2D layered g-C3N4/WO3/WS2 S-scheme heterojunctions with enhanced photochemical performance
Authors:
- Tong Song,
- Cong Xie,
- Katarzyna Matras-Postolek,
- Ping Yang
Abstract
Graphitic carbon nitride (g-C3N4)/WO3/WS2 ternary heterojunctions were fabricated for the first time via in situ growing WO3 and WS2 on superior thin g-C3N4 nanosheets. A mechanic chemical prereaction plays an important role in the formation of S-scheme heterojunctions. Namely, the heterostructured photocatalyst prepared by optimized preparation conditions revealed enhanced photodegrading activity (∼8.6 times of pure g-C3N4) for organic pollutants in the visible light region. Compared with g-C3N4 nanosheets, the rate of hydrogen generation increased to ∼7.8 times higher, in which the apparent quantum efficiency at 420 nm reached 8.9%. Particularly, the as-prepared ternary photocatalyst exhibited a hydrogen generation rate of 29 μmol g–1 h–1 even without Pt loaded. The matched energy band structure, band bending effect, and intimate interface contact of the 2D/2D g-C3N4/WO3 heterojunction together determined the S-scheme electron transfer path. Photogenerated electrons and holes with high redox capacities were reserved to participate in the photocatalytic process. In addition, the oxygen vacancies and WS2 improved light response and further promoted the separation of charge carriers. This result offered a new idea for the construction of metal-free photocatalysts to be applied in the photochemistry field.
- Record ID
- CUTf56490676a33416a9e3b22d6e604bda0
- Publication categories
- ;
- Author
- Journal series
- The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, ISSN 1932-7447, e-ISSN 1932-7455
- Issue year
- 2021
- Vol
- 125
- No
- 35
- Pages
- 19382-19393
- Other elements of collation
- fot.; schem.; tab.; wykr.; Bibliografia (na s.) - 19392-19393; Bibliografia (liczba pozycji) - 40; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 125, Iss. 35
- Keywords in English
- graphitic carbon nitride, composites, photochemical
- DOI
- DOI:10.1021/acs.jpcc.1c06753 Opening in a new tab
- URL
- https://pubs.acs.org/doi/10.1021/acs.jpcc.1c06753 Opening in a new tab
- Language
- eng (en) English
- Score (nominal)
- 140
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTf56490676a33416a9e3b22d6e604bda0/
- URN
urn:pkr-prod:CUTf56490676a33416a9e3b22d6e604bda0
* 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.