Polyaniline Nanotubes- Reduced Graphene Oxide Composite for HighPerformance Supercapacitor

Supercapacitors (SCs), as high power density energy storage resources, have recently attractedconsiderable attention1, 2. Among the vast majority of supercapacitive materials, polyaniline(PANI) with different morphologies2 has been considered as one of the active materials due to itsintrinsic high redox active-specific capacitance and flexibility3, 4. In this work, we report asupercapacitor fabricated from PANI rectangular nanotubes that was chemically synthesized by asimple and convenient method. This special shaped PANI composited with graphene oxideprepared with the Hummer method, and then GOES reduced to RGO to compose PANI-RGOcomposite. The obtained composite was drop-casted on a glassy carbon electrode (GCE) as acurrent collector. The structural analysis and morphological investigations revealed the formationof PANI rectangular tubes. PANI/RGO supercapacitor possesses a specific capacitance of 855F/g at 1 A/g current density. The rate capability of the electrode tested at different currentdensities from 1 to 20 A/g shows an good specific capacitance of 586 F/g at a current density of20 A/g. The capacitance retention over the long-term galvanostatic charge/discharge (CD) cycleswas evaluated and the electrode was found to retain 81% of its capacitance even after 5000cycles

Keywords:

Supercapacitor , Polyaniline nanotube , High capacity , RGO , High rate