Production and Properties of Molybdenum Disulfide/Graphene Oxide Hybrid Nanostructures for Catalytic Applications

Abstract

Molybdenum disulfide (MoS2) can be an excellent candidate for being combined with carbon nanomaterials to obtain new hybrid nanostructures with outstanding properties, including higher catalytic activity. The aim of the conducted research was to develop the novel production method of hybrid nanostructures formed from MoS2 and graphene oxide (GO). The nanostructures were synthesized in different weight ratios and in two types of reactors (i.e., impinging jet and semi-batch reactors). Physicochemical analysis of the obtained materials was carried out, using various analytical techniques: particle size distribution (PSD), thermogravimetric analysis (TGA), FT-IR spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Due to the potential application of materials based on MoS2 as the catalyst for hydrogen evolution reaction, linear sweep voltammetry (LSV) of the commercial MoS2, synthesized MoS2 and the obtained hybrid nanostructures was performed using a three-electrode system. The results show that the developed synthesis of hybrid MoS2/GO nanostructures in continuous reactors is a novel and facile method for obtaining products with desired properties. The hybrid nanostructures have shown better electrochemical properties and higher onset potentials compared to MoS2 nanoparticles. The results indicate that the addition of carbon nanomaterials during the synthesis improves the activity and stability of the MoS2 nanoparticles.

Large-scale synthesis of 2D-silica (SiOx) nanosheets using graphene oxide (GO) as a template material

“…3a). The peaks corresponded to the functional carbonyl-, conjugated carboncarbon, and carbon-oxygen groups (bond stretching) at 1710-1720, 1618 and 1050-1150 cm −1 , respectively, 42,43 although at relatively low intensity compared to the large shoulder present in the range 3000-3500 cm −1 , which was associated with the adsorbed water and the hydroxyl groups (O-H bond stretching). 44 After high-temperature thermal treat- ment at 586 °C, the formed pure SiO x -sheets had in common the formation of a more uniform strong peak at ca.…”

Reducing emissions of exhaust particles using the synergy of molybdenum disulfide and carbon nanotubes in engine oil additives

“…Hybrid nanostructures based on molybdenum disul de and multiwalled CNTs, MoS 2 /CNTs, were synthesized via wet chemical precipitation in an impinging jet reactor, as described in [4,19]. First, 8.828 g of ammonium heptamolybdate tetrahydrate (Merck Millipore, extra pure powder) was added to a small amount of deionized (DI) water (~ 100 mL) in a 250 ml volumetric ask.…”

“…A promising approach for enhancing oil lubricating properties is to use a combination of these two unique materials to bene t from their synergistic effects. Song In our previous study, we precipitated MoS 2 nanoparticles on various carbon nanomaterial surfaces using a facile and scalable method [4,8,19]. The obtained hybrid nanostructures, including MoS 2 /CNTs, were tested as engine oil nanoadditives.…”

Reducing particulate emissions by using advanced engine oil nanoadditives based on molybdenum disulfide and carbon nanotubes

“…In our previous study, we precipitated MoS 2 nanoparticles on various carbon nanomaterial surfaces using a facile and scalable method 5 , 9 , 20 . The obtained hybrid nanostructures, including MoS 2 /CNTs, were tested as engine oil nanoadditives.…”