A new heterojunction in photocatalysis: S-scheme heterojunction

A New Allotrope of Carbon—Graphdiyne (g‐CnH2n−2) Boosting with Mn0.2Cd0.8S form S‐Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

“…It is worth mentioning that, compared with the traditional type II heterojunction, the S‐scheme transfer mechanism can accelerate the photogenerated carrier transfer rate and retain the strong redox ability of the catalyst as much as possible. [ 23 ] The S‐scheme mechanism is not only theoretically feasible but also be supported by numerous experimental results. [ 24 ] For example, Fu et al.…”

The Influence of Photocatalytic Reactors Design and Operating Parameters on the Wastewater Organic Pollutants Removal—A Mini-Review

“…The multi-component photocatalyst, called heterostructures, benefit from the extended light spectra being able to use UV, visible or near infra-red photoexcitation depending on their energy band gaps values and ability to produce oxidative radicals involved in organic pollutants removal. The heterostructure can follow several mechanisms: type I junctions [47], type II junctions [48], Schottky junctions [49], Z-scheme mechanism [50] or S-scheme mechanisms [51]. These heterostructures contain at least two semiconductors with suitable position of energy bands, excepting Schottky junction, which may include one semiconductor coupled with a metal.…”

A novel BiVO3/SnO2 step S-scheme nano-heterojunction for an enhanced visible light photocatalytic degradation of amaranth dye and hydrogen production

“…In the light of the above situation, the type II heterojunction cannot explain hydrogen evolution or dye degradation by hydroxyl radicals as it is documented from scavenger experiments. By adopting the step S-scheme mechanism, [38][39][40][41][42][43][44][45][46][47][48][49] the positive holes in the VB of SnO 2 and electrons in the CB of BiVO 3 are sacriced. However, the positive holes in the VB of BiVO 3 with a potential of 3.1 eV easily oxidize water to produce hydroxyl radicals (OH-/OH.)…”

“…The construction of a step-scheme (S-scheme) heterojunction with superior redox ability is an efficient route to develop high-efficiency photocatalysts for various industrial and environmental applications. [38][39][40][41][42][43][44][45][46][47][48][49] Meng et al prepared TiO 2 /polydopamine nanocomposites with a considerably high efficiency in the reduction of CO 2 due to the effective charge carrier separation through the step S-scheme mechanism. 40 The photocatalytic removal of Hg 0 under visible light is reported by Xiao et al on the surface of the CeO 2 /BiOI S-scheme heterojunction who reported that the electron migration process through the step Sscheme mechanism enhances the reactivity in the removal process.…”