Electrochemical performance of Mg3V2O8 nanoparticles for asymmetric supercapacitor

Abstract

Designing the efficient and durable electrode materials for energy storage devices is in high demand. In this work, magnesium orthovanadate (Mg3V2O8) nanoparticles are successfully synthesized by simplest and most adoptable coprecipitation method. Further, the prepared Mg3V2O8 nanomaterial is systematically characterized and discussed by various characteristic techniques. Thereafter, Mg3V2O8 nanomaterial is used as electrode material for supercapacitor in LiOH and KOH electrolytes. The high specific capacitance of 340 and 810 F g−1 are obtained in LiOH and KOH electrolytes, respectively at the current density of 1 A g−1. Due to the high electrochemical performance in KOH electrolyte, the supercapacitive performance of Mg3V2O8 is discussed in KOH electrolyte in detail. Furthermore, aqueous asymmetric supercapacitor is designed by Mg3V2O8 (positive electrode) and activated carbon (AC) (negative electrode). Mg3V2O8//AC achieves the high energy density of 36.94 W h kg−1 at the power density of 750 W kg−1. Moreover, four red color LEDs, toy motor fan, digital humidity meter and kitchen timer are powered separately by series connected two aqueous asymmetric supercapacitors. © 2025 Elsevier Ltd