Facile Synthesis of Sodium Titanate Nanosheets as Promising Electrode Material for High Power and Energy Density Supercapacitors

ABSTRACT Sodium titanate nanosheet‐based electrode material is prepared via a solid‐state high‐temperature sintering method, and its energy storage performance is evaluated for supercapacitor applications. The material characterization studies confirmed the formation of sodium nanosheets, and the electrochemical studies (three‐electrode system) exhibit excellent charge storage performance by achieving the specific capacitance of 670 F/g @ 1 A/g, and 175 F/g@10 A/g along with adequate stability (5000 cycles), coulombic efficiency (∼98.5%), and capacitance retention (∼99.0%). Moreover, an asymmetric supercapacitor (ASC) energy storage system (two‐electrode) was constructed using NTO nanosheets and activated carbon (AC), which exhibits the energy density of 16 Wh/kg and power density of 6500 W/kg @10 A/g with 10000 cycles of stability.