Πλοήγηση ανά Συγγραφέας "Tsikritsaki, Eleftheria"

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    Evaluation of electrode materials derived from walnut biomass and their performance in sodium-Ion electrolyte systems for sustainable energy storage
    (ΕΛΜΕΠΑ, Σχολή Μηχανικών (ΣΜΗΧ), ΔΠΜΣ Νανοτεχνολογία για Ενεργειακές Εφαρμογές, 2026-06-07) Tsikritsaki, Eleftheria; Τσικριτσάκη, Ελευθερία; Vernardou, Dimitra; Βερνάρδου, Δήμητρα
    The growing demand for sustainable energy-storage technologies has intensified research efforts toward environmentally benign electrode materials and low-cost electrochemical systems. Among emerging solutions, biomass-derived carbons have attracted increasing attention due to their renewability, scalability, and reduced environmental footprint. In this context, the present thesis investigates walnut-shell-derived biochar as a sustainable carbon electrode material for aqueous sodium-based supercapacitor systems, with particular emphasis on the role of electrolyte chemistry in governing electrochemical performance. Walnut shells were converted into carbon electrodes through a simple activation-free pyrolysis process at 800 °C, followed by pellet fabrication using a PTFE binder. The electrochemical behavior of the produced biochar was systematically evaluated using both three-electrode and symmetric two-electrode configurations in four aqueous sodium electrolytes (Na₂SO₄, NaNO₃, NaCl, and NaOH). Cyclic voltammetry and galvanostatic charge–discharge techniques were employed to investigate charge-storage mechanisms, ion transport kinetics, and device-level performance.