Black Phosphorus Quantum Dots Modified CdS Nanowires with Efficient Charge Separation for Enhanced Photocatalytic H2 Evolution

Graphical Photocatalysis : A 0D-1D BPQDs/CdS composite with high-quality interface was prepared by a facile electrostatic self-assembly approach. The optimized H 2 evolution rate of 3 wt % BPQDs/CdS can reach up to 9.9 mmol g −1 h −1 . The enhanced activity is attributed to the rapid transfer of photogenerated electrons from CdS to BPQDs, which is thoroughly demonstrated by time-resolved TAS spectra. Constructing a high-quality interface with strong coupling interaction is highly desirable in composite photocatalysts for the efficient interfacial charge transfer. Herein, we prepared black phosphorus quantum dots/CdS (BPQDs/CdS) binary composites with tight interfacial contact via a facile electrostatic self-assembly approach for efficient photocatalytic H 2 evolution. The optimized H 2 evolution rate of 3 wt % BPQDs/CdS can reach up to 9.9 mmol g −1 h −1 in lactic acid aqueous solution, 99 and 5.5 times greater than that of pristine BPQDs and CdS, respectively. Benefiting from the strong interface interaction between CdS and BPQDs in well-contacted BPQDs/CdS composites, efficient charge separation can be achieved, leading to enhanced photocatalytic H 2 evolution activity. Notably, the rapid transfer of photogenerated electrons from CdS to BPQDs was unambiguously confirmed by time-resolved transient absorption spectroscopy.