Πλοήγηση ανά Συγγραφέας "Apostolopoulou, Maria"

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    Exploring the growth mechanism of the electrodeposited carbon components as potential buffer layers for energy storage applications
    (ΕΛΜΕΠΑ, Σχολή Μηχανικών (ΣΜΗΧ), ΔΠΜΣ Νανοτεχνολογία για Ενεργειακές Εφαρμογές, 2024-07-09) Apostolopoulou, Maria; Αποστολοπούλου, Μαρία; Vernardou, Dimitra; Βερνάρδου, Δήμητρα
    In recent years, the depletion of fossil fuels and environmental pollution has prompted both industry and the scientific community to seek alternative energy sources. Lithium-ion batteries, due to their high energy density, small size, long lifetime and low pollution, have gained a dominant position in everyday life, finding application in portable devices (laptops, smart phones), power tools and electric vehicles. Due to this rapid development of technology, there is growing demand for more efficient energy storage devices. This dissertation aims to investigate carbon-based materials, especially graphene oxide as a potential buffer layer for electrodes in lithium-ion batteries (LIBs) and electrochemical capacitors (ECs). The unique properties of carbon-based materials, such as high surface area, excellent electrical conductivity and tunable pore structures, have led to their widespread application as alternative materials to traditional graphite. The material synthesis procedure was carried out using a graphene oxide dispersion solution, which was prepared by the modified Hummer method. The dispersed solution was the electrolyte in the electrodeposition technique for the immobilization of graphene oxide on copper substrate. The growth mechanism of the material was studied for different deposition time and current. Additionally, the impact of the electrolyte concentration (Li2SO4) and the amount of graphene oxide on the electrochemical behavior of the synthesized materials was investigated. Then, the stability of the optimum material obtained (i.e. highest current and material’s adhesion) was tested in 600 continuous charge/discharge cycles with sufficiently satisfactory results. In all samples, structural, morphological and electrochemical measurements were carried out by Raman spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV). In conclusion, the dissertation highlights the potential of graphene oxide synthesized via the electrodeposition technique as a cost-effective, rapid, and promising buffer layer for anode materials in energy storage devices.