Abstract
Perovskite oxide of calcium stannate CaSnO3 (CSO) and Bi-doped Bi0.05Ca0.95SnO3 (BCSO) materials were successfully synthesized via a hydrothermal route followed by thermal treatment. The effect of bismuth doping (0.05 wt%) to the CaSnO3 and the corresponding morphology, conductivity and the electrochemical properties were investigated as electrode material for supercapacitor application. Structural characterization confirmed the formation of single-phase orthorhombic structure of Bi0.05Ca0.95SnO3. Microscopic image exhibited the growth of Bi0.05Ca0.95SnO3 due to the incorporation of bismuth ion in CaSnO3. Doping of bismuth improved the electrical conductivity and ion exchange interaction along Bi to Sn via oxygen bridge (Bi-O-Sn) networks, and that boost the pseudocapacitive process in Bi0.05Ca0.95SnO3. Fabricated BCSO electrode showed maximum specific capacitance value of similar to 193 F/g and similar to 162.8 F/g at 5 mV/s and at 1.0 A/g, respectively. A symmetric split-cell (BCSO//BCSO) demonstrated a specific capacity of similar to 53.3 mAh/g at 10 mV/s and similar to 73.3 mAh/g at 0.5 A/g, while maintaining excellent capacity retention of similar to 94% of its initial value at 1.0 A/g after 2000 cycles. The cell attained a maximum energy density of similar to 88.0 Wh/kg at a power density of similar to 2.10 kW/kg under a current density of 0.5 A/g. This study opens a new path to enhancing the electrochemical performance of perovskite oxide-based materials for energy storage devices.