Designing Z-scheme CdS/WS2 heterojunctions with enhanced photocatalytic degradation of organic dyes and photoreduction of Cr (VI): Experiments, DFT calculations and mechanism

Wang, Guohui; Dou, Kai; Cao, Haopeng; Du, Rongxiao; Liu, Jialong; Tsidaeva, Natalia; Wang, Wei

doi:10.1016/j.seppur.2022.120976

Cited by 54 publications

(15 citation statements)

References 72 publications

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“…The theoretical bandgap values calculated by Cu 2 WS 4 and CdS are 1.573 eV and 1.182 eV, which are the same as the previously reported studies (Fig. 9(b) and (e)) 45,46. Cu 2 WS 4 is one of the indirect bandgap semiconductors, with the CB and the VB located at the G and M points, respectively.…”

supporting

confidence: 87%

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Activating the (101) facets of Cu₂WS₄ in the CdS/Cu₂WS₄ S-scheme heterojunction to enhance the photocatalytic hydrogen evolution activity

Wang,

Jin

2023

J. Mater. Chem. C

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supporting

confidence: 87%

“…9(b) and (e)). 45,46 Cu 2 WS 4 is one of the indirect bandgap semiconductors, with the CB and the VB located at the G and M points, respectively. And CdS is a direct bandgap semiconductor, with both conduction and valence bands located at the G point.…”

Section: Resultsmentioning

confidence: 99%

Activating the (101) facets of Cu₂WS₄ in the CdS/Cu₂WS₄ S-scheme heterojunction to enhance the photocatalytic hydrogen evolution activity

Wang,

Jin

2023

J. Mater. Chem. C

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“…For instance, theoretical simulations found that the CdS/WS 2 composite with a tunable composition ratio has almost no bandgap compared to pure CdS and WS 2 , owing to the hybridization phenomenon of Cd 5s, W 5d, and S 2p orbitals. [ 152 ] Such a situation provides superior electrical conductivity for electron transfer from CdS to WS 2 , thereby contributing to the rapid decomposition of organic pollutants.…”

Section: Emerging Issues and Design Principlesmentioning

confidence: 99%

Recent Progress of Metal Sulfide Photocatalysts for Solar Energy Conversion

et al. 2022

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Figure 5. a,b) Density of state distributions of CdS (a) and CdS-P (b). c) Room-temperature time-resolved photoluminescence (TRPL) decay curves of samples in acetone. d) Schematic energy levels and variations in the Fermi levels of CdS and CdS-P. a-d) Reproduced with permission. [120] Copyright 2017, Wiley-VCH. e-g) Potential energy diagram of photocatalytic water splitting with corresponding depictions of transition-state structures on pristine ZnS and ZnS with vacancy defects. h) Proposed mechanism of M-ZnS with rich surface vacancy defects. e-h) Reproduced with permission. [121] Copyright 2021, American Chemical Society. i) Potentiostatic curves of samples. j) Digital images of as-prepared samples taken at different visible-light irradiation times. k,l) Potential barrier of an O 2 molecule (k) and an H 2 O molecule (l) through defective graphene. i-l) Reproduced with permission. [116]

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“…Figure a shows the optical absorption spectra of WS 2 , CdS, and their CdS/WS 2 composites. The absorption edge of WS 2 and CdS appear near 320 and 500 nm, respectively, indicating that the pristine crystal structures were maintained. , Compared with the pure CdS phase, the optical absorption peaks of the CdS/WS 2 composite show a slight red shift, which can be attributed to agglomeration caused by the relative weight changes in the CdS/WS 2 composites . With the increase of the WS 2 content, the absorption peak intensities of the composite samples increased, possibly due to the interaction of CdS and WS 2 in the composites …”

Section: Resultsmentioning

confidence: 99%

Moisture-Resistant and Highly Selective NH₃ Sensor Based on CdS/WS₂ Composite Heterojunction

Zhang

Wang

et al. 2023

Langmuir

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This study reports the synthesis of CdS/WS2 composites via a green and ultra-low-cost hydrothermal method. By controlling the relative mass ratio between WS2 and CdS, an n–n type CdS/WS2 heterostructure, with excellent NH3 gas-sensitive properties, was developed and investigated at room temperature. Compared with pristine WS2 and CdS, the CdS/WS2-40%wt composite exhibited excellent selectivity of more than 4 orders of magnitude for sensing NH3, a very short recovery time of 3 s, and ultrahigh selectivity at room temperature. The large specific surface area of the CdS/WS2 composite increased the active sites for the gas-sensitive reaction. Additionally, the 2D morphology of CdS/WS2 and the heterojunction formed between WS2 and CdS contributed to the improved performance. Anti-humidity interference tests showed that the CdS/WS2 sample remained stable under real-time monitoring of NH3 at different ambient humidity values. This study paves the way for designing high-performance gas sensors operating at room temperature.

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Designing Z-scheme CdS/WS2 heterojunctions with enhanced photocatalytic degradation of organic dyes and photoreduction of Cr (VI): Experiments, DFT calculations and mechanism

Cited by 54 publications

References 72 publications

Activating the (101) facets of Cu₂WS₄ in the CdS/Cu₂WS₄ S-scheme heterojunction to enhance the photocatalytic hydrogen evolution activity

Activating the (101) facets of Cu₂WS₄ in the CdS/Cu₂WS₄ S-scheme heterojunction to enhance the photocatalytic hydrogen evolution activity

Recent Progress of Metal Sulfide Photocatalysts for Solar Energy Conversion

Moisture-Resistant and Highly Selective NH₃ Sensor Based on CdS/WS₂ Composite Heterojunction

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Designing Z-scheme CdS/WS2 heterojunctions with enhanced photocatalytic degradation of organic dyes and photoreduction of Cr (VI): Experiments, DFT calculations and mechanism

Cited by 54 publications

References 72 publications

Activating the (101) facets of Cu2WS4 in the CdS/Cu2WS4 S-scheme heterojunction to enhance the photocatalytic hydrogen evolution activity

Activating the (101) facets of Cu2WS4 in the CdS/Cu2WS4 S-scheme heterojunction to enhance the photocatalytic hydrogen evolution activity

Recent Progress of Metal Sulfide Photocatalysts for Solar Energy Conversion

Moisture-Resistant and Highly Selective NH3 Sensor Based on CdS/WS2 Composite Heterojunction

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Product

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Activating the (101) facets of Cu₂WS₄ in the CdS/Cu₂WS₄ S-scheme heterojunction to enhance the photocatalytic hydrogen evolution activity

Activating the (101) facets of Cu₂WS₄ in the CdS/Cu₂WS₄ S-scheme heterojunction to enhance the photocatalytic hydrogen evolution activity

Moisture-Resistant and Highly Selective NH₃ Sensor Based on CdS/WS₂ Composite Heterojunction