压电
光电流
异质结
半导体
电场
材料科学
光电子学
极化(电化学)
光催化
光电效应
载流子
纳米技术
化学
复合材料
催化作用
物理
物理化学
生物化学
量子力学
作者
Lihao Liu,Mengnan Ruan,Chengyi Wang,Zhifeng Liu
标识
DOI:10.1021/acsaelm.4c00804
摘要
BiVO4 (BVO) is a typical bismuth-based photocatalyst widely utilized across various fields. Nonetheless, its visible light catalytic activity remains constrained by several challenges, including limited light responsiveness and low charge separation efficiency. In this study, we developed a simple method based on the BiVO4/Bi2MoO6 heterojunction to effectively address these issues. This is the first instance of introducing artificial O-vacancies (OVs) into Bi2MoO6 (BMO), in combination with a piezoelectric polarized electric field. Under ultrasonic conditions, the photocurrent density of Ovs BVO/BMO reached 0.34 mA/cm2 at 1.23 VRHE (6.3 times that of naked BVO). The data show that the combination of BVO and BMO improves the photoresponse range of the photoelectrode and the special migration path formed accelerates the separation of photogenerated charge. Due to the excellent piezoelectricity of the two, the recombination of photogenerated charge is significantly inhibited after the introduction of an internal electric field. OVs provide an intermediate level in the band gap, thereby aiding in charge transfer and separation processes. When subjected to ultrasonic waves, they are more prone to becoming stress points, thereby stimulating the piezoelectric polarization of the sample. This work provides a reference for improving the performance of piezoelectric-photoelectric catalysis (piezo-PEC) based on heterojunctions and provides an optimization idea for the field of piezo-PEC.
科研通智能强力驱动
Strongly Powered by AbleSci AI