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Catalysts 2016, 6(9), 136; doi:10.3390/catal6090136

WS2 as an Effective Noble-Metal Free Cocatalyst Modified TiSi2 for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

1
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
2
Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada
*
Authors to whom correspondence should be addressed.
Academic Editors: Di-Jia Liu and Jianguo Liu
Received: 23 July 2016 / Revised: 26 August 2016 / Accepted: 5 September 2016 / Published: 10 September 2016
(This article belongs to the Special Issue Heterogeneous Catalysis & Hydrogen Storage)
View Full-Text   |   Download PDF [4349 KB, uploaded 10 September 2016]   |  

Abstract

A noble-metal free photocatalyst consisting of WS2 and TiSi2 being used for hydrogen evolution under visible light irradiation, has been successfully prepared by in-situ formation of WS2 on the surface of TiSi2 in a thermal reaction. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results demonstrate that WS2 moiety has been successfully deposited on the surface of TiSi2 and some kind of chemical bonds, such as Ti-S-W and Si-S-W, might have formed on the interface of the TiSi2 and WS2 components. Optical and photoelectrochemical investigations reveal that WS2/TiSi2 composite possesses lower hydrogen evolution potential and enhanced photogenerated charge separation and transfer efficiency. Under 6 h of visible light (λ > 420 nm) irradiation, the total amount of hydrogen evolved from the optimal WS2/TiSi2 catalyst is 596.4 μmol·g−1, which is around 1.5 times higher than that of pure TiSi2 under the same reaction conditions. This study shows a paradigm of developing the effective, scalable and inexpensive system for photocatalytic hydrogen generation. View Full-Text
Keywords: WS2/TiSi2 composite; noble-metal free; visible light; photocatalyst; hydrogen evolution WS2/TiSi2 composite; noble-metal free; visible light; photocatalyst; hydrogen evolution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chu, D.; Zhang, C.; Yang, P.; Du, Y.; Lu, C. WS2 as an Effective Noble-Metal Free Cocatalyst Modified TiSi2 for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation. Catalysts 2016, 6, 136.

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