Work

High-performance graphene oxide electrode synthesized via modified Hummer's method for supercapacitor application

Year: 2025

Type: article

Abstract: Graphene oxide (GO) was synthesized via the modified Hummers method and characterized using SEM, TEM, EDS, XRD, and UV-Vis spectroscopy to assess its morphology and chemical composition. The structural, morphological, and electrochemical properties of GO were evaluated, with a focus on its performance in supercapacitor applications. Electrochemical studies, including CV, GCD, and EIS, revealed efficient charge storage and rapid electron transfer, with the GO electrode exhibiting a specific capacitance of 147 F/g at 5 mV/s, and energy and power densities of 14.90 Wh/kg and 242.04 W/kg, respectively, at 1.0 mA. The GO/PVA/GO symmetric device exhibits efficient capacitive behavior with rapid, stable charge-discharge performance. CV curves remain quasi-rectangular up to 150 mV/s, and GCD shows rapidly decreasing discharge times with increasing current, indicating fast electrochemical kinetics. EIS confirms low series resistance and charge-transfer resistance, demonstrating good ionic conductivity and strong potential for stable, high-performance supercapacitor applications. Graphene oxide (GO) coated Ni-foam electrode and its electrochemical evaluation in a three-electrode system. • Synthesis and comprehensive characterization of Graphene Oxide nanoparticles confirming their structural and morphological properties. • Detailed electrochemical investigation of GO, revealing high charge storage capacity and rapid electron transfer kinetics. • Demonstration of GO as a promising supercapacitor electrode, exhibiting excellent specific capacitance (147 F/g) and energy/power densities.

Source: Chemistry of Inorganic Materials

DOI: 10.1016/j.cinorg.2025.100135