Hydrothermal synthesis of La2O3-ZnO nanocomposites as electrode material for asymmetric supercapacitor applications

Bimetallic nano composite has gained more interest than monometallic nano particle due to their improved electrochemical characteristics. In the present work hydrothermally synthesised bi metallic nano composites (La2O3-ZnO) are studied for energy storage application. The conducted physico-chemical characterization results strongly revealed the phase formation of La2O3-ZnO nanocomposite material. The cyclic voltammetry results estimate a maximum specific capacitance of 615 F/g at 5 mV/s for the prepared composite. The electrochemical impedance spectroscopy establishes the solution and charges transfer resistance as 0.53 & omega; and 0.309 & omega;, respectively. The galvanostatic charge-discharge studies reveal prolonged charging and discharging and better rate capability. The cyclic stability of the La2O3-ZnO nanocomposites achieved higher cyclic capacity and capacitive retention of 85% even after 2000 cycles. The nanocomposites (La2O3-ZnO) exhibited good electrochemical performance in asymmetric supercapacitor device application with superior energy (26.53) wh/kg and power density (1350) w/kg with better cyclic stability and capacitive retention of 77.5% even after 1000 cycles.