Ti3C2Tx MXene/graphene nanocomposites: Synthesis and application in electrochemical energy storage

Similar to graphene, two-dimensional (2D) transition metal carbides and nitrides (MXenes) have been demonstrated great potential in the electrochemical energy storage owing to their excellent hydrophilicity and conductivity, large specific capacitance and excellent electrochemical performance, etc. The combination of MXene and graphene can effectively prevent the restacking of graphene and MXene, which greatly improve the specific surface area and specific capacity of MXene and graphene. However, the large-scale production of MXene/graphene materials through low-cost and simple synthetic route is a big challenge. In this review, we firstly review recent synthesis methods of Ti3C2 MXene/graphene composites and the related mechanisms. Subsequently, the progress in the energy storage applications of the composites are summarized, including supercapacitors, lithium-ion batteries, lithium-sulfur batteries, etc. Finally, the current existing problem and prospects of the MXene/graphene composites are discussed, which will provide a reference for the design and preparation of high-performance MXene-based energy storage devices.