Breaking Symmetry via Bamboo‐Inspired Gradient Engineering for Triple‐Field Synergistic H 2 O 2 Production

作者：Ke‐Qiang Shi, Chengchao Jin, Jia-Hao Sun, Zhi-Yu Gui, Yu-Xing Cai, Daiming Liu, Xu‐Ting Qiu, Lan Li, Ling‐Xia Zhang, Zhi Chen, Qiong Wu · 发表于：Advanced Materials · 年份：2026 · DOI：10.1002/adma.73536 · 被引用次数：1 · 研究领域：Nonlocal and gradient elasticity in micro/nano structures、Multiferroics and related materials、Vibration Control and Rheological Fluids

ABSTRACT Piezocatalysis is a promising chemical synthesis technique, but it is generally restricted to noncentrosymmetric materials, severely limiting catalyst selection. The flexoelectric effect bypasses this symmetry constraint. However, its catalytic contribution is often overlooked, as conventional materials generate only modest strain gradients. Inspired by the hierarchical radial gradients in natural bamboo, we developed radial‐gradient BiO(Cl, Br) nanosheets. This architecture breaks the centrosymmetry of BiOCl to invoke robust piezoelectricity while simultaneously amplifying flexoelectricity through built‐in mechanical heterogeneity. Driven by a triple‐field synergism of built‐in, piezo‐, and flexoelectric fields, the BiO(Cl, Br) nanosheets achieve a high H 2 O 2 production rate of 742.2 µmol g −1 h −1 , approximately 423% of pristine BiOCl. Theoretical analysis reveals that the mechanical strain and Br doping synergistically modulate the work function and the p ‐band center, facilitating spin‐selective O 2 orbital coupling and reducing the activation barrier for superoxide formation. This work provides an effective strategy to break through symmetry constraints in piezocatalysis, paving the way for the rational design of high‐performance mechano‐catalysts through gradient engineering.