Interplay of Capacitive and Diffusion Contributions in Redox Active Complex Metal Oxide Rods Channelled into MXene for Improved Charge Transfer Dynamics

Abstract

A synergistic approach combining capacitive and redox-active materials is employed to develop supercapacitors that effectively overcome the gap between traditional supercapacitors and batteries in terms of their high-power delivery and increased energy storage capacity. Here we have reported MXene with manganese vanadium oxide (Mn 2 V 2 O 7 ) nanorods to eliminate the limitations such as restacking of MXenes, which poses a major problem in achieving high conductivity to be used in supercapacitor applications. Formation of pathways for ion migration in the Mn 2 V 2 O 7 /MXene composite, resulting in increased conductivity, enhanced ion transport capacity, and structural stability in aqueous electrolytes, gives high performance with a specific capacitance of 627 F g −1 at 1 A g −1 . The assembled device Mn 2 V 2 O 7 /MXene//AC gives a high potential window of 2 V with a high specific energy of 106 Wh kg −1 at a power density of 1000 W kg −1 . Moreover, complex impedance spectra are extracted using the distribution of relaxation time (DRT) analysis to get insights into electrochemical processes with enhanced resolution to understand the dynamics of the charge transfer kinetic processes.