Saka, CaferYardim, YavuzGenel, Ilyas2025-09-032025-09-0320251572-66571873-256910.1016/j.jelechem.2025.1194272-s2.0-105013543033https://doi.org/10.1016/j.jelechem.2025.119427In this work, a nitrogen-doped activated carbon (N-NaOH-ACP) was synthesized via ammonia treatment of sodium hydroxide-activated carbon derived from pomegranate peel, a renewable and low-cost biomass waste. Comprehensive characterization using SEM, FTIR, XPS, Raman spectroscopy, EDS, XRD, and nitrogen adsorption-desorption analyses revealed that N-NaOH-ACP possessed a hierarchical porous structure and a high specific surface area of 2085 m2/g. Nitrogen incorporation significantly enhanced the electrochemical performance, delivering a specific capacitance of 338 F/g at 0.4 A/g in a 1 M KCl electrolyte-nearly three times higher than the undoped material. Furthermore, the symmetric supercapacitor device fabricated using N-NaOH-ACP electrodes exhibited excellent cycling durability, retaining 91.9 % of its initial capacitance after prolonged charge-discharge cycles. These findings highlight the beneficial effects of nitrogen doping on capacitive properties and underscore the potential of N-NaOH-ACP as a sustainable and efficient electrode material for advanced energy storage systems.eninfo:eu-repo/semantics/closedAccessNitrogen-Doped Activated CarbonPomegranate PeelBiomass-Derived CarbonSupercapacitor ElectrodeElectrochemical Energy StorageArticle996Q1Q2WOS:001595235700001