Understanding the efficient electrocatalytic activities of MoSe₂–Cu₂S nanoheterostructures

Abstract

The electrocatalytic water splitting activity of layered transition metal dichalcogenides (TMDs) is limited by inert basal planes and slower reaction kinetics. Here, we demonstrate the use of MoSe2–Cu2S nanoheterostructures (NHSs)...

MoSe2/SnS Nanoheterostructures for Water Splitting

“…These peaks are assigned according to the provided references. ,, The XPS spectra of O 1s show the increase in the intensity of the M–OH peak, and the presence of the most intense peak corresponding to M–OOH after catalysis suggests that M–OH and M–OOH species are prominent at the surface. M–OH and M–OOH are the intermediates and the true catalytically active species formed in situ during the electrocatalytic multistep OER process in the case of chalcogenide-based electrocatalysts. ,,,, This has also been seen to be the case in our previous studies on MoSe 2 -Cu 2 S NHS …”

“…For reference, similar calculations were also performed for the pure SnS NS. We calculated the energy change for the various intermediates formed during the OER over the catalyst surface . According to the reaction energetics in Figure , it is evident that the transformation from adsorbed O* to OOH* is the most energy-demanding step.…”

“…The energy change for various steps in HER was calculated and is provided in Figure . HER in alkaline medium occurs in four steps, and the calculations for each step at the surface of the catalyst were carried out . HER was considered on the MoSe 2 surface for MoSe 2 /SnS NHS, and for reference, the calculations for each step were also simulated on the pure MoSe 2 surface.…”

NiSe/Ni3Se2 on nickel foam as an ultra-high-rate HER electrocatalyst: common anion heterostructure with built-in electric field and efficient interfacial charge transfer

“…5d) and hence enhances the HER catalytic activity. 30,34 Furthermore, NiSe/ Ni 3 Se 2 belongs to a unique type of common-anion heterovalentcommon-cation heterojunction, which possesses ample Ni-Se bonds (Fig. 5d) across the interface to reduce the interfacial charge transfer resistance.…”

Fabrication of tailored rod-shaped carbon nitride, g-C3N4, decorated with MoSe2 flowers for the catalytic reduction of nitrophenol, organic dye degradation and biocompatibility studies

“…A 3D flower-like nano structured MoSe 2 formed with its layered flakes offers superior performance in catalysis owing to the presence of abundant active sites at the edge of nanosheets of MoSe 2 flowers. [29][30][31][32] There are very few reports on g-C 3 N 4 /MoSe 2 composites in photocatalytic H 2 production reaction, 28,33 degradation, 34 and ammonia formation. 35 The catalytic degradation of RhB dye and reduction of 4-NP using g-C 3 N 4 /MoSe 2 have not yet been reported, to the best of our knowledge.…”