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 energysources to replace batteries because of their relatively lowenergy density. Therefore, it is necessary to explore advancedtechnology to enhance the energy density of supercapacitorswithout compromising their power density. More efforts havebeen made to improve the energy density and specificcapacitance by developing nanostructured electrode materials[7,8].The main solution to improve the electrochemical performanceof supercapacitor is to build asymmetric supercapacitor,which can explore to deliver high energy and power