Efficient Charge Carrier Transfer Route Induced by an S-Scheme α-Fe 2 O 3 /RP Heterojunction with Enhanced Photocatalytic Activity of Overall Water Splitting.

Photocatalytic overall water splitting simultaneously generates O 2 and H 2 ; this is a potential strategy to solve the energy shortage problem. Elemental phosphorus (RP) displays ultralow visible light performance for O 2 and H 2 generation; thus, a novel α-Fe 2 O 3 /RP composite is designed and prepared by a low-temperature hydrothermal method via loading a trace amount of α-Fe 2 O 3 . In the experiment, the 1.5% α-Fe 2 O 3 /RP composite showed the best overall water splitting performance, which is 6.9 times that of bare RP. Through various characterization studies, the recombination rate of charges is significantly reduced. It is largely ascribed to the matched energy band structure of the two photocatalysts and the interface contact between α-Fe 2 O 3 and RP, which efficiently separates the photocarriers through an S-scheme mode and realizes the obvious enhancement of overall water splitting performance. Moreover, α-Fe 2 O 3 /RP maintains high activity when it is persistently irradiated for 15 cycles. The research provides insight into the exploitation of low-cost, high-activity, and stable RP-based photocatalysts to achieve visible light induced overall water splitting activity to generate O 2 and H 2 .