Electrochemical performance of Mg₃V₂O₈ nanoparticles for asymmetric supercapacitor

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.