Exploring effective photocatalyst to promote the conversion of CO₂ into valuable chemical fuels remains a great challenge. Herein, a novel heterostructure, namely Ti₃C₂ quantum dots (QDs) decorated NH₂-MIL-101(Fe), was designed and fabricated via an electrostatic adsorption method. The resultant heterostructure exhibited remarkably improved activity for CO₂ photoreduction under visible-light illumination. The optimal NH₂-MIL-101(Fe)@Ti₃C₂ QDs catalyst with 0.75 wt% Ti₃C₂ QDs achieved a CO-evolution rate of 55.7 μmol h⁻¹ g⁻¹, which was 2.6 times greater than that of pristine NH₂-MIL-101(Fe). The enhanced activity of NH₂-MIL-101(Fe)@Ti₃C₂ QDs was mainly due to the extended visible-light response and the effective charge separation and transfer benefiting from the formation of a Schottky junction at the interface. Isotope-labeling experiment indicated that CO was produced from CO₂. Finally, the reaction intermediates and mechanism of photocatalytic CO₂ reduction were investigated by in-situ FT-IR.

_{探索有效的光催化剂以促进CO 2}转化为有价值的化学燃料仍然是一个巨大的挑战。在此，一种新型异质结构，即Ti ₃ C ₂量子点(QDs) 修饰NH ₂ -MIL-101(Fe)，是通过静电吸附法设计和制造的。所得异质结构在可见光照射下显示出显着改善的 CO _{2光还原活性。}具有 0.75 wt% Ti ₃ C ₂ QD的最佳 NH ₂ -MIL-101(Fe)@Ti ₃ C _{2 QDs 催化剂实现了 55.7 μmol h} ⁻¹ g ⁻¹的 CO 释放速率，这是原始 NH ₂ -MIL-101(Fe) 的 2.6 倍。_{NH 2} -MIL-101(Fe)@Ti ₃ C ₂ QDs活性的增强主要是由于扩展的可见光响应和有效的电荷分离和转移得益于界面处肖特基结的形成。同位素标记实验表明CO是由CO ₂产生的。最后，通过原位傅立叶变换红外光谱研究了光催化CO ₂还原的反应中间体和机理。