Antimony vanadate spheres: Synthesis, characterizations, and use as positive electrode in asymmetric supercapacitor systems

Abstract

A straightforward wet chemical technique was employed to design and synthesize microstructured SbVO4, and its structural and surface morphological properties were examined using various analytical techniques. The electrochemical performance of SbVO4 NPs was studied using chronopotentiometry, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The electrode exhibits a specific capacitance (Csp) of 384 Fg−1 at 5 mVs−1, showcasing rapid Faradic redox reactions and efficient charge transfer even at higher scan rates. The relationship between scan rates, Csp, and current densities reveals promising kinetics, with the Csp increasing as the scan rate decreases. The SbVO4 electrode maintains a high capacitance retention of 91 % after 6000 GCD cycles, highlighting exceptional cycling stability. The SbVO4//AC asymmetric device, constructed to assess practicality, displays distinct CV profiles and remarkable reversibility at various scan rates. The device achieves a Csp of 62 Fg−1 at 1 Ag−1, with 84 % capacitance retention after 5000 GCD cycles. A Ragone plot illustrates the device's energy density of 22.04 Whkg−1 and power density of 793.4 Wkg−1, affirming the effectiveness of SbVO4//AC as a robust electrode material for SCs in practical applications.