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Journal of Organic & Inorganic Chemistry
ISSN 2472-1123
2
n d
E d i t i o n o f E u r o S c i C o n C o n f e r e n c e o n
Chemistry
F e b r u a r y 1 9 - 2 0 , 2 0 1 9
P r a g u e , C z e c h R e p u b l i c
Chemistry 2019
I
n a typical photocatalytic reaction, efficient solar light harvesting and charge generation, as well as effective charge transport,
are key factors that determine the efficiency of the photocatalytic system for H2 production. Atomically layered heterostructures
have attracted significant research interest due to their unique layer-dependent catalysis and electronic properties. Previous
studies have reported that the catalytic properties of MoS2 layered materials are highly dependent on the number of layers, and
the difficulty of controlling the number of layers over a substrate has been a bottleneck for widespread use. Therefore, developing
a simple, facile and environmentally friendly method to fabricate van der Waals heterostructures (vdWHs) with precisely controlled
MoS2 layers for achieving highly efficient H2 generation is still a challenge. Here, we report for the first time that the H2 bubbles
generated by photocatalytic water splitting are effective in the layer-by-layer exfoliation of MoS2 nanocrystals (NCs) into few
layers (Figure 1). The as obtained few layers can be
in situ
assembled with CdS nanosheets (NSs) into vdWHs of few-layered
MoS2/CdS NSs which, in turn, are effective in charge separation and transfer, leading to enhanced photocatalytic H2 production
activity. The few-layered MoS2/CdS vdWHs exhibited a H2 evolution rate of 140 mmol g(CdS)-1 h-1 and achieved an apparent
quantum yield of 66% at 420 nm. This study provides a new strategy for the design of noble-metal-free few-layered MoS2/CdS
vdWH systems for photocatalytic H2 generation. We believe that this bubble exfoliation strategy can be extended to a range of
other layered transition metal dichalcogenide compounds
shahidiqbal@mail.xjtu.edu.cnControlled synthesis and layer-number-
dependent catalytic properties of few-layered
MoS
2
/CdS van der Waals heterostructures for
efficient photocatalytic H
2
evolution
Shahid Iqbal
Xi'an Jiaotong University, China
Figure 1
: Schematic illustration of the exfoliation of MoS2 nanocrystals and
the fabrication of vdWHs of few-layered MoS2/CdS nanosheets by bubble
exfoliation
J Org Inorg Chem 2019, Volume: 5
DOI: 10.21767/2472-1123-C1-021