Fast charge transfer and low recombination rate are two vital requirements to achieve high photocatalytic activity. In this work, we report the conversion of flowing water energy to piezoelectric potential on a new type of flexible composite film PVDF-Na_0.5Bi_0.5TiO₃-BiOCl_0.5Br_0.5 (PV-N-B) containing PVDF-Na_0.5Bi_0.5TiO₃ (PV-N) substrate and BiOCl_0.5Br_0.5, which significantly boosts the charge transfer of the photocatalytic composite film, resulting in improved photocatalytic capability by 2.33 times. The role of piezoelectric potential in photocatalysis process has been discussed in detail and the results reveal that higher potential output is more beneficial for photocatalytic performance enhancement. Moreover, the photocatalytic degradation intermediates of tetracycline (TC) over PV-N-B were detected by liquid chromatography-mass spectrometer and the possible photodegradation pathway of TC has been reasonably proposed. It is verified that superoxide radicals are the main active species for PV-N-B to degrade TC. The durability experiments demonstrate the good stability of flexible composite film PV-N-B. In a wider perspective, this work provides an efficient flexible composite film, with great capability in converting flowing water energy into piezoelectric potential and improving photocatalytic activity, to bring the environmental pollution under control.

快速电荷转移和低重组率是实现高光催化活性的两个重要要求。在这项工作中，我们报告了一种新型的包含PVDF-Na _0.5 Bi _0.5 TiO ₃的柔性复合膜PVDF-Na _0.5 Bi _0.5 TiO ₃ -BiOCl _0.5 Br _0.5（PV-NB）的流动水能向压电势的转换。（PV-N）底物和BiOCl _0.5 Br _0.5，这显着促进了光催化复合膜的电荷转移，从而使光催化能力提高了2.33倍。详细讨论了压电势在光催化过程中的作用，结果表明，更高的电势输出更有利于光催化性能的提高。此外，通过液相色谱-质谱仪检测了四环素（TC）在PV-NB上的光催化降解中间体，并合理地提出了TC可能的光降解途径。事实证明，超氧自由基是PV-NB降解TC的主要活性物质。耐久性实验证明了柔性复合膜PV-NB的良好稳定性。从更广泛的角度来看，这项工作提供了一种高效的柔性复合膜，