Synthesis of an ultrathin MnO2 nanosheet-coated Bi2WO6 nanosheet as a heterojunction photocatalyst with enhanced photocatalytic activity

Interfacial Bi–S bonds modulate band alignment for efficient solar water oxidation

“…According to previous reports, the band positions of CIS and BWO are presented in Fig. 3a, and the specific positions are shown in Table S1 † 18,19 . The heterojunctions formed by CIS and BWO comply with the type II or Z-scheme carrier transport pathway.…”

“…3a, and the specific positions are shown in Table S1. † 18,19 The heterojunctions formed by CIS and BWO comply with the type II or Z-scheme carrier transport pathway. To analyze the interfacial charge carrier transfer pathway of CIS/BWO and CIS-BWO photoanodes, in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS) was used.…”

“…13,14 The prerequisite for constructing Z-scheme heterojunctions is band structure matching, in which the conduction band (CB) of one semiconductor should be close to the valence band (VB) of the other semiconductor. [15][16][17] According to previous reports, the CB of BWO (+0.62 eV) is much lower than that of CIS (−0.58 eV), 18,19 but it is very close to the VB of CIS (+1.51 eV), suggesting that the photo-generated electrons are more likely transferred to the VB of CIS and recombine with photo-generated holes on the VB of CIS, which forms a Z-scheme carrier transfer pathway. However, the interfacial connection between CIS and BWO is generally poor, which prevents the transfer of charge flow.…”

A direct Z-scheme S-Co3O4/Bi2WO6 heterostructure for enhanced photoelectrocatalytic degradation of tetracycline under visible light

“…It is well known that the E fb of n-type semiconductors is 0.1 V higher than the CB, and the E fb of p-type semiconductors is lower than the VB by 0.1 V. 53 generation of many localized states above the VB edge, forming intermediate energy levels that could serve as separators for photogenerated carriers and reaction sites for reactants. 54 Therefore, it can be proved that the above band structure calculation is valid, and the band structure of S-Co 3 O 4 /Bi 2 WO 6 is shown in Fig. S7c (ESI †).…”

Construction of a Novel Visible-Light-Driven Z-Scheme NiAl-LDH Modified (BiO)2CO3 Heterostructure for Enhanced Photocatalytic Degradation Antibiotics Performance in Natural Water Bodies

“…Bi-based photocatalysts, including Bi 2 WO 6 , , Bi 2 MoO 6 , , BiOCl, BiOBr, BiOI, etc., − have been widely used as photocatalysts for their high photostability and low production cost. (BiO) 2 CO 3 , as a member of Bi-based semiconductors, have the typical Aurivillius structure, built by alternating layers of [Bi 2 O 2 ] 2+ and CO 3 2– .…”