MXene‐Induced Construction of SnS 2 Nano‐Arrays with Sulfur Vacancies for High‐Efficiency Photocatalytic CO 2 Reduction

Abstract Solar‐driven CO 2 reduction has gained significant attention as a sustainable approach for CO 2 utilization, enabling the selective production of fuels and chemicals. SnS 2 , a non‐precious metal sulfide semiconductor, has great potential in photocatalytic CO 2 reduction due to its unique physicochemical properties. However, low electrical conductivity and susceptibility to aggregation of pure SnS 2 lead to a high charge recombination rate and hinder the photocatalytic efficiency. In this study, we report that single/few‐layered MXene induces ordered growth of SnS 2 through electrostatic interactions and in situ solvothermal heating. Interconnected SnS 2 nano‐array with abundant sulfur vacancies was successfully prepared on MXene surface (Vs‐SnS 2 /MXene). This unique structure promotes the separation and migration of photogenerated charges and effectively inhibits electron‐hole recombination. Compared with pure SnS 2 , the average lifetime of photogenerated charges in Vs‐SnS 2 /MXene increased by 45.6 %. Meanwhile, its CO production rate reached 47.6 μmol⋅g −1 ⋅h −1 , which was 2.6‐fold higher than that of pure SnS 2 (18.3 μmol⋅g −1 ⋅h −1 ), and showed excellent photocatalytic CO 2 reduction performance in gas‐solid‐phase reaction mode. In addition, Vs‐SnS 2 /MXene also showed excellent stability. The results showcased the transformative potential of integration strategies for designing high‐performance photocatalytic systems.