光电流
光降解
材料科学
光催化
辐照
异质结
可见光谱
热液循环
光电子学
化学工程
催化作用
化学
物理
有机化学
工程类
核物理学
作者
Tayyebeh Soltani,Ahmad Tayyebi,Byeong–Kyu Lee
标识
DOI:10.1016/j.cattod.2018.09.030
摘要
The fabrication of p–n junctions with built-in electric field effect between n-type BiVO4 (BVO) and p- type BiFeO3 (BFO) can be efficient strategy to separate photogenerated carriers and enhances photocurrent density and photostability in BVO. We developed a facile ultrasonic/hydrothermal route to successfully synthesize BFO/BVO p–n junction that greatly improved the performance of n-type BVO and p-type BFO for photocatalytic degradation of tetracycline (TC) and photoelectrochemical (PEC) water splitting. The photodegradation of TC by BVO and BFO was highly dependent on solution pH, but that by BFO/BVO was not. The BFO/BFO p–n junction nanostructures improved the photocatalytic degradation of TC from 31% and 22% with BFO to 84% and 95% with BFO/BVO p–n junction at pH 6.7 and 9.5, respectively, and also from 37% with BVO to 84% with BFO/BVO p–n junction at pH = 2.5. The BFO/BVO nanostructures showed good photocurrent density of 0.36 mA cm −2 under UV–vis light and 0.23 mA cm-2 under visible light at 1.0 V vs. Ag/AgCl, which are 3.0- and 3.28-fold greater than those of BVO. The structures also showed great stability (more than 88% of the initial photocurrent density) over 1 h, whereas BVO had poor stability (63%). The difference between photocurrent densities from front- and back-side illumination in the BFO/BVO p–n junction was substantially reduced to 0.04 mA cm-2 as compared to 0.11 mA cm-2 in BVO due to the formation of a p–n heterojunction between p-type BFO and n-type BVO. The stable BFO/BVO p–n junction also showed the highest charge carrier density as compared to BVO.
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