Naskar, SouvikSouvikNaskarNaskar, IshitaIshitaNaskarGupta, Karan KumarKaran KumarGuptaCHUNG-HSIN LU2026-01-152026-01-152026-03-0100201693https://www.scopus.com/record/display.uri?eid=2-s2.0-105025028300&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/735359A simple hydrothermal and calcination procedure was used to synthesize 2D‑vanadium-doped MoSe₂ nanosheets (V-MoSe₂ NSs) with good control over shape and crystallinity in this study. Se removal from the V-Mo structure was assessed by p-XRD, FE-SEM, EDAX, and FE-TEM. The findings demonstrate that the crystal phase and textural characteristics alter as a result of physical parameter adjustment. The V-MoSe₂ in the two-electrode system was found to have a specific capacitance of 369 F g−1, which is higher than that of the pristine MoSe₂ (P-MoSe₂) electrode. The assembled lithium-ion supercapacitor (LISC) also exhibits impressive electrochemical performance, possessing an energy density of 479 Wh kg−1 and a power density of 8.7 kW kg−1, with good cycling stability and 88 % capacitance retention after 5000 cycles. The novelty of this work lies in the rational incorporation of vanadium into the MoSe₂ lattice to engineer its electronic structure and surface properties, which effectively enhances charge storage capability and ion diffusion kinetics. The increase in the electrochemical performance of V-MoSe₂ was due to its distinctive nanosheet-like morphology, which features a high specific surface area, low charge transfer resistance, and reduced ion diffusion resistance. This study displays a practical scheme for a combination of electrodes made of the metallic element vanadium and selenide.false2D MoSe2Energy densityLi-ion supercapacitorVanadium doped MoSe2[SDGs]SDG7journal article10.1016/j.ica.2025.1230382-s2.0-105025028300