Recent developments on MXene-based Zn-ion flexible supercapacitors

MXenes are a new class of two-dimensional layered structure materials that have caught attention of researchers recently. The unique feature of such a layered structure is that it can help in the easy access of electrolyte ions and offers more redox active sites, making MXenes a highly suitable electrode material for electrochemical energy storage applications, which are therefore extensively investigated in supercapacitor applications. However, for specific flexible applications, making a highly efficient flexible energy storage device with exceptional power, energy, and cycle life performance is crucial. To have high specific energy, Zn-ion-based flexible charge storage devices have been studied where MXene plays a significant role as an electrode material. However, making a flexible device with good mechanical stability along with reliable electrochemical performances is challenging. Therefore, MXene is preferred as an active material as individual, composite, and flexible film electrodes due to their high electrochemical accessibility and mechanical and electrochemical stability. Thus, this review discusses the recent developments of MXene-based Zn-ion FSC and highlights their potential for producing state-of-the-art technologies. It also discusses significant challenges and future perspectives of MXene to encourage further research and development in this area.