Z-scheme visible-light-driven Ag3PO4 nanoparticle@MoS2 quantum dot/few-layered MoS2 nanosheet heterostructures with high efficiency and stability for photocatalytic selective oxidation

Wan, Jun; Du, Xiaomin; Liu, Enzhou; Hu, Yang; Hu, Xiaoyun

doi:10.1016/j.jcat.2016.11.013

Cited by 157 publications

(49 citation statements)

References 89 publications

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“…[120] Similarly, the designed silver nanodisks were also prepared on WS 2 monolayers to achieve a large Rabi splitting (≈300 meV) at ambient conditions. [126] On the contrary, TMD nanosheets were grown on various nanostructures as well. [122] As indicated in Figure 8a, the conformational expansion of BSA on MoS 2 surface via their hydrophobic interaction induced the effective exfoliation of MoS 2 nanosheets under sonication, and this expansion also expose Au nanoclusters so as to facilitate their epitaxial growth into Au m nanoparticles (≈5 nm) on MoS 2 nanosheets (Figure 8b-d).…”

Section: Surface Hybridization With Other Nanostructuresmentioning

confidence: 99%

Functionalized Hybridization of 2D Nanomaterials

Guan

Han

2019

Advanced Science

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The discovery of graphene and subsequent verification of its unique properties have aroused great research interest to exploit diversified graphene‐analogous 2D nanomaterials with fascinating physicochemical properties. Through either physical or chemical doping, linkage, adsorption, and hybridization with other functional species into or onto them, more novel/improved properties are readily created to extend/expand their functionalities and further achieve great performance. Here, various functionalized hybridizations by using different types of 2D nanomaterials are overviewed systematically with emphasis on their interaction formats (e.g., in‐plane or inter plane), synergistic properties, and enhanced applications. As the most intensely investigated 2D materials in the post‐graphene era, transition metal dichalcogenide nanosheets are comprehensively investigated through their element doping, physical/chemical functionalization, and nanohybridization. Meanwhile, representative hybrids with more types of nanosheets are also presented to understand their unique surface structures and address the special requirements for better applications. More excitingly, the van der Waals heterostructures of diverse 2D materials are specifically summarized to add more functionality or flexibility into 2D material systems. Finally, the current research status and faced challenges are discussed properly and several perspectives are elaborately given to accelerate the rational fabrication of varied and talented 2D hybrids.

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Section: Surface Hybridization With Other Nanostructuresmentioning

confidence: 99%

Functionalized Hybridization of 2D Nanomaterials

Guan

Han

2019

Advanced Science

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“…The high resolution spectrum of Mo 3d is displayed in Figure 4D, the peaks at 226.7, 229.7, 232.9, and 236.2 eV can be ascribed to the S 2s, Mo 3d 5/2 , Mo 3d 3/2 , and Mo-O binding, respectively. Particularly, the first three binding energies indicated that S and Mo elements in the MoS 2 are found in the form of S 2− and Mo 4+ , respectively, and the last one might result from the exposed Mo atoms during the exfoliation process combining with the O of Ag 3 PO 4 (Wan et al, 2017). The S 2p XPS spectrum (Figure 4E) can be divided into two peaks centered at 162.5 and 163.6 eV, respectively, corresponding to the S 2p 3/2 and S 2p 1/2 in the MoS 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Where E CB and E VB represent the CB and VB edge potentials, respectively; χ is the electro-negativity of the semiconductor, which is the geometric mean of the electro-negativities of the constituent atoms, and χ-values for Ag 3 PO 4 and MoS 2 are 5.96 and 5.32 eV (Wan et al, 2017), respectively. E e is about 4.5 eV, representing the free electron energy on the hydrogen scale.…”

Section: Resultsmentioning

confidence: 99%

“…It was confirmed that the combination of MoS 2 with functional semiconductors enabled obvious enhancements in both photocatalytic and electrocatalytic hydrogen production activity (Sun et al, 2016; Zhang et al, 2016; Iqbal et al, 2017; Yuan et al, 2017). The hybridization of MoS 2 with Ag 3 PO 4 to produce MoS 2 /Ag 3 PO 4 composite materials has been primarily explored, however the application is restricted to the photodegradation of different kinds of organic pollutants (Wang L. et al, 2015; Wang P. F. et al, 2015; Gyawali and Lee, 2016; Li et al, 2016; Zhu et al, 2016; Wan et al, 2017), the employment of MoS 2 /Ag 3 PO 4 nanocomposites as photocatalysts for solar-light-driven oxygen evolution from water splitting has not yet been explored.…”

Section: Introductionmentioning

confidence: 99%

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Insights Into Highly Improved Solar-Driven Photocatalytic Oxygen Evolution Over Integrated Ag3PO4/MoS2 Heterostructures

et al. 2018

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Oxygen evolution has been considered as the rate-determining step in photocatalytic water splitting due to its sluggish four-electron half-reaction rate, the development of oxygen-evolving photocatalysts with well-defined morphologies and superior interfacial contact is highly important for achieving high-performance solar water splitting. Herein, we report the fabrication of Ag3PO4/MoS2 nanocomposites and, for the first time, their use in photocatalytic water splitting into oxygen under LED light illumination. Ag3PO4 nanoparticles were found to be anchored evenly on the surface of MoS2 nanosheets, confirming an efficient hybridization of two semiconductor materials. A maximum oxygen-generating rate of 201.6 μmol · L−1 · g−1 · h−1 was determined when 200 mg MoS2 nanosheets were incorporated into Ag3PO4 nanoparticles, which is around 5 times higher than that of bulk Ag3PO4. Obvious enhancements in light-harvesting property, as well as electron-hole separation and charge transportation are revealed by the combination of different characterizations. ESR analysis verified that more active oxygen-containing radicals generate over illuminated Ag3PO4/MoS2 composite photocatalysts rather than irradiated Ag3PO4. The improvement in oxygen evolution performance of Ag3PO4/MoS2 composite photocatalysts is ascribed to wide spectra response in the visible-light region, more efficient charge separation, and enhanced oxidation capacity in the valence band (VB). This study provides new insights into the design and development of novel composite photocatalytic materials for solar-to-fuel conversion.

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“…Furthermore, this method is highly dependent on the solvent. Thus far, N ‐methyl‐2‐pyrrolidone and other pyrrolidone‐based solvents have been found to be the most compatible solvents for MoS 2 exfoliation . These pyrrolidone‐based solvents are normally toxic and of high‐boiling points, which poses a severe environmental risk at the industrial scale.…”

Section: Introductionmentioning

confidence: 99%

Synergetic Exfoliation and Lateral Size Engineering of MoS₂ for Enhanced Photocatalytic Hydrogen Generation

Yin

Hai

Chang

et al. 2018

Small

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Generally, exfoliation is an efficient strategy to create more edge site so as to expose more active sites on molybdenum disulphide (MoS ). However, the lateral sizes of the resultant MoS monolayers are relatively large (≈50-500 nm), which retain great potential to release more active sites. To further enhance the catalytic performance of MoS , a facile cascade centrifugation-assisted liquid phase exfoliation method is introduced here to fabricate monolayer enriched MoS nanosheets with nanoscale lateral sizes. The as-prepared MoS revealed a high monolayer yield of 36% and small average lateral sizes ranging from 42 to 9 nm under gradient centrifugations, all exhibiting superior catalytic performances toward photocatalytic H generation. Particularly, the optimized monolayer MoS with an average lateral size of 9 nm achieves an apparent quantum efficiency as high as 77.2% on cadmium sulphide at 420 nm. This work demonstrates that the catalytic performances of MoS could be dramatically enhanced by synergistic exfoliation and lateral size engineering as a result of increased density of active sites and shortened charge diffusion distance, paving a new way for design and fabrication of transition-metal dichalcogenides-based materials in the application of hydrogen generation.

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Z-scheme visible-light-driven Ag3PO4 nanoparticle@MoS2 quantum dot/few-layered MoS2 nanosheet heterostructures with high efficiency and stability for photocatalytic selective oxidation

Cited by 157 publications

References 89 publications

Functionalized Hybridization of 2D Nanomaterials

Functionalized Hybridization of 2D Nanomaterials

Insights Into Highly Improved Solar-Driven Photocatalytic Oxygen Evolution Over Integrated Ag3PO4/MoS2 Heterostructures

Synergetic Exfoliation and Lateral Size Engineering of MoS₂ for Enhanced Photocatalytic Hydrogen Generation

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Z-scheme visible-light-driven Ag3PO4 nanoparticle@MoS2 quantum dot/few-layered MoS2 nanosheet heterostructures with high efficiency and stability for photocatalytic selective oxidation

Cited by 157 publications

References 89 publications

Functionalized Hybridization of 2D Nanomaterials

Functionalized Hybridization of 2D Nanomaterials

Insights Into Highly Improved Solar-Driven Photocatalytic Oxygen Evolution Over Integrated Ag3PO4/MoS2 Heterostructures

Synergetic Exfoliation and Lateral Size Engineering of MoS2 for Enhanced Photocatalytic Hydrogen Generation

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Synergetic Exfoliation and Lateral Size Engineering of MoS₂ for Enhanced Photocatalytic Hydrogen Generation