The internal polarizations of polar photocatalysts could be enhanced through unit cell structure modulations to improve their photocatalytic performances. In this work, a simple, robust and low-cost NaOH etching process is developed to treat ultrathin BiWO nanosheets after their creation, resulting in a higher degree of polyhedron distortion (∼141 %) and an enhanced piezoelectricity (∼260 % the maximum effective piezoelectric coefficient ). Compared with pristine ultrathin BiWO nanosheets, these etched samples demonstrate an improved charge carrier separation and transfer behavior due to their enhanced internal polarization with the assistance of richer oxygen vacancies, which largely enhance their piezocatalysis (∼4.6 times), photocatalysis (∼14.3 times) and especially coupled photopiezocatalysis (∼33.9 times) performances as demonstrated in their sulfamethoxazole (SMX) degradation performances. ·O, O and are proven to be main reactive oxygen species (ROSs) during their photopiezocatalytic process and they could also work well in the real water matrix.

中文翻译：

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通过超薄 Bi2WO6 纳米片极性光催化剂的合成后结构变形增强自发极化，从而实现卓越的光压电催化性能


极性光催化剂的内部偏振可以通过晶胞结构调制来增强，从而提高其光催化性能。在这项工作中，开发了一种简单、稳健且低成本的 NaOH 蚀刻工艺来处理超薄 BiWO 纳米片，从而产生更高程度的多面体畸变 (∼141%) 和增强的压电性 (∼260% 最大有效值)压电系数）。与原始超薄 BiWO 纳米片相比，这些蚀刻样品由于在更丰富的氧空位的帮助下增强了内部极化，表现出改进的载流子分离和转移行为，这大大增强了它们的压电催化（~4.6 倍）、光催化（~14.3 倍）特别是耦合光压电催化（∼33.9 倍）性能，如磺胺甲恶唑 (SMX) 降解性能所示。 ·O、O 和 O 被证明是光压电催化过程中主要的活性氧（ROS），并且它们在真实的水基质中也能很好地发挥作用。