomically‐Dispersed‐Fe Bifunctional Oxygen Electrocatalyst for High‐Performance Zinc‐Air Battery

Abstract

AbstractSimultaneously achieving high activity for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is the key to constructing rechargeable Zn‐air batteries (ZABs). Here the complexation of 1,10‐phenanthroline and the spatial confinement effect of closo‐[B12H12]2− are used to solidify metal‐boron‐cluster‐organic‐polymers on the surface of SiO2 microspheres to construct a bifunctional oxygen electrocatalyst (FeBCN/NHCS). Driven by FeBCN/NHCS, the half‐wave‐potential of ORR surpasses that of the Pt/C catalyst, reaching 0.893 V versus RHE, and the overpotential (η10) of OER is as low as 361 mV. The ZABs of FeBCN/NHCS as an air cathode not only have high power density and specific capacity, but also have charge‐discharge durability. The FeBCN/NHCS is not only related to the high specific surface area, but also the high exposure rate of single‐atom Fe and the doping of heteroatom B. This study provides an efficient oxygen electrocatalyst and also contributes wisdom to the acquisition of highly active oxygen electrocatalyst.