WS2/Graphitic Carbon Nitride Heterojunction Nanosheets Decorated with CdS Quantum Dots for Photocatalytic Hydrogen Production,ChemSusChem

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WS2/Graphitic Carbon Nitride Heterojunction Nanosheets Decorated with CdS Quantum Dots for Photocatalytic Hydrogen Production
ChemSusChem ( IF 7.5 ) Pub Date : 2018-03-09 , DOI: 10.1002/cssc.201800053
Yajun Zou ₁ , Jian-Wen Shi _{1,

2} , Dandan Ma ₁ , Zhaoyang Fan ₁ , Linhao Cheng ₁ , Diankun Sun ₁ , Zeyan Wang ₂ , Chunming Niu ₁

Affiliation

Two‐dimensional/two‐dimensional (2D/2D) stacking heterostructures are highly desirable in fabricating efficient photocatalysts because face‐to‐face contact can provide a maximized interfacial region between the two semiconductors; this largely facilitates the migration of charge carriers. Herein, a WS₂/graphitic carbon nitride (CN) 2D/2D nanosheet heterostructure decorated with CdS quantum dots (QDs) has been designed, for the first time. Optimized CdS/WS₂/CN without another cocatalyst exhibits a significantly enhanced photocatalytic H₂ evolution rate of 1174.5 μmol h⁻¹ g⁻¹ under visible‐light irradiation (λ>420 nm), which is nearly 67 times higher than that of the pure CN nanosheets. The improved photocatalytic activity can be primarily attributed to the highly efficient charge‐transfer pathways built among the three components, which effectively accelerate the separation and transfer of photogenerated electrons and holes, and thus, inhibit their recombination. Moreover, the extended light‐absorption range also contributes to excellent photocatalytic efficiency. In addition, the CdS/WS₂/CN photocatalyst shows excellent stability and reusability without apparent decay in the photocatalytic H₂ evolution within 4 cycles in 20 h. It is believed that this work may shed light on specifically designed 2D/2D nanosheet heterostructures for more efficient visible‐light‐driven photocatalysts.

中文翻译：

用CdS量子点修饰的WS2 /石墨化碳氮化物异质结纳米片，用于光催化制氢

二维/二维（2D / 2D）堆叠异质结构在制造有效的光催化剂方面是非常理想的，因为面对面接触可以在两个半导体之间提供最大的界面区域。这极大地促进了电荷载流子的迁移。本文中，首次设计了用CdS量子点（QD）装饰的WS ₂ /石墨化碳氮化物（CN）2D / 2D纳米片异质结构。优化的CdS / WS ₂ / CN而不另一助催化剂呈现显著增强光催化ħ ₂的1174.5微摩尔ħ进化速率^-1 克^-1可见光照射下（λ> 420 nm），几乎是纯CN纳米片的67倍。改善的光催化活性主要归因于在这三个成分之间建立的高效电荷转移途径，该途径有效地加速了光生电子和空穴的分离和转移，从而抑制了它们的重组。此外，扩大的光吸收范围也有助于出色的光催化效率。此外，CdS / WS ₂ / CN光催化剂在20小时内的4个循环中显示出出色的稳定性和可重复使用性，而光催化H _2的放出没有明显的衰减。可以相信，这项工作可能会为专门设计的2D / 2D纳米片异质结构提供启示，以实现更有效的可见光驱动的光催化剂。

更新日期：2018-03-09

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