▎ 摘　　要

In this study, micro-plasma discharge is produced by applying a high electric potential between graphite and Pt electrodes in acetonitrile solvent. The electrons generated in the micro-plasma discharge collide with acetonitrile and produce H-center dot and (CH2CN)-C-center dot radicals. The radicalized graphene layer exfoliated from the graphite electrode reacts with nascent hydrogen (H-center dot) and acetonitrile ((CH2CN)-C-center dot) radicals and partially restores its aromaticity and conjugation. Raman spectra of the product confirm the synthesis of nitrogen-functionalized graphene (N-FG), which has a marginal increase in disorderness compared to that of pure graphite and remarkable dispersibility in both hydrophilic and hydrophobic solvents. The excellent fluorescence properties of N-FG confirm the presence of fluorophores such as -NH and -N= C- at the radicalized graphene sites, as supported by ultraviolet-visible spectroscopy and X-ray photoelectron spectroscopy studies. The functional groups present in N-FG lead to excellent electrochemical performance, with distinct redox peaks in cyclic voltammetry and a high specific capacitance of 291 F g(-1) at a scan rate of 5 mV s(-1). N-FG exhibits excellent cycling stability, with a marginal reduction of specific capacitance (<10% reduction) at the end of 1000 cycles.