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A polyindole-MnO 2  (PIn-MnO 2 )/reduced graphene oxide (RGO)-based ternary composite system has been assembled by an in-situ polymerization. In this system, the concentration of RGO has been varied by the interval of 0.25 wt.% in fixed quantity of PIn-MnO 2  system. The mean crystallite size of RGO was observed to be 6.64 nm calculated by using Debye–Scherrer formula. This study demonstrates the dispersion of RGO nanoparticles in PIn-MnO 2  system to optimize the supercapacitive properties. As expected, the supercapacitive properties of PIn-MnO 2 -RGO composites were influenced by the addition of RGO nanoparticles and it is optimized for 0.5 wt.% of RGO concentration. The 0.5 wt.% RGO-loaded PIn-MnO 2 -RGO composite shows specific capacitance of the order 1750 Fg −1  at a scan rate of 50 mV s −1 . The main accomplishment of present work is that the 0.5 wt.% RGO-loaded composite shows long-term stability, which is capacitance retention up to 6000 cycles. Similarly, galvanostatic charge/discharge curves of 0.5 wt.% RGO-loaded composite show long and nearly symmetric behavior, which is suitable for range of practical applications.

Preparation of Polyindole-MnO 2 /Reduced Graphene Oxide-based Ternary Composite System for Supercapacitive Application