Cu nanocrystals enhanced charge separation and transfer in superior thin g-C3N4 nanosheets
Authors:
- Baogang Xu,
- Hongyu Zhang,
- Pawel Baran,
- Katarzyna Matras-Postolek,
- Ping Yang
Abstract
A two-step thermal condensation approach was developed to fabricate Cu and graphic carbon nitride (g-C3N4) composites. Cu nanocrystals (NCs) with a size range of 2-5 nm were embedded in superior thin g-C3N4 nanosheets. Although little amount of Cu NCs was incorporated in g-C3N4 nanosheets, Cu/g-C3N4 composites revealed promoting influence towards photocatalytic H2 generation and photodegradation of pollutions. Namely, the sample 680-Cu0.05% (with Cu of 0.05 wt%) revealed the best photocatalytic performance. Electrochemical test indicates that Cu NCs improve the productivity of the samples. Narrowed band gap in Cu/g-C3N4 composite samples resulted in an expanded photo adsorption in visible light range. The composites also revealed enhanced optical current response and small interfacial charge transport resistances compared with pure g-C3N4 nanosheets (sample Pure-680). The photocatalytic H2 generation rate of the composite was ~ 2790 μmol g−1 h−1, which is 2.3 times of that of Pure-680. The degradation efficiency of rhodamine B using the composite sample reached 95.5 % with a photodegradation rate of 0.0774 min−1 and was described a zero-order kinetics model (C0-C=kt) with a process completing within 35 min. The test of photocatalytic hydrogen evolution stability indicated that it was almost no degradation when using the composite sample after 8 cycles. This work proposes an efficient method to improve the separation and transfer efficiencies of photogenerated carriers in g-C3N4 and could be applied in another two-dimensional composite photocatalysts.
- Record ID
- CUTa728702c0b22456499f6c1c91c545afb
- Publication categories
- ;
- Author
- Journal series
- Journal of Alloys and Compounds, ISSN 0925-8388, e-ISSN 1873-4669
- Issue year
- 2022
- Vol
- 919
- Pages
- [1-10]
- Article number
- 165892
- Other elements of collation
- fot.; rys.; schem.; tab.; wykr.; Bibliografia (na s.) - 9-10; Bibliografia (liczba pozycji) - 55; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 919
- Substantive notes
- Appendix A. Supplementary data can be found online at: doi:10.1016/j.jallcom.2022.165892
- Keywords in English
- G-C3N4, nanosheets, Cu nanocrystals, water splitting, photocatalysis
- ASJC Classification
- ; ; ;
- DOI
- DOI:10.1016/j.jallcom.2022.165892 Opening in a new tab
- URL
- https://www.sciencedirect.com/science/article/pii/S0925838822022836 Opening in a new tab
- Language
- eng (en) English
- Score (nominal)
- 100
- Score source
- journalList
- Score
- Publication indicators
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTa728702c0b22456499f6c1c91c545afb/
- URN
urn:pkr-prod:CUTa728702c0b22456499f6c1c91c545afb
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