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 Ti3C2Tx, 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 Ti3C2Tx (MXene). The SnO/Ti3C2Tx 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/Ti3C2Tx//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/Ti3C2Tx composites. The proposed synthesis strategy is capable of preparing various transition metal oxides and conducting polymer-based composites for energy storage applications.