Design principle of S-scheme heterojunction photocatalyst

Cooperative Coupling of H2O2 Production and Organic Synthesis over a Floatable Polystyrene‐Sphere‐Supported TiO2/Bi2O3 S‐Scheme Photocatalyst

“…Subsequently, the Fermi levels bend gradually in the interface region and only equalize at the exact contacting point without changing the Fermi levels of TO or BO. [43,44] Thus, the charge redistribution leads to the band bending and the formation of an internal electric field at the interface of the heterojunction. Afterward, under solar illumination, electrons in TiO 2 and Bi 2 O 3 are individually excited from VB to CB.…”

H2-production and electron-transfer mechanism of a noble-metal-free WO3@ZnIn2S4 S-scheme heterojunction photocatalyst

“…Recently, an emerging S-scheme heterojunction has been proposed, which usually consists of both oxidation and reduction photocatalysts. [26][27][28][29][30][31][32][33] The useless photogenerated electrons and holes in the S-scheme heterojunction recombine, while the useful electrons in the reduction photocatalyst CB and holes in the oxidation photocatalyst valence band (VB) are preserved to participate in photocatalytic reactions. Such a transfer pathway of charge carriers facilitates efficient electron/hole separation and also enables stronger redox capability of the surviving photocarriers.…”

Enhanced Selective Photooxidation of Toluene to Benzaldehyde over Co3O4‐Modified BiOBr/AgBr S‐Scheme Heterojunction

“…When Co 3 O 4 -modified BiOBr/AgBr heterojunction is exposed to the visible light, the photogenerated electrons in the CB of BiOBr can recombine with the photogenerated holes of AgBr, while the powerful electrons and holes are respectively remained in AgBr and BiOBr surface for participating in different reactions, which is a typical S-scheme charge-transfer pathway. [60][61][62] The photogenerated electrons in the CB of AgBr can react with O 2 to form •O 2 À radical, while the photogenerated holes in the VB of BiOBr will diffuse to Co 3 O 4 involving the toluene deprotonation process to produce benzyl radical (PhCH 2 •). Then, the benzyl radicals can react with •O 2 À radical to produce the peroxyl products, which can be easily decompose to benzaldehyde through a dehydration process.…”