High-performance aqueous hybrid supercapacitor applications enabled by MgV₂O₆/MXene

The ever-growing demand of advanced energy storage system has spurred efforts to develop an environmentally friendly, highly desirable and capable electrode material for sustainable development. In this work, micro structured MgV₂O₆is successfully synthesized by simple hydrothermal method. MgV₂O₆microrods are characterized by various techniques to investigate the structural, optical and surface morphological characteristics. Thereafter, prepared MgV₂O₆microrods are used for supercapacitor. The resultant electrode material delivers the high specific capacitance of 491 F g⁻¹at the current density of 1 A g⁻¹. However, MgV₂O₆itself shows high capacitance and redox-active sites, the capacitive storage performance can be again enhanced by integrating MgV₂O₆with MXene (Ti₃C₂). Therefore, to improve the capacitance of MgV₂O₆microrods, MgV₂O₆/MXene composite is prepared and, improved specific capacitance of 788 F g⁻¹is received from MgV₂O₆/MXene. Furthermore, aqueous hybrid supercapacitor (HSC) is fabricated by MgV₂O₆/MXene (cathode) and activated carbon (AC) (anode). MgV₂O₆/MXene//AC delivers the high energy density of 47.43 W h kg⁻¹at the power density of 800 W kg⁻¹. Moreover, to justify the feasibility of the device in electronic field, five green color light-emitting diodes (LEDs), digital thermometer/humidometer, digital timer and toy motor fan are operated by series connected two MgV₂O₆/MXene//AC devices.