Influence of MoS2 on Activity and Stability of Carbon Nitride in Photocatalytic Hydrogen Production

Abstract

MoS2/C3N4 (MS-CN) composite photocatalysts have been synthesized by three different methods, i.e., in situ-photodeposition, sonochemical, and thermal decomposition. The crystal structure, optical properties, chemical composition, microstructure, and electron transfer properties were investigated by X-ray diffraction, UV-vis diffuse reflectance spectroyscopy, X-ray photoelectron spectroscopy, electron microscopy, photoluminescence, and in situ electron paramagnetic resonance spectroscopy. During photodeposition, the 2H MoS2 phase was formed upon reduction of [MoS4]2− by photogenerated conduction band electrons and then deposited on the surface of CN. A thin crystalline layer of 2H MoS2 formed an intimate interfacial contact with CN that favors charge separation and enhances the photocatalytic activity. The 2H MS-CN phase showed the highest photocatalytic H2 evolution rate (2342 μmol h−1 g−1, 25 mg catalyst/reaction) under UV-vis light irradiation in the presence of lactic acid as sacrificial reagent and Pt as cocatalyst.

A molybdenum disulfide/nickel ferrite-modified voltammetric sensing platform for ultra-sensitive determination of clenbuterol under the presence of an external magnetic field

“…01-075-1539 in ICDD card). 33 Fig. 1b has eight characteristic peaks of the NFO NPs with planes of (111), (220), (311), (222), (400), (422), (511), and (440), respectively – ICDD card no.…”

In Situ Generation of Ultrathin MoS2 Nanosheets in Carbon Matrix for High Energy Density Photo‐Responsive Supercapacitors

“…Apparently, efficient separation of photo‐generated electrons and holes occurs in MoS 2 @carbon. [ 30 ] Probably, incorporating MoS 2 in the carbon matrix, as well as the formation of C‐Mo bond facilitates the carrier transfer. We further monitored the CV curves evolution of MoS 2 @carbon during the switching of UV light.…”

In Situ Wet Etching of MoS2@dWO3 Heterostructure as Ultra-Stable Highly Active Electrocatalyst for Hydrogen Evolution Reaction

“…Though many literatures have been reported the great potential of MoS 2 as HER electrocatalyst [3,21,22], the severe stacking of MoS 2 nanosheets during the preparation and electrochemical reaction process significantly impact its stability and hinders its application compared with Pt-based electrocatalysts [21,23]. Therefore, unless the electronic structure can be appropriately modulated by varying the chemical constituents [18] to increase the population of active sites [17] or introducing durable supportive materials [5,24] to prevent the aggregation, the 2D layered MoS 2 could hardly be employed into practical application without long-term stability [25].…”

“…Tungsten trioxide (WO 3 ) is another distinctive 2D layered oxide [26] with faster proton insertion kinetics than other two-dimensional transition metal chalcogenides, attributing to its larger proton diffusion coefficient [9]. Recently, improving the HER performance by designing and constructing various nanostructure components has been considered an available strategy to remarkably increase the active edge sites [25,27] and improve the long-term stability [28]. Indeed, researchers have reported that regulating the interlayer spacing of MoS 2 nanosheets by forming hetero-structure can optimize the HER performance [29][30][31].…”