fig9

From: Interfacial engineering of Bi-based heterojunction for boosting photocatalytic nitrogen fixation: a perspective review

Figure 9. Front-view of the charge difference distribution of physically mixed (A) V_O-BOB:BSB and (B) V_O-BOB/BSB heterojunction. (C) Energy band diagrams before and after V_O-BOB and BSB come into contact, proposed mechanisms for photocatalytic overall N₂ fixation. (A-C) Reproduced with permission from^[61]. Copyright 2026, Elsevie; (D) A schematic illustration of band structures for CN, STO, and BOC; (E) Surface potential difference of the BOC/CN/STO under irradiation; Planar-averaged electron density difference Δρ(z) of (F) BOC/CN and (G) CN/STO. Copyright 2026, (D-G) Reproduced with permission from^[138]. Wiley-VCH GmbH. BOB: BiOBr; BSB: BiSBr; BOC: Bi₂O₂CO₃; CN: g-C₃N₄; STO: SrTiO₃; CB: conduction band; VB: valence band; BSB: BiSBr.