The growing interests about multifunctional electronic devicesand hybrid vehicles need advanced electrochemicalenergy storage gadgets with high-performance and low-costelectrode materials [1,2]. Nowadays, supercapacitors havegained significant attention because of their notable characteristicslike high power density, fast charge-discharge rates,good reversibility, long cycle life, etc. [3e6]. However, supercapacitorsare restricted for the application as primary energy