Atomic‐Scale Edge Structures on Industrial‐Style MoS<sub>2</sub> Nanocatalysts

Hansen, Lars P.; Ramasse, Quentin M.; Kisielowski, Christian; Brorson, Michael; Johnson, Erik; Topsøe, Henrik; Helveg, Stig

doi:10.1002/ange.201103745

Cited by 60 publications

(58 citation statements)

References 35 publications

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“…3a, b). Although the edge structure is difficult to be determined conclusively, there is evidently strong preference for zig-zag edge orientation, consistent with theoretical predictions 38,39 and experimentally observed structures, [39][40][41][42][43] suggesting that 50% S and 100% S saturated zigzag molybdenum-edges should be thermodynamically preferred. [43][44][45] The HRTEM images also show the presence of material at the edges, which may correspond to carbonaceous species.…”

Section: Discussionsupporting

confidence: 80%

“…4f), with the 50% S edge more stable over a wide range of S chemical potential. [40][41][42][43][44] These edges have been both observed experimentally and it has been shown that the edge configuration depends on the synthesis conditions. [40][41][42][43] Although further studies need to be done in order to fully unveil the processes occurring at these edges, some theoretical studies have already shown the possibility of their modification through adsorption and desorption processes.…”

Section: Discussionmentioning

confidence: 85%

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Functionalization of MoS2 with 1,2-dithiolanes: toward donor-acceptor nanohybrids for energy conversion

et al. 2017

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The covalent functionalization of exfoliated semiconducting MoS 2 by 1,2-dithiolanes bearing an ethylene glycol alkyl chain terminated to a butoxycarbonyl-protected amine and a photoactive pyrene moiety is accomplished. The MoS 2 -based nanohybrids were fully characterized by complementary spectroscopic, thermal, and microscopy techniques. Markedly, density functional theoretical studies combined with X-ray photoelectron spectroscopy analysis demonstrate preferential edge functionalization, primarily via sulfur addition along partially sulfur saturated zig-zag MoS 2 molybdenum-edges, preserving intact the 2D basal structure of functionalized MoS 2 -based nanohybrids as confirmed by high-resolution transmission electron microscopy and electron energy loss spectroscopy. Furthermore, in the MoS 2 -pyrene hybrid, appreciable electronic interactions at the excited state between the photoactive pyrene and the semiconducting MoS 2 were revealed as inferred by steady-state and time-resolved photoluminescence spectroscopy, implying its high potentiality to function in energy conversion schemes.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 85%

Functionalization of MoS2 with 1,2-dithiolanes: toward donor-acceptor nanohybrids for energy conversion

et al. 2017

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“…We also observed other point or line defects, but with much lower density. Great care was taken in TEM experiments to prevent knock-on damage or lattice reconstruction caused by 80 keV electron beam irradiation 28,29 . To rule out the effect of electron irradiation on vacancy density, we studied the evolution of defects under different exposure time.…”

Section: Resultsmentioning

confidence: 99%

“…S12). It is noteworthy that long-time electron irradiation at 80 kV could generate SVs due to knock-on damage 28,29 . Therefore, after we moved to an area, we limited the exposure time to o30 s (to adjust focus) before imaging.…”

Section: Methodsmentioning

confidence: 99%

Hopping transport through defect-induced localized states in molybdenum disulphide

et al. 2013

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Molybdenum disulphide is a novel two-dimensional semiconductor with potential applications in electronic and optoelectronic devices. However, the nature of charge transport in back-gated devices still remains elusive as they show much lower mobility than theoretical calculations and native n-type doping. Here we report a study of transport in few-layer molybdenum disulphide, together with transmission electron microscopy and density functional theory. We provide direct evidence that sulphur vacancies exist in molybdenum disulphide, introducing localized donor states inside the bandgap. Under low carrier densities, the transport exhibits nearest-neighbour hopping at high temperatures and variable-range hopping at low temperatures, which can be well explained under Mott formalism. We suggest that the low-carrier-density transport is dominated by hopping via these localized gap states. Our study reveals the important role of short-range surface defects in tailoring the properties and device applications of molybdenum disulphide.

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“…For each individual layer, MoS 2 prefers to expose two types of low index edge terminations: the (1010) S edge and the (1010) Mo edge, as shown in Figure 1b [33,40,41]. When the size becomes smaller, like the MoS 2 cluster synthesized on Au (111), a triangular shape feature can be observed (Figure 1c) [33].…”

Section: Edge Structures Of Mosmentioning

confidence: 97%

Two-Dimensional Material Molybdenum Disulfides as Electrocatalysts for Hydrogen Evolution

Yang

Liu

et al. 2017

Catalysts

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Abstract:Recently, transition metal dichalcogenides (TMDs), represented by MoS 2 , have been proven to be a fascinating new class of electrocatalysts in hydrogen evolution reaction (HER). The rich chemical activities, combined with several strategies to regulate its morphologies and electronic properties, make MoS 2 very attractive for understanding the fundamentals of electrocatalysis. In this review, recent developments in using MoS 2 as electrocatalysts for the HER with high activity are presented. The effects of edges on HER activities of MoS 2 are briefly discussed. Then we demonstrate strategies to further enhance the catalytic performance of MoS 2 by improving its conductivity or engineering its structure. Finally, the key challenges to the industrial application of MoS 2 in electrocatalytic hydrogen evolution are also pointed out.

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Atomic‐Scale Edge Structures on Industrial‐Style MoS₂ Nanocatalysts

Cited by 60 publications

References 35 publications

Functionalization of MoS2 with 1,2-dithiolanes: toward donor-acceptor nanohybrids for energy conversion

Functionalization of MoS2 with 1,2-dithiolanes: toward donor-acceptor nanohybrids for energy conversion

Hopping transport through defect-induced localized states in molybdenum disulphide

Two-Dimensional Material Molybdenum Disulfides as Electrocatalysts for Hydrogen Evolution

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Atomic‐Scale Edge Structures on Industrial‐Style MoS2 Nanocatalysts

Cited by 60 publications

References 35 publications

Functionalization of MoS2 with 1,2-dithiolanes: toward donor-acceptor nanohybrids for energy conversion

Functionalization of MoS2 with 1,2-dithiolanes: toward donor-acceptor nanohybrids for energy conversion

Hopping transport through defect-induced localized states in molybdenum disulphide

Two-Dimensional Material Molybdenum Disulfides as Electrocatalysts for Hydrogen Evolution

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Atomic‐Scale Edge Structures on Industrial‐Style MoS₂ Nanocatalysts