异质结
材料科学
光催化
面(心理学)
吸收(声学)
光电子学
带隙
化学工程
纳米技术
复合材料
催化作用
化学
人格
工程类
生物化学
心理学
社会心理学
五大性格特征
作者
Hongwei Nie,Zuoyin Liu,Bo Hyun Kong,Xiang Xu,Wentao Wang
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2024-04-02
卷期号:35 (24): 245402-245402
被引量:1
标识
DOI:10.1088/1361-6528/ad32d6
摘要
Abstract The prevailing theoretical frameworks indicate that depending on the growth conditions, the Bi 2 WO 6 (001) surface can manifest in three distinct terminations—DL-O–Bi (DL: double layers), O–Bi, and O–W. In this study, we conduct a comprehensive examination of the interplay between these terminations on Bi 2 WO 6 (001) and the 1I-terminated BiOI(001) facet, especially focusing on their impact on the photocatalytic activity of Bi 2 WO 6 /BiOI heterostructure, applying hybrid functional calculations. The models formulated for this research are designated as Bi 2 WO 6 (O–Bi)/BiOI(1I), Bi 2 WO 6 (DL-O–Bi)/BiOI(1I), and Bi 2 WO 6 (O–W)/BiOI(1I). Our findings reveal that Bi 2 WO 6 (O–Bi)/BiOI(1I) shows a type II band alignment, which facilitates the spatial separation of photo-generated electrons and holes. Notably, the Bi 2 WO 6 (DL-O–Bi)/BiOI(1I) configuration has the lowest binding energy and results in an S-scheme (or Step-scheme) heterostructure. In contrast to the type II heterostructure, this particular configuration demonstrates enhanced photocatalytic efficiency due to improved photo-generated carrier separation, augmented oxidation capability, and better visible-light absorption. Conversely, Bi 2 WO 6 (O–W)/BiOI(1I) presents a type I projected band structure, which is less conducive for the separation of photo-generated electron–hole pairs. In summation, this investigation points out that one could significantly refine the photocatalytic efficacy of not only Bi 2 WO 6 /BiOI but also other heterostructure photocatalysts by modulating the coupling of different terminations via precise crystal synthesis or growth conditions.
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