Supercapacitor performances of RuO2/MWCNT, RuO2/Fullerene nanocomposites

Abstract

In this study, RuO2/Fullerene and RuO2/MWCNT nanocomposites were synthesized to use as an electroactive materials in symmetric supercapacitor device performances. The materials were examined via Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR), thermo-gravimetric analysis (TGA-DTA), scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDX), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS). The RuO2/MWCNT and RuO2/Fullerene nanocomposite electrodes show good electrochemical performances. For instance, the highest specific capacitance of RuO2/Fullerene and RuO2/MWCNT electrodes reaches C-sp = 3895.11 and 1662.19F/g at 1mV/s within the potential range of 0.8 V in 1 M H2SO4 solution. RuO2/MWCNT and RuO2/Fullerene nanocomposites have good cycle stability similar to 100% specific capacitance at [RuO2](o)/[MWCNT](o) = 1:1; 2:1 and [RuO2](o)/[Fullerene](o) = 2:1, respectively. The different equivalent circuit models of LR(1)Q(C1R2) and LR1(Q(1)R(2))(Q(2)R(3)) were used to interpret EIS data.