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author:

Sun, Wenhao (Sun, Wenhao.) [1] | Ahmed, Taha (Ahmed, Taha.) [2] | Elbouazzaoui, Kenza (Elbouazzaoui, Kenza.) [3] | Edvinsson, Tomas (Edvinsson, Tomas.) [4] | Zheng, Yuanhui (Zheng, Yuanhui.) [5] (Scholars:郑远辉) | Zhu, Jiefang (Zhu, Jiefang.) [6]

Indexed by:

EI Scopus SCIE

Abstract:

Constructing a Z-scheme heterojunction with enhanced photocatalytic hydrogen evolution for graphitic carbon nitride-based (g-C3N4) composites is challenging because integrating g-C3N4 with other semiconductors, without specific band structure design, typically results in type I or type II heterojunctions. These heterojunctions have lower redox ability and limited enhancement in photocatalysis. Herein, we select highly crystalline carbon nitride (HCCN) as a proof-of-concept substrate. For the first time, we develop a AgBr nanosphere/HCCN composite photocatalyst that features an all -solid -state direct Z-scheme heterojunction for visible-light photocatalytic hydrogen evolution. The electron transfer mechanism is initially studied from the band structures and Fermi levels of HCCN and AgBr. It is subsequently confirmed by X-ray photoelectron spectroscopy (XPS), and electron microscopy. The close heterojunction contact and the built-in electron field of the Z-scheme heterojunction promote the migration and separation of photogenerated electrons and holes in the composite photocatalyst. Due to the redistribution of charge carriers, the photocatalyst shows superior redox capability and a markedly enhanced hydrogen evolution performance compared to its individual components. Combining all the advantages, AgBr nanosphere/HCCN reached an apparent quantum efficiency (AQE) of 6 % under the illumination of 410 nm, which is 4 times higher than that of the single HCCN component.

Keyword:

AgBr nanosphere Highly crystalline carbon nitride Hydrogen production Photocatalysis Z-scheme heterojunction

Community:

  • [ 1 ] [Sun, Wenhao]Fuzhou Univ, Coll Chem, Fuzhou 350116, Peoples R China
  • [ 2 ] [Zheng, Yuanhui]Fuzhou Univ, Coll Chem, Fuzhou 350116, Peoples R China
  • [ 3 ] [Sun, Wenhao]Uppsala Univ, Dept Chem Angstrom, Angstrom Lab, SE-75121 Uppsala, Sweden
  • [ 4 ] [Ahmed, Taha]Uppsala Univ, Dept Chem Angstrom, Angstrom Lab, SE-75121 Uppsala, Sweden
  • [ 5 ] [Elbouazzaoui, Kenza]Uppsala Univ, Dept Chem Angstrom, Angstrom Lab, SE-75121 Uppsala, Sweden
  • [ 6 ] [Edvinsson, Tomas]Uppsala Univ, Dept Chem Angstrom, Angstrom Lab, SE-75121 Uppsala, Sweden
  • [ 7 ] [Zhu, Jiefang]Uppsala Univ, Dept Chem Angstrom, Angstrom Lab, SE-75121 Uppsala, Sweden
  • [ 8 ] [Edvinsson, Tomas]Uppsala Univ, Dept Mat Sci & Engn, Solid State Phys, Box 35, S-75103 Uppsala, Sweden
  • [ 9 ] [Edvinsson, Tomas]Newcastle Univ, Sch Nat & Environm Sci, Energy Mat Lab, Newcastle Upon Tyne NE1 7RU, England
  • [ 10 ] [Zheng, Yuanhui]Fuzhou Univ, Coll Phys & Informat Engn, Fuzhou 350116, Peoples R China
  • [ 11 ] [Zhu, Jiefang]East China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China

Reprint 's Address:

  • 郑远辉

    [Zheng, Yuanhui]Fuzhou Univ, Coll Chem, Fuzhou 350116, Peoples R China;;[Zhu, Jiefang]Uppsala Univ, Dept Chem Angstrom, Angstrom Lab, SE-75121 Uppsala, Sweden

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Source :

APPLIED SURFACE SCIENCE

ISSN: 0169-4332

Year: 2024

Volume: 651

6 . 3 0 0

JCR@2023

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count: 7

SCOPUS Cited Count: 7

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 7

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