Synergistic effect of PtSe₂ and graphene sheets supported by TiO₂ as cocatalysts synthesized via microwave techniques for improved photocatalytic activity

Abstract

Here we report a new composite material consisting of TiO 2 nanoparticles grown in the presence of a layered PtSe 2 /graphene hybrid as a high-performance photocatalytic material. The heterogeneous PtSe 2 -graphene/TiO 2 nanocomposites were successfully synthesized through a facile and fast microwaveassisted method. The prepared composites were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) spectroscopy, transmission electron microscopy (TEM), Raman spectroscopic analysis, X-ray photoelectron spectroscopy (XPS), and UV-vis absorbance spectra and UV-vis diffuse reflectance spectra (DRS) analyses were obtained. The catalytic behavior was investigated through the decomposition of rhodamine B (Rh. B) as a standard dye and Texbrite MST-L as an industrial dye. This extraordinary photocatalytic activity arises from the positive synergetic effect between the PtSe 2 and graphene components in this heterogeneous photocatalyst. In this study the graphene behaves as an electron transfer agent, collector, contributor and a source of active adsorption sites. The optical properties were also observed to be affected by the different weight% of graphene in the composites by observing their respective band gaps from DRS spectra.

Two-Dimensional Platinum Diselenide: Synthesis, Emerging Applications, and Future Challenges

“…In addition to the aforementioned methods, some other approaches also have been reported to synthesize 2D PtSe 2 . For example, some pioneer works have been reported that PtSe 2 can be prepared via a Sol-Gel solution process [130][131][132][133][134]. Umar et al [135] reported the successful synthesis of scalable 2D PtSe 2 nanosheets via an aqueous-phase synthetic strategy for the first time.…”

Microwave synthesis of a CoSe2/graphene–TiO2 heterostructure for improved hydrogen evolution from aqueous solutions in the presence of sacrificial agents

“…These polar solvents absorb microwave energy and limit localized heating and causes decomposition The advantage of microwave synthesis are, i.e., short reaction time, saving of long usage of power, extra cooled water for reflux and closed vessel to release minimum toxic gases to environment [17][18][19]. As it is already known that microwave radiation need a polar solvent for synthesis of nanomaterials.…”

Raman characterization of platinum diselenide thin films

“…Additionally, PtSe 2 has previously been synthesized by chemical means for use in graphene hybrid materials 10 and has been theoretically predicted to be a highperformance photo-catalyst 11 . While Raman spectroscopy is used extensively for the characterization of TMDs and other nanomaterials, the Raman characteristics of PtSe 2 have not previously been reported.…”