近年来,能源危机和环境退化严重。取之不尽的太阳能可用于光催化制氢或CO2还原,以减少CO2排放。目前,开发高效光催化剂迫在眉睫。MXene作为新的二维(2D)层状材料,近年来已被用于各个领域。基于它的高导电性,可调带隙结构和相当大的比表面积,MXene有利于加速光催化中的分离和减少光电子-空穴对的结合。然而,由于强大的范德华力和氢键相互作用,层的重新堆叠严重阻碍了MXene材料作为光催化剂的发展。相比之下,由MXene纳米片和其他材料组成的基于MXene的异质结构不仅有效地抑制了层的重新堆叠,而且在光催化方面也表现出优越的协同效应。在这里,本文综述了基于MXene的异质结构作为光催化剂在能源和环境领域的最新进展。特别是,新的合成策略,形态学,结构,基于MXene的异质结构的机理在制氢中得到了强调,减少CO2,和污染物降解。此外,合成策略之间的结构-活性关系,组件,MXene基异质结构的形态和结构,并对其光催化性能进行了详细阐述。最后,本文对异质结构在光催化中的应用研究进行了总结和展望。
Energy crises and environmental degradation are serious in recent years. Inexhaustible solar energy can be used for photocatalytic hydrogen production or CO2 reduction to reduce CO2 emissions. At present, the development of efficient photocatalysts is imminent. MXene as new two-dimensional (2D) layered material, has been used in various fields in recent years. Based on its high conductivity, adjustable band gap structure and sizable specific surface area, the MXene is beneficial to hasten the separation and reduce the combination of photoelectron-hole pairs in photocatalysis. Nevertheless, the re-stacking of layers because of the strong van der Waals force and hydrogen bonding interactions seriously hinder the development of MXene material as photocatalysts. By contrast, the MXene-based heterostructures composed of MXene nanosheets and other materials not only effectively suppress the re-stacking of layers, but also show the superior synergistic effects in photocatalysis. Herein, the recent progress of the MXene-based heterostructures as photocatalysts in energy and environment fields is summarized in this review. Particularly, new synthetic strategies, morphologies, structures, and mechanisms of MXene-based heterostructures are highlighted in hydrogen production, CO2 reduction, and pollutant degradation. In addition, the structure-activity relationship between the synthesis strategy, components, morphology and structure of MXene-based heterostructures, and their photocatalytic properties are elaborated in detail. Finally, a summary and the perspectives on improving the application study of the heterostructures in photocatalysis are presented.