کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6472084 | 1424126 | 2017 | 10 صفحه PDF | دانلود رایگان |
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 F gâ1 at a scan rate of 20 mV sâ1 in three-electrode configuration. When used in symmetric two electrode configuration, it shows a specific capacitance of 436 F gâ1 at a constant current density of 1 A gâ1, 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 Kgâ1 at a power density of 1 kW kgâ1 and retains an energy density of 41 Wh Kgâ1 even at a high power density of 40 kW kgâ1.
Schematic and SEM image of RGO-(RuO2/CNCs) composite and schematic of the RGO-(RuO2/CNCs)//RGO asymmetric capacitor.191
Journal: Electrochimica Acta - Volume 231, 20 March 2017, Pages 539-548