Stable 1T-phase MoS2 as an effective electron mediator promoting photocatalytic hydrogen production†,Nanoscale

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Stable 1T-phase MoS2 as an effective electron mediator promoting photocatalytic hydrogen production†
Nanoscale ( IF 5.8 ) Pub Date : 2018-04-12 00:00:00 , DOI: 10.1039/c8nr00017d
Jian-Wen Shi _{1,

2,

3,

4,

5} , Yajun Zou _{1,

2,

3,

4,

5} , Dandan Ma _{1,

2,

3,

4,

5} , Zhaoyang Fan _{1,

2,

3,

4,

5} , Linhao Cheng _{1,

2,

3,

4,

5} , Diankun Sun _{1,

2,

3,

4,

5} , Zeyan Wang _{6,

7,

8,

9} , Chunming Niu _{1,

2,

3,

4,

5} , Lianzhou Wang _{10,

11,

12,

13,

14}

Affiliation

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 MoS₂ nanosheets between MoO₃ and g-C₃N₄ (MoO₃/1T-MoS₂/g-C₃N₄) for the first time. The metallic 1T-phase MoS₂ acts as an efficient electron mediator between MoO₃ and g-C₃N₄ 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 MoO₃/1T-MoS₂/g-C₃N₄ exhibits a drastically enhanced photocatalytic H₂ evolution rate of 513.0 μmol h⁻¹ g⁻¹ under visible light irradiation (>420 nm), which is nearly 12 times higher than that of the pure g-C₃N₄ (39.5 μmol h⁻¹ g⁻¹), and 3.5 times higher than that of MoO₃/g-C₃N₄ (145.7 μmol h⁻¹ g⁻¹). More importantly, the originally unstable 1T-phase MoS₂ becomes very stable in MoO₃/1T-MoS₂/g-C₃N₄ because of the sandwich structure where 1T-phase MoS₂ is protected by MoO₃ and g-C₃N₄, 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.

中文翻译：

稳定的1T相MoS ₂作为促进光催化制氢的有效电子介体†

将两个半导体耦合在一起以构建Z方案类型的光催化系统是解决光生电子和空穴严重复合挑战的有效策略。在这项工作中，我们首次通过将金属1T相MoS ₂纳米片夹在MoO ₃和gC ₃ N ₄（MoO ₃ / 1T-MoS ₂ / gC ₃ N ₄）之间来开发新型复合光催化剂。金属1T相MoS ₂充当MoO ₃和gC ₃ N ₄之间的有效电子介体，以构建全固态Z-方案的光催化系统，导致高效的空间电荷分离和转移过程。受益于此，新开发的MoO ₃ / 1T-MoS ₂ / gC ₃ N ₄在可见光辐射（> 420 nm）下显示出513.0μmolh ^-1 g ^-1的光催化H ₂放出速率大大提高，接近12倍比纯GC的更高₃ ñ ₄（39.5微摩尔ħ ^-1克^-1），和比的MoO的3.5倍更高₃ / GC ₃ ñ ₄（145.7微摩尔ħ ^-1克^-1）。更重要的是，本来不稳定的1T-相的MoS₂变得非常稳定在的MoO₃ / 1T-MOS₂ / GC₃ Ñ₄因为其中1T相的MoS夹层结构的₂通过的MoO保护₃和GC₃ Ñ₄，其使光催化剂具有优异的光稳定性。相信该研究将为光催化应用的有效和稳定的Z-方案异质结构的设计提供新的见解。

更新日期：2018-04-12

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