Piezoelectric-Induced Internal Electric Field in Bi2WO6 Nanoplates for Boosting the Photocatalytic Degradation of Organic Pollutants
Piezoelectric-Induced Internal Electric Field in Bi2WO6 Nanoplates for Boosting the Photocatalytic Degradation of Organic Pollutants
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DOI：
10.1021/acsanm.2c01698
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发表时间：
2022-05
影响因子：
5.9
通讯作者：
Zhenying Jiang;X. Tan;Jingyi Xu;Yuxiong Huang
中科院分区：
文献类型：
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作者：
Zhenying Jiang;X. Tan;Jingyi Xu;Yuxiong Huang
利用压电效应产生的内电场来抑制电子空穴的快速复合是一种很有前途的环境修复方法。在此，我们充分利用了Bi 2 WO 6纳米片的压电和光催化性能来去除有机污染物。Bi_2WO_6纳米片使压电陶瓷的降解速率常数显著提高到0.077 min ~（-1），是压电陶瓷的4.2倍。Bi 2 WO 6纳米片的上级催化活性归因于与压电效应诱导的内电场增强相关的加速的电子-空穴对分离效率。基于理论计算，Bi 2 WO 6纳米片的带隙在机械应变下从1.99 eV减小到1.67 eV，表明在压电场的辅助下可以实现更宽的光捕获和更快的电荷转移.因此，多个活性氧物种（·O2-和·OH）是占主导地位的降解活性的基础上淬灭实验和EPR分析，优于压催化和电催化。提出了一种改进催化去污性能的新策略。
The internal electric field induced by a piezoelectric effect is a promising method to suppress rapid electron–hole recombination of photocatalysis for environmental remediation. Herein, we fully utilized both piezoelectric and photocatalytic properties of Bi2WO6nanoplates for the removal of organic pollutants. The degradation rate constant of piezo-photocatalysis is dramatically boosted to 0.077 min–1by the Bi2WO6nanoplates, which is 4.2-fold of the photocatalysis alone. The superior catalytic activity of Bi2WO6nanoplates was attributed to the accelerated electron–hole pair separation efficiency associated with the enhancement of the piezoelectric effect-induced internal electric field. Based on the theoretical calculation, the bandgap of Bi2WO6nanoplates would decrease from 1.99 to 1.67 eV under mechanical strains, indicating that broader light harvesting and faster charge transfer can be achieved with the assistance of the piezoelectric field. Accordingly, multiple reactive oxygen species (·O2–and ·OH) are dominant for the degradation activity based on the quenching experiments and EPR analysis, outperforming piezocatalysis and photocatalysis. We have provided a new strategy to improve the catalytic decontamination performance.