Despite the favorable absorption of BiVO₄ to visible light, the photogenerated charges in BiVO₄ are weak in catalysis and most of them were recombined before reaching the catalyst surface due to their low energy as well as poor separation and transfer capacities. In this work, we used piezo-potential generated in a strained ZnO nanorod to evaluate the photoelectrons energy and promote the charge separation and transfer in BiVO₄ quantum dots. The BiVO₄ quantum dots were decorated on the ZnO nanorod to construct a piezo-potential assisted photocatalyst. Our results indicated that the visible photodegradation rate of ZnO nanorod arrays with optimized BiVO₄ quantum dots decoration was significantly improved in formaldehyde degrading under mechanical stimulation. The concentration of formaldehyde was decreased to ∼0.2 ppm from 1 ppm in 1 hour, which is ∼2.5 times than that without piezo-potential assistance. The negative electric field generated in the ZnO nanorod when compressively strained was believed to have evaluated the conduction band of BiVO₄ and thus the photoelectron energy. Moreover, the photoelectrons and holes were promptly driven to be transferred in the opposite direction before recombination by the piezoelectric field. These promotions lead to remarkably enhanced charge separation rate, which is directly responsible to the improved photocatalytic activity of the BiVO₄ quantum dots.

尽管BiVO的有利吸收₄可见光，在BiVO光生电荷₄是在催化弱，其中大部分在到达催化剂表面之前重组，由于它们的低能量，以及差的分离和转移的能力。在这项工作中，我们使用了在应变ZnO纳米棒中产生的压电势来评估光电子能量，并促进BiVO ₄量子点中的电荷分离和转移。将BiVO ₄量子点修饰在ZnO纳米棒上，以构建压电势辅助的光催化剂。我们的结果表明，优化的BiVO ₄对ZnO纳米棒阵列的可见光降解率。在机械刺激下，量子点装饰可显着改善甲醛降解。甲醛的浓度从1小时内的1 ppm降低到了约0.2 ppm，是没有压电助剂时的约2.5倍。据信，当压缩应变时，ZnO纳米棒中产生的负电场已经评估了BiVO ₄的导带，从而评估了光电子能。此外，在通过压电场复合之前，光电子和空穴被迅速驱动以沿相反方向转移。这些促进导致电荷分离速率显着提高，这直接与BiVO ₄量子点的光催化活性提高有关。