Basic properties and photo-generated carrier dynamics of bismuth vanadate composites modified with CQDs, MWCNTs and rGO

Luo, Yujie; Sun, Yuxin; Gu, Xiaosong; Yan, Qiutong; Ji, Fangying; Xuan, Xiaopeng

doi:10.1016/j.colsurfa.2019.123678

Cited by 9 publications

(4 citation statements)

References 62 publications

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“…The fast decay time (τ 1 ) was originated from the radiative emission of direct interband exciton recombination, which generally occurs in bulk recombination. 46 The decay time (τ 1 ) of 3% MoS 2 /CdS is longer than that of CdS, indicating that the recombination rate of photogenerated electrons and holes is inhibited after combining MoS 2 . The decay time (τ 2 ) was assigned to the indirect recombination (reaction with other substances) of trapped electrons and holes.…”

Section: Resultsmentioning

confidence: 98%

“…This is further confirmed by TR PL results (shown in Figure d). The PL data were fitted using a double-exponential model using eq , and the average PL lifetimes were calculated according to eq . , where I ( t ) is the intensity of PL signals, A 1 and A 2 are the corresponding magnitudes, and τ 1 , τ 2 , and τ A are PL lifetimes. The fast decay time (τ 1 ) was originated from the radiative emission of direct interband exciton recombination, which generally occurs in bulk recombination .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The PL data were fitted using a double-exponential model using eq , and the average PL lifetimes were calculated according to eq . , where I ( t ) is the intensity of PL signals, A 1 and A 2 are the corresponding magnitudes, and τ 1 , τ 2 , and τ A are PL lifetimes. The fast decay time (τ 1 ) was originated from the radiative emission of direct interband exciton recombination, which generally occurs in bulk recombination . The decay time (τ 1 ) of 3% MoS 2 /CdS is longer than that of CdS, indicating that the recombination rate of photogenerated electrons and holes is inhibited after combining MoS 2 .…”

Section: Results and Discussionmentioning

confidence: 99%

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Sulfur Vacancy-Mediated Electron–Hole Separation at MoS₂/CdS Heterojunctions for Boosting Photocatalytic N₂ Reduction

Zheng

Han

Liu

et al. 2022

ACS Appl. Energy Mater.

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Defect engineering is considered as an efficient method for improving the photocatalytic activity of semiconductor photocatalysis because defects can not only serve as trapping centers for electrons and holes but also work as active sites for reaction. Herein, we synthesized a series of MoS2/CdS heterojunctions with abundant sulfur vacancies and used for photocatalytic N2 reduction. The sulfur vacancies at MoS2/CdS heterojunctions were confirmed by UV–vis diffuse-reflectance spectroscopy (UV-DRS) and electron paramagnetic resonance. The charge transfer behaviors of the photocatalysts were characterized by X-ray photoelectron spectroscopy, transient photocurrent, steady and transient photoluminescence spectroscopy, and so forth. Under visible light irradiation for 4 h, the production of NH3 at 3% MoS2/CdS heterojunctions (249.7 mg L–1 g–1) was about 5.4 and 3.9 times higher than that of pure MoS2 (45.9 mg L–1 g–1) and pristine CdS (64.5 mg L–1 g–1), respectively. The reaction mechanisms and pathways were further studied by in situ diffuse reflection infrared Fourier transform spectroscopy.

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Section: Resultsmentioning

confidence: 98%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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Sulfur Vacancy-Mediated Electron–Hole Separation at MoS₂/CdS Heterojunctions for Boosting Photocatalytic N₂ Reduction

Zheng

Han

Liu

et al. 2022

ACS Appl. Energy Mater.

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“…Three different sizes of carbon material composite photocatalysts: BiVO 4 /CDs, BiVO 4 /rGO, and BiVO 4 /multi-walled carbon nanotubes (MWCNTs) were successfully prepared by Luo et al [31] A series of research results show that the conductivity of carbon materials plays an important role in the separation of photogenerated carriers in Figure 5, that is, it promotes the separation and transfer of injected electrons, and the carrier fluorescence lifetime is in the range of 3-6 ns. The photocatalytic degradation rate is significantly accelerated.…”

Section: Separation and Transfer Of Charger Carriermentioning

confidence: 99%

Introduction to the Performance and Mechanism of Various Photocatalytic Materials Compounded with Carbon Dots

Yan

Wang

Zang

et al. 2021

Part & Part Syst Charact

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extensive research in the fields of drug delivery, chemical sensing, bioimaging, and specifically catalysis. [7][8][9] For instance, Liu's group has prepared CDs-confined CoP-CoO nanoheterostructure, Ru@CDs, RuM/CDs (M = Ni, Mn, Cu), and RuCo/ CDs catalysts with excellent catalytic performance, which can be widely used for electrolysis of hydrogen. [10][11][12][13] Catalysis, especially photocatalysis, is a topic that has received a lot of attention recently. Conventional photocatalysts include titanium dioxide, zinc oxide, and cadmium sulfide and many other oxide sulfide semiconductors, but these catalysts are basically limited in their use by low light utilization and high lightinduced electron-hole complexation rates. [14,15] As functional nanomaterials with excellent optical and electronic properties such as efficient light harvesting, extraordinary UCPL, and excellent photoinduced electron transfer, CDs combined with photocatalysts can broaden the photoresponsive region and improve the separation ratio of photoinduced carriers. [16,17] CDs are therefore considered to be an effective component for the construction of high-performance photocatalysts, and this area has been extensively investigated by researchers. CDs/Bi 2 MoO 6 composite photocatalysts were prepared by Samanta et al. [18] CDs led to an increase in catalyst light absorption and carrier separation efficiency. Zha et al. [19] synthesized a photocatalyst CDs/BiOCl using Chlorella vulgaris as a carbon source for CDs (CBOC). The introduced CDs broadened the response range of the spectrum, promoted the separation of electron-hole pairs, and enhanced the photocatalytic efficiency.The photocatalytic mechanism of CDs can be the photoexcitation and charge separation of the core carbon. [20] In general, the photocatalytic process based on CDs is divided into the following three processes. First, the absorption of light leads to the generation of electron-hole pairs. Second, the separation and transfer of electron-hole pairs create prerequisites for the reaction. Finally, a redox reaction takes place on the photocatalytic surface. [21] The main factors limiting the photocatalytic process are light absorption and the rate of electron-hole pair complexation, and many approaches have been taken to alleviate these problems.In view of the excellent performance of CDs in photocatalysis, previous reviews have summarized the approaches to improve the photocatalytic efficiency of CDs and the applications of CDs-based photocatalytic materials. [22][23][24][25][26] However, this thesis provides a review of the recent literature in this With their unique optical and electronic properties, carbon dots (CDs) are showing great momentum in many fields such as biosensing, imaging, drug delivery, and photocatalysis. Due to their efficient light harvesting, extraordinary upconversion photoluminescence, and excellent photoinduced electron transfer capabilities, the combination of CDs with photocatalytic materials will promote light absorption resulting in increased generation...

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Difference between ammonia and urea on nitrogen doping of graphene quantum dots

Zhu

Yan

et al. 2021

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Basic properties and photo-generated carrier dynamics of bismuth vanadate composites modified with CQDs, MWCNTs and rGO

Cited by 9 publications

References 62 publications

Sulfur Vacancy-Mediated Electron–Hole Separation at MoS₂/CdS Heterojunctions for Boosting Photocatalytic N₂ Reduction

Sulfur Vacancy-Mediated Electron–Hole Separation at MoS₂/CdS Heterojunctions for Boosting Photocatalytic N₂ Reduction

Introduction to the Performance and Mechanism of Various Photocatalytic Materials Compounded with Carbon Dots

Difference between ammonia and urea on nitrogen doping of graphene quantum dots

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Basic properties and photo-generated carrier dynamics of bismuth vanadate composites modified with CQDs, MWCNTs and rGO

Cited by 9 publications

References 62 publications

Sulfur Vacancy-Mediated Electron–Hole Separation at MoS2/CdS Heterojunctions for Boosting Photocatalytic N2 Reduction

Sulfur Vacancy-Mediated Electron–Hole Separation at MoS2/CdS Heterojunctions for Boosting Photocatalytic N2 Reduction

Introduction to the Performance and Mechanism of Various Photocatalytic Materials Compounded with Carbon Dots

Difference between ammonia and urea on nitrogen doping of graphene quantum dots

Contact Info

Product

Resources

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Sulfur Vacancy-Mediated Electron–Hole Separation at MoS₂/CdS Heterojunctions for Boosting Photocatalytic N₂ Reduction

Sulfur Vacancy-Mediated Electron–Hole Separation at MoS₂/CdS Heterojunctions for Boosting Photocatalytic N₂ Reduction