Solar light driven photoelectrocatalytic hydrogen evolution and dye degradation by metal-free few-layer MoS2 nanoflower/TiO2(B) nanobelts heterostructure

Paul, Kamal Kumar; Sreekanth, N P; Biroju, Ravi K.; Giri, P. K.

doi:10.1016/j.solmat.2018.05.056

Cited by 147 publications

(36 citation statements)

References 54 publications

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“…The characteristic peaks corresponding to S 2p 3/2 and S 2p 1/2 orbitals of the divalent sulfide ions (S 2− ) in [MoS 2 ] and [MoS 2(1− x ) Se 2 x ] are located at [162.8 & 164.0 eV] and [162.5 & 163.7 eV], respectively. Besides, an additional peak is observed at 161.2 eV, which may be due to the formation of S–Se and amorphous sulfur in the MoS 2(1− x ) Se 2 x system . Interestingly, the observed negative binding energy shifts in both Mo‐3d (3d 5/2, 3d 3/2 ) and S‐2p (2p 3/2 , 2p 1/2 ) around 0.3 eV in MoS 2(1− x ) Se 2 x with respect to MoS 2 can be due to the alloying of “Se” with MoS 2 basal plane lattice (which is later proved using TEM).…”

Section: Comparison Of Tafel Slopes Of Triangles and Dendritesmentioning

confidence: 93%

On the Synthesis of Morphology‐Controlled Transition Metal Dichalcogenides via Chemical Vapor Deposition for Electrochemical Hydrogen Generation

Sharma

Sahoo

Rastogi

et al. 2019

Physica Rapid Research Ltrs

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Shape‐engineered atomically thin transition metal dichalcogenide (TMD) crystals are highly intriguing systems with regard to both fundamental and applied science. Herein, a chemical vapor deposition‐assisted generalized synthesis strategy for the triangular‐ and dendritic‐shaped TMDs and their ternary alloys is proposed, and the TMD structures' potential for electrocatalytic hydrogen evolution reaction (HER) applications is demonstrated. The alloy formation is confirmed via micro‐Raman and photoluminescence studies and further verified using transmission electron microscopy and X‐ray photoelectron spectroscopy. The HER activities of MoS2 and MoSe2 triangles are compared with those of their dendritic structures, and an enormous improvement in terms of overpotential and current density is observed for the dendritic structures. A further enhancement of the HER activity is observed in MoS2(1−x)Se2x triangular and dendritic structures, with dendritic MoS2(1−x)Se2x providing the best activity. The demonstrated nonequilibrium growth technique opens new avenues for the synthesis of morphology‐controlled, large area, complex, and atomically thin TMD structures, which can have unprecedented properties, such as the enormous catalytic activity, tunable luminescence, etc., as presented in this article.

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Section: Comparison Of Tafel Slopes Of Triangles and Dendritesmentioning

confidence: 93%

On the Synthesis of Morphology‐Controlled Transition Metal Dichalcogenides via Chemical Vapor Deposition for Electrochemical Hydrogen Generation

Sharma

Sahoo

Rastogi

et al. 2019

Physica Rapid Research Ltrs

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“…MoS 2 nanosheets promote different hydrogen production rates through structure matching with different semiconductors. In recent research works, different structural compositions of MoS 2 nanosheets and semiconductors showed noticeable enhancement of photocatalytic production, such as nanoparticles, quantum dots, nanobelts,99a,b,110 nanoflowers, and nanoplates . The semiconductor TiO 2 has relatively superior catalytic properties in practical applications while pure TiO 2 mainly absorbs UV light, which limits photocatalytic absorption of visible light 110a,113.…”

Section: Interfacial Activities Of Mos2 For Enhanced Hydrogen Evolutionmentioning

confidence: 99%

A Critical Review on Enhancement of Photocatalytic Hydrogen Production by Molybdenum Disulfide: From Growth to Interfacial Activities

Zhang

Tong

et al. 2019

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Ultrathin 2D molybdenum disulfide (MoS2), which is the flagship of 2D transition‐metal dichalcogenide nanomaterials, has drawn much attention in the last few years. 2D MoS2 has been banked as an alternative to platinum for highly active hydrogen evolution reaction because of its low cost, high surface‐to‐volume ratio, and abundant active sites. However, when MoS2 is used directly as a photocatalyst, contrary to public expectation, it still performs poorly due to lateral size, high recombination ratio of excitons, and low optical cross section. Besides, simply compositing MoS2 as a cocatalyst with other semiconductors cannot satisfy the practical application, which stimulates the pursual of a comprehensive insight into recent advances in synthesis, properties, and enhanced hydrogen production of MoS2. Therefore, in this Review, emphasis is given to synthetic methods, phase transitions, tunable optical properties, and interfacial engineering of 2D MoS2. Abundant ways of band edge tuning, structural modification, and phase transition are addressed, which can generate the neoteric photocatalytic systems. Finally, the main challenges and opportunities with respect to MoS2 being a cocatalyst and coherent light–matter interaction of MoS2 in photocatalytic systems are proposed.

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“…This binary component structure without any conductive network suffers from longer duration of degradation and low rate of kinetics compared to other reported ternary composites. In addition to the above‐mentioned materials, the various reported photocatalysts like TiO 2 nanobelts coated with MoS 2 nanosheets, MoS 2 nanoflower/TiO 2 (B) nanobelts, Cu 2 O/rGO, etc. also had limitation of longer degradation time.…”

Section: Resultsmentioning

confidence: 99%

Reusable, Free‐Standing MoS₂/rGO/Cu₂O Ternary Composite Films for Fast and Highly Efficient Sunlight Driven Photocatalytic Degradation

2020

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In this work, a novel free‐standing three‐dimensional MoS2/rGO/Cu2O ternary composite grown on etched carbon paper is successfully synthesized by simple hydrothermal method and demonstrated for very fast photocatalytic degradation of methylene blue (MB), rhodamine B (RhB) and binary mixture MB‐RhB under natural sunlight irradiation. Interestingly, the ternary film exhibits fast dyes degradation of ∼98 % within 45 min of irradiation indicating its excellent photocatalytic activity owing to efficient absorption in broad range of spectrum and the combined synergistic effects of the nanostructures. In addition, the stable photocatalyst film is reused six times without any major loss in efficiency thus making it suitable for real time applications for sustainable environment. The as‐prepared free‐standing, reusable and stable film demonstrates a wide potential in environmental monitoring applications such as removal of organic pollutants and wastewater treatment.

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Solar light driven photoelectrocatalytic hydrogen evolution and dye degradation by metal-free few-layer MoS2 nanoflower/TiO2(B) nanobelts heterostructure

Cited by 147 publications

References 54 publications

On the Synthesis of Morphology‐Controlled Transition Metal Dichalcogenides via Chemical Vapor Deposition for Electrochemical Hydrogen Generation

On the Synthesis of Morphology‐Controlled Transition Metal Dichalcogenides via Chemical Vapor Deposition for Electrochemical Hydrogen Generation

A Critical Review on Enhancement of Photocatalytic Hydrogen Production by Molybdenum Disulfide: From Growth to Interfacial Activities

Reusable, Free‐Standing MoS₂/rGO/Cu₂O Ternary Composite Films for Fast and Highly Efficient Sunlight Driven Photocatalytic Degradation

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Solar light driven photoelectrocatalytic hydrogen evolution and dye degradation by metal-free few-layer MoS2 nanoflower/TiO2(B) nanobelts heterostructure

Cited by 147 publications

References 54 publications

On the Synthesis of Morphology‐Controlled Transition Metal Dichalcogenides via Chemical Vapor Deposition for Electrochemical Hydrogen Generation

On the Synthesis of Morphology‐Controlled Transition Metal Dichalcogenides via Chemical Vapor Deposition for Electrochemical Hydrogen Generation

A Critical Review on Enhancement of Photocatalytic Hydrogen Production by Molybdenum Disulfide: From Growth to Interfacial Activities

Reusable, Free‐Standing MoS2/rGO/Cu2O Ternary Composite Films for Fast and Highly Efficient Sunlight Driven Photocatalytic Degradation

Contact Info

Product

Resources

About

Reusable, Free‐Standing MoS₂/rGO/Cu₂O Ternary Composite Films for Fast and Highly Efficient Sunlight Driven Photocatalytic Degradation