N-doped carbon layer promoted charge separation/transfer in WP/g-C3N4 heterostructures for efficient H2 evolution and 4-nitrophenol removal
Authors:
- Tong Song,
- Xiao Zhang,
- Katarzyna Matras-Postolek,
- Ping Yang
Abstract
Monodispersed WP nanoparticles were encapsulated in nitrogen-doped carbon (NC) layers via thermal polymerization at high temperature. The intimate interface between WP and NC accelerated charge transfer and elevated the electroconductivity. As-prepared WP@NC nanocomposites revealed enhanced electrocatalytic hydrogen evolution reaction (HER) activities in both of acidic and alkaline electrolytes with Tafel slopes of 73 and 85 mv/dec, respectively. Furthermore, WP@NC nanocomposites instead of noble metal co-catalysts were loaded on superior thin g-C3N4 nanosheets (CN) by thermal polymerization at different temperature. In the case of without Pt, the photocatalytic hydrogen generation rate of CN/WP@NC heterojunctions prepared using optimized conditions reached 1217.6 μmol g−1 h−1, which was ∼196 folds of pure g-C3N4 nanosheets. This is ascribed to that N-doped carbon layers on WP improved the separation and transfer efficiency of photogenerated charge carriers. Interestingly, the carbon layers improved the chemical stability and corrosion resistance to ensure enhanced photocatalytic hydrogen generation in simulated seawater. In addition, the sample revealed outstanding light-assisted elimination capability of 4-nitrophenol (4-NP) because of the selective hydrogenation reaction to 4-aminophenol and photodegradation reaction of 4-NP. Under visible light irradiation, the removal efficiency using CN/WP@NC reached 99% within 10 min. The kinetic constant (0.443 min−1) was 17.8 times of that of g-C3N4 nanosheets. This work supplied an efficient method to fabricate bi-functional noble-metal-free catalyst towards clean energy production and environment remediation.
- Record ID
- CUTf4c0b59837a342288b9047dab83084d5
- Publication categories
- ;
- Author
- Journal series
- Carbon, ISSN 0008-6223, e-ISSN 1873-3891
- Issue year
- 2023
- Vol
- 202
- No
- 1
- Pages
- 378-388
- Other elements of collation
- rys.; tab.; wykr.; Bibliografia (na s.) - 387-388; Bibliografia (liczba pozycji) - 50; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 202, Pt. 1
- Keywords in English
- g-C3N4, WPN-doped carbon layer, photocatalytic, hydrogenation
- ASJC Classification
- DOI
- DOI:10.1016/j.carbon.2022.11.008 Opening in a new tab
- URL
- https://www.sciencedirect.com/science/article/pii/S0008622322009277 Opening in a new tab
- Language
- eng (en) English
- Score (nominal)
- 140
- Score source
- journalList
- Score
- Publication indicators
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTf4c0b59837a342288b9047dab83084d5/
- URN
urn:pkr-prod:CUTf4c0b59837a342288b9047dab83084d5
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.