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Catalysts 2017, 7(1), 18; doi:10.3390/catal7010018

Facile Sonication Synthesis of WS2 Quantum Dots for Photoelectrochemical Performance

1
National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
2
School of Geography and Biological Information, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Alain Roucoux and Audrey Denicourt
Received: 28 November 2016 / Revised: 27 December 2016 / Accepted: 30 December 2016 / Published: 6 January 2017
(This article belongs to the Special Issue Soluble Nanoparticles in Catalytic Applications)
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Abstract

Two-dimensional transition metal dichalcogenides, such as tungsten disulfide (WS2), have been actively studied as suitable candidates for photocatalysts due to their unique structural and electronic properties. The presence of active sites at the edges and the higher specific surface area of these materials are crucial to the photocatalytic activity of the hydrogen evolution reaction. Here, WS2 quantum dots (QDs) have been successfully synthesized by using a combination of grinding and sonication techniques. The morphology of the QDs was observed, using transmission electron microscopy and an atomic force microscope, to have uniform sizes of less than 5 nm. Photoelectrochemical (PEC) measurements show that the current density of WS2 QDs under illumination is almost two times higher than that of pristine WS2. Furthermore, these high-quality WS2 QDs may have various applications in optoelectronics, solar cells, and biomedicine. View Full-Text
Keywords: tungsten disulfide; quantum dots; sonication; photocatalysis tungsten disulfide; quantum dots; sonication; photocatalysis
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Zhou, L.; Yan, S.; Wu, H.; Song, H.; Shi, Y. Facile Sonication Synthesis of WS2 Quantum Dots for Photoelectrochemical Performance. Catalysts 2017, 7, 18.

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