Piezocatalysis is a catalytic effect driven by the stress-induced electricity of piezoelectric crystallites. In this study, piezoelectric BaTiO₃ nanowires and nanoparticles were synthesized and their piezocatalytic activity was investigated. The BaTiO₃ nanowires exhibit effectively enhanced piezocatalytic activity under ultrasonic vibration compared with the BaTiO₃ nanoparticles. On the basis of the piezoelectric potential analysis by finite element method simulation for BaTiO₃ nanowires and nanoparticles under ultrasonic vibration, the enhanced piezocatalytic activity of the BaTiO₃ nanowires can be attributed to the larger piezoelectric potential along the polar axis. In addition, we also demonstrate that the intrinsic charge carriers (not piezoelectric charges) in piezoelectric crystallites play the role of charge transfer in the catalysis process through regulating the concentration of charge carriers. Our work provides further understanding of piezocatalysis of piezoelectric nanomaterials as well as insights on the relationship between piezoelectric potential and piezocatalysis.

压电催化是由压电微晶的应力感应电驱动的催化作用。本研究合成了BaTiO ₃压电纳米线和纳米粒子，并对其压电催化活性进行了研究。所述的BaTiO ₃与比较的BaTiO纳米线表现出有效地提高了超声振动下piezocatalytic活性₃纳米颗粒。在超声振动作用下BaTiO ₃纳米线和纳米粒子的压电势有限元模拟分析的基础上，提高了BaTiO _3的压电催化活性。纳米线可归因于沿极轴的较大压电势。此外，我们还证明了压电微晶中的固有电荷载流子（不是压电电荷）通过调节电荷载流子的浓度在催化过程中起电荷转移的作用。我们的工作可进一步了解压电纳米材料的压电催化作用，并提供有关压电电势与压电催化作用之间关系的见解。