Morphology- and size-dependent FAPbBr3/WO3 Z-scheme photocatalysts for the controllable photo-oxidation of benzyl alcohol

Photocatalytic benzyl alcohol (BA) oxidation to value-added chemicals by semiconductors has attracted massive attentions due to its industrial interest. In this work, Z-scheme heterojunction photocatalysts composed of FAPbBr 3 nanocrystals (NCs) and WO 3 with different morphologies are prepared. Benefiting from the strong redox potential and morphological engineering, the Z-scheme heterojunction photocatalyst exhibits an outstanding performance of BA oxidation to benzaldehyde (BD) with 99% selectively. Remarkably, after manipulating the size of FAPbBr 3 NCs to quantum dots (QDs), benzoic acid (BZ) as the main product (90% selectivity) of BA oxidation can be generated on the Z-scheme photocatalyst. As revealed by in-situ electronic paramagnetic resonance (EPR), a new radical will be generated over the FAPbBr 3 QDs/WO 3 which alters the product of benzyl alcohol oxidation form BD to BZ.