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Singh, Aadesh P.
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article
Synthesis of MoS<sub>2</sub>-TiO<sub>2</sub> nanocomposite for enhanced photocatalytic and photoelectrochemical performance under visible light irradiation
Abstract
In this work, we have prepared MoS<sub>2</sub> nanoflakes modified TiO<sub>2</sub> nanoparticles (MoS<sub>2</sub>-TiO<sub>2</sub> nanocomposite) with varying concentration of MoS<sub>2</sub> (2.5–10 wt.%) by a two-step hydrothermal synthesis method involving specific preparation conditions for the TiO<sub>2</sub> nanoparticles and MoS<sub>2</sub> nanoflakes. The prepared samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and X-ray photoelectron spectroscopy (XPS) techniques. The photocatalytic activity of the pristine TiO<sub>2</sub> nanoparticles and MoS<sub>2</sub>-TiO<sub>2</sub> nanocomposite samples were evaluated by examining the photocatalytic degradation of Rhodamine B (RhB). The photoelectrochemical activity of these samples were measured by performing solar water splitting experiments under visible light irradiation. It was observed that the MoS<sub>2</sub>-TiO<sub>2</sub> nanocomposite with 7.5 wt.% MoS<sub>2</sub> exhibits highest photocatalytic and photoelectrochemical activity as it has the optimum amount of MoS<sub>2</sub> nanoflakes which probably minimizes the recombination of photogenerated charge carriers as compared to other concentrations of MoS<sub>2</sub> in MoS<sub>2</sub>-TiO<sub>2</sub> nanocomposite and pristine TiO<sub>2</sub> nanoparticles. In addition, a rather high photocatalytic reaction rate constant was observed for MoS<sub>2</sub>-TiO<sub>2</sub> nanocomposite with 7.5 wt.% MoS<sub>2</sub> nanoflakes.