Exploring the effects of crystal facet in Bi2WO6/BiOCl heterostructures on photocatalytic properties: A first-principles theoretical study

Sun, Hongqi; Tian, Zhixue; Zhou, Guoli; Zhang, Junmeng; Li, Pan

doi:10.1016/j.apsusc.2018.11.006

Cited by 60 publications

(17 citation statements)

References 36 publications

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“…Bi 2 WO 6 has suitable band edges (E CB = 0.03 eV, E VB = 2.93 eV) 20 , and can match well with BiOCl (E CB = − 0.80 eV, E VB = 1.09 eV) to form a heterostructure 13 . Additionally, both Bi 2 WO 6 and BiOCl belong to the layered Aurivillius family, consisting of [Bi 2 O 2 ] 2+ layers sandwiched between two slabs of [WO 4 ] 2− or Cl ions, which render them ready to match well with each other 21 , 22 .…”

Section: Introductionmentioning

confidence: 99%

Bi2WO6–BiOCl heterostructure with enhanced photocatalytic activity for efficient degradation of oxytetracycline

Guo

Zhou

Yan

et al. 2020

Sci Rep

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The application of BiOCl in photocatalysis has been restricted by its low utilization of solar energy and fast recombination of charge carriers. In this study, zero-dimensional (0D) Bi2WO6 nanoparticles/two-dimensional (2D) layered BiOCl heterojunction composite was successfully constructed by facile hydrothermal and solvothermal methods. The most favorable sunlight photocatalytic activity was achieved for the as-prepared Bi2WO6–BiOCl composites with a ratio of 1%. The photocatalytic rate and mineralization efficiency of one typical antibiotic (i.e., oxytetracycline) over 1% Bi2WO6–BiOCl was about 2.7 and 5.3 times as high as that of BiOCl. Both experimental characterizations and density functional theory (DFT) calculations confirmed that the excellent photocatalytic performance mainly arised from the effective charge separation along the Bi2WO6 and BiOCl heterojunction interface. The effective electron transfer was driven by the internal electric field at the interfacial junction. In addition, 1% Bi2WO6–BiOCl exhibited excellent stability, and no apparent deactivation was observed after 4 test cycles. Therefore, the 0D/2D Bi2WO6–BiOCl heterojunction showed a great potential for the photocatalytic degradation of emerging organic pollutants.

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Section: Introductionmentioning

confidence: 99%

Bi2WO6–BiOCl heterostructure with enhanced photocatalytic activity for efficient degradation of oxytetracycline

Guo

Zhou

Yan

et al. 2020

Sci Rep

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“…This result further confirms that type II heterojunction between the BiOBr0.5Cl0.5 and WO3 can be ruled out, and an S-scheme charge transfer route is involved. According to previous reports, the work functions of BiOBr and BiOCl are 5.86 and 5.78 eV, respectively, which are lower than that of WO3 (6.23 eV), indicating the electron transfer from BiOBr0.5Cl0.5 to WO3 thus constructing of internal electric fields from BiOBr0.5Cl0.5 to WO3 66,70,71 . Based on the fact that all the VB positions of BiOBr0.5Cl0.5 and WO3 are all positive enough to generate •OH, all these samples could generate •OH under light irradiation from Fig.…”

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confidence: 57%

Enhanced Photocatalytic CO2 Reduction over 2D/1D BiOBr0.5Cl0.5/WO3 S-scheme Heterostructure

Zhu¹,

Hong²,

Li-yong³

et al. 2021

Acta Physico Chimica Sinica

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Catalytic reduction of CO2 to CO has been considered promising for converting the greenhouse gas into chemical intermediates. Compared to other catalytic methods, photocatalytic CO2 reduction, which uses solar energy as the energy input, has attracted significant attention because it is a clean and inexhaustible resource. Therefore, using high-performance photocatalysts for effective CO2 reduction under mild reaction conditions is an active research hotspot. However, several current photocatalysts suffer from low solar energy conversion efficiency due to the extensive charge recombination and few active sites, leading to low CO2 reduction efficiency. Generally, constructing an S-scheme heterojunction can not only promote charge separation but also help maintain strong redox ability. Therefore, the S-scheme heterojunction is expected to help in achieving high conversion activity and CO2 reduction efficiency. Here, 2D tetragonal BiOBr0.5Cl0.5 nanosheets and hexagonal WO3 nanorods were prepared using a simple hydrothermal synthesis method, and the 2D/1D BiOBr0.5Cl0.5 nanosheets/WO3 nanorods (BiOBr0.5Cl0.5/WO3) S-scheme heterojunction with near infrared (NIR) light (> 780 nm) response were prepared via the electrostatic self-assembly method for the photocatalytic CO2 reduction. Following characterization and analysis, including diffuse reflectance spectra (DRS), Mott-Schottky plots, transient photocurrent response, time-resolution photoluminescence spectrum (TRPL), electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and electron spin resonance (ESR) measurements, it can be demonstrated that an S-scheme carrier transfer route was formed between the 2D BiOBr0.5Cl0.5 nanosheets and 1D WO3 nanorods. Driven by the internal electric field, which was formed between the two semiconductors, electron migration was boosted, thus inhibiting the recombination of photogenerated carriers, while the stronger redox ability was maintained, thus providing good reduction efficiency over BiOBr0.5Cl0.5/WO3 composite in CO2 reduction. In addition, the 2D/1D nanosheet/nanorod structure allowed for enhanced interface contact with abundant active sites, which favored charge separation and increased photocatalytic activity. Furthermore, the amount of WO3 nanorods added during the preparation of the composites was altered, which led to the optimal amount of 5% (w, mass fraction) for the photocatalytic CO2 reduction. As a result, the BiOBr0.5Cl0.5/WO3 composite exhibited superior photocatalytic reduction performance with a CO yield of 16.68 μmol•g −1 •h −1 in the presence of any precious metal cocatalyst or sacrificial agent, which was 1.7 and 9.8 times that of pure BiOBr0.5Cl0.5 and WO3, respectively. In addition, the BiOBr0.5Cl0.5/WO3 composite provided continuously increased CO yields with excellent selectivity under full-spectrum light irradiation, suggesting good photocatalytic stability. This work describes a novel idea for the construction of 2D/1D S-scheme heterojunction photocatalysts for efficient CO2 reduction.

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“…The work function values (difference between the vacuum and Fermi level) of the samples were obtained by referring to previous literature. 62,63 By taking into account the work function values 5.90 eV 62 and 4.18 eV 63 for Bi 2 WO 6 and pg-C 3 N 4 , respectively, the Fermi level ( E f ), valence band ( E VB ) and conduction band ( E CB ) were obtained and are presented in Table S3 (ESI†).…”

Section: Resultsmentioning

confidence: 99%

2D/2D Bi₂WO₆/Protonated g-C₃N₄ step-scheme heterojunctions for enhancing the photodegradation of 17β-estradiol: promotional role of electrostatic interaction

Qing

et al. 2022

New J. Chem.

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Exploring the effects of crystal facet in Bi2WO6/BiOCl heterostructures on photocatalytic properties: A first-principles theoretical study

Cited by 60 publications

References 36 publications

Bi2WO6–BiOCl heterostructure with enhanced photocatalytic activity for efficient degradation of oxytetracycline

Bi2WO6–BiOCl heterostructure with enhanced photocatalytic activity for efficient degradation of oxytetracycline

Enhanced Photocatalytic CO<sub>2</sub> Reduction over 2D/1D BiOBr<sub>0.5</sub>Cl<sub>0.5</sub>/WO<sub>3</sub> S-scheme Heterostructure

2D/2D Bi₂WO₆/Protonated g-C₃N₄ step-scheme heterojunctions for enhancing the photodegradation of 17β-estradiol: promotional role of electrostatic interaction

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Exploring the effects of crystal facet in Bi2WO6/BiOCl heterostructures on photocatalytic properties: A first-principles theoretical study

Cited by 60 publications

References 36 publications

Bi2WO6–BiOCl heterostructure with enhanced photocatalytic activity for efficient degradation of oxytetracycline

Bi2WO6–BiOCl heterostructure with enhanced photocatalytic activity for efficient degradation of oxytetracycline

Enhanced Photocatalytic CO<sub>2</sub> Reduction over 2D/1D BiOBr<sub>0.5</sub>Cl<sub>0.5</sub>/WO<sub>3</sub> S-scheme Heterostructure

2D/2D Bi2WO6/Protonated g-C3N4 step-scheme heterojunctions for enhancing the photodegradation of 17β-estradiol: promotional role of electrostatic interaction

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2D/2D Bi₂WO₆/Protonated g-C₃N₄ step-scheme heterojunctions for enhancing the photodegradation of 17β-estradiol: promotional role of electrostatic interaction