▎ 摘　　要

Ternary nanocomposites have attracted increasing attention as efficient supercapacitor electrode materials. Here we report, the synthesis of a ternary hybrid nanocomposite by the introduction of crystalline RuO2 nanoparticles loaded carbon nanocoils (CNCs) as spacers in reduced graphene oxide (RGO). The RGO-(RuO2/CNCs) composite electrode exhibits a high specific capacitance of 725 Fg (1) at a scan rate of 20 mV s (1) in three-electrode configuration. When used in symmetric two electrode configuration, it shows a specific capacitance of 436 Fg (1) at a constant current density of 1 A g (1) which is nearly three times higher than that of pure RGO based electrode. An aqueous asymmetric supercapacitor fabricated using RGO-(RuO2/CNCs) as the positive electrode and RGO as the negative electrode is operational in an electrochemically stable potential window of 2 V. The asymmetric capacitor exhibits a high energy density of 45 Wh Kg (1) at a power density of 1 kW kg (1) and retains an energy density of 41 Wh Kg (1) even at a high power density of 40 kW kg (1). (C) 2017 Elsevier Ltd. All rights reserved.