Cubic like CoMn2O4 nanostructures as advanced high-performance pseudocapacitive electrode

Abstract

In this work, a synthesis of cubic-like CoMn2O4 uniform nanostructures with KOH-NaOH involved in the hydrothermal method has been reported. The crystal structure phase purity, functional groups, and morphology of the CoMn2O4 have been investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM) analyses. The electrochemical behaviour of CoMn2O4 electroactive material has been examined for supercapacitors. The electrode displays excellent capacitive behaviour with superior electrochemical properties. The cubic-like morphology structure with enough free space is beneficial for improving electrochemical performance. The CoMn2O4 electrode exhibits a faradaic capacitance with the highest specific capacitance value of 762.4 F g-1 at a scan rate of 5 mV s-1. The coulombic efficiency of the CoMn2O4 electrode was found to be 91.2 % after 2000 charging-discharging cycles. The nanostructures of CoMn2O4 make a prominent contrib0-ution to the excellent electrochemical performance of the prepared electrode.