 The study synthesized tris, hydroxymethyl, aminomethane functionalized graphene oxide, G0 at T, as an electrode material for supercapacitors, which exhibited a specific capacitance of 549.8 FG1 at a specific current of 2.5 AG1 and a specific capacitance of 358 FG1 at a specific current of 7 AG1 in the potential range of 0.5 to 0.5 V versus AG AGCl, with high cyclic stability. Density functional theory calculations were used to investigate the quantum capacitance, free energy change during functionalization reaction, and the layered distance of G0 and G0 at T. This article was authored by Sameer Mohamedi and Esmortes Mousavi-Koshtal.