Solar-driven photocatalytic CO₂ reduction to produce valuable chemicals and fuels offers an attractive strategy in alleviating the energy crisis. Pt quantum dots (PtQDs) with TiO₂ nanowire (TiO₂NW)/Ti₃C₂ MXene heterostructures (Pt-TiO₂NW/Ti₃C₂) with tight interfacial contacts between the various components were prepared at room temperature via oxidation reactions. The incorporated PtQDs played crucial roles as electron conduction bridges supported by the cocatalyst effect, effectively enhancing the separation efficiencies of photoinduced electron/hole pairs and improving CO₂ reduction under simulated solar light irradiation. The Pt-TiO₂NW/Ti₃C₂ heterostructures exhibited remarkable carbon monoxide (CO) and methane (CH₄) production at respective rates of 38.14 and 36.15 μmol g⁻¹ after 10 h of simulated solar light irradiation, an apparent quantum yield of 1.68%, and 79.2% selectivity for CH₄. The photocatalytic activities of the Pt-TiO₂NW/Ti₃C₂ heterostructures for CO₂ reduction were significantly enhanced compared to those of TiO₂NW/Ti₃C₂ and the single-component photocatalysts, and they exhibited remarkable stabilities even after five cycles. In addition, the densities of states and electronic characteristics of Ti₃C₂ MXene and Pt-TiO₂NW/Ti₃C₂ were studied using density functional theory, and a synergistic mechanism of the improvement in CO₂ photoreduction is proposed.

太阳能驱动的光催化 CO ₂还原生产有价值的化学品和燃料为缓解能源危机提供了一个有吸引力的策略。在室温下通过氧化反应制备具有 TiO ₂纳米线 (TiO ₂ NW)/Ti ₃ C ₂ MXene 异质结构 (Pt-TiO ₂ NW/Ti ₃ C ₂ )的 Pt 量子点 (PtQD )，各组分之间具有紧密的界面接触. 掺入的 PtQD 作为助催化剂效应支持的电子传导桥发挥了至关重要的作用，有效地提高了光生电子/空穴对的分离效率并改善了 CO ₂在模拟太阳光照射下减少。Pt-TiO ₂ NW/Ti ₃ C ₂异质结构在模拟太阳光照射 10 小时后表现出显着的一氧化碳 (CO) 和甲烷 (CH ₄ ) 产量，分别为 38.14 和 36.15 μmol g ^-1 ，表观量子产率为 1.68%，对 CH ₄的选择性为 79.2% 。_{与TiO 2} NW/Ti ₃ C ₂相比，Pt-TiO ₂ NW/Ti ₃ C ₂异质结构对CO ₂还原的光催化活性显着增强和单组分光催化剂，即使经过五个循环，它们也表现出显着的稳定性。此外，利用密度泛函理论研究了Ti ₃ C ₂ MXene和Pt-TiO ₂ NW/Ti ₃ C ₂的态密度和电子特性，并提出了提高CO _{2光还原的协同机制。}