Advanced energy conversion and storage (ECS) devices (including fuel cells, photoelectrochemical water splitting cells, solar cells, Li-ion batteries and supercapacitors) are expected to play a major role in the development of sustainable technologies that alleviate the energy and environmental challenges, we are currently facing. The successful utilization of ECS devices depends critically on synthesizing new nanomaterials with merits of low cost, high efficiency, and outstanding properties. Supercapacitors are strongly attracted due to their magnificent use in electric vehicles and many appliances those are being used in day to day life. Supercapacitor is a charge storage device which has high energy density than conventional capacitor and high power density than batteries.