Electro-Bendable Metal–Organic Framework Nanosheets Enable Durable Electrocatalytic Water Oxidation at 1 A/cm2

High Resolution Image Download MS PowerPoint Slide The oxygen evolution reaction (OER) is a pivotal process in electrochemical systems, including metal-air batteries and water-splitting technologies. Despite the promise of metal–organic frameworks (MOFs) as OER electrocatalysts, their stability at elevated current densities (>500 mA cm –2 ) remains a key challenge for industrial applications. Herein, we developed a bimetallic MOF electrocatalyst, Fe 8.47 Ni 91.53 -2-amino-1,4-benzendedicarboxylate (Fe 8.47 Ni 91.53 -BDC-NH 2 ), exhibiting good stability at 1 A cm –2 for 100 h, with overpotentials of only 210 mV at 10 mA cm –2 and 273 mV at 100 mA cm –2 . The enhanced activity of the catalyst originates from the bending of freestanding FeNi-BDC-NH 2 nanosheets toward the nickel foam substrate during the OER, facilitating the formation of enlarged Mott–Schottky regions and accelerating electron transfer. Additionally, the reversible structural transformation of Ni-2-amino-1,4-benzendedicarboxylate (Ni-BDC-NH 2 ) during the OER, coupled with the introduction of Fe ions, effectively prevents the overoxidation of the active β-NiOOH intermediate to γ-NiOOH, further boosting the OER performance. This work provides insights into structural and electronic modifications that enable MOFs to achieve both high performance and stability at industrial current densities.