Recent advances in MXene materials for zinc-ion hybrid capacitors

Zinc-ion hybrid capacitors (ZHCs) combine the merits of zinc ion batteries and supercapacitors, have attracted increasing attention due to cost-effectiveness, improved safety, high energy/power densities, long-term electrochemical stability, and ease of assembling. As one type of promising electrode material for ZHCs, MXene-based materials have drawn wide research because of their adjustable layer spacing, excellent physical and chemical properties, high conductivity and good electrochemical stability. In recent years, massive research on improving the energy density and cycle stability of ZHCs, and the modification and optimization of MXene have provided a new way to enhance the performance of ZHCs. In this paper, we briefly introduce the basic information about MXene, review several preparation methods of MXene, and emphasis on the modification and utilization of MXene in the cathodes, anodes and electrolyte of ZHCs. In addition, the utilization of MXene in ZHCs separators is also displayed. Eventually, the promising future and challenges of MXene-based materials for ZHCs applications are outlined.