Enhanced photocatalytic hydrogen evolution through MoS quantum dots modification of bismuth-based perovskites.

Efficient and cost-effective photocatalysts are pivotal for advancing large-scale solar hydrogen generation. Herein, we report a composite photocatalyst by incorporating MoS quantum dots (MoS QDs) as a cocatalyst into CsBiI, resulting in a high enhancement in photocatalytic performance. Remarkably, the optimum MoS QDs/CsBiI composite achieves an impressive hydrogen evolution rate (6.09 mmol h g) in an ethanol and HI/HPO mixed solution. This rate is 8.8 times higher than pristine CsBiI (0.69 mmol h g) and notably surpasses Pt/CsBiI (2.47 mmol h g). Moreover, the composite displays exceptional stability during an 18-hour reaction, showcasing its potential for sustainable photocatalytic hydrogen evolution.