Chen et al. reported the three-dimensional graphitic carbon nitride functionalized graphene composites (g-C3N4@G) through a one-step hydrothermal reduction method as a symmetric supercapacitor electrode in two electrode configurations using 0. showed the SBET of 250 m 2 g -1 , which is much larger than that of pure Ni(OH)2 (63 m 2 g -1 ), and indicated the advantage of CNRG to avoid the aggregation of Ni(OH)2 and enable large number of active sites. The prepared materials were fabricated as electrodes and their electrochemical properties were evaluated using three-electrode cell arrangement in 6 M KOH aqueous solution. The CNRG/Ni(OH)2 composite electrode displayed the higher specific capacitance of 1785 F g -1 at 2 A g -1 with a capacitance retention of 71.3% after 5000 charge-discharge cycles.