Synthesis of MoS2 nanoparticles embedded, N, S co-doped mesoporous carbon via molten salt method as hydrogen evolution electrocatalyst under alkaline and neutral conditions

Zhang, Wenting; Yu, Huan; Tang, Duihai; Huang, Yuan; Wang, Jianjun; Yang, Linjiao; Zhao, Zhen

doi:10.1016/j.ijhydene.2021.01.188

Cited by 10 publications

(6 citation statements)

References 54 publications

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“…ZnO and 2.5MM heterostructure exhibited nominal HER activity, whereas the 5MM heterostructure showed a relatively higher current density, which infers that the pronounced effect of 5% MoSe 2 incorporation in MoS 2 is attributed to the higher conductivity of the former . The double-layer capacitance ( C DL ) of electrocatalysts was evaluated by the slope of current density gradient v/s scan rate plot in the nonfaradaic region as demonstrated in Figure b . The C DL values of 2.5MMZ and 5MMZ heterostructures were estimated to be 23.8 and 26.3 mF/cm 2 , respectively, implying the advanced surface roughness of MoSe 2 –MoS 2 /ZnO heterostructures ascribed to a synergistically modulated ZnO surface by the MoSe 2 –MoS 2 heterojunctions.…”

Section: Resultsmentioning

confidence: 97%

Photoinduced Hole Trapping in MoSe₂–MoS₂ Nanoflowers/ZnO Nanosheets S-Scheme Conduit for Ultrafast Charge Transfer during Hydrogen Evolution

Ali,

Majumdar,

Chowdhury

et al. 2024

ACS Appl. Energy Mater.

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Paving the way out of sustainable energy applications, one of the most captivating aspirations is development of state-of-the-art catalytic systems for harnessing hydrogen energy. Here, a unique MoSe 2 −MoS 2 /ZnO heterojunction with S-scheme-type band alignment has been modeled to elucidate its ascendancy toward PC, EC, and PEC hydrogen generation. Optimized 5 wt % MoSe 2 −MoS 2 / ZnO (5MMZ) exhibited 5-fold superior PC H 2 production efficiency than bare ZnO, with 58.6% AQY ascribed to augmented solar harvesting and improved photophysical properties as confirmed by optoelectronic and theoretical analysis. Femtosecond transient absorption studies were carried out to provide deeper insights into the photoinduced charge carrier behavioral dynamics. It revealed that the delayed recombination of electron carriers at shallow and deep trap sites with holes was accountable for the higher activity of the 5MMZ heterostructure. XPS and DFT studies ascertained a great deal of correlation between experimental achievements and theoretical predictions as discussed in the reaction mechanism. To determine the diversified scope of MoSe 2 − MoS 2 /ZnO heterojunctions in green H 2 generation, photo/electrochemical water splitting operations were also performed, which further reinforced the versatility of this kind of metal oxide (ZnO)-bilayered material (MoSe 2 −MoS 2 )-type ternary heterostructures.

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Section: Resultsmentioning

confidence: 97%

Photoinduced Hole Trapping in MoSe₂–MoS₂ Nanoflowers/ZnO Nanosheets S-Scheme Conduit for Ultrafast Charge Transfer during Hydrogen Evolution

Ali,

Majumdar,

Chowdhury

et al. 2024

ACS Appl. Energy Mater.

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“…The size and morphology of the 2D MoS 2 thin sheet particles were evaluated by transmission electron microscopy (TEM), atomic force microscopy (AFM), and Raman spectroscopy ( Figure ).The mean lateral dimension of the 2D MoS 2 thin sheet particles, determined by TEM, is characterized by ≈2.5 μm in size (Figure 4a), higher than most of previously reported results (Table S1, Supporting Information). [ 26,72–92 ]…”

Section: Resultsmentioning

confidence: 99%

“…The formation mechanism of MoS 2 flowers involves a dissolution–nucleation–recrystallization process, which is well known for various bottom‐up approaches, namely, hydrothermal and solvothermal treatments (Table S2, Supporting Information), [ 26,72–92 ] but not for top‐down processes.…”

Section: Resultsmentioning

confidence: 99%

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Solubility of MoS₂ and Graphite in Molten Salt: Flowers, Faceted Crystals, or Exfoliation?

Ohayon‐Lavi

John

Lavi³

et al. 2023

Small Structures

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2D materials are of interest in various applications such as energy conversion, storage, and sensing. These materials are prepared by bottom‐up or top‐down methods that are difficult to control and suffer from low yield. Synthesis in molten salt is suggested as an alternative in which the balance between exfoliation and solubility is explored. It is demonstrated that when a pellet of 2D material is insoluble in molten salt (graphite in any salt), it is exfoliated. For low solubility (MoS2 in NaCl/KCl), the 2D material nucleates and grows into a small flowerlike structure composed of thin MoS2 sheets through Ostwald ripening. For high solubility in the molten salt (MoS2 in CsCl), it forms larger flowers. Herein, the molten salt treatment of high and low surface area MoS2 (micron‐size particles and a single large pellet, respectively) is compared. The particles yielded facet MoS2 crystals through dissolution–nucleation–recrystallization process and the pellet yielded flowers. Herein, methods for synthesizing 2D materials with controllable size and shape are promoted by simple molten salt treatment that opens an avenue to the development of soluble (MoS2) and non‐soluble (graphite) materials with different morphologies in a simple and affordable way.

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“…Liu et al divided salt templates into stable salt templates, decomposable salt templates and self-salt templates depends on their change during different pyrolysis processes. [77] Stable salt templates such as NaCl, [78][79][80] KCl, [81][82][83] and CaCl [82] are usually stable in pyrolysis and can form uniform porosity because they are usually soluble in carbon precursors. Decomposable salt templates such as ZnCl [84,85] and zinc nitrate [86] can decompose to metal or metal oxide in the carbonization of precursors.…”

Section: Salt Template Based Methodsmentioning

confidence: 99%

Mesoporous Carbon Materials for Electrochemical Energy Storage and Conversion

Yuan

Gao

et al. 2022

ChemElectroChem

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To meet the high‐speed commercialization demands of electrochemical energy storage and conversion devices, the development of high‐performance and low‐cost electrode materials is urgently necessary. Mesoporous carbon, which shows excellent intrinsic characteristics and flexible structure, has raised a surge of interest recently since it offers opportunities for improving the energy or power density and durability as well as reducing the cost of electrodes. In this paper, we first review primary methods for preparing mesoporous carbons. Next, the obstacles in lithium batteries, supercapacitors, proton exchange membrane fuel cells and water electrolyzers are analyzed and the recent progresses of mesoporous carbon based electrode designs in solving these obstacles are systematically introduced. Finally, we outline current challenges and future directions of developing mesoporous carbon based electrode materials in electrochemical energy storage and conversion devices. In creating this review, we hope to give a succinct introduction to the mesoporous carbon and provide meaningful references for its future research.

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Synthesis of MoS2 nanoparticles embedded, N, S co-doped mesoporous carbon via molten salt method as hydrogen evolution electrocatalyst under alkaline and neutral conditions

Cited by 10 publications

References 54 publications

Photoinduced Hole Trapping in MoSe₂–MoS₂ Nanoflowers/ZnO Nanosheets S-Scheme Conduit for Ultrafast Charge Transfer during Hydrogen Evolution

Photoinduced Hole Trapping in MoSe₂–MoS₂ Nanoflowers/ZnO Nanosheets S-Scheme Conduit for Ultrafast Charge Transfer during Hydrogen Evolution

Solubility of MoS₂ and Graphite in Molten Salt: Flowers, Faceted Crystals, or Exfoliation?

Mesoporous Carbon Materials for Electrochemical Energy Storage and Conversion

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Synthesis of MoS2 nanoparticles embedded, N, S co-doped mesoporous carbon via molten salt method as hydrogen evolution electrocatalyst under alkaline and neutral conditions

Cited by 10 publications

References 54 publications

Photoinduced Hole Trapping in MoSe2–MoS2 Nanoflowers/ZnO Nanosheets S-Scheme Conduit for Ultrafast Charge Transfer during Hydrogen Evolution

Photoinduced Hole Trapping in MoSe2–MoS2 Nanoflowers/ZnO Nanosheets S-Scheme Conduit for Ultrafast Charge Transfer during Hydrogen Evolution

Solubility of MoS2 and Graphite in Molten Salt: Flowers, Faceted Crystals, or Exfoliation?

Mesoporous Carbon Materials for Electrochemical Energy Storage and Conversion

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Product

Resources

About

Photoinduced Hole Trapping in MoSe₂–MoS₂ Nanoflowers/ZnO Nanosheets S-Scheme Conduit for Ultrafast Charge Transfer during Hydrogen Evolution

Photoinduced Hole Trapping in MoSe₂–MoS₂ Nanoflowers/ZnO Nanosheets S-Scheme Conduit for Ultrafast Charge Transfer during Hydrogen Evolution

Solubility of MoS₂ and Graphite in Molten Salt: Flowers, Faceted Crystals, or Exfoliation?