Abstract
Three component hybrid (MoS2-TiO2)/Au substrate is fabricated by loading plasmonic Au nanorods on the MoS2 nanosheets coated TiO2 nanorod arrays. It is used for photoelectrochemical (PEC) cell and photocatalyst for hydrogen generation. Owing to the charge transfer between the MoS2-TiO2 hetero-structure, the PEC current density and hydrogen generation of TiO2 nanoarrays are enhanced 2.8 and 2.6 times. The broadband photochemical properties are further enhanced after Au nanorods loading. The plasmon resonance of Au nanorods provides more effective light-harvesting, induces hot-electron injection, and accelerates photo-excited charges separation. The results have suggested a route to construct nanohybrid by combining one-dimensional arrays and two-dimensional nanosheets, meanwhile have successfully utilized plasmonic nanorods as a sensitizer to improve the photochemical properties of the semiconductor nanocomposite.
Highlights
As a member of layered two-dimensional material, molybdenum disulfide (MoS2) is promising for the applications in energy and environment[1,2,3,4,5,6,7,8,9,10]
Gold nanoparticles (NPs) supporting tunable surface plasmon resonance in a wide region have been used for various light-matter interaction enhancement[37,38,39,40,41], in which the main mechanism are broadening light-harvesting region and facilitating the charge separation[42,43,44,45,46,47]
We report a three component hybrid (MoS2-TiO2)/Au including two-dimensional MoS2 nanosheets, self-ordered TiO2 nanorod arrays, and plasmonic Au nanorods
Summary
As a member of layered two-dimensional material, molybdenum disulfide (MoS2) is promising for the applications in energy and environment[1,2,3,4,5,6,7,8,9,10]. The two-dimensional structure provides large contact interface and efficient charge transfer, as a result, the layered MoS2 nanosheets have been regarded as a low-cost co-catalyst candidate resently[15,16,17,18,19,20,21,22]. The interface charge transfer between MoS2-TiO2 hetero-junction would accelerate the charge separation and enhance photocatalytic activity and increase the hydrogen generation[28,29,30,31,32,33,34,35,36]. Xing-Hua Xia et al reported an efficient water splitting hydrogen evolution reaction of Au nanorods/MoS2 nanosheets hybrids through increase the carrier density in MoS2 by Au nanorods[49]. The physical mechanisms of enhanced light-harvesting, hot electrons injection, and acceleration of separation of photo-excited charges are further discussed
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