Karim Kakaei - Department of Physical Chemistry, Faculty of Science, University of Maragheh,Maragheh,Iran
Milad Hamidi - Department of Physical Chemistry, Faculty of Science, University of Maragheh,Maragheh,Iran
Somayeh Husseindoost - Department of Physical Chemistry, Faculty of Science, University of Maragheh,Maragheh,Iran

Heteroatom doping has been proven as an effective way to tailor the properties of graphene andrender its potential use for energy storage devices. In this work, we report a facile method tosynthesis of reduced graphene oxide (RGO) from graphite electrodes using ionic liquid-assistedelectrochemical exfoliation and the competent doping of RGO by Chlorine (Cl-RGO) in solutionphase. Its capacitive performance was calculated by cyclic voltammetry and charge–dischargecycling in 6M KOH solution. The characterization of synthesized catalysts has been investigationby FT-IR, Raman, XRD and XPS techniques. We have evaluated the effectiveness of doping andperformed by electrochemical measurements (involving cyclic voltammetry, galvanostaticcharge/discharge and electrochemical impedance spectroscopy). It was found that the chlorinegroups making the as-prepared Cl-RGO exhibited remarkably enhanced electrochemicalperformance when used as electrode materials in supercapacitors. The supercapacitor based onthe Cl-RGO exhibited a high specific capacitance of 180.5 F g-1 at current density of 1 A g-1 andremains a relatively high capacitance even at a high current density more than RGO.

Reduced graphene oxide, Supercapacitor, Charge/Discharge, Chlorine doping