Graphene nanoscrolls as a symmetric supercapacitor electrode

Abstract

The current investigation delineates a straightforward solvent exchange approach for the production of one-dimensional (1D) graphene nanoscrolls (GNS), originating from graphite extracted from pencil lead. The proposed rolling mechanism incorporates the utilization of two distinct solvents: N-methyl-2-pyrrolidone (NMP) boasting a high boiling point and ethanol featuring a low boiling point. The electrochemical assessment of GNS unveiled a remarkable specific capacitance of 438 F/g at a low scan rate of 10 mV/s, coupled with a high-power density of 4447 W Kg-1 and an energy density of 21 Wh Kg-1. A comprehensive analysis of electrochemical performance was conducted through cyclic voltammetry, galvanostatic charge/storage, and electrochemical impedance spectroscopy techniques. The results posit GNS as a highly promising candidate for the advancement of sophisticated electrode materials in the upcoming generation of energy storage devices, attributed to its facile synthesis, distinctive morphology, and exceptional specific capacitance.