Photocatalytic conversion of CO₂ into a special chemical fuel with high yield and selectivity is still a major challenge. Herein, a 3D hierarchical NiAl-LDH/Ti₃C₂ MXene (LDH/TC) nanocomposite is constructed through in situ loading of Ti₃C₂ nanosheets on the NiAl-LDH scaffold during the hydrothermal process. The formation of a uniform and well-defined 2D/2D heterogeneous interface can be realized by optimizing the ratio of Ti₃C₂ and the precursors for NiAl-LDH. The 3D hierarchical scaffold with high specific surface area contributes to the favourable photon adsorption and utilization. The intimate contact between Ti₃C₂ and NiAl-LDH with numerous interfaces effectively promotes the separation of the photoinduced electron-hole pairs in NiAl-LDH. Together with the highly exposed oxidation–reduction active sites and the enhanced CO₂ capture and activation. The maximum photocatalytic CO production rate on NiAl-LDH/Ti₃C₂ reaches 11.82 μmol g⁻¹h⁻¹ with 92% selectivity and superior stability. This work provides an effective approach for the development of an ideal photocatalyst by collaborative utilization of materials with different dimensionalities.

将CO ₂光催化转化为具有高收率和选择性的特殊化学燃料仍然是主要挑战。在本文中，通过在水热过程中将Ti ₃ C ₂纳米片原位负载在NiAl-LDH支架上，构建了3D分层NiAl-LDH / Ti ₃ C ₂ MXene（LDH / TC）纳米复合材料。可以通过优化Ti ₃ C ₂和NiAl-LDH的前体的比例来实现均匀且定义明确的2D / 2D异质界面。具有高比表面积的3D分层支架有助于良好的光子吸附和利用。Ti ₃之间的紧密接触具有许多界面的C ₂和NiAl-LDH有效地促进了NiAl-LDH中光致电子-空穴对的分离。以及高度暴露的氧化还原活性位点以及增强的CO ₂捕获和活化。NiAl-LDH / Ti ₃ C ₂上的最大光催化CO生成速率达到11.82μmolg ^-1 h ^-1，具有92％的选择性和出色的稳定性。这项工作为通过协作利用不同尺寸的材料开发理想的光催化剂提供了有效的方法。