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

Abstract

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 MgV2O6 is successfully synthesized by simple hydrothermal method. MgV2O6 microrods are characterized by various techniques to investigate the structural, optical and surface morphological characteristics. Thereafter, prepared MgV2O6 microrods are used for supercapacitor. The resultant electrode material delivers the high specific capacitance of 491 F g- 1 at the current density of 1 A g- 1. However, MgV2O6 itself shows high capacitance and redox-active sites, the capacitive storage performance can be again enhanced by integrating MgV2O6 with MXene (Ti3C2). Therefore, to improve the capacitance of MgV2O6 microrods, MgV2O6/MXene composite is prepared and, improved specific capacitance of 788 F g- 1 is 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- 1 at the power density of 800 W kg- 1. Moreover, to justify the feasibility of the device in electronic field, five green color lightemitting diodes (LEDs), digital thermometer/humidometer, digital timer and toy motor fan are operated by series connected two MgV2O6/MXene//AC devices.