Synthesis and Characterization of rGO-Anchored MnO2 Nanorods and their Application in Supercapacitors as Electrode Material

Abstract

Supercapacitors have been given significant consideration as advanced energy storage devices owing to their rapid charging capabilities, exceptional stability, and high retention performance, aligning with the demands of modern technologies. In the current investigation, a hybrid nanocomposite containing MnO₂ nanorods anchored onto reduced graphene oxide (rGO) was made via a hydrothermal route, demonstrating superior supercapacitive behavior. The nanocomposite was extensively characterized through functional, structural, morphological, and electrochemical analyses, and subsequently utilized as supercapacitor electrode material. Electrochemical evaluations were conducted in a 3-electrode system using the electrolyte of 1 M Na₂SO₄, revealing an impressive specific capacitance of about 398 F g^-1. Notably, the electrode exhibited remarkable long-term stability, with a retention value of 94% after 5000 charge–discharge cycles. These results position the rGO-MnO₂ hybrid as an auspicious candidate for future supercapacitor applications.