Improved charge carrier dynamics of WS2 nanostructures by the way of CdS@WS2 heterostructures for use in water splitting and water purification

Velpandian, Muthuraja and Pulipaka, Supriya and Tikoo, Akshay and Meduri, Praveen (2020) Improved charge carrier dynamics of WS2 nanostructures by the way of CdS@WS2 heterostructures for use in water splitting and water purification. Sustainable Energy & Fuels, 4 (8). pp. 4096-4107. ISSN 2398-4902

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Abstract

Heterostructures consisting of tungsten disulfide (WS2) and cadmium sulfide (CdS) have shown longer emission decay life time and significantly quenched fluorescence emission in comparison to pure materials (WS2 and CdS). CdS@WS2 heterostructures also show a significant enhancement in light absorption across the entire visible spectrum with a change in the slope of the absorption edge pertaining to WS2 nanostructures in the heterostructures. This leads to higher number of charge carriers, improved charge separation as well as charge migration from the material surface to the back contact. In photoelectrochemical water splitting, the heterostructures exhibited a twentyfold increase in photocurrent density (0.15 mA cm-2) at 1.23 V vs. RHE in comparison to pristine sulfides. The heterostructures also showed a good reduction ratio of >83% in 120 minutes [Cr(vi) to Cr(iii)] in a mixture of Cr(vi)/Ni(ii) ions and RhB. Hence, CdS@WS2 heterostructures with improved charge carrier dynamics can find several applications as photocatalysts.

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IITH Creators:

IITH Creators	ORCiD
Velpandian, Muthuraja	UNSPECIFIED
Pulipaka, Supriya	UNSPECIFIED
Tikoo, Akshay	UNSPECIFIED
Meduri, Praveen	UNSPECIFIED

Item Type:

Article

Uncontrolled Keywords:

Charge carrier dynamics; Charge separations; Fluorescence emission; Photocurrent density; Photoelectrochemical water splitting; Reduction ratios; Tungsten disulfide; Water purification;Absorption spectroscopy; Cadmium sulfide; Carrier mobility; Fluorescence quenching; II-VI semiconductors; Light absorption; Sulfur compounds; Tungsten compounds

Subjects:

Chemical Engineering

Divisions:

Department of Chemical Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

07 Aug 2021 04:40

Last Modified:

07 Aug 2021 04:40

URI:

http://raiithold.iith.ac.in/id/eprint/8718