Abstract
The photocatalytic hydrogen evolution (PHE) activity of CdS photocatalysts is restricted by their inherent defects such as photocorrosion and rapid recombination of charge carriers. In this study, a hydrothermal approach was developed for the synthesis of one-dimensional (1D) CdS nanorods (CSNRs) coated with zero-dimensional (0D) CdS quantum dots (CSQDs) with the objective of enhancing photogenerated charge separation and transfer, and ultimately improve PHE. HRTEM images confirmed that CSQDs had intimate contact with CSNRs and were well distributed on the surface of CSNRs. A surface and porosity analysis showed that optimal CSQDs/CSNRs exhibited an augmented specific surface area compared to unmodified CSNRs, which facilitates charge transport and surface reactions. PHE experiments carried out under visible light demonstrated that CSQDs loaded on the surface of CSNRs enhanced PHE 1.51 times. Transient photocurrent, electrochemical impedance spectroscopy, and photoluminescence analyses indicated that the improved PHE was mainly due to more effective electron-hole separation due to charge transfer between CSQDs and CSNRs.
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