Cu2–xS–MoS2 Nano-Octahedra at the Atomic Scale: Using a Template To Activate the Basal Plane of MoS2 for Hydrogen Production

Maiti, Pradipta Sankar; Ganai, Anal Kr.; Bar‐Ziv, Ronen; Enyashin, Andrey N.; Houben, Lothar; Bar‐Sadan, Maya

doi:10.1021/acs.chemmater.8b01239

Cited by 49 publications

(38 citation statements)

References 23 publications

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“…This study focuses on M 0 ‐nanoparticles (M 0 ‐NPs). These processes include, for example, electrochemical processes, photochemical processes, catalytic reduction processes including reductions by BH 4 − , hydrogen atom transfer processes, water reduction by radicals, hydrogen splitting reactions, hydrogen spillover processes, hydrogen storage, etc. In aqueous media, the equilibrium reaction:

true (M^{0} - NP) - normalH + normalH_{2} normalO \vec{\leftarrow} (M^{0} - NP)^{-} + normalH_{3} normalO^{+}

…”

Section: Methodsmentioning

confidence: 99%

The Chemical Properties of Hydrogen Atoms Adsorbed on M⁰‐Nanoparticles Suspended in Aqueous Solutions: The Case of Ag⁰‐NPs and Au⁰‐NPs Reduced by BD₄⁻

et al. 2018

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The nature of H-atoms adsorbed on M 0 -nanoparticles is of major importance in many catalyzedr eduction processes.Using isotope labeling,wedetermined that hydrogen evolution from transient {(M 0 -NP)-H n } nÀ proceeds mainly via the Heyrovsky mechanism when nislarge (i.e., the hydrogens behave as hydrides) but mainly via the Tafel mechanism when niss mall (i.e., the hydrogens behave as atoms). Additionally, the relative contributions of the two mechanisms differ considerably for M = Au and Ag.T he results are analogous to those recently reported for the M 0 -NP-catalyzed de-halogenation processes.

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true (M^{0} - NP) - normalH + normalH_{2} normalO \vec{\leftarrow} (M^{0} - NP)^{-} + normalH_{3} normalO^{+}

…”

Section: Methodsmentioning

confidence: 99%

The Chemical Properties of Hydrogen Atoms Adsorbed on M⁰‐Nanoparticles Suspended in Aqueous Solutions: The Case of Ag⁰‐NPs and Au⁰‐NPs Reduced by BD₄⁻

et al. 2018

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“…Transition metal dichalcogenides (TMDs), such as molybdenum disulfide (MoS 2 ), Tungsten disulfide (WS 2 ), niobium disulphide (NbS 2 ), and Titanium disulfide (TiS 2 ), are typically used for catalysis, optical materials, energy storage, etc., considering their unique electronic properties and metallic characteristics. Due to its excellent mechanical strength and physicochemical properties, MoS 2 has sparked great attention as a promising and sustainable catalyst.…”

Section: Introductionmentioning

confidence: 99%

Edge‐Enriched Ultrathin MoS₂ Embedded Yolk‐Shell TiO₂ with Boosted Charge Transfer for Superior Photocatalytic H₂ Evolution

Wang

Zhu

Cao

et al. 2019

Adv Funct Materials

137

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Exploring TiO 2 -photocatalysts for sunlight conversion has high demand in artificial photosynthesis. In this work, edge-enriched ultrathin molybdenum disulfide (MoS 2 ) flakes are uniformly embedded into the bulk of yolk-shell TiO 2 as a cocatalyst to accelerate photogeneratedelectron transfer from the bulk to the surface of TiO 2 . The as-formed MoS 2 /TiO 2 (0.14 wt%) hybrids exhibit a high hydrogen evolution rate (HER) of 2443 μmol g −1 h −1 , about 1000% and 470% of that of pristine TiO 2 (247 μmol g −1 h −1 ) and bulk MoS 2 decorated TiO 2 (513 μmol g −1 h −1 ). Such a greatly enhanced HER is attributed to the exposed catalytic edges of the ultrathin MoS 2 flakes with a robust chemical linkage (TiS bond), providing rapid charge transfer channels between TiO 2 and MoS 2 . The catalytic stability is promoted by the antiaggregation of the highly dispersed MoS 2 flakes in the bulk of yolk-shell TiO 2 . The exponential fitted decay kinetics of time-resolved photoluminescence (ns-PL) spectra illustrates that embedding ultrathin MoS 2 flakes in TiO 2 effectively decreases the average lifetime of PL in the MoS 2 /TiO 2 hybrids (τ ave = 4.55 ns), faster than that of pristine TiO 2 (≈7.17 ns) and the bulk MoS 2 /TiO 2 (≈6.13 ns), allowing a superior charge separation and charge trapping process for reducing water.

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“…It is against this background that efforts are currently being dedicated to further modify the MoS2 structures with the aim of improving performance by increasing the density of their catalytic sites either by creating defects, [7][8][9] modifying the morphology or by doping with other transition metals. [2][3][10][11] Another approach is to combine MoS2 with other materials and produce hybrids with improved electrical conductivity, 12 more active basal planes, 13 or improved photocatalytic activity. [14][15] Recently, a study exploring the thickness dependence (number of layers) of MoS2 electrocatalysts showed a significant improvement in the catalytic activity for HER with decreasing number of layers.…”

Section: Introductionmentioning

confidence: 99%

Au-MoS₂ Hybrids as Hydrogen Evolution Electrocatalysts

Bar‐Ziv

Ranjan

Lavie

et al. 2019

ACS Appl. Energy Mater.

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Core-shell nanoparticles provide a unique morphology to exploit electronic interactions between dissimilar materials conferring them new or improved functionalities. MoS2 is a layered transitionmetal disulfide that has been studied extensively for the hydrogen evolution reaction (HER) but still suffers from low electrocatalytic activity due to its poor electronic conductivity. To understand the fundamental aspects of the MoS2-Au hybrids with regard to their electrocatalytic activity, a single to a few layers of MoS2 were deposited over Au nanoparticles via a versatile procedure that allows for complete encapsulation of Au nanoparticles of arbitrary geometries. High-resolution transmission electron microscopy of the Au@MoS2 nanoparticles provides direct evidence of the core-shell morphology and also reveals the presence of morphological defects and irregularities in the MoS2 shell that are known to be more active for HER than the pristine MoS2 basal plane.Electrochemical measurements show a significant improvement in the HER activity of Au@MoS2 nanoparticles relative to free-standing MoS2 or Au-decorated MoS2. The best electrochemical performance was demonstrated by the Au nanostars -the largest Au core employed hereencapsulated in an MoS2 shell. Density-functional theory calculations show that charge transfer occurs from the Au to the MoS2 layers, producing a more conductive catalyst layer and a better electrode for electrochemical HER. The strategies to further improve the catalytic properties of such hybrid nanoparticles are discussed.

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Cu_2–xS–MoS₂ Nano-Octahedra at the Atomic Scale: Using a Template To Activate the Basal Plane of MoS₂ for Hydrogen Production

Cited by 49 publications

References 23 publications

The Chemical Properties of Hydrogen Atoms Adsorbed on M⁰‐Nanoparticles Suspended in Aqueous Solutions: The Case of Ag⁰‐NPs and Au⁰‐NPs Reduced by BD₄⁻

The Chemical Properties of Hydrogen Atoms Adsorbed on M⁰‐Nanoparticles Suspended in Aqueous Solutions: The Case of Ag⁰‐NPs and Au⁰‐NPs Reduced by BD₄⁻

Edge‐Enriched Ultrathin MoS₂ Embedded Yolk‐Shell TiO₂ with Boosted Charge Transfer for Superior Photocatalytic H₂ Evolution

Au-MoS₂ Hybrids as Hydrogen Evolution Electrocatalysts

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Cu2–xS–MoS2 Nano-Octahedra at the Atomic Scale: Using a Template To Activate the Basal Plane of MoS2 for Hydrogen Production

Cited by 49 publications

References 23 publications

The Chemical Properties of Hydrogen Atoms Adsorbed on M0‐Nanoparticles Suspended in Aqueous Solutions: The Case of Ag0‐NPs and Au0‐NPs Reduced by BD4−

The Chemical Properties of Hydrogen Atoms Adsorbed on M0‐Nanoparticles Suspended in Aqueous Solutions: The Case of Ag0‐NPs and Au0‐NPs Reduced by BD4−

Edge‐Enriched Ultrathin MoS2 Embedded Yolk‐Shell TiO2 with Boosted Charge Transfer for Superior Photocatalytic H2 Evolution

Au-MoS2 Hybrids as Hydrogen Evolution Electrocatalysts

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Product

Resources

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Cu_2–xS–MoS₂ Nano-Octahedra at the Atomic Scale: Using a Template To Activate the Basal Plane of MoS₂ for Hydrogen Production

The Chemical Properties of Hydrogen Atoms Adsorbed on M⁰‐Nanoparticles Suspended in Aqueous Solutions: The Case of Ag⁰‐NPs and Au⁰‐NPs Reduced by BD₄⁻

The Chemical Properties of Hydrogen Atoms Adsorbed on M⁰‐Nanoparticles Suspended in Aqueous Solutions: The Case of Ag⁰‐NPs and Au⁰‐NPs Reduced by BD₄⁻

Edge‐Enriched Ultrathin MoS₂ Embedded Yolk‐Shell TiO₂ with Boosted Charge Transfer for Superior Photocatalytic H₂ Evolution

Au-MoS₂ Hybrids as Hydrogen Evolution Electrocatalysts