Tailoring Phase Engineering of 1T/2H‐MoSe2/CdZnS Heterostructures for Improved Solar‐Driven H2 Production

Heterostructure engineering stands out as a potent strategy for advancing photocatalytic H 2 production. In the present study, various ratios of 1T/2H‐MoSe 2 are synthesized by modulating the quantity of the reducing agent. Notably, the sample characterized by the highest 1T phase content exhibits the lowest charge transfer resistance and superior absorption of visible light. Subsequently, MoSe 2 is incorporated with CdZnS to form the heterostructures. Remarkably, the highest H 2 production rate at 6.4 mmol g −1 h −1 of the sample, surpassing that of CdZnS by a factor of six, is demonstrated. The improved H 2 production performance is attributed to the increased absorption of visible light and the suppression of electron–hole recombination, thereby enhancing overall H 2 production. The heterostructures exhibit unparalleled photocatalytic efficiency, owing to the fast electron mobility inherent in the 1T‐MoSe 2 , resulting in a substantial improvement in carrier separation. These findings highlight the significance of tuning the 1T/2H ratio of MoSe 2 for augmenting photocatalytic H 2 production, showing the potential of heterostructure engineering for catalytic applications.