4.7 Article

Constructing a Z-scheme ZnIn2S4-S/CNTs/RP nanocomposite with modulated energy band alignment for enhanced photocatalytic hydrogen evolution

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 608, Issue -, Pages 482-492

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.09.145

Keywords

Photocatalytic hydrogen evolution; Red phosphorus; Energy band alignment; Nanocomposite; Sulfur vacancies

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The ZIS-S/CNTs/RP nanocomposite, fabricated using an energy band alignment steering strategy, exhibited superior photocatalytic H-2 evolution performance due to efficient photogenerated electron-hole separation and Z-scheme charge transfer mechanism.
Energy band structures greatly determine the charge separation and transfer properties in heterojunction photocatalysts and consequently their photocatalytic activities. Herein, a well-designed Z-scheme ZnIn2S4-S/CNTs/RP (ZIS-S/CNTs/RP) nanocomposite was fabricated according to an energy band alignment steering strategy to realize superior photocatalytic H-2 evolution performance. The ZIS-S/CNTs/RP nanocomposite shows an efficient photocatalytic H-2 evolution rate of 1639.9 mu mol.g(-1)h(-)(1), which is noticeably higher than that of pristine red phosphorus (RP) and CNTs/RP and ZIS-S/RP composites, as well as those of the compared heterojunctions using bulk RP or ZnIn2S4. Owing to the modification of nano-sized RP and the introduction of sulfur vacancies in ZnIn2S4, a tailored energy band alignment of the heterojunction with a higher reduction potential and larger Fermi level potential difference was achieved, which resulted in significantly increased photogenerated electron-hole separation efficiency and a more efficient Z-scheme charge transfer mechanism, thus promoting the photocatalytic activity of ZIS-S/CNTs/ RP. This work aims to provide a novel effective strategy for the construction of high-performance heterojunction photocatalysts by energy band engineering. (C) 2021 Elsevier Inc. All rights reserved.

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