Enhancing Capacitance Performance of Ti₃C₂T_x MXene as Electrode Materials of Supercapacitor: From Controlled Preparation to Composite Structure Construction

Ti₃C₂T _x, a novel two-dimensional layer material, is widely used as electrode materials of supercapacitor due to its good metal conductivity, redox reaction active surface, and so on. However, there are many challenges to be addressed which impede Ti₃C₂T _x obtaining the ideal specific capacitance, such as restacking, re-crushing, and oxidation of titanium. Recently, many advances have been proposed to enhance capacitance performance of Ti₃C₂T _x. In this review, recent strategies for improving specific capacitance are summarized and compared, for example, film formation, surface modification, and composite method. Furthermore, in order to comprehend the mechanism of those efforts, this review analyzes the energy storage performance in different electrolytes and influencing factors. This review is expected to predict redouble research direction of Ti₃C₂T _x materials in supercapacitors.[Figure not available: see fulltext.]