The internal electric field formed by spontaneous polarization of ferroelectrics, as a potential driving force to improve the separation efficiency of photo-generated charge carriers, has become one of the research hotspots in photocatalytic field. Here, a series of Ba_1-xSr_xTiO₃ (x = 0.1, 0.15, 0.2, 0.25) nanoparticles with different Curie temperature (T_C) synthesized by hydrothermal method were combined with BiOBr to prepare the (1-y)BiOBr/yBa_0.8Sr_0.2TiO₃ composite photocatalyts. The photocatalytic performance of ferroelectric Ba_1-xSr_xTiO₃ (≤T_C) is superior to that of paraelectric Ba_1-xSr_xTiO₃ (≥T_C). Polarization-electric field hysteresis loops (P-E loops), piezoresponse force microscopy (PFM), electron paramagnetic resonance (EPR) results and photocatalytic degradation experiments at different temperature indicate that the internal electric field of ferroelectric Ba_0.8Sr_0.2TiO₃ can effectively boost charge carrier separation and significantly enhance the photocatalytic performance of BiOBr/Ba_0.8Sr_0.2TiO₃. The photocatalytic degradation efficiency over ferroelectric 0.8BiOBr/0.2Ba_0.8Sr_0.2TiO₃ can be reached to be more than 97% at 35 °C, which is almost 1.5 times and 1.3 times higher than that of individual Ba_0.8Sr_0.2TiO₃ and BiOBr at 55 °C, respectively. This work provides an experimental evidence and a theoretical guidance for the enhanced photocatalytic performance of ferroelectrics and new ideas for the research and development of high efficiency ferroelectric photocatalytic materials.

铁电体自发极化形成的内部电场作为提高光生载流子分离效率的潜在驱动力，已成为光催化领域的研究热点之一。在此，将一系列通过水热法合成的 具有不同居里温度（T _C）的Ba _{1- x} Sr _x TiO ₃（x = 0.1，0.15，0.2，0.25 ）纳米粒子与BiOBr结合制备（1- y）BiOBr / y Ba _0.8 Sr _0.2 TiO ₃复合光催化剂。铁电体Ba _1-的光催化性能_X的Sr _X的TiO ₃（≤ Ť _Ç）优于顺电的Ba _{1- X}锶_X的TiO ₃（≥ Ť _Ç）。极化-电场磁滞回线（ P - ë环路），压电响应力显微镜（PFM），电子顺磁共振（EPR）的结果和光催化降解实验在不同的温度指示铁电Ba中的内部电场_0.8锶_0.2的TiO ₃能有效地促进电荷载流子分离并显着增强BiOBr / Ba的光催化性能_0.8 Sr _0.2 TiO ₃。在35°C时，铁电0.8BiOBr / 0.2Ba _0.8 Sr _0.2 TiO ₃的光催化降解效率可达到97％以上，分别比单个Ba _0.8 Sr _0.2 TiO ₃和1.5 BaO的1.5倍和1.3倍高。BiOBr分别在55°C。这项工作为增强铁电体的光催化性能提供了实验证据和理论指导，为高效铁电体光催化材料的研究和开发提供了新思路。