Preparation of high-capacitance nitrogen-doped graphene oxide from graphene derived from Sri Lankan vein graphite

Abstract

Supercapacitors excel at energy storage due to their rapid charging, long lifespan, wide temperature range, low maintenance, and safety, supplementing batteries with high power density and fast charging for a variety of applications. The goal of this research is to create high-performance supercapacitor electrodes using Sri Lankan vein graphite-derived nitrogen-doped graphene oxide (NGO). Nitrogen doping’s effect on the electrical structure and density of states in graphene being investigated in order to potentially improve charge carrier density. Activation of the graphene oxide (GO) precursor yields activated grapheme oxide (AGO), which is then thermally annealed using ammonia and urea as nitrogen sources. Physicochemical analysis, including SEM, FTIR, and EDX, confirms nitrogen doping, decreased stacking, and increased interlayer spacing in NGO. N-Ammonia-AGO and N- Urea-AGO have higher specific capacitance than AGO, with N15 Ammonia AGO (1:15 w/w) demonstrating the highest at 180.53 Fg-1 .