Rational design of cobalt-infused styrofoam nickel manganese oxide: Unlocking unprecedented capacitance for supercapacitor applications

Abstract

Advancement in low to high-power device technology requires smart solutions for the energy-storing property of the devices. The Pseudo-capacitor with battery-type charge storing discharging mechanism can possess a high energy density. In this study, we present the synthesis of combustion-derived AxNi1-xMn2O4 (A = Co, Cu, Zn, & X = 0.01, 0.02, 0.03) nanoparticles for supercapacitor application. Among all the electrode materials studied, the Styrofoam structure of Co0.03Ni0.97Mn2O4 (3CoNMO) exhibited an utmost specific capacitance of 747.42 F/g at 50 mV/s, and galvanostatic charge/discharge (GCD) studies confirmed that the 3CoNMO has an outstanding specific capacitance of 746.76 F/g at 1 A/g. Moreover, the 3CoNMO exhibits remarkable cyclic stability retention (89.26%) after 10,000 continuous cycles at 10 A/g. Similarly, the asymmetric supercapacitor device was fabricated for the optimized working electrode, and the (3CoNMO||AC) delivers an outstanding specific capacitance of 31.85 F/g at a specific current density of 1A/g, it provides energy and power density of 11.25 WhKg−1 and 847.45WKg-1. The results highlighted that Co0.03Ni0.97Mn2O4 nanoparticle as an auspicious nominee for supercapacitor applications and exhibit good long-term stability.