Structure-tailored superlattice Bi7Ti4NbO21: Coupling octahedral tilting and rotation induced high ferroelectric polarization for efficient piezo-photocatalytic CO2 reduction

作者：Jingren Ni, Rufang Zhao, Chendi Shi, Yuanyuan Ji, Aize Hao, Aiting Xie, Hongjian Yu, Siew Kheng Boong, Hiang Kwee Lee, Chuanqiang Zhou, Jie Han · 发表于：Advanced Powder Materials · 年份：2025 · DOI：10.1016/j.apmate.2025.100265 · 被引用次数：33 · 研究领域：Advanced Photocatalysis Techniques、Perovskite Materials and Applications、Electronic and Structural Properties of Oxides

Intergrowth ferroelectric semiconductors with excellent spontaneous polarization field, are highly promising piezo-photocatalytic candidate materials. In addition, developing structural design and revealing polarization enhancement in-depth mechanism are top priorities. Herein, we introduce the intergrowth ferroelectrics Bi 7 Ti 4 NbO 21 thin-layer nanosheets for piezo-photocatalytic CO 2 reduction. Density functional theory (DFT) calculations indicate that interlayer lattice mismatch leads to increased tilting and rotation angle of Ti/NbO 6 octahedra on perovskite-like layers, serving as the main reason for increased polarization. Furthermore, the tilting and rotation angle of the interlayer octahedron further increase under stress, suggesting a stronger driving force generated to facilitate charge carrier separation efficiency. Meanwhile, Bi 7 Ti 4 NbO 21 nanosheets provide abundant active sites to effectively adsorb CO 2 and acquire sensitive stress response, thereby presenting synergistically advanced piezo-photocatalytic CO 2 reduction activity with a high CO generation rate of 426.97 μmol g −1 h −1 . Our work offers new perspectives and directions for initiating and investigating the mechanisms of high-performance intergrowth piezo-photocatalysts. Intergrowth ferroelectric Bi 7 Ti 4 NbO 21 thin-layer nanosheets (BT-BTN-S), with strong ferroelectric polarization and excellent mechanical force sensitivity, are developed as piezo-photocatalyst for CO 2 reduction. The octah...