Herein, we report a preparation method of a novel binary hybrid nanocomposite based on polyaniline (PANI) and a-MnO 2 nanotubes (MNTs) by in situ polymerization. The polymerization is carried out in acidic medium using a-MnO 2 nanotubes as oxidant. A symmetrical supercapacitor is fabricated and the electrochemical performance of the supercapacitor is investigated by cyclic voltammetry (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS) techniques using 1.0 M H 2 SO 4 as electrolyte. The nanocomposite shows maximum specific capacitance of 626 F g À1 and corresponding energy density of 17.8 W h kg À1 , as calculated from the charge-discharge curve at a specific current density of 2 A g À1 in the potential range 0-0.7 V.

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Nitrogen-containing hierarchically porous carbon is derived by carbonizing and activating polypyrrole nanostructure (APNP) using a template-free synthesis method and is demonstrated to be an efficient counter electrode (CE) in dye-sensitized solar cells (DSSCs).

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