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MoS2 as non-noble-metal co-catalyst for photocatalytic hydrogen evolution over hexagonal ZnIn2S4 under visible light irradiations

Paper ID Volume ID Publish Year Pages File Format Full-Text
45389 46410 2014 7 PDF Available
Title
MoS2 as non-noble-metal co-catalyst for photocatalytic hydrogen evolution over hexagonal ZnIn2S4 under visible light irradiations
Abstract

•MoS2/ZnIn2S4 were prepared by impregnating (NH4)2MoS4 solution on ZnIn2S4, followed by a treatment in H2S flow at high temperatures to transform Mo(VI) to Mo(IV).•MoS2/ZnIn2S4 show efficiently photocatalytic hydrogen activity, and can be even higher than that of Pt/ZnIn2S4.•Amorphous MoS2 was shown to exhibit excellent promoting effect for photocatalytic hydrogen evolution.

MoS2/ZnIn2S4 nanocomposites were prepared by impregnating the hydrothermally prepared hexagonal ZnIn2S4 microspheres with an aqueous solution of (NH4)2MoS4, followed by a treatment in H2S flow at high temperatures to transform Mo(VI) to Mo(IV). The as-prepared MoS2/ZnIn2S4 nanocomposites were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). Their photocatalytic performance for hydrogen evolution under visible light irradiations was also investigated. It was found that the photocatalytic hydrogen evolution activity over hexagonal ZnIn2S4 can be significantly increased by loading MoS2 as a co-catalyst and the photocatalytic activity of MoS2/ZnIn2S4 nanocomposites could be even higher than that of Pt/ZnIn2S4 under similar reaction condition. Amorphous MoS2 was for the first time shown to exhibit excellent promoting effect for photocatalytic hydrogen evolution. The promoting effect played by amorphous MoS2 can be ascribed to the existence of many defect sites in amorphous MoS2 which can act as adsorption sites for hydrogen atoms and eventually leads to hydrogen evolution. This work demonstrates a high potential of the developing of environmental friendly, cheap noble metal-free co-catalyst for semiconductor-based photocatalytic hydrogen evolution.

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Keywords
MoS2; Co-catalyst; Photocatalytic; Hydrogen evolution; Visible light
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MoS2 as non-noble-metal co-catalyst for photocatalytic hydrogen evolution over hexagonal ZnIn2S4 under visible light irradiations
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 521–527
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us