Solar-driven semiconductor-catalyzed photocatalytic water splitting is an important and eco-friendly chemical technique for the production of clean hydrogen fuel. However, a cost-effective, efficient photocatalyst with perfect photon-to-hydrogen molecule conversion remains elusive. Novel, noble-metal-free hybrid nanostructures comprising perovskite (Ba5Nb4O15)-MoS2 ultrathin nanosheets on CdS nanorods, with efficient photo-charge separation and migration capability for efficient solar-driven hydrogen production are designed. The nano-hybrid structures display a high hydrogen production rate of 147 mmol·g–1·h–1 in the presence of lactic acid as a sacrificial electron donor under simulated solar irradiation; this value is much higher than those of the CdS/MoS2 (124 mmol·g–1·h–1) and CdS/Ba5Nb4O15 (18 mmol·g–1·h–1) nanostructures and that of the expensive CdS/Pt benchmark catalyst (34.98 mmol·g–1·h–1). The apparent quantum yield at 425 nm reaches to 28.2% in 5 h. Furthermore, the rate of solar-driven hydrogen evolution in the presence of the ultrathin perovskite Ba5Nb4O15/MoS2 nanohybrid on the CdS nanorods is much faster than that of several noble-metal-free co-catalyst-modified CdS nanostructures reported earlier. UV–Vis absorption, photoluminescence, photocurrent, and impedance analyses of CdS@Ba5Nb4O15/MoS2 reveal that the high photocatalytic hydrogen evolution rate may due to the comparatively higher solar light-harvesting capacity and efficient charge separation and migration, which reduces the recombination rate. We anticipate that the presented design strategy for the development of noble metal-free catalysts combining perovskite and semiconductor nanostructures stimulate the development of diverse non-precious robust solar light-harvesting noble-metal-free materials for water splitting to satisfy the growing global energy demand.
Bibliographical noteFunding Information:
This work was financially supported by the National Research Foundation of Korea (NRF) grants funded by the Korean government (MSIP) (2014R1A4A1001690 and 2016R1E1A1A01941978). This research was also supported in part by the Max Planck POSTECH/KOREA Research Initiative Program [Grant No. 2016 K1A4A4A01922028] through the MEST's NRF funding.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry