Research Progress of Two-Dimensional MXene-Based Composite Photocatalysts

MXene as a novel two-dimensional transition metal carbides, nitrides or carbonitrides has the excellent metal conductivity, high carrier mobility, and surface-terminated groups regulated band structure. It can be thus used as a cocatalyst in photocatalytic material systems to improve the photocatalytic properties. This review represented recent research progress on the controllable construction of MXene-based composites with zero-dimensional, one-dimensional, two-dimensional, and three-dimensional semiconductor photocatalytic materials and its applications in the photocatalytic fields (i.e., pollutant removal, hydrogen production, CO₂ reduction, and nitrogen fixation). Also, the construction methods and photocatalytic enhancement mechanisms of two-dimensional MXene-based composite photocatalysts were given. In addition, the future research directions of MXene-based composite photocatalysts were also prospected.