Synthesis of Highly Conductive PPy/Graphene/MnO 2 Composite Using Ultrasonic Irradiation.

Highly conductive polypyrrole/graphene/manganese dioxide (PPy/graphene/MnO2) composites are fabricated via ultrasonic irradiation using p-toluenesulfonic acid as a dopant. The microstructures of PPy/graphene/MnO2are evidenced by the SEM and TEM examinations. The effects of the graphene and MnO2loading on the electrical conductivity are investigated. The maximum conductivity of PPy/graphene/MnO2composites about 17.15 S/cm found with 3 wt% graphene and 48.7 wt% MnO2at room temperature. Such uniform structure together with the observed high conductivities afforded high specific capacitance. A specific capacitance of as high as 258 F/g at a current density of 1 A/g was achieved over the PPy/graphene/MnO2composite. [ABSTRACT FROM AUTHOR]