Robust fabrication of silver pyro-vanadates via sonochemical approach for advanced energy storage application

Abstract One of the major challenges in the twenty-first century is the development of ultrahigh performance electrical energy storage (ES) devices with faster, safer, and more efficient ES materials. Herein, we report newly designed silver vanadates (Ag4V2O7), which serve as significant electrode material for upcoming ES devices due to its greater electrical conductivity as well as electrochemical activity. Ag4V2O7 were synthesized by the ultrasonication method. The as-synthesized material was characterized with various spectral as well as analytical methods. Furthermore, the supercapacitive property of Ag4V2O7 was evaluated using different electroanalytical techniques. The Ag4V2O7 electrode exhibited well electrochemical performance with a specific capacity (Csp) of 548 C g-1 at the current density of 1 Ag-1 and significant capacity retention of 88.7% even after 5000 GCD cycles at 6 Ag-1. The lowest value of charge transfer resistance (Rct = 4.12 Ω), and equivalent series resistance (ESR =6.33 Ω) exposed the faster reaction kinetics. The superior electrochemical performance was ascribed to its unique structure, which contributes to high conductivity, easy electron transfer, short ion diffusion distances, fast kinetics as well as a huge number of active sites in the electrode material. The electrochemical results demonstrated that Ag4V2O7 could be utilized as electro-active material for advanced energy storage systems.