Enhanced photocatalytic hydrogen evolution through MoS 2 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 2 quantum dots (MoS 2 QDs) as a cocatalyst into Cs 3 Bi 2 I 9 , resulting in a high enhancement in photocatalytic performance. Remarkably, the optimum MoS 2 QDs/Cs 3 Bi 2 I 9 composite achieves an impressive hydrogen evolution rate (6.09 mmol h -1 g -1 ) in an ethanol and HI/H 3 PO 2 mixed solution. This rate is 8.8 times higher than pristine Cs 3 Bi 2 I 9 (0.69 mmol h -1 g -1 ) and notably surpasses Pt/Cs 3 Bi 2 I 9 (2.47 mmol h -1 g -1 ). Moreover, the composite displays exceptional stability during an 18-hour reaction, showcasing its potential for sustainable photocatalytic hydrogen evolution.