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

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 (C_sp) 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, C_sp, and current densities reveals promising kinetics, with the C_sp 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 C_sp 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.