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Hydrogenated MoS2 QDs-TiO2 Heterojunction Mediated Efficient Solar Hydrogen Production

Abstract

Herein, we report the development of hydrogenated MoS2 QDs- TiO2 (HMT) heterojunction as an efficient photocatalytic system via one-pot hydrothermal reaction followed by hydrogenation. Synthetic strategy facilitates the formation of MoS2 QDs with enhanced band gap and its proper heterojunction with TiO2, which accelerates the fast charge transfer and separation. Hydrogenation leads to oxygen vacancies in TiO2, enhancing the visible light absorption capacity through narrowing its band gap, and sulfur vacancies in MoS2, which enhance active sites for hydrogen adsorption. Due to the band gap reduction of hydrogenated TiO2 and band gap enhancement of MoS2 QD, the energy gap between CB of T-H2 and VB of MoS2 QDs reduced reasonably and enabled the recombination of corresponding photogenerated electrons and holes, keeping separated free holes at MoS2 QDs VB and free electrons at T-H2 CB. It showed stable, efficient and exceptionally high noble metal free sunlight-induced hydrogen production with a maximum rate of 3.1 mmolg-1h-1. The developed synthetic strategy also provides flexibility towards shape of MoS2, e.g., QDs / single or few layers, on TiO2 and offers the opportunity to design novel visible light active photocatalyst for different applications.

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Publication details

The article was received on 01 Sep 2017, accepted on 12 Oct 2017 and first published on 12 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR06526D
Citation: Nanoscale, 2017, Accepted Manuscript
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    Hydrogenated MoS2 QDs-TiO2 Heterojunction Mediated Efficient Solar Hydrogen Production

    A. Saha, A. Sinhamahapatra, T. Kang, S. C. Ghosh, J. Yu and A. B. Panda, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06526D

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