Surface active sites enriched CoNiFe-Manganite: An effective electrode for high-performance supercapacitors

The electrochemical performance of ternary metal oxide electrodes exhibiting faradic battery-type characteristics, represents a promising and desirable solution for addressing the ongoing energy crisis. In the current investigation, we present the optimized solution-combustion synthesis of Co _0.03Ni _0.97Fe _γMn _2-γO ₄ nanoparticles, with varying Fe concentrations (γ=0.01, 0.05, 0.10 %), specifically tailored for application in supercapacitors. The Styrofoam-natured (CNMFO:1) exhibited outstanding specific capacitance, reaching 489.12 Fg ⁻¹ at a scan rate of 50 mVs ⁻¹. Moreover, validation through galvanostatic charge-discharge (GCD) investigations substantiated a notable specific capacitance of 391.41 Fg ⁻¹, achieved at a current density of 1Ag ⁻¹. In addition, the CNMFO:1 electrode demonstrated remarkable cyclic stability, retaining 83.87 % of its initial performance over 6000 cycles. Similarly, the fabricated asymmetric device of (CNMFO:1||AC) also demonstrated a maximum specific capacitance of 33.86 Fg ⁻¹ under a current density of 1Ag ⁻¹, which exhibits good energy and power density of 10.52 Wh Kg ⁻¹ and 749.34 W Kg ⁻¹ respectively. From the overall observation, the CNMFO:1 electrode exhibited notable cyclic stability and electrochemical reversibility. This research recommends that CNMFO:1 nanocomposite have an extraordinary potential for evolution of active electrode materials forthcoming supercapacitors in energy storage system.