MoS2@ZnO Nanoheterostructures Prepared by Electrospark Erosion for Photocatalytic Applications

Abstract

MoS2@ZnO nanoheterostructures were synthesized by electrospark erosion of zinc granules in a hydrogen peroxide solution and simultaneous addition of MoS2 nanostructured powder into the reaction zone. The morphology, size of the crystallites, as well as elemental and phase composition of the prepared structures, were examined using transmission electron microscopy and X-ray diffraction analysis. It was found that the synthesized products represent heterostructures containing MoS2 nanoparticles formed on ZnO nanoparticles. Raman spectroscopy and photoluminescence analysis were also used for characterization of the prepared heterostructures. The obtained MoS2@ZnO nanostructures revealed an intense broad emission band ranging from 425 to 625 nm for samples with different fractions of MoS2. Photocatalytic measurements showed that the maximal hydrogen evolution rate of the prepared nanoheterostructures was about 906.6 μmol·g−1·h−1. The potential of their application in photocatalytic water splitting was also estimated.

Highly efficient degradation of tetracycline by activated peroxymonosulfate over MoS2/ZnO heterostructure nanocomposites

“…56 This obviously shows that the combination of ZnO and MoS 2 is beneficial for reducing the resistance of the nanocomposite, and improving the transfer efficiency of photogenerated carriers. 49 Moreover, the instantaneous photocurrent response of MZ-15 in Fig. 8b surpasses that of ZnO and MoS 2 , indicating that MZ-15 has the lowest photogenerated electron–hole recombination rate.…”

“…48 The XRD pattern of the MoS 2 /ZnO heterostructure exhibited characteristic peaks from both MoS 2 and ZnO, indicating that the introduction of MoS 2 into ZnO did not change the crystal structure of ZnO. 49 However, the diffraction peaks of MoS 2 Scheme 1 Illustration for the fabrication of MoS 2 /ZnO composites. were relatively weak, which can be attributed to the low content of MoS 2 and its high dispersion within the sample.…”

Development of MoS2-ZnO heterostructures: an efficient bifunctional catalyst for the detection of glucose and degradation of toxic organic dyes

“…The improved efficiencies may be because structural defects 87,88 in the heterostructure provide more trapping sites for the electrons and delay the recombination process of electron (e À )-hole (h + ) pairs and ultimately trigger the degradation of organic dyes. 89 The wrapped and curved nanosheets provide a large surface area and interspaces which is very suitable for an efficient catalytic reaction. The interaction between MoS 2 nanosheets and ZnO induces charge transfer from ZnO to MoS 2 and increases the efficiency of charge separation of the photogenerated electron-hole pairs.…”