Tin oxide/MXene nanocomposite for energy storage devices

Supercapacitors are gaining attention due to their fast charge-discharge rates, long cycle life, and high-power density. MXenes, especially Ti₃C₂T_x, are promising electrode materials due to their excellent energy storage properties; however, their practical use is limited by stacking of nanosheets and low specific capacity. In this study, we developed a simple one-step hydrothermal method for in situ growth of SnO (tin oxide) on Ti₃C₂T_x (MXene). The SnO/Ti₃C₂T_x composite prevents MXene aggregation and achieves a specific capacity of 29.3 mAh g^-1 at 5 mV s^-1 in 1 M KOH electrolyte, showing enhanced electrochemical performance. An asymmetric supercapacitor (ASC) using SnO/Ti₃C₂T_x//AC delivered an energy density of 26.7 Wh kg^-1 at a power density of 1128 W kg^-1. This study highlights the synthesis and electrochemical performance of SnO/Ti₃C₂T_x composites. The proposed synthesis strategy is capable of preparing various transition metal oxides and conducting polymer-based composites for energy storage applications.