Kg‐Scale Synthesis of Ultrathin Single‐Crystalline MOF/GO/MOF Sandwich Nanosheets with Elevated Electrochemical Performance

Abstract The scalable preparation of 2D ultrathin metal–organic framework (MOF) nanosheets remains a significant challenge due to low stripping efficiency and susceptibility to agglomeration. Herein, a facile strategy is developed for the synthesis of 2D ultrathin single‐crystal MOF/graphene oxide (GO)/MOF (MGM) sandwich‐like nanosheets based on the Ni/Co‐BDC MOF (BDC = 1,4‐terephthalic acid), with GO serving as a structure‐directing agent. Impressively, 1 kg of MGM nanosheets can be obtained in a single batch with a metal‐based yield of 98.73%. Furthermore, the universality of this strategy is implemented by the successful synthesis of three additional 2D ultrathin nanosheets: MGM 7 ‐ABDC, MGM 7 ‐FBDC, and MGM 7 ‐BPDC (metal = Ni, Co; ligands = 2‐aminoterephthalic acid (2‐ABDC), 2‐fluoroterephthalic acid (2‐FBDC), and 4,4′‐ biphenyl dicarboxylic acid (BPDC)). The as‐prepared MGM 7 nanosheets (Ni: Co ratio = 7:3) exhibit excellent electrochemical performance as the cathode for aqueous basic zinc battery (159.2 mA h g −1 at 1 A g −1 ), anode for sodium‐ion battery (SIB, 593.0 mA h g −1 at 0.2 A g −1 ), and electrocatalyst for the oxygen evolution reaction (OER, 224 mV overpotential at 10 mA cm −2 ), significantly outperforming both bulk MOFs and conventional MOF nanosheets. This work enables the scalable synthesis of 2D MOF nanosheets with enhanced properties for multiple applications.