scholarly journals CoS2/TiO2 Nanocomposites for Hydrogen Production under UV Irradiation

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3882 ◽  
Author(s):  
Sivagowri Shanmugaratnam ◽  
Dhayalan Velauthapillai ◽  
Punniamoorthy Ravirajan ◽  
Alfred Christy ◽  
Yohi Shivatharsiny
Keyword(s):  
Hydrogen Production ◽  
Transition Metal ◽  
Uv Irradiation ◽  
Quantum Confinement Effect ◽  
Photogenerated Electron ◽  
Metal Chalcogenides ◽  
Transition Metal Dichalcogenide ◽  
Nanocrystalline Tio2 ◽  
Hydrothermal Approach ◽  
Production Efficiencies

Transition metal chalcogenides have intensively focused on photocatalytic hydrogen production for a decade due to their stronger edge and the quantum confinement effect. This work mainly focuses on synthesis and hydrogen production efficiencies of cobalt disulfide (CoS2)-embedded TiO2 nanocomposites. Materials are synthesized by using a hydrothermal approach and the hydrogen production efficiencies of pristine CoS2, TiO2 nanoparticles and CoS2/TiO2 nanocomposites are compared under UV irradiation. A higher amount of hydrogen production (2.55 mmol g−1) is obtained with 10 wt.% CoS2/TiO2 nanocomposite than pristineTiO2 nanoparticles, whereas no hydrogen production was observed with pristine CoS2 nanoparticles. This result unveils that the metal dichalcogenide–CoS2 acts as an effective co-catalyst and nanocrystalline TiO2 serves as an active site by effectively separating the photogenerated electron–hole pair. This study lays down a new approach for developing transition metal dichalcogenide materials with significant bandgaps that can effectively harness solar energy for hydrogen production.

scholarly journals Recent Progress and Approaches on Transition Metal Chalcogenides for Hydrogen Production

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8265
Author(s):  
Sivagowri Shanmugaratnam ◽  
Elilan Yogenthiran ◽  
Ranjit Koodali ◽  
Punniamoorthy Ravirajan ◽  
Dhayalan Velauthapillai ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Transition Metal ◽  
Environmental Sustainability ◽  
Quantum Confinement Effect ◽  
Particle Sizes ◽  
Metal Chalcogenides ◽  
Solar Hydrogen ◽  
Sustainability Transition ◽  
Transition Metal Chalcogenides ◽  
Solar Hydrogen Production

Development of efficient and affordable photocatalysts is of great significance for energy production and environmental sustainability. Transition metal chalcogenides (TMCs) with particle sizes in the 1–100 nm have been used for various applications such as photocatalysis, photovoltaic, and energy storage due to their quantum confinement effect, optoelectronic behavior, and their stability. In particular, TMCs and their heterostructures have great potential as an emerging inexpensive and sustainable alternative to metal-based catalysts for hydrogen evolution. Herein, the methods used for the fabrication of TMCs, characterization techniques employed, and the different methods of solar hydrogen production by using different TMCs as photocatalyst are reviewed. This review provides a summary of TMC photocatalysts for hydrogen production.

Study of photogenerated exciton dissociation in transition metal dichalcogenide van der Waals heterojunction A2-MWS4: A first-principle study

2021 ◽  
Author(s):  
Hong Cui ◽  
yazhou wang ◽  
Tong Liu ◽  
Yunjian Chen ◽  
Pengyue Shan ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Transition Metal ◽  
Production Efficiency ◽  
Van Der Waals ◽  
Transition Metal Dichalcogenide ◽  
First Principle ◽  
Exciton Dissociation ◽  
Photocatalytic Hydrogen Production

In order to explore the photocatalytic hydrogen production efficiency of MoS2/WSe2 heterostructure (A2-MWS4) as photocatalysts, It is highly desirable to study the photogenerated exciton dissociation related to photocatalysis. The electronic...

Observation of quantum-confined exciton states in monolayer WS2 quantum dots by ultrafast spectroscopy

Nanoscale ◽  
2021 ◽  
Author(s):  
Shuwen Zheng ◽  
Lei Wang ◽  
Hai-yu Wang ◽  
chenyu Xu ◽  
Yang Luo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transition Metal ◽  
Edge Effect ◽  
Quantum Confinement ◽  
Ultrafast Spectroscopy ◽  
Photophysical Properties ◽  
Quantum Confinement Effect ◽  
Confinement Effect ◽  
Transition Metal Dichalcogenide ◽  
Fundamental Study

Monolayer transition metal dichalcogenide quantum dots (TMDC QDs) could exhibit unique photophysical properties, because of both lateral quantum confinement effect and edge effect. However, there is little fundamental study on...

In situ photo-assisted deposition and photocatalysis of ZnIn2S4/transition metal chalcogenides for enhanced degradation and hydrogen evolution under visible light

2016 ◽  
Vol 45 (2) ◽  
pp. 552-560 ◽  
Author(s):  
Wei Yang Lim ◽  
Minghui Hong ◽  
Ghim Wei Ho
Keyword(s):  
Hydrogen Production ◽  
Transition Metal ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Metal Chalcogenides ◽  
Co Catalyst ◽  
Photocatalytic Hydrogen Production ◽  
Transition Metal Chalcogenides ◽  
Enhanced Degradation

In-situ aqueous photo-assisted deposition of transition metal chalcogenides co-catalyst has shown to infiltrate hierarchical host ZnIn2S4 photocatalyst for efficient photocatalytic hydrogen production and degradation under visible light.

scholarly journals Toward heterostructured transition metal hybrids with highly promoted electrochemical hydrogen evolution

RSC Advances ◽  
2019 ◽  
Vol 9 (35) ◽  
pp. 19924-19929 ◽  
Author(s):  
Guanhui Gao ◽  
Xiaobin Xie ◽  
Shendong Kang ◽  
Yanhua Lei ◽  
Achim Trampert ◽  
...  
Keyword(s):  
Transition Metal ◽  
Electrochemical Properties ◽  
Hydrogen Evolution ◽  
Low Cost ◽  
Transition Metal Dichalcogenide ◽  
Hydrothermal Approach ◽  
Metal Hybrids ◽  
Sustainable Transition

Low-cost and sustainable transition metal dichalcogenide heterostructures are developed via a hydrothermal approach, which could greatly promote their electrochemical properties for HER performance as electrocatalysts.

Transition metal dichalcogenide-based composites for hydrogen production

2019 ◽  
Vol 1 (1) ◽  
pp. 012001 ◽  
Author(s):  
Mahider Tekalgne ◽  
Amirhossein Hasani ◽  
Quyet Van Le ◽  
Soo Young Kim
Keyword(s):  
Hydrogen Production ◽  
Transition Metal ◽  
Transition Metal Dichalcogenide

Wrinkle facilitated hydrogen evolution reaction of vacancy-defected transition metal dichalcogenide monolayers

Nanoscale ◽  
2021 ◽  
Author(s):  
Mingjie Pu ◽  
Yufeng Guo ◽  
Wanlin Guo
Keyword(s):  
Hydrogen Production ◽  
Transition Metal ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
First Principles ◽  
Transition Metal Dichalcogenides ◽  
Transition Metal Dichalcogenide ◽  
First Principles Calculations ◽  
Catalytic Activities ◽  
Metal Dichalcogenides

Utilizing transition metal dichalcogenides (TMDs) as catalysts in hydrogen evolution reaction (HER) exhibits a promising prospect for hydrogen production. Here by first-principles calculations we reveal that the catalytic activities of...

scholarly journals Metallic phase transition metal dichalcogenide quantum dots showing different optical charge excitation and decay pathways

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Bo-Hyun Kim ◽  
Min-Ho Jang ◽  
Hyewon Yoon ◽  
Hyun Jun Kim ◽  
Yong-Hoon Cho ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transition Metal ◽  
Photophysical Properties ◽  
Quantum Confinement Effect ◽  
Stokes Shift ◽  
Transition Metal Dichalcogenides ◽  
Metallic Phase ◽  
Excitation Wavelength ◽  
Transition Metal Dichalcogenide ◽  
Defect States

AbstractThe charge excitation and decay pathways of two-dimensional heteroatomic quantum dots (QDs) are affected by the quantum confinement effect, bandgap structure and strong exciton binding energy. Recently, semiconducting transition metal dichalcogenides (TMDs) have been intensively studied; however, the charge dynamics of metallic phase QDs (mQDs) of TMDs remain relatively unknown. Herein, we investigate the photophysical properties of TMD-mQDs of two sizes, where the TMD-mQDs show different charge excitation and decay pathways that are mainly ascribed to the defect states and valence band splitting, resulting in a large Stokes shift and two excitation bands for maximum photoluminescence (PL). Interestingly, the dominant excitation band redshifts as the size increases, and the time-resolved PL peak redshifts at an excitation wavelength of 266 nm in the smaller QDs. Additionally, the lifetime is shortened in the larger QDs. From the structural and theoretical analysis, we discuss that the charge decay pathway in the smaller QDs is predominantly affected by edge oxidation, whereas the vacancies play an important role in the larger QDs.

scholarly journals Visualization of Multifractal Superconductivity in a Two-Dimensional Transition Metal Dichalcogenide in the Weak-Disorder Regime

Nano Letters ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 5111-5118 ◽  
Author(s):  
Carmen Rubio-Verdú ◽  
Antonio M. Garcı́a-Garcı́a ◽  
Hyejin Ryu ◽  
Deung-Jang Choi ◽  
Javier Zaldı́var ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Weak Disorder
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