Zhao Xiaofei, Li Zhen, Yu Jing, Li Chonghui, Xu Shicai, Li Fengrui, Zhang Chentao, Man Baoyuan, Zhang Chao
School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
College of Physics and Electronic Information, Dezhou University, Dezhou 253023, China.
Nanophotonics. 2022 Jun 10;11(14):3339-3349. doi: 10.1515/nanoph-2022-0194. eCollection 2022 Jul.
The photocatalytic degradation, as an environmental-friendly technology, has great significance for cost-effective and efficient catalysis processes, wherein piezo-photocatalysis can significantly increase the catalytic degradation rate using both solar and mechanical energy. Here, a ternary heterostructure PVDF/ZnO/Au (PZA) nanobrush photocatalyst with high piezo-photocatalytic efficiency was presented via low-temperature hydrothermal and chemical reduction methods. Under both solar and mechanical energy, the current response and degradation rate of the as-synthesized PZA nanobrush all increase significantly compared with that under solar alone and under mechanical energy alone, and the excellent recyclability is investigated. It is found that the PZA nanobrush with ultrasonic-assisted piezo-photocatalysis completely degrade MO of 20 mg/L in 60 min, which exhibits greater enhancement of photocatalytic activity than with stirring-assisted piezo-photocatalysis due to higher power. The high piezo-photocatalytic activity of PZA nanobrush is attributed to the surface plasmon resonance (SPR) coupling of Au and built-in electric field originating from the ZnO and PVDF, which can increase the absorption of visible light, promote the charge transfer and separation of photogenerated electrons/holes. This work introduces the SPR and bipiezotronic effect to improve plasmonic photocatalysis with PZA heterostructures, which offers a new solution in green technologies to design high-performance catalysts for the environmental remediation.
光催化降解作为一种环保技术，对于经济高效的催化过程具有重要意义，其中压电光催化可以利用太阳能和机械能显著提高催化降解速率。在此，通过低温水热法和化学还原法制备了具有高压电光催化效率的三元异质结构PVDF/ZnO/Au（PZA）纳米刷光催化剂。在太阳能和机械能共同作用下，所制备的PZA纳米刷的电流响应和降解速率相比于单独的太阳能和单独的机械能作用下均显著增加，并对其优异的可回收性进行了研究。研究发现，具有超声辅助压电光催化的PZA纳米刷在60分钟内可将20mg/L的甲基橙完全降解，由于功率更高，其光催化活性比搅拌辅助压电光催化表现出更大的增强。PZA纳米刷的高压电光催化活性归因于Au的表面等离子体共振（SPR）耦合以及源自ZnO和PVDF的内建电场，这可以增加可见光的吸收，促进光生电子/空穴的电荷转移和分离。这项工作引入了SPR和双压电效应来改善PZA异质结构的等离子体光催化，为绿色技术中设计用于环境修复的高性能催化剂提供了一种新的解决方案。
