Publication date: 15th May 2025
Hydrogen fuel from solar water reduction is one of the most suitable solutions to the global energy shortage. Due to the excellent light harvesting properties of semiconductor nanocrystals (NCs), multi- exciton production, photostability, and remarkable photochemical properties, these materials have significant potential to serve as efficacious photocatalysts for various redox reactions. The synthesis of metal-semiconductor hybrid NCs signifies one of the most effective strategies to fully leverage the light absorption properties of semiconductors and the inherent catalytic properties of metals. These heterostructures offer synergistic effects that can improve light absorption and light-induced charge separation effects at the metal-semiconductor nano junction and, hence, efficient photocatalytic performance. In this work, we have explored the growth of different metals on type-I CdS/ZnS core/shell NCs for their photocatalytic performance for hydrogen evolution reaction (HER). With the growth of Au domains on the CdS/ZnS core/shell structures, over 400-fold increment of photocatalytic H 2 evolution rate was achieved in comparison to bare CdS/ZnS core/shell NCs. We aim to not only provide insightful understanding of charge carrier dynamics in metal-semiconductor heterostructures but also lay the foundation for the future design of the quantum dot-based hybrid photocatalytic systems.
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