Ultra high stable supercapacitance performance of conducting polymer coated MnO2 nanorods/rGO nanocomposites

Abstract

A ternary nanocomposite that consists of MnO2 nanorods and reduced graphene oxide sheets supported on poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) polymer has been developed for supercapacitor applications. X-ray diffraction, field emission scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, the Brunauer-Emmett-Teller method and X-ray photoelectron spectroscopic analysis confirmed the formation of a ternary nanocomposite of PEDOT:PSS/MnO2 nanorods/rGO. Electrochemical investigation of these materials in acetonitrile containing lithium per chlorate demonstrated an enhanced specific capacitance of 633 F g−1 at a current density of 0.5 A g−1 and 100% stability up to 5000 charging-discharging cycles at 1 A g−1. The enhanced capacitance and working stability of the PEDOT:PSS/MnO2 nanorods/rGO nanocomposite along with the simplicity in making the active materials make this system a promising candidate for the commercial development of supercapacitors.