Facile Synthesis of Mn2O3 as an Electrode Material for Supercapacitor Application

Manganese (III) oxide (Mn2O3 ), a transition metal oxide, is well-known for its characteristics properties and potential application in various fields including catalysis, energy storage and sensing. Herein we report a cost-effective sol-gel method for the synthesis of Mn2O3 nanoparticles using manganese nitrate (Mn(NO3 ) 2 .4H2O) in 100 ml of ethylene glycol for the supercapacitor application. The assynthesized materials were confirmed by various physicochemical techniques like FTIR, XRD and BET surface area. Morphological research using SEM showed higher surface area and porousness with a uniform distribution of particles. The prepared electrode materials were deposited on a nickel foam substrate to investigate the electrochemical properties in 1 M KOH electrolyte. The galvanostatic charge/ discharge (GCD), cyclic voltammetry (CV), and complex impedance studies confirmed excellent specific capacitance and capacitive behavior of the prepared material. The synthesized Mn2O3 exhibited an excellent specific capacitance of 75.28 F/g and 35.28 F/g at a scan rate of 5 mV/s with two different temperatures 500 and 7000C. The high porosity of the materials provided a better electrolyte-electrode interface with a larger specific area, thus suggesting its suitability for energy storage applications.