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 H2 production. In the present study, various ratios of 1T/2H‐MoSe2 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, MoSe2 is incorporated with CdZnS to form the heterostructures. Remarkably, the highest H2 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 H2 production performance is attributed to the increased absorption of visible light and the suppression of electron–hole recombination, thereby enhancing overall H2 production. The heterostructures exhibit unparalleled photocatalytic efficiency, owing to the fast electron mobility inherent in the 1T‐MoSe2, resulting in a substantial improvement in carrier separation. These findings highlight the significance of tuning the 1T/2H ratio of MoSe2 for augmenting photocatalytic H2 production, showing the potential of heterostructure engineering for catalytic applications. [ABSTRACT FROM AUTHOR]