Strategic intercalation of AB2O4 perovskite oxides for synergistic enhanced redox activity in sulphonated Ti3C2Tx MXene for energy storage applications

Abstract

Flexible supercapacitors are emerging as efficient, fast storage devices for new generation electronics. Two-dimensional (2D) transition metal carbides (MXene) have garnered attention as supercapacitor electrodes owing to their conductive layered sheets and the tunability of surface functional groups. In the present work, the Ti C3 2Tx MXene surface was sulphonated using dimethyl sulfoxide (DMSO) and intercalated with AB2O4(A= Co and Ni, B= Fe) perovskite nanoparticle (NPs). The sulphonated MXene (TMS) was processed using a sonication method in DMSO solventelectrolyte (0.1M H2SO4) interaction. to enhance the surface area and redox active sites forThe redox dominated enhanced specific capacitance was observed in 3 wt% CoFe2O4 (CFO) interacted TMS (3CTMS) and 3 wt% NiFe2O4 (NFO) interacted TMS (3NTMS), confirmed by Electrochemical Impedance Spectroscopy (EIS) and the Dunn’s method analysis. The specific capacitance of 3CTMS was found to be 593.81 F/g at 5 mV/sec, with an excellent cyclic stability of 81.75% after 10,000 cycles. A flexible symmetric supercapacitor fabricated with 3CTMS showed energy and power density of 4.177 Wh/kg and 512.17 W/kg, respectively. The flexible supercapacitor has been utilized in real time applications by charging and discharge to power 5 Light-Emitting Diodes (LEDs) with different forward voltages.