Development of high-performance asymmetric supercapacitors based on MXene and Mn-doped Zn ferrite composites for energy storage applications

In this work, Mn_xZn_1-xFe₂O₄ (MZF) ferrite and MXene (Ti₃C₂T_x) composites were addressed to enhance the electrochemical performance. MXene is a relatively new material belonging to the 2D layered family and is mainly used to enhance the electrochemical features of electrode materials. The incorporation of MZF material acts as a conductive bridge, affecting the structural stability and electrochemical features of Ti₃C₂T_x MXene. MZF nanoparticles were embedded with Ti₃C₂T_x MXene to develop a hybrid MXene@MZF₁ electrode composite. The structural formation of composites was investigated using Raman spectroscopy, XRD, SEM, EDX, TEM, and XPS. The electrochemical examination of the prepared composite revealed a significant increase in specific capacitance. The (MXene)₇₅(Mn_0.05Zn_0.95Fe₂O₄)₂₅ electrode material was exposed to a gravimetric specific capacitance of 646.9 F/g at a scanning rate of 5 mV/s. Moreover, an asymmetric supercapacitor (ASC) device was constructed, achieving a specific energy of approximately 47 W·h·kg⁻¹ and a power density of 4937.1 W/kg, respectively. An excellent capacitance retention of 128.9% and coulombic efficiency of 99% were observed after 6000 GCD duty cycles. This study confirmed the good stability of the MXene@MZF₁ electrode compound after experimental and theoretical investigations. Therefore, MXene-based MZF₁ electrode materials enhanced electrochemical properties and improved cyclic durability for the ASC device.