Effect of MXene on Co3O4-LaVO4 Nanocomposites for Synergistic Charge Transport Enhancement and High-Performance VARTM Assisted Solid-State Supercapacitor Device using Woven Carbon Fibre

Abstract

This study investigates the synthesis of LaVO4 (LaVO), Co3O4-LaVO4 (Co-LaVO), and Co3O4-LaVO4/MXene (Co-LaVO/Mx) nanocomposites, focusing on optimizing MXene concentration in Co-LaVO/Mx for high-performance supercapacitor electrodes. The optimal MXene concentration in Co-LaVO/Mx was identified and utilized to fabricate high-performance supercapacitor devices using the vacuum-assisted resin transfer molding (VARTM) technique. Among the tested compositions in the three-electrode system, the Co-LaVO-Mx3 nanocomposite exhibited the highest electrochemical performance, achieving an outstanding specific capacitance of 1287.80 F/g at a current density of 1 A/g. This remarkable enhancement significantly outperforms LaVO4 (575.67 F/g), Co-LaVO (610.66 F/g), Co-LaVO/Mx1 (783.56 F/g), and Co-LaVO/Mx5 (1196.45 F/g), demonstrating the crucial role of optimized MXene concentration in improving charge storage, conductivity, and overall electrochemical efficiency. The optimized Co-LaVO/Mx3 nanocomposite was integrated onto woven carbon fibers (WCF) and employed to fabricate high-performance solid-state supercapacitor devices using the VARTM technique. The resulting device demonstrated an impressive specific capacitance of 317.57 F/g at 2 A/g and achieved a remarkable energy density of 74.85 Wh/kg at 1000 W/kg. Furthermore, it exhibited exceptional cycling stability, retaining 81% of its initial capacitance after 50,000 cycles, highlighting its robustness and long-term operational reliability for advanced energy storage applications.