Transition Metal Chalcogenide (TMC) Nanocomposites for Environmental Remediation Application over Extended Solar Irradiation

Shanmugaratnam, Sivagowri; Rasalingam, Shivatharsiny

doi:10.5772/intechopen.83628

Cited by 15 publications

(12 citation statements)

References 30 publications

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Section: Introductionmentioning

confidence: 99%

“…Recently, transition metal chalcogenides (TMCs) have gained more attention due to their electrocatalytic properties that includes indirect bandgaps, optoelectronic behavior, and their stability [16,17]. Moreover, the stronger edge effects and the quantum confinement effects make these nanodots (quantum dots) or nanostructures of metal chalcogenides possible to utilize considerable amounts of solar irradiation [17][18][19]. These are playing an increasingly important role in different applications, such as photo degradation [20], capacitors [21], and hydrogen evolution [22] due to their suitable electronic and optical properties.…”

Section: Introductionmentioning

confidence: 99%

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SnS2/TiO2 Nanocomposites for Hydrogen Production and Photodegradation under Extended Solar Irradiation

et al. 2021

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Earth–abundant transition metal chalcogenide materials are of great research interest for energy production and environmental remediation, as they exhibit better photocatalytic activity due to their suitable electronic and optical properties. This study focuses on the photocatalytic activity of flower-like SnS2 nanoparticles (composed of nanosheet subunits) embedded in TiO2 synthesized by a facile hydrothermal method. The materials were characterized using different techniques, and their photocatalytic activity was assessed for hydrogen evolution reaction and the degradation of methylene blue. Among the catalysts studied, 10 wt. % of SnS2 loaded TiO2 nanocomposite shows an optimum hydrogen evolution rate of 195.55 µmolg−1, whereas 15 wt. % loading of SnS2 on TiO2 exhibits better performance against the degradation of methylene blue (MB) with the rate constant of 4.415 × 10−4 s−1 under solar simulated irradiation. The improved performance of these materials can be attributed to the effective photo-induced charge transfer and reduced recombination, which make these nanocomposite materials promising candidates for the development of high-performance next-generation photocatalyst materials. Further, scavenging experiments were carried out to confirm the reactive oxygen species (ROS) involved in the photocatalytic degradation. It can be observed that there was a 78% reduction in the rate of degradation when IPA was used as the scavenger, whereas around 95% reduction was attained while N2 was used as the scavenger. Notably, very low degradation (<5%) was attained when the dye alone was directly under solar irradiation. These results further validate that the •OH radical and the superoxide radicals can be acknowledged for the degradation mechanism of MB, and the enhancement of degradation efficiency may be due to the combined effect of in situ dye sensitization during the catalysis and the impregnation of low bandgap materials on TiO2.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

SnS2/TiO2 Nanocomposites for Hydrogen Production and Photodegradation under Extended Solar Irradiation

et al. 2021

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“…Transition metal chalcogenides have been reported to be emerging candidates for application in various fields because of their unique optoelectronic properties, stability, and lower bandgaps [27]. The high metallic property of selenium makes selenides possess higher electrical conductivities compared to oxides and sulphides.…”

Section: Nickel Selenide Quantum Dot Materialsmentioning

confidence: 99%

“…The high metallic property of selenium makes selenides possess higher electrical conductivities compared to oxides and sulphides. Nickel, a 3d transition metal, is much cheaper and less toxic compared to cadmium and other transition group metals [27,28]. Nickel and selenium form different homogenous and crystalline phases such as NiSe 2 , Ni 1-x Se, and Ni 3 Se 2, although other compounds are known to exist.…”

Section: Nickel Selenide Quantum Dot Materialsmentioning

confidence: 99%

Nickel Selenide Quantum Dot Applications in Electrocatalysis and Sensors

et al. 2020

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Quantum dots (QDs) are semiconducting materials with diameters ranging from 2-10 nm. Amongst these QDs, nickel selenide quantum dot (NiSeQD) materials have gained much interest from researchers over the past few years due to their outstanding properties. These include excellent catalytic activity, good electrical conductivity for charge transfer, and excellent thermodynamic stability. NiSeQD material is relatively cheap, less toxic, and can be synthesised easily. Due to the fascinating and remarkable properties of NiSeQD, the material has been applied in various electrochemical fields, including hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and solar cells. This review focuses on the application of NiSeQD and its composites in the various analytical fields in the search for alternative renewable sources of energy. Interestingly, NiSeQD material can be modified with different materials to improve its sensitivity, reactivity, and limit of detection. The effects of modification with other materials such as iron (Fe), cobalt (Co), and graphene (GN) are mentioned. Additionally, the application of NiSeQD in glucose sensing is discussed briefly. In these aforementioned applications, NiSeQD has shown excellent electrocatalytic capability with satisfactory detection limits and good conductivity. Thus, further exploration of it to other fields is essential. This review highlights the importance of NiSeQD in water purification, and no report has been documented in the literature on its application in water purification. Some gaps are still open for the use of NiSeQD material as an electroactive platform for sensing devices in water treatment.

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“…Tremendous amount of work has been done thus far on the physical and chemical properties as well as on the synthesis and the characterization of 2D materials such as graphene [13,14], transition metal chalcogenides [15,16] and dichalcogenides [17][18][19], hexagonal boron nitride [20], black phosphorus [21], organic perovskites [22], etc. Many of these materials have been used to fabricate stacked 2D-2D heterostructures [23], 2D-3D heterojunctions with common bulk semiconductors [24,25], or even 0D-2D and 1D-2D hybrids [26].…”

Section: Introductionmentioning

confidence: 99%

Emerging 2D Materials and Their Van Der Waals Heterostructures

Bartolomeo

2020

Nanomaterials

107

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Two-dimensional (2D) materials and their van der Waals heterojunctions offer the opportunity to combine layers with different properties as the building blocks to engineer new functional materials for high-performance devices, sensors, and water-splitting photocatalysts. A tremendous amount of work has been done thus far to isolate or synthesize new 2D materials as well as to form new heterostructures and investigate their chemical and physical properties. This article collection covers state-of-the-art experimental, numerical, and theoretical research on 2D materials and on their van der Waals heterojunctions for applications in electronics, optoelectronics, and energy generation.

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Transition Metal Chalcogenide (TMC) Nanocomposites for Environmental Remediation Application over Extended Solar Irradiation

Cited by 15 publications

References 30 publications

SnS2/TiO2 Nanocomposites for Hydrogen Production and Photodegradation under Extended Solar Irradiation

SnS2/TiO2 Nanocomposites for Hydrogen Production and Photodegradation under Extended Solar Irradiation

Nickel Selenide Quantum Dot Applications in Electrocatalysis and Sensors

Emerging 2D Materials and Their Van Der Waals Heterostructures

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