Advanced Bifunctional Oxygen Reduction and Evolution Electrocatalyst Derived from Surface-Mounted Metal-Organic Frameworks

Metal‐organic frameworks (MOFs) and their derivatives are considered as promising catalysts for the oxygen reduction (ORR) and oxygen evolution reaction (OER), which are important for many energy provision technologies, such as electrolyzers, fuel cells and some types of advanced batteries. In this work, a “strain modulation” approach has been applied through the use of surface‐mounted NiFe‐MOFs in order to design an advanced bifunctional ORR/OER electrocatalyst. The material exhibits an excellent OER activity in alkaline media, reaching an industrially relevant current density of 200 mA·cm ‐2 at an overpotential of just ~210 mV. It demonstrates operational long‐term stability even at a high current density of 500 mA·cm ‐2 and exhibits the so far narrowest “overpotential window” ΔE ORR‐OER : 0.69 V in 0.1 M KOH with a mass loading being two orders of magnitude lower than that of benchmark electrocatalysts.