Precisely Constructing Orbital‐Coupled Fe─Co Dual‐atom Sites for High‐Energy‐Efficiency Zn–Air/Iodide Hybrid Batteries

Abstract

Rechargeable Zn‐air batteries (ZABs) are promising for energy storage and conversion. However, the high charging voltage and low energy efficiency hinder their commercialization. Herein, we address these challenges by employing precisely constructed multifunctional Fe‐Co diatomic site catalyst (FeCo‐DACs) and integrating iodide/iodate redox into ZABs to create Zinc‐air/iodide hybrid batteries (ZAIHBs) with highly efficient multifunctional catalyst. The strong coupling between the 3d orbitals of Fe and Co weakens the excessively strong binding strength between active sites and intermediates, enhancing the catalytic activities for oxygen reduction/evolution reaction and iodide/iodate redox. Consequently, FeCo‐DACs exhibits outstanding bifunctional oxygen catalytic activity with a small potential gap (ΔE = 0.66 V) and outstanding stability. Moreover, an outstanding catalytic performance towards iodide/iodate redox is obtained. Therefore, FeCo‐DAC‐based ZAIHBs exhibit high energy efficiency of up to 75% at 10 mA cm‐2 and excellent cycling stability (72% after 500 hours). This research offers critical insights into the rational design of DACs, and paves the way for high‐energy efficiency energy storage devices.This article is protected by copyright. All rights reserved