MXene/Bi ₂ O ₃ Nanocomposites as Supercapacitors for Portable Electronic Devices

2D MXene nanosheets often encounter challenges such as aggregation and restacking, which can significantly decrease their performance in supercapacitor applications. Herein, we prepared the Bi₂O₃ nanoflowers decorated MXene electrode via the coprecipitation method. The insertion of Bi₂O₃ nanoflowers over the MXene nanosheet not only effectively resolves the restacking challenge of the MXene nanosheet but also improves the overall electrochemical performance of the MXene/Bi₂O₃ nanocomposite. The fabrication of an MXene/Bi₂O₃//MnCo₂O₄ supercapacitor device used for powering portable electronic devices confirmed that the lab-scale innovation could be turned into practical energy technologies. This work highlights a room-temperature synthesis strategy for the MXene-based nanocomposite, leading to high-performance, laboratory-scale prototype energy storage devices. Furthermore, this self-assembly process of MXene-metal oxide nanocomposites at room temperature opens new avenues for energy storage applications.