Review of Design Routines of MXene Materials for Magnesium‐Ion Energy Storage Device

Renewable energy storage using electrochemical storage devices is extensively used in various field applications. High‐power density supercapacitors and high‐energy density rechargeable batteries are some of the most effective devices, while lithium‐ion batteries (LIBs) are the most common. Due to the scarcity of Li resources and serious safety concerns during the construction of LIBs, development of safer and cheaper technologies with high performance is warranted. Magnesium is one of the most abundant and replaceable elements on earth, and it is safe as it does not generate dendrite following cycling. However, the lack of suitable electrode materials remains a critical issue in developing electrochemical energy storage devices. 2D MXenes can be used to construct composites with different dimensions, owing to their suitable physicochemical properties and unique magnesium‐ion adsorption structure. In this study, the construction strategies of MXene in different dimensions, including its physicochemical properties as an electrode material in magnesium ion energy storage devices are reviewed. Research advancements of MXene and MXene‐based composites in various kinds of magnesium‐ion storage devices are also analyzed to understand its energy storage mechanisms. Finally, current opportunities, challenges, and future prospects are also briefly discussed to provide crucial information for future research. MXene‐based magnesium‐ion energy storage device aims to discuss the preparation strategies of MXene with different dimensions and structural properties. Recent advancements of MXene‐based complexes, including their energy storage mechanisms in electrochemical magnesium‐ion storage applications, focus on a systematic discussion and analysis of supercapacitors, magnesium‐ion batteries, magnesium–lithium hybrid ion batteries, and magnesium–sulfur batteries.