Muhiuddin, M.Bharadishettar, N.Devi, N.A.Gautam, A.Chauhan, S.S.Siddique, A.B.Ahmad, M.I.Satyanarayan, M.N.K, U.B.Akhtar, W.Rahman, M.R.2026-02-032025Journal of Alloys and Compounds, 2025, 1012, , pp. -9258388https://doi.org/10.1016/j.jallcom.2025.178516https://idr.nitk.ac.in/handle/123456789/20463The publication presents a streamlined and economical technique for fabricating advanced electrode materials to enhance the energy storage capabilities of supercapacitors (SCs). The focus is on synthesizing neodymium-doped graphene quantum dots (Nd-GQDs) via a microwave-assisted hydrothermal (MAH) process. This method uses microwave irradiation's rapid heating and efficient energy transfer under low pressure and minimal reaction time. The resulting Nd-GQDs exhibit enhanced electrochemical properties, including increased capacitance and improved charge storage, making this approach practical and effective for advancing supercapacitor technology. An exceptional specific capacitance of 618 F g?1 at a 5 mV s?1 scan rate is demonstrated using Nd-GQDs as the SC electrode material. Due to their high specific capacitance, Nd-GQDs, when combined with polyaniline (PANI), improve the energy and power density of SCs. Nd-GQDs/PANI composites with varying amounts of Nd-GQDs in symmetric SCs are fabricated to demonstrate their promising properties for SC applications. SCs fabricated with 20 mL of Nd-GQDs in the PANI matrix showed a superior specific capacitance of 354 F g?1 at a current density of 1 A g?1, while the energy density and power density were 49.15 Wh kg?1 and 2000 W kg?1, respectively. © 2025 Elsevier B.V.Capacitor storageNanocrystalsElectrode materialEnergy densityGraphenesNeodymium dopedPolyaniline compositesPower densitiesPropertySupercapacitor applicationSymmetric supercapacitorSymmetricsGraphene quantum dots