New progress on MXenes-based nanocomposite photocatalysts

Two-dimensional (2D) materials, especially transition metal carbides and/or nitrides (MXenes), have aroused extensive research interest in the field of photocatalysis. Specifically, the unique properties of high electrical conductivity, abundant surface functional groups, considerable specific surface area, and excellent photo-thermal effect allow MXenes to play versatile roles in photocatalysis. Herein, the latest and encouraging developments in MXenes-based composite materials for photocatalytic applications in recent two years are reviewed. We first briefly describe the roles of MXenes as a support and co-catalyst to promote the distribution of photocatalysts and facilitate the separation of the photogenerated charge carriers, respectively. Then, the design and fabrication of MXenes-based composite materials for various photocatalytic applications including H2 evolution, CO2 reduction, environmental remediation, and H2O2 generation are comprehensively illustrated. Finally, we point out the challenges and prospects for the future development of MXenes-based composite materials