Molybdenum sulfide/graphene-carbon nanotube nanocomposite material for electrocatalytic applications in hydrogen evolution reactions

Khan, Majid; Yousaf, Ammar Bin; Chen, Mingming; Wei, Chengsha; Wu, Xibo; Huang, Ningdong; Qi, Zemin; Li, Liangbin

doi:10.1007/s12274-015-0963-z

Cited by 98 publications

(50 citation statements)

References 51 publications

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“…The resulting dispersion was filtered‐off using a PVDF membrane and a clear transparent solution was obtained. MoS 2 in bulk form was synthesized through our previously reported method . Details about the synthesis procedure of this study are reported in the Supplementary Information.…”

Section: Resultsmentioning

confidence: 99%

Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures

Khan

2019

ChemistrySelect

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In this work, a facile chemical route is presented to prepare photoluminescent MoS2 quantum dots (QDs) and nanosheets (NSs) on a large‐scale. The strategy involves probe‐type sonication of bulk MoS2 sheets in ethanol/water mixture followed by refluxing in dimethylformamide (DMF) solution. This preparation route makes cleavage of the Van‐der‐Waal layers possible by exfoliation across the 2D planes and the complete breakup of bulk MoS2 sheets around the defects and edges. The as‐prepared MoS2 QDs and NSs exhibit size quantization effects in their optical absorption and emission spectra. The resultant MoS2 NSs consist of few layers with lateral size around ∼80 nm and exhibit excitation dependent blue emission. Whereas, most of the MoS2 QDs were measured around ∼4.8 nm in lateral size and showed distinct green emission upon excitation. This may be attributed to a combined contribution from the increase in the quantum‐sized core, edge defects, dangling bonds, and surface states recombination. The study thus provides a simple pathway for the preparation of monolayer QDs and few‐layer NSs of transition‐metal‐dichalcogenides (TMD) or other layered materials.

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Section: Resultsmentioning

confidence: 99%

Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures

Khan

2019

ChemistrySelect

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“…First GO–CNTs were combined to form microstructures via π–π interaction, then later MoS 2 was grown on it hydrothermally. These electrodes showed superior performance for HER, with a low onset potential of only 35 mV, a Tafel slope of 38 mV dec −1 , and an apparent exchange current density of 74.25 mA cm −2 . Nitrogen‐doped r‐GO was coupled with MoS 2 nanosheets to check hydrogen electrocatalytic activity.…”

Section: Applications Of Mos2 For Energy Conversion and Storagementioning

confidence: 99%

Molybdenum Disulphide Heterointerfaces as Potential Materials for Solar Cells, Energy Storage, and Hydrogen Evolution

Naik

Rabinal

2020

Energy Tech

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Molybdenum disulphide (MoS2), an ideal semiconductor, belongs to the group of 40 well‐identified transition metal dichalcogenides. These have unique chemical bonding; in an ideal case they do not feature dangling bonds and hence possess a layered‐like atomic structure, such that strong intraplane and weak interplane bondings exist. Hence, MoS2 can be peeled into a precisely controlled number of layers; the bulk with Eg = 1.2 eV can be reduced to a unit cell‐thick layer (monolayer) with Eg = 1.89 eV. However, in reality, both bulk and monolayers possess many types of atomic defects associated with in‐plane, edge, grain boundaries, etc. As a result, MoS2 exhibits many interesting and tunable optoelectronic properties suitable for a wide range of applications. Interestingly, its basic polyhedral form (MoS6) undergoes a structural change that leads to many polymorphic phases, the three in bulk and the five in monolayer. Theoretical predictions and experimental observations clearly confirm that MoS2 and its interfaces with other materials can be significantly important for energy conversion and storage applications, which are emerging and critically important topics of modern science and society. This Review provides an overview of the past few years of research and developments on these topics.

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“…Among the various HER catalysts investigated till date, platinum is widely considered as the most appealing candidate owing to its small Tafel slope (30 mV/dec) and high i 0 (10 −2 A/cm 2 ) . Other electro‐catalysts like metal chalcogenides, phosphides, carbides and borides (MoS 2 , Mo 2 C, WS 2 , WP 2 , CoSe 2 , CoB, Co 2 B, Ni 2 P, NiSe etc) appear in the next place after noble metals like Pt, Rh, Ru etc . The other types of catalysts are mainly the carbon based materials like g‐C 3 N 4 , graphene and its derivatives .…”

Section: Figurementioning

confidence: 99%

“…Thus synthesized c‐GQD opens up new prospects in the field of catalysis for graphene based material. The higher i 0 , low η for c‐GQDs (220 mV) is comparable with the popular MoS 2 nanosheets (210 mV), MoS 2 ‐GQDs system (200 mV) MoS 2 nanosheets with carbon fiber support (245 mV) . In addition to that, the durability of the catalyst makes this material a promising candidate for HER to provide hydrogen fuel in a very pure form.…”

Section: Figurementioning

confidence: 99%

Unraveling the Hydrogen Evolution Reaction Active Sites in N‐Functionalized Interconnected Graphene Quantum Dots

et al. 2017

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Herein, we report for the first time, a unique three‐ dimensionally (3‐D) interconnected and surface N functionalized (25%) graphene quantum dots (c‐GQDs), which has been designed by a simple hydrazine hydrate treatment of GQDs in acidic condition at low temperature followed by a heat treatment that has remarkably enhanced electrocatalytic activity. A comparable exchange current density (i0: 0.8×10−3 A/cm2) with respect to the Pt/C and a low overpotential (220 mV; η10mA/cm2) has been observed for c‐GQDs. The improved performance of the material is attributed to the unique structure of the N‐interlinkage among the individual GQDs where the pyridinic‐N‐oxide develops electron rich active sites in the carbon framework for favourable H+ adsorption and desorption. We hope that our study may build up a new platform to the graphene based materials for various energy applications.

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Molybdenum sulfide/graphene-carbon nanotube nanocomposite material for electrocatalytic applications in hydrogen evolution reactions

Cited by 98 publications

References 51 publications

Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures

Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures

Molybdenum Disulphide Heterointerfaces as Potential Materials for Solar Cells, Energy Storage, and Hydrogen Evolution

Unraveling the Hydrogen Evolution Reaction Active Sites in N‐Functionalized Interconnected Graphene Quantum Dots

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Molybdenum sulfide/graphene-carbon nanotube nanocomposite material for electrocatalytic applications in hydrogen evolution reactions

Cited by 98 publications

References 51 publications

Size‐Dependent Quantization Effect in Optical Properties of MoS2 Nanostructures

Size‐Dependent Quantization Effect in Optical Properties of MoS2 Nanostructures

Molybdenum Disulphide Heterointerfaces as Potential Materials for Solar Cells, Energy Storage, and Hydrogen Evolution

Unraveling the Hydrogen Evolution Reaction Active Sites in N‐Functionalized Interconnected Graphene Quantum Dots

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Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures

Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures