Promoting photocarriers separation in S-scheme system with Ni2P electron bridge: The case study of BiOBr/Ni2P/g-C3N4

doi:10.1016/S1872-2067(21)63817-2

Abstract

Abstract:

Constructing step-scheme (S-scheme) heterojunctions can considerably facilitate separation and transfer of photocarriers, as well as promote strong redox ability. The interface resistance of heterojunctions immediately affects photocarrier separation and determines the photocatalytic activity. Herein, we constructed a novel BiOBr/Ni₂P/g-C₃N₄ heterojunction using Ni₂P as a novel electron bridge to reduce the interfacial resistance of photocarriers between BiOBr and g-C₃N₄. The as-prepared 10% BiOBr/Ni₂P/g-C₃N₄ sample exhibited outstanding visible-light photocatalytic performance for methyl orange and rhodamine B removal, with degradation efficiencies of 91.4% and 98.9%, respectively. The excellent photocatalytic activity of BiOBr/Ni₂P/g-C₃N₄ was mainly attributed to the synergistic effects of the Ni₂P cocatalyst and S-scheme heterojunction, which not only reduced the interface resistance but also retained the strong redox potential of the photocarriers. In addition, the formation of the S-scheme system was supported by active oxygen species investigation, current-voltage curves, and density functional theory calculations. This work provides a guideline for the design of highly efficient S-scheme photocatalysts with transition metal phosphates as electron bridges to improve photocarriers separation.

Key words: BiOBr/Ni₂P/g-C₃N₄, S-scheme, Interfacial electron transfer, Electron-bridge, Photocatalysis

Nannan Chen, Xuemei Jia, Heng He, Haili Lin, Minna Guo, Jing Cao, Jinfeng Zhang, Shifu Chen. Promoting photocarriers separation in S-scheme system with Ni₂P electron bridge: The case study of BiOBr/Ni₂P/g-C₃N₄[J]. Chinese Journal of Catalysis, 2022, 43(2): 276-287.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63817-2

https://www.cjcatal.com/EN/Y2022/V43/I2/276

Figures/Tables 10

Fig. 1. XRD patterns of g-C3N4, BiOBr, Ni2P, Ni2P/g-C3N4, BiOBr/g-C3N4, and BNC composites.

Fig. 2. XPS spectra of 10% BNC composite and reference samples. (a) Survey spectra; (b) C 1s; (c) N 1s; (d) O 1s; (e) Ni 2p; (f) P 2p; (g) Bi 4f; (h) Br 3d.

Fig. 3. SEM images of g-C3N4 (a), BiOBr (b), Ni2P (c), and 10% BNC (d); TEM (e) and HRTEM (f) images of the 10% BNC composite; (g) TEM and STEM-EDX elemental mapping for the 10% BNC composite: C, Ni, N, P, Bi, O, and Br.

Fig. 4. N2 adsorption-desorption isotherms (a) and pore size distribution (b) of g-C3N4, BiOBr, Ni2P, Ni2P/g-C3N4, 10% BiOBr/g-C3N4, and BNC composites.

Fig. 5. (a) UV-vis diffuse reflectance spectra of as-prepared samples; the corresponding band gap energies (b,c), Mott-Schottky curves (d,e) of g-C3N4 and BiOBr.

Fig. 6. Photocatalytic activities (a,c), and the corresponding reaction rate constants kapp (b,d) for the as-obtained photocatalysts for MO (a,b) and RhB (c,d) degradation under visible light (λ ≥ 400 nm) irradiation.

Fig. 7. Recycling test of 10% BNC for the degradation of MO under visible light (λ ≥ 400 nm) irradiation.

Fig. 8. EIS (a), TPR (b), PL (c), and TRPL (d) spectra of g-C3N4, Ni2P/g-C3N4, 10% BiOBr/g-C3N4, 10% BNC, BiOBr, and Ni2P.

Fig. 9. (a) Trapping experiment of active species; EPR responses of the DMPO-•O2- (b) and DMPO-•OH (c) spin adducts over 10% BNC; (d) Current-voltage curves of g-C3N4 and BiOBr under visible light (λ ≥ 400 nm) irradiation.

Fig. 10. The work functions of BiOBr (a), Ni2P (b), and g-C3N4 (c), and insets showing the corresponding calculation model. Schematic illustration of heterostructures: (d) before contact, (e) after contact in darkness, and (f) photogenerated charge carrier transfer process in S-scheme heterojunction under illumination.

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Promoting photocarriers separation in S-scheme system with Ni₂P electron bridge: The case study of BiOBr/Ni₂P/g-C₃N₄

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