Self-Assembled Monolayers of Molybdenum Sulfide Clusters on Au Electrode as Hydrogen Evolution Catalyst for Solar Water Splitting

Spring, Stephanie; Shinde, Pravin S.; Fontenot, Patricia R.; Donahue, James P.; Pan, Shanlin

doi:10.3390/inorganics7060079

Cited by 4 publications

(6 citation statements)

References 37 publications

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“…When the MoS 2 nanoflakes are thin, the rapid occurrence of electron charge transfer and high photocurrent density are observed. The photocurrent density at 750 °C is higher compared to 900 °C due to the rich in S where S rich has been reported to influence the catalytic activity for an efficient HER catalyst [37,38]. Interestingly, the photocurrent density of MoS 2 in acidic electrolyte (figure 3(b)) is higher compared with that of MoS 2 in neutral electrolyte (figure 3(a)).…”

Section: Effect Of Cvd Temperature On Mos 2 Growthmentioning

confidence: 95%

Vertical MoS₂ on SiO₂/Si and graphene: effect of surface morphology on photoelectrochemical properties

et al. 2020

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Two-dimensional materials have attracted intensive attention recently due to their unique optical and electronic properties and their promising applications in water splitting and solar cells. As a representative layer-structured of transition metal dichalcogenides, MoS2 has attracted considerable devotion owing to its exceptional photo and electro properties. Here, we show that the chemical vapour deposition (CVD) growth of MoS2 on Si photocathode and graphene/Si photocathode can be used to prepare photoelectrocatalysts for water splitting. We explore a bottom‐up method to grow vertical heterostructures of MoS2 and graphene by using the two‐step CVD. Graphene is first grown through ambient-pressure CVD on a Cu substrate and then transferred onto SiO2/Si substrate by using the chemical wet transfer followed by the second CVD method to grow MoS2 over the graphene/SiO2/Si. The effect of the growth temperatures of MoS2 is studied, and the optimum temperature is 800 °C. The MoS2 produced at 800 °C has the highest photocurrent density at −0.23 mA cm−2 in 0.5 M Na2SO4 and −0.51 mA cm−2 in 0.5 M H2SO4 at −0.8 V versus Ag/AgCl. The linear sweep voltammetry shows that MoS2 in 0.5 M H2SO4 has about 55% higher photocurrent density than MoS2 in Na2SO4 due to the higher concentration of protons (H+) in the H2SO4 electrolyte solution. Protons are reduced to H2 at lower overvoltage and hydrogen generation is thus enhanced at higher photocurrent density. MoS2/graphene/SiO2/Si (MGS) has −0.07 mA cm−2 at −0.8 V versus Ag/AgCl of photocurrent density, which is 70% lower than that of bare MoS2 because MGS is thicker compared with MoS2. Thus, MoS2 has potential as a photocatalyst in photoelectrochemical water splitting. The structure and the morphology of MoS2 play an important role in determining the photocurrent performance.

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Section: Effect Of Cvd Temperature On Mos 2 Growthmentioning

confidence: 95%

Vertical MoS₂ on SiO₂/Si and graphene: effect of surface morphology on photoelectrochemical properties

et al. 2020

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“…Hence, Tafel slopes were used as an indicator of the catalytic activity. The HER mechanism in acidic conditions follows either the Volmer-Heyrovsky mechanism or the Volmer-Tafel mechanism [23].…”

Section: The Effect Of Immersion Time On Catalytic Activitymentioning

confidence: 99%

“…The HER mechanism in acidic conditions follows either the Volmer-Heyrovsky mechanism or the Volmer-Tafel mechanism [23].…”

Section: The Effect Of Immersion Time On Catalytic Activitymentioning

confidence: 99%

Hydrogen Gas Generation Using Self-Assembled Monolayers (SAMs) of 5,10,15,20-Tetrakis (p-Thiophenol) Porphyrin on a Gold Electrode

Elghamry,

Alablan,

Abdelsalam

2023

Catalysts

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A novel approach was used to synthesize the 5,10,15,20-tetrakis (p-thiophenol) porphyrin (TPTH-P) (2), which involved the demethylation of tetra (p-anisole) porphyrin (1) in the presence of ZnCl2 as a catalyst and DMF as a solvent at 100 °C. The demethylation step was followed by an acidification step with concentrated H2SO4 to yield the desired TPTH-P (2) in an almost quantitative yield (95%). The chemical structure of the synthesized porphyrin thiol (TPTH-P) (2) was verified through spectroscopic techniques (NMR, IR, UV-Vis). The catalytic activity of TPTH-P in the hydrogen evolution reaction (HER) was investigated in 0.1 M of H2SO4 and 1 M of KNO3. A self-assembled monolayer (SAM) of TPTH-P was formed on a gold electrode. The immersion time during SAM formation and the electrochemical activation cycles in H2SO4 were found to be important to enhancing the activity of the Au-TPTH-P electrode in the HER. Contact angle measurements and electrochemical techniques, including cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and chronoamperometry, were used to characterize and evaluate the electrochemical activities of the SAM.

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“…These stabilized nanosheets can easily be implanted in several applications, thanks to its compatibility in different manufacturing technique, as spin-coating, inkjet printing, spray coating, vacuum filtration, and electrodeposition. [202][203][204][205][206] Several research groups worldwide, systematically performing LPE to produce all sorts of 2D materials in various liquid media as discussed in following area. Figure 6b indicates different TMDCs nanosheets exfoliate in aqueous media through.…”

Section: Dynamics Of Liquid-phase Exfoliationmentioning

confidence: 99%

Advances in Liquid‐Phase and Intercalation Exfoliations of Transition Metal Dichalcogenides to Produce 2D Framework

Raza

Hassan

Ikram

et al. 2021

Adv Materials Inter

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(5 of 46)www.advmatinterfaces.de Figure 3. a) Electronic band structure of various 2D materials. Reproduced under the terms of the CC-BY 4.0 license. [95] Copyright 2016, The Authors, published by MDPI. b) Energy level diagrams of various TMDCs. Reproduced with permission. [19] Copyright 2017, Elsevier B.V. c) Archetypal coordination of TMDCs, octahedral coordination forms 1T structures, while triangular prismatic coordination establishes 2H/3R structures. Reproduced with permission. [82] Copyright 2019, Elsevier. d) Structural top view of various polytypes; in 2H, two layers per repeat, the unit shows trigonal prismatic coordination and in 1T, one layer per repeat unit formed octahedral coordination of TMDCs. Reproduced with permission. [89] Copyright 2012, Springer Nature. e) 3D illustration of typical MX 2 structure having chalcogen (yellow atom) and metal (gray atom). Reproduced with permission. [104] Copyright 2011, Springer Nature. f) Schematic demonstration of phonon active modes and their symmetries of bulks and monolayer in MX 2 structures. Reproduced under the terms of the CC-BY 3.0 license. [105]

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Self-Assembled Monolayers of Molybdenum Sulfide Clusters on Au Electrode as Hydrogen Evolution Catalyst for Solar Water Splitting

Cited by 4 publications

References 37 publications

Vertical MoS₂ on SiO₂/Si and graphene: effect of surface morphology on photoelectrochemical properties

Vertical MoS₂ on SiO₂/Si and graphene: effect of surface morphology on photoelectrochemical properties

Hydrogen Gas Generation Using Self-Assembled Monolayers (SAMs) of 5,10,15,20-Tetrakis (p-Thiophenol) Porphyrin on a Gold Electrode

Advances in Liquid‐Phase and Intercalation Exfoliations of Transition Metal Dichalcogenides to Produce 2D Framework

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Self-Assembled Monolayers of Molybdenum Sulfide Clusters on Au Electrode as Hydrogen Evolution Catalyst for Solar Water Splitting

Cited by 4 publications

References 37 publications

Vertical MoS2 on SiO2/Si and graphene: effect of surface morphology on photoelectrochemical properties

Vertical MoS2 on SiO2/Si and graphene: effect of surface morphology on photoelectrochemical properties

Hydrogen Gas Generation Using Self-Assembled Monolayers (SAMs) of 5,10,15,20-Tetrakis (p-Thiophenol) Porphyrin on a Gold Electrode

Advances in Liquid‐Phase and Intercalation Exfoliations of Transition Metal Dichalcogenides to Produce 2D Framework

Contact Info

Product

Resources

About

Vertical MoS₂ on SiO₂/Si and graphene: effect of surface morphology on photoelectrochemical properties

Vertical MoS₂ on SiO₂/Si and graphene: effect of surface morphology on photoelectrochemical properties