Layered WS2/WO3 Z-scheme photocatalyst constructed via an in situ sulfurization of hydrous WO3 nanoplates for efficient H2 generation

被引:51
作者
Zhang, Shuai [1 ,2 ]
Chen, Shengtao [1 ,2 ]
Liu, Dong [1 ,2 ]
Zhang, Jing [1 ]
Peng, Tianyou [1 ,2 ]
机构
[1] Wuhan Univ, Coll Chem & Mol Sci, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China
[2] Wuhan Univ, Wuhan Univ Shenzhen, Res Inst, Shenzhen 518057, Peoples R China
基金
中国国家自然科学基金;
关键词
WS2/WO3; heterostructure; Photocatalysis; Z-scheme mechanism; Hydrogen generation; Sulfurization process; THIN-FILMS; CONTROLLED FABRICATION; HOLLOW MICROSPHERES; EVOLUTION; WS2; WATER; PERFORMANCE; COMPOSITE; HETEROSTRUCTURES; HETEROJUNCTION;
D O I
10.1016/j.apsusc.2020.147013
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Solar-driven H-2 production over Z-scheme photocatalysts to mimic the natural photosynthesis represents a promising approach to the production of clean hydrogen energy. However, fabrication of Z-scheme heterostructures with intimate interfacial contact and smooth charge transfer for efficient H-2 generation is still challenging. Herein, a series of layered WS2/WO3 heterostructures containing monoclinic WO3 (m-WO3) nanoplates and few-layer hexagonal WS2 with 2H structure (2H-WS2) is constructed via an in situ sulfurization process of hydrous WO3 nanoplates. The electronic interaction between the two moieties (2H-WS2 and m-WO3) follows a direct Z-scheme mechanism to retard the charge recombination without weakening the redox ability of the photoexcited charge carriers of the WS2/WO3 heterostructures. Moreover, the few-layer 2H-WS2 with thickness of similar to 4.2 nm and intimate interfacial contact between 2H-WS2 and m-WO3 due to the "S-W-O" transition layer can further provide shortened charge migration path and smooth interfacial charge transfer, which in turn enables the effective operation of the Z-scheme mechanism. Therefore, the WS2/WO3 Z-scheme photocatalyst with an optimal component ratio delivers ca. 5 times higher H-2 generation activity than the few-layer 2H-WS2 alone. The present work offers a promising strategy to construct integrated nanostructured heterostructures with intimate interfacial contact, smooth charge transfer and improved photocatalytic performance.
引用
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页数:12
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