High-performance supercapacitors anodes based on porous carbon@vanadium nitride composite modified by gold nanoparticles

Both porous carbon and vanadium nitride have been considered promising anode materials for supercapacitors that provide outstanding electrochemical performances. Here, porous carbon and vanadium nitride composites is fabricated and modified by gold nanoparticles using in-situ reduction method followed by hydrothermal reaction and heat-treatment. The characteristics of obtained composite material were determined through the utilization of advanced analytical techniques, including SEM, TEM, XPS, and XRD. These investigations have unambiguously verified the presence of gold nanoparticles and vanadium nitride on the surface of active carbon. The electrochemical investigations proved that the synthesized anode material possesses an impressive specific capacitance of 458.0 F/g at current density of 1.0 A/g. Furthermore, upon assembling the asymmetric device, an impressive E (18.9 Wh/kg) was achieved at P (180.0 W/kg). Even after subjecting the device to 10,000 cycles, a notable retention of 87.7% in specific capacitance was determined at a current density of 2.0 A/g.