title: Chlorine-doped reduced graphene oxide nanosheets as an efficient and stable electrode for supercapacitor in acidic medium.
abstract: We demonstrate the efficient doping of reduced graphene oxide (RGO) by Chlorine and its capacitive performance was calculated by cyclic voltammetry and charge-discharge cycling in 1M H2SO4 solution. In this regard, we are prepared RGO nanosheets through a simple, eco-friendly and efficient electrochemical method, with selectively functionalized edges by chlorine which involves added the RGO to the halogen-containing acid solution and dispersed by ultrasonic. After synthesis, Cl-RGO is characterized using X-ray diffraction, Raman spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, Energy-dispersive X-ray (EDX) spectroscopy and tunneling electron microscopy. FTIR spectra show the chlorine-containing functional groups. Energy-dispersive X-ray spectroscopy analysis confirmed the presence of doped chlorine in RGO. Raman spectroscopy shows a high density of defects in the RGO layer. Electrochemical characteristics of Cl-RGO are characterized by cyclic voltammetery, galvanostatic charge/discharge and electrochemical impedance spectroscopy. According to the galvanostatic charge/discharge analysis, Cl-RGO represents specific capacitance (Cs) of 178.4Fg(-1) at current density of 1Ag(-1), which is higher than that of RGO (100.5Fg(-1)) in H2SO4 solution.
authors.affiliation: Department of Physical Chemistry and Nano chemistry, Faculty of Science, University Of Maragheh, P.O. Box. 55181-83111, Maragheh, Iran. Electronic address: kakaei@maragheh.ac.ir.
authors.forename: Karim
authors.initials: K
authors.lastname: Kakaei
authors.affiliation: Department of Physical Chemistry and Nano chemistry, Faculty of Science, University Of Maragheh, P.O. Box. 55181-83111, Maragheh, Iran.
authors.forename: Milad
authors.initials: M
authors.lastname: Hamidi
authors.affiliation: Department of Physical Chemistry and Nano chemistry, Faculty of Science, University Of Maragheh, P.O. Box. 55181-83111, Maragheh, Iran.
authors.forename: Somayeh
authors.initials: S
authors.lastname: Husseindoost
keywords: Chlorine-doped; Electro-synthesis; Electrochemical performance; Reduced graphene oxide; Supercapacitor