“…Since chalcogenides possess the potential for thermoelectric, magnetic and photocatalytic applications, they have been thoroughly researched as photovoltaic devices. 31–34 Their vast applications result in the development of novel nanostructured materials having unique morphologies and diverse sizes. When metal chalcogenides are decreased to the nanoscale, their new chemical and physical features give a quantum size effect 35,36 However, the disadvantage of metal-S linkages in photo-electrocatalysts is due to weaker H-atom adsorption, which demonstrates a slow Volmer step reaction (H 2 O + e − → H ads + OH), 37 consequently leading to poor kinetics of the water splitting reaction as well as photo-corrosion of the metal-S linkage.…”