A facile synthesis of calcium manganese oxide for supercapacitor application

Abstract

In this work, an alkaline earth metal cation doped transition metal oxide namely, calcium manganese oxide (CMO) was prepared by a cost effective co-precipitation method at two different temperatures and investigated its suitability for supercapacitor application. XRD and FT-IR spectroscopy were utilized to examine the phase and bonding properties of the as-prepared CMO materials, whereas morphological characteristics were analysed by SEM and TEM. The electrochemical performance of the CMO-B (calcinated at 800 °C), reveals a higher specific capacitance of 247 F g⁻¹ at a scan rate of 5 mV s⁻¹ and 327 F g⁻¹ at a current density of 1 Ag⁻¹ respectively than CMO-A (calcinated at 700 °C). The fabricated symmetric supercapacitor of CMO-B delivered an energy density of 16.7 Whkg⁻¹ with a power density of 2398 Wkg⁻¹ at a current density of 1 Ag⁻¹. The cyclic stability studies show initial specific capacitance of 100% over 10,000 cycles with coulombic efficiency of 101% at current density of 5 Ag⁻¹. These results reveal that the CMO-B is a promising electrode material for supercapacitor application.