Rapid dissociation of high concentration excitons between [Bi2O2]2+ slabs with multifunctional N-Bi-O sites for selective photoconversion into CO

Locally Asymmetric BiOBr for Efficient Exciton Dissociation and Selective O2 Activation toward Oxidative Coupling of Amines

“…Meanwhile, the [Br] − slabs with highly localized valence electrons display reduced electronic screening that further makes e – –h + pairs strongly tangled in energy, eventually evolving into excitons (Scheme b). To this end, strong excitonic effects in layered BiOBr with highly ordered out-of-plane symmetry constitute shackles for charge carrier-driven photocatalysis, including O 2 activation ,− and CO 2 reduction . The introduction of defects, , dopants, ,, and disordered domains into exciton-based 2D layered photocatalysts has been previously demonstrated to enable destabilization of bound excitons via establishing discontinuously distributed energy landscapes, thus promoting exciton dissociation.…”

“…To this end, strong excitonic effects in layered BiOBr with highly ordered out-of-plane symmetry constitute shackles for charge carrier-driven photocatalysis, including O 2 activation ,− and CO 2 reduction . The introduction of defects, , dopants, ,, and disordered domains into exciton-based 2D layered photocatalysts has been previously demonstrated to enable destabilization of bound excitons via establishing discontinuously distributed energy landscapes, thus promoting exciton dissociation. Beyond that, other potential strategies toward boosted exciton dissociation in 2D layered photocatalysts are urgently sought.…”

Simultaneous Morphology and Band Structure Manipulation of BiOBr by Te Doping for Enhanced Photocatalytic Oxygen Evolution

“…Therefore, to boost the photoreactivity of BiOBr, a variety of photocatalyst modification approaches have been proposed, such as metal or nonmetal doping, − cocatalyst loading, , and heterostructure building. − Nonmetal doping is a well-developed strategy to tune the electronic structure of the semiconductor, whereby a new energy level is formed above the valence band (VB) through orbital hybridization to effectively reduce the band gap, leading to increased visible light absorption . Particularly, nonmetal dopants such as C, N, and S have been widely reported to improve the photocatalytic activity of BiOBr. , For instance, Zhou et al reported multifunctional N–Bi–O site-modified BiOBr nanosheets, which could strengthen the interaction between [Bi 2 O 2 ] 2+ slabs to enrich the exciton concentration and rapid exciton dissociation, as well as enable the formation of low-oxidation-state active centers for a high yield of tetracycline (TC) into CO . Recently, Zhang et al demonstrated the capability of N-doped BiOBr atomic layers for directly splitting carbon-sequestrated natural seawater to CO and HClO under visible light irradiation.…”

Highly Enhanced Photocatalytic Properties of Tin Selenide Nanopowders by Microstructure Modulation

“…5 Photogenerated electrons migrate to the surface of the semiconductor and react with dissolved oxygen on the surface to generate superoxide radicals ( • O 2 − ), while holes have a strong redox ability to directly oxidize pollutants, and they can react with water molecules and hydroxide ions on the surface of the semiconductor to generate hydroxyl radicals ( • OH). 6 Through these active groups adsorbed on the surface of the catalyst, pollutants undergo redox reactions, to achieve the effect of photodegradation. 7−10 After many years of exploration, many system materials such as TiO 2 , SnO 2 , ZnO, and WO 3 have gained popularity among researchers in the field of photocatalysis.…”