Journal
CHEMSUSCHEM
Volume 11, Issue 7, Pages 1187-1197Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201800053
Keywords
interfaces; photochemistry; quantum dots; semiconductors; water splitting
Funding
- National Natural Science Fund Committee-Baosteel Group Corporation Steel Joint Research Fund, China [U1460105]
- National Science Foundation of China [51521065]
- State Key Laboratory of Crystal Materials, Shandong University, China [KF1710]
- State Key Laboratory of Electrical Insulation and Power Equipment (Xi'an Jiaotong University) [EIPE18311]
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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 H-2 evolution rate of 1174.5 mu molh(-1)g(-1) under visible-light irradiation (lambda > 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 H-2 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.
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