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FIE | 前沿研究:反向核壳结构Bi2O3/TiO2催化剂的界面电荷转移和光催化活性研究 |
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论文标题:(反向核壳结构Bi2O3/TiO2催化剂的界面电荷转移和光催化活性研究)
期刊:
作者:Sabina Ait ABDELKADER1, Zhenpeng CUI1, Abdelghani LAACHACHI2, Christophe COLBEAU-JUSTIN1, Mohamed Nawfal GHAZZAL
发表时间:09 Oct 2021
DOI:
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Abstract
In this study, the electronic and photocatalytic properties of core-shell heterojunctions photocatalysts with reversible configuration of TiO2 and Bi2O3 layers were studied. The core-shell nanostructure, obtained by efficient control of the sol-gel polymerization and impregnation method of variable precursors of semiconductors, makes it possible to study selectively the role of the interfacial charge transfer in each configuration. The morphological, optical, and chemical composition of the core-shell nanostructures were characterized by high-resolution transmission electron microscopy, UV-visible spectroscopy and X-ray photoelectron spectroscopy. The results show the formation of homogenous TiO2 anatase and Bi2O3 layers with a thickness of around 10 and 8 nm, respectively. The interfacial charge carrier dynamic was tracked using time resolved microwave conductivity and transition photocurrent density. The charge transfer, their density, and lifetime were found to rely on the layout layers in the core-shell nanostructure. In optimal core-shell design, Bi2O3 collects holes from TiO2, leaving electrons free to react and increase by 5 times the photocatalytic efficiency toward H2 generation. This study provides new insight into the importance of the design and elaboration of optimal heterojunction based on the photocatalyst system to improve the photocatalytic activity.
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