Recent advances in two-dimensional MXenes: New horizons for flexible battery and supercapacitor technologies

MXenes(two-dimensional (2D) Transition Metal (TM) carbides (TMCs), TM nitride (TMNs) and TM Carbon nitride (TMCNs) are the largest family of two-dimensional materials (2DMs) in the future, with novel applications in different nanotechnology research at the academic and industrial levels. MXenes nanomaterials have the potential to be classified as "wonder materials" for two-dimensional nanomaterials (NMs). Since its first discovery in 2011, MXenes have been studied and synthesized for more than a decade, with more than 50 members conducting experimental studies and more than 100 members conducting theoretical studies to date. The synthesis technology is not limited to the top-down HF-based etching method introduced for the first time, but new innovative synthesis methods such as anhydrous etching, molten salt etching and bottom-up chemical vapor deposition (CVD) method are also investigated, providing a multifunctional surface chemistry MXenes NMs with novel structure and desirable properties. Because of its unique layered structure, excellent electrochemical performance and excellent functional performance, MXenes is widely used in flexible energy storage devices such as secondary batteries, supercapacitors, microbatteries and microbatteries. In this review, we will first discuss in detail the synthetic methods of MXenes NMs, and secondly the properties of the selections, as well as their application in various fesd. After that, we will summarize and discuss current issues related to the synthesis of MXenes NMs and its application in fesd, as well as possible solutions. Finally, we will discuss the future progress of Mxenes-based NMSS in wearables and fesd, their limitations and recommendations.