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Stable 1T-phase MoS as an effective electron mediator promoting photocatalytic hydrogen production

Nanoscale, ISSN: 2040-3372, Vol: 10, Issue: 19, Page: 9292-9303
2018
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Article Description

Coupling two semiconductors together to construct a Z-scheme type photocatalytic system is an efficient strategy to solve the serious recombination challenge of photogenerated electrons and holes. In this work, we develop a novel composite photocatalyst by sandwiching metallic 1T-phase MoS nanosheets between MoO and g-CN (MoO/1T-MoS/g-CN) for the first time. The metallic 1T-phase MoS acts as an efficient electron mediator between MoO and g-CN to construct an all-solid-state Z-scheme photocatalytic system, resulting in a highly-efficient spatial charge separation and transfer process. Benefiting from this, the newly developed MoO/1T-MoS/g-CN exhibits a drastically enhanced photocatalytic H evolution rate of 513.0 μmol h g under visible light irradiation (>420 nm), which is nearly 12 times higher than that of the pure g-CN (39.5 μmol h g), and 3.5 times higher than that of MoO/g-CN (145.7 μmol h g). More importantly, the originally unstable 1T-phase MoS becomes very stable in MoO/1T-MoS/g-CN because of the sandwich structure where 1T-phase MoS is protected by MoO and g-CN, which endows the photocatalyst with excellent photostability. It is believed that this study will provide new insights into the design of efficient and stable Z-scheme heterostructures for photocatalytic applications.

Bibliographic Details

Shi, Jian-Wen; Zou, Yajun; Ma, Dandan; Fan, Zhaoyang; Cheng, Linhao; Sun, Diankun; Wang, Zeyan; Niu, Chunming; Wang, Lianzhou

Royal Society of Chemistry (RSC)

Materials Science

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