Publications OK SMART LAB

One-pot hydrothermal synthesis of vanadium oxide-decorated carbon nanotube hybrid composite electrodes for superior supercapacitor applications
Authors
R. S. Ingole, K. Kim, M. Kim, Y. T. Kim, S. L. Kadam, J. Y. Seok, and J. G. Ok
Journal
Advanced Materials Technologies
Vol. (No.), pp.
2025, e00045
Year
2025
We demonstrate the one-pot hydrothermal synthesis of vanadium oxide (V₂O₅)-multi-walled carbon nanotube (CNT) hybrid composites for advanced energy storage devices with higher efficiency and reliability. The as-obtained composite reveals a unique 3D hierarchical architecture consisting of nanolayered V₂O₅ structures intricately entangled with a conductive CNT network. This configuration with complementary materials enhances the kinetics of charge transfer and ion diffusion rates, leading to superior electrochemical performance. The V₂O₅-CNT hybrid composite electrodes exhibit enhanced specific capacity of 2253.52 C/g (corresponding to specific capacitance of 2816.90 F/g), attributed to the combined contributions of diffusion-controlled processes and surface redox reactions. Furthermore, the electrode also demonstrates excellent cycling stability, retaining 87.74% of its initial capacity after 5000 cycles in a 6 M KOH electrolyte. The symmetric supercapacitor device fabricated by using optimized electrodes demonstrates excellent performance within a wide 1.2 V potential window, achieving an energy density of 22.02 Wh/kg, a power density of 841.67 W/kg, with 93.03% capacity retention over 5000 cycles. These findings highlight the synergistic advantages of the V₂O₅-CNT hybrid, encouraging it as a promising material for superior supercapacitor applications in the pursuit of clean and sustainable energy solutions.