“…Currently, the preparation of cost-effective electrode materials has become great challenge for supercapacitor applications. Cheap metal oxides such as oxides of Co, Ni, Mn, In, Fe, Sn, Pb [14,15] and so forth are being investigated to improve the capacitance value of the capacitors. The conducting polymers are also used as electrode materials for supercapacitors for its excellent electrochemical properties and low cost.…”