摘要
The rational design of photocatalyst that can effectively reduce CO under visible light ( >400 nm), and simultaneously precise control of the products syngas (CO/H ) ratio is highly desirable for the Fischer-Tropsch reaction. In this work, we synthesized a series of CeO -decorated layered double hydroxides (LDHs, Ce- ) samples for photocatalytic CO reduction. It was found that the selectivity and productivity of CO and H from photoreduction of CO in conjunction with Ru-complex as photosensitizer performed an obvious “volcano-like” trend, with the highest point at Ce-0.15 and the CO/H ratio can be widely tunable from 1/7.7 to 1/1.3. Furthermore, compared with LDH, Ce-0.15 also drove photocatalytic CO to syngas under 600 nm irradiation. It implied that an optimum amount of CeO modifying LDH promoted the photoreduction of CO 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.
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