Covalent surface modification of chemically derived graphene and its application as supercapacitor electrode material

Physical Chemistry Chemical Physics Pub Date: 2014-02-06 DOI: 10.1039/C3CP54510E

Abstract

A simple and effective method using 6-amino-4-hydroxy-2-naphthalenesulfonic acid (ANS) for the synthesis of water dispersible graphene has been described. Ultraviolet-visible (UV-vis) spectroscopy reveals that ANS-modified reduced graphene oxide (ANS-rGO) obeys Beers law at moderate concentrations. Fourier transform infrared and X-ray photoelectron spectroscopies provide quantitative information regarding the removal of oxygen functional groups from graphene oxide (GO) and the appearance of new functionalities in ANS-rGO. The electrochemical performances of ANS-rGO have been determined by cyclic voltammetry, charge–discharge and electrochemical impedance spectroscopy analysis. Charge–discharge experiments show that ANS-rGO is an outstanding supercapacitor electrode material due to its high specific capacitance (375 F g?1 at a current density of 1.3 A g?1) and very good electrochemical cyclic stability (～97.5% retention in specific capacitance after 1000 charge–discharge cycles). ANS-rGO exhibits promising characteristics with a very high power density (1328 W kg?1) and energy density (213 W h kg?1).

Graphical abstract: Covalent surface modification of chemically derived graphene and its application as supercapacitor electrode material
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