Accordion‐Like MXene Confined Metal–Organic Framework Achieves Ultrahigh Oxygen Evolution Activity

ABSTRACT

Metal–organic frameworks (MOFs) have emerged as promising platforms for developing high‐performance oxygen evolution reaction (OER) electrocatalysts. However, their inherently poor conductivity and sluggish kinetics significantly limit OER activity, which hinders practical applications. Herein, we demonstrate a novel strategy to enhance the OER performance of Ni‐btc MOFs through the spatial confinement effect of accordion‐like MXene. The optimized Ni‐btc/Ti ₃ C ₂ T _x catalyst achieves an exceptional OER performance with an overpotential of 225 mV at 10 mA cm ⁻² and stability for 144 h under a high current density of 1000 mA cm ⁻² , in sharp contrast to pristine Ni‐btc (309 mV at 10 mA cm ⁻² ). In situ electrochemical impedance spectroscopy (EIS) analyses reveal that the spatial confinement effect induced by MXene optimizes the adsorption kinetics of reaction intermediates, accelerates electron transfer dynamics, and enhances mass transport during OER. This study demonstrates that spatial confinement strategies can effectively improve the reaction kinetics in OER processes, thereby enhancing catalytic activity.