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Constructing a Z-scheme ZnIn2S4-S/CNTs/RP nanocomposite with modulated energy band alignment for enhanced photocatalytic hydrogen evolution.
- Source :
-
Journal of Colloid & Interface Science . Feb2022:Part 1, Vol. 608, p482-492. 11p. - Publication Year :
- 2022
-
Abstract
- [Display omitted] 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 ZnIn 2 S 4 -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 μmol g-1h−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 ZnIn 2 S 4. Owing to the modification of nanosized RP and the introduction of sulfur vacancies in ZnIn 2 S 4 , 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219797
- Volume :
- 608
- Database :
- Academic Search Index
- Journal :
- Journal of Colloid & Interface Science
- Publication Type :
- Academic Journal
- Accession number :
- 153868551
- Full Text :
- https://doi.org/10.1016/j.jcis.2021.09.145