University of Twente Student Theses


Templated Activated Carbon for Electric Double Layer Capacitors

Vasileios, Papadimitriou (2015) Templated Activated Carbon for Electric Double Layer Capacitors.

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Abstract:In this thesis the field of Electric Double Layer Capacitors (EDLC) is investigated. Two main research questions are discussed. First, which are the properties for an ideal EDLC electrode in terms of energy (capacitance) and power density? The literature study revealed that both nanopores and meso-/macropores are required for an ideal electrode. Nanopores enhance the energy density due to desolvation effects, when the pore size is between solvated and bare electrolyte ion size. Meso-/macropores enhance the power density due to faster diffusion in them than in nanopores. In addition, the resistance between electrode and current collector also affects the power density. Second, can an electrode be fabricated in respect with the findings of the first question? By combining two techniques which are typically used in EDLC fabrication, namely templated carbon (TC) and activated carbon (AC), several electrodes were fabricated with a combination of nano-, meso- and macropores. An addition, a new type of current collector is proposed. The electrodes have been characterized electrochemically (via cyclic voltametry, electrochemical impedance spectroscopy and charge-discharge cycling) and physically (via scanning electron microscopy and Brunauer-Emmet-Teller method). The electrodes exhibit capacitance up to 217.63 F/g and power up to 25.83 kW/kg.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:33 physics, 35 chemistry, 43 environmental science, 51 materials science, 53 electrotechnology
Programme:Electrical Engineering MSc (60353)
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