Visible light-driven photoreduction of CO₂ and H₂O to tunable syngas is an appealing strategy for both artificial carbon neutral and Fischer–Tropsch processes. However, the development of photocatalysts with high activity and selectivity remains challenging. For this case, we here design a hybrid catalyst, synthesized by in situ deposition of Ag crystals on GaN nanobelts, that delivers a tunable H₂/CO ratio between 0.5 and 3 under visible light irradiation (λ>400 nm). The obtained photocatalyst delivers a maximal turnover frequency value of 3.85 h^–1 and a corresponding yield rate of 2.12 mmol h^–1 g^–1 for CO production, while the photocatalytic activity keeps stable during five cycling tests. Additionally, syngas can be detected even at λ>600 nm. Experiments and mechanistic studies reveal that the existence of Ag crystals not only extends the light absorption region but also promotes the charge transfer efficiency, and thereby leading to a photocatalytic improvement. Accordingly, the present work affords an opportunity for developing an efficient photo-driven system by using solar energy to alleviate CO₂ emissions.

可见光驱动的 CO ₂和 H ₂ O光还原为可调合成气对于人工碳中和过程和费托过程都是一种有吸引力的策略。然而，开发具有高活性和选择性的光催化剂仍然具有挑战性。对于这种情况，我们在这里设计了一种混合催化剂，通过在GaN 纳米带上原位沉积 Ag 晶体合成，在可见光照射下（λ > 400 nm）提供介于 0.5 和 3 之间的可调 H ₂ /CO 比。所得光催化剂的最大转化频率值为 3.85 h ^–1，相应的产率为 2.12 mmol h ^–1 g ^–1用于 CO 生产，而光催化活性在五次循环测试中保持稳定。此外，即使在λ > 600 nm 处也可以检测到合成气。实验和机理研究表明，Ag 晶体的存在不仅扩大了光吸收区域，而且提高了电荷转移效率，从而提高了光催化性能。因此，目前的工作为通过使用太阳能来减少 CO ₂排放来开发高效的光驱动系统提供了机会。