MXene-based Nanomaterials for Highperformance Supercapacitor Applications

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Technological advances in recent decades have augmented the demand for durable and inexpensive energy storage devices with higher charge capacity. Owing to their unique charge storage and surface capability, a recent class of two-dimensional (2D) materials known as MXenes has been widely used in energy storage devices. MXenes are the layered transition metal carbides, nitrides, and/or carbonitrides produced via selective etching of interleaved "A" layers from parent MAX phases. Unlike other 2D materials, MXenes earned great attention because of their intrinsic surface functional groups, hydrophilicity, unique electrochemical nature, high conductivity, and superior charge storage capacity. Such features render MXenes as the ultimate material from the 2D family, thus inspiring researchers to delve further into experimental and theoretical realms. Numerous attempts have been made to elucidate synthesis strategies to produce MXene and its fundamental characteristics. The current chapter emphasizes the recent advancements in MXene-based electrochemical energy storage applications using supercapacitors which are recognized as a dominant source. The effect of MXene's morphology and electrode growth on the charge-storage mechanism has also been highlighted in subsequent sections. In addition, this chapter outlines the current state-of-the-art on the supercapacitors compromised of the MXenebased composites. A discussion of relevant challenges associated with such materials for energy storage applications is also presented, and future perspectives provide additional insight into their practical aspects.