Rubens Nunes de Faria JuniorBARBOSA, INGRID A.B.2024-02-062024-02-062023BARBOSA, INGRID A.B. <b>Binder-free textile PAN-based electrodes for aqueous and glycerol-based electrochemical supercapacitors</b>. Orientador: Rubens Nunes de Faria Junior. 2023. 135 f. Dissertação (Mestrado em Tecnologia Nuclear) - Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP, São Paulo. DOI: <a href="https://dx.doi.org/10.11606/D.85.2023.tde-06102023-140822">10.11606/D.85.2023.tde-06102023-140822</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/34503.http://repositorio.ipen.br/handle/123456789/34503Amidst different types of energy storage devices, electrochemical supercapacitors have received considerable attention as they close the gap between electrolytic capacitors and batteries. This work addresses electric double-layer capacitors (EDLCs), a type of electrochemical supercapacitor, and has been divided into two parts. In the former, the production and characterization of activated carbon fiber-felt (ACFF) electrodes derived from textile PAN-based fiber have been provided. In the latter, the electrochemical characterization of EDLCs in aqueous electrolytes (acidic and alkaline) and in three types of glycerol-based electrolytes have been investigated. Binder-free ACFF electrodes have a high specific surface area of 1875 m2 g-1, containing 87% of the total volume of pores as micropores (maximum pore width of 3 nm), and a modal distribution of 1.2 nm. Electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge techniques were carried out in a symmetric two-electrode setup at room temperature. The results showed that ACFF electrodes are suitable for acidic and alkaline aqueous electrolytes as well as the choline chloride-glycerol hybrid electrolyte (ChCl:GLY) at a molar ratio of 3:1. Among aqueous electrolytes, H2SO4 2 mol L-1 had the most satisfactory electrochemical performance in terms of power and energy, followed by KOH 2 mol L-1 and H2SO4 1 mol L-1. Among the glycerol-based electrolytes investigated in this work, ChCl:GLY (3:1) has the most comparable performance to aqueous electrolytes. Although power density is still limited due to high internal resistance, ChCl:GLY (3:1) is heat-resistant and a promising alternative electrolyte for supercapacitors applications, especially given that glycerol is a by-product of FAME (fatty acid methyl ester) biodiesel.135openAccesscapacitive energy storage equipmentdoublet-2 deviceelectric conductorselectrochemical energy conversionimpedancespectroscopyvoltametrynitrilesglycerolfibersaqueous solutionsDissertação10.11606/D.85.2023.tde-06102023-140822