Plasma‐assisted Engineering of MOF Electrocatalyst for Highly Efficient Oxygen Evolution Reaction

Abstract Metal‐organic frameworks (MOFs) have been extensively investigated as promising oxygen evolution reaction (OER) electrocatalysts due to their highly ordered porous structure and abundant active sites. The reasonable engineering of the MOF materials is the key to highly efficient energy conversion technologies. Here, we present a facile Ar plasma treatment to introduce various defects in MOF nanosheets while maintaining their morphology. The generated coordinatively unsaturated metal sites with electron‐rich structure are conducive to improving intrinsic catalytic activity, and the formed mesopores are beneficial to mass transport during the catalytic process. Compared with the pristine MOF nanosheets grown on nickel foam, the plasma‐etched MOF nanosheets exhibits excellent OER performance with an ultralow overpotential of 213 mV at current density of 50 mA cm −2 . This work could deepen our understanding of the structure‐property relationship of the plasma‐treated MOF electrocatalysts, and open up new prospects for the engineering of highly efficient MOF‐based electrocatalysts.