The introduction of a built-in electric field by using ferroelectric materials is an efficient way to modulate the carrier generation and transportation behavior of photocatalysts. Here, we propose a hydrothermal-synthesized Ag₂O/BaTiO₃ heterostructure composite, whose photocatalytic performance can be largely enhanced by a four-way coupling effect among piezoelectricity, pyroelectricity, semiconductor and photoexcitation, referred as the piezo/pyro-phototronic synergistic effect. The photoelectrochemical (PEC) test of Ag₂O/BaTiO₃ shows a high photocurrent density of 3.48 mA/cm² at 1.5 V_SCE, which is 1.5 and 1.3 times as high as that of pristine BaTiO₃ and Ag₂O, respectively, and the transient photocurrent density of the composite at 0.5 V_SCE is 20 times higher than that of the pure BaTiO₃. Under varying temperature field and ultrasonic excitation condition, the photocatalytic degradation efficiency of the Ag₂O/BaTiO₃ composite is enhanced greatly when compared to that under only light illumination condition. This enhancement can be attributed to the attraction and release process of photogenerated carriers during the varying temperature field and ultrasonic excitation cycling. These results indicate that the ferroelectric heterostructure composites can act as a promising photocatalyst in wastewater treatment field under different environmental conditions.

通过使用铁电材料引入内置电场是调节光催化剂载流子生成和传输行为的有效方法。在这里，我们提出了一种水热合成的Ag ₂ O / BaTiO ₃异质结构复合材料，该复合材料的光催化性能可以通过压电，热电，半导体和光激发之间的四向耦合效应而大大增强，这称为压电/热电光子协同效应。 。Ag ₂ O / BaTiO ₃的光电化学测试表明，在1.5 V _SCE下的光电流密度为3.48 mA / cm ²，是原始BaTiO _3的1.5和1.3倍。和Ag ₂ O，分别和复合在0.5伏的瞬时光电流密度_SCE比纯的BaTiO的高20倍₃。在变化的温度场和超声激发条件下，Ag ₂ O / BaTiO ₃的光催化降解效率与仅在光照条件下相比，复合材料的性能大大提高。这种增强可以归因于在变化的温度场和超声激发循环过程中光生载流子的吸引和释放过程。这些结果表明，在不同环境条件下，铁电异质结构复合材料在废水处理领域可作为有前途的光催化剂。