Flexoelectric‐Fenton‐Like System‐Based on 2D Transition Metal Oxides

ABSTRACT Transition metal oxides (TMOs) are widely used in peroxymonosulfate (PMS) based Fenton‐like system. However, the insufficient catalytic efficiency, low stability, and narrow pH range have limited the large‐scale application of Fenton‐like system. Herein, we propose a flexoelectric‐Fenton‐like system based on 2D TMOs. Under mechanical stimuli, flexoelectric polarization ( P flexo ) will be generated in TMOs nanosheets, which can synergistically promote the generation of reactive oxygen species (ROS), and accelerate the regeneration of metal active sites (M n+ ), significantly improving the activation efficiency of PMS. This system can not only completely degrade Rhodamine B (RhB) within 5 min, yielding a kinetic constant of 0.564 min– 1 , but also decompose various organic pollutants (phenol, 2,4‐dichlorophenol, tetracycline, etc .). Notably, after six consecutive cycles, the RhB degradation rate remained at 100%, with a PMS decomposition ratio of 26.5%, which further verifies the favorable recyclability of the system. Furthermore, density functional theory (DFT) calculations confirm that P flexo can optimize the orbital hybridization of metal active sites, thereby promoting electron transfer from TMOs to PMS and reducing the thermodynamic energy barrier. The flexoelectric‐Fenton‐like system provides an alternative for PMS activation by transition metal compounds, laying the foundation for efficient, stable, and sustainable advanced water treatment.