MXene‐induced construction of SnS2 nano‐arrays with sulfur vacancies for high‐efficiency photocatalytic CO2 reduction

Solar‐driven CO₂ reduction has gained significant attention as a sustainable approach for CO₂ utilization, enabling the selective production of fuels and chemicals. SnS₂, a non‐precious metal sulfide semiconductor, has great potential in photocatalytic CO₂ reduction due to its unique physicochemical properties. However, low electrical conductivity and susceptibility to aggregation of pure SnS₂ 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 SnS₂ through electrostatic interactions and in situ solvothermal heating. Interconnected SnS₂ nano‐array with abundant sulfur vacancies was successfully prepared on MXene surface (Vs‐SnS₂/MXene). This unique structure promotes the separation and migration of photogenerated charges and effectively inhibits electron‐hole recombination. Compared with pure SnS₂, the average lifetime of photogenerated charges in Vs‐SnS₂/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 SnS₂ (18.3 μmol⋅g⁻¹⋅h⁻¹), and showed excellent photocatalytic CO₂ reduction performance in gas‐solid‐phase reaction mode. In addition, Vs‐SnS₂/MXene also showed excellent stability. The results showcased the transformative potential of integration strategies for designing high‐performance photocatalytic systems.