Herein, we report the facile synthesis of uniform perovskite hydroxide CoSn(OH)₆ nanocubes and their first use as noble-metal-free, highly efficient and stable catalysts for the deoxygenative reduction of CO₂ to CO with visible light. The CoSn(OH)₆ sample is synthesized through a one-pot co-precipitation method and fully characterized by various techniques including XRD, FTIR, FESEM, TEM, EDX, EDX-mappings, XPS, DRS, and N₂ sorption measurements. The CoSn(OH)₆ solid is found by theoretical calculations to be capable of absorbing and activating CO₂ molecules on the (100) surface. Under the optimal reaction conditions, the CoSn(OH)₆ catalyst exhibits a high CO₂ reduction activity with visible light irradiation, affording a CO generation rate of 18.7 μmol h⁻¹. The stability and reusability of the CoSn(OH)₆ catalyst for phorocatalytic CO₂ reduction are solidly confirmed. Results of in situ photoluminescence spectroscopy and photocurrent response characterizations indicate that the CoSn(OH)₆ catalyst can efficiently promote the separation and transfers of photoexcited charge carriers during photocatalysis, and eventually leading to obviously enhanced CO₂ photoreduction performance. Moreover, a possible mechanism for the photocatalytic CO₂ reduction reaction is also proposed based on the results of activity evaluation and photo-/electro-chemical measurements.

在这里，我们报告了均匀钙钛矿氢氧化物CoSn（OH）₆纳米立方的简便合成方法，并将其首次用作无贵金属，高效且稳定的催化剂，用于在可见光下将CO ₂脱氧还原为CO 。CoSn（OH）₆样品通过一锅共沉淀法合成，并通过多种技术进行了全面表征，包括XRD，FTIR，FESEM，TEM，EDX，EDX映射，XPS，DRS和N ₂吸附测量。通过理论计算发现，CoSn（OH）₆固体能够吸收和活化（100）表面上的CO ₂分子。在最佳反应条件下，CoSn（OH）₆该催化剂在可见光照射下表现出高的CO ₂还原活性，CO产生速率为18.7μmolh ^-1。可靠地证实了用于荧光催化还原CO ₂的CoSn（OH）₆催化剂的稳定性和可重复使用性。的结果在原位光致发光光谱和光电流响应表征表明的CoSn（OH）₆的催化剂能有效地促进光催化过程中的分离和光激发电荷载体的传输，和最终导致明显增强CO ₂光还原的性能。此外，光催化CO ₂的可能机理 还基于活性评估和光/电化学测量的结果提出了还原反应。