Construction of hierarchical heterostructure is considered as a promising approach to promote photocatalytic CO₂ reduction, yet the report about CdS semiconductor for photocatalytic activity is still restricted caused by its rapid charge recombination. Herein, a novel carbon dots (CDs) modified CdS hollow sphere (CDs/CdS) has been successfully synthesized by multi-step including template-assembly, template-removal, and ultrasonic impregnation processes. This noble-metal-free heterostructure exhibits significantly improved solar-driven CO₂ reduction performance, and the optimal CDs/CdS presents CO yield rate of 16.09 μmol g^-1 h^-1, which is nearly 4 times higher than that of pristine CdS hollow sphere under the same condition. The excellent performance and stability of CDs/CdS are due to the formed hollow sphere and seamless contact, which can possess large inner space, intimate interfacial contact for charge transport and improve concentration of sacrificial agent. Meanwhile, CDs as cocatalyst can boost the charge separation and stabilize the electrons. This study can afford a feasible perspective to design and fabricate high-efficient catalyst for CO₂ photoreduction.

构建多级异质结构被认为是促进光催化CO ₂还原的一种有前途的方法，但由于其快速的电荷复合，关于光催化活性的CdS半导体的报道仍然受到限制。在此，一种新型碳点 (CDs) 修饰的 CdS 空心球 (CDs/CdS) 已通过模板组装、模板去除和超声浸渍等多步工艺成功合成。这种不含贵金属的异质结构显着提高了太阳能驱动的 CO ₂还原性能，最佳 CDs/CdS 的 CO 产率为 16.09 μmol g ^-1  h ^-1，在相同条件下比原始 CdS 空心球高近 4 倍。CDs/CdS优异的性能和稳定性归功于其形成的空心球体和无缝接触，具有较大的内部空间、用于电荷传输的紧密界面接触和提高牺牲剂的浓度。同时，CDs作为助催化剂可以促进电荷分离并稳定电子。_{该研究为设计和制造用于CO 2}光还原的高效催化剂提供了可行的视角。