期刊
APPLIED SURFACE SCIENCE
卷 430, 期 -, 页码 523-530出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2017.07.292
关键词
MoS2/CdS composite; Cocatalyst; Photocatalytic H-2 evolution activity; Charge separation
类别
资金
- National Natural Science Foundation of China [51302200]
- Research and Innovation Initiatives of Wuhan Polytechnic University [2017y17]
The MoS2/CdS composites with layered MoS2 loaded on uniform CdS nanospheres were synthesized by a two-step process combination hydrothermal and solvothermal treatments, and then applied in photocatalytic hydrogen evolution under visible light irradiation. The as-prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectrometer (EDS), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Raman spectra, UV-vis diffuse reflectance absorption spectra (UV-DRS), nitrogen adsorption-desorption measurement, photoluminescence spectra (PL) and photoelectrochemical tests. The effects of loading contents of MoS2 in the composites on the photocatalytic H-2 evolution activity were comparatively investigated with 0.45 mol L-1 Na2S and 0.55 mol L-1 Na2SO3 as sacrificial agents. The results showed that the 5 wt% MoS2/CdS composite could achieve the highest photocatalytic H-2 evolution rate of 372 mu mol h(-1) and apparent quantum efficiency (AQE) about 7.31% under 420 nm monochromatic light irradiation. The remarkably enhanced photocatalytic activity of MoS2/CdS composite could be attributed to the effective transfer and separation of photogenerated charge carriers, and MoS2 being as a cocatalyst to facilitating photocatalytic H-2 evolution reaction. A tentative mechanism of MoS2/CdS composites as photocatalysts for H-2 evolution was proposed. (C) 2017 Published by Elsevier B.V.
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