In situ fabrication of a 2D/2D WO3/Bi5O7I S-scheme heterojunction with enhanced spatial charge separation and tetracycline degradation

Schematic illustration of the formation of energy band bending and interface electric field (IEF) from Bi 5 O 7 I (+) to WO 3 (−) before and after the contact of WO 3 and Bi 5 O 7 I, and the possible S-scheme carrier transfer mechanism.