Strategic integration of MXene into FeMnO3 matrix for superior energy density in hybrid supercapacitors elucidated via Dunn’s model

Abstract

Integration of carbonaceous materials with transition metal oxides has emerged as a promising avenue across various application, particularly in the framework of energy storage. To develop efficientelectrodes having higher ECperformance metric by utilizing the economically sustainable materials are the bottleneck of this field. Here, we report the synthesis of FeMnO3 (FMO) and its composite with 10, 20, and 30% MXene/Ti3C2 contents(denoted as FMO-I, FMO-II, and FMO-III respectively)byemploying facile hydrothermal and solvothermal methods,respectively. Structural analysis showed that FMO exhibits a well-defined cubic crystal structure with high crystallinity, while morphological investigation exposed the flake and thread-like structures contributing to increased porosity. Cyclic voltametric measurements conducted having a potential window of 0.0-0.5 V, with scan rates spanning from 2.5 to 25 mV/s, validated the hybrid type nature of the FMO/Ti3C2 electrodesbased on Dunn’s model. Meanwhile, FMO-IIIdemonstrated a noteworthy specific capacity of 1084.81 C/g at a current density(J) of 3.22A/g, which aligns closely withtheoretical capacity of 1215.33