The rational design of photocatalyst that can effectively reduce CO₂ under visible light (λ > 400 nm), and simultaneously precise control of the products syngas (CO/H₂) ratio is highly desirable for the Fischer-Tropsch reaction. In this work, we synthesized a series of CeO₂-decorated layered double hydroxides (LDHs, Ce-x) samples for photocatalytic CO₂ reduction. It was found that the selectivity and productivity of CO and H₂ from photoreduction of CO₂ in conjunction with Ru-complex as photosensitizer performed an obvious “volcano-like” trend, with the highest point at Ce-0.15 and the CO/H₂ ratio can be widely tunable from 1/7.7 to 1/1.3. Furthermore, compared with LDH, Ce-0.15 also drove photocatalytic CO₂ to syngas under 600 nm irradiation. It implied that an optimum amount of CeO₂ modifying LDH promoted the photoreduction of CO₂ to syngas. This report gives the way to fully utilize the rare earth elements and provides a promising route to enhance the photo-response ability and charge injection efficiency of LDH-based photocatalysts in the synthesis of syngas with a tunable ratio under visible light irradiation.

费-托反应非常需要合理设计的光催化剂，该光催化剂可以在可见光（λ> 400 nm）下有效还原CO ₂，同时精确控制产物合成气（CO / H ₂）的比率。在这项工作中，我们合成了一系列用CeO ₂装饰的层状双氢氧化物（LDHs，Ce-x）样品，用于光催化还原CO ₂。结果发现，光催化还原CO ₂和Ru配合物作为光敏剂对CO ₂和H ₂的选择性和生产率表现出明显的“火山状”趋势，最高点在Ce-0.15和CO / H _2上。比率可以从1 / 7.7调节到1 / 1.3。另外，与LDH相比，Ce-0.15在600nm照射下也将光催化CO _2驱动为合成气。这暗示了最适量的CeO ₂修饰LDH促进了CO ₂的光还原为合成气。该报告提供了充分利用稀土元素的方法，并提供了一个有前途的途径，以提高可见光照射下合成比例可调的合成气中LDH基光催化剂的光响应能力和电荷注入效率。