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2757 |
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Thursday, September 29, 2011, Saal A 11:40 AM Young Professionals |
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Synthesis of porous super capacitor electrodes using the SPPS deposition technique |
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Mehdi Golozar* / University of Toronto,
Department of Materials Science and Engineering, Canada Ken Chien / University of Toronto, Canada Keryn Lian/ University of Toronto, Canada Thomas Coyle/ University of Toronto, Canada |
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Electrical double-layer capacitors (EDLCs) owe their large capacitance to the high specific surface area carbon-based electrode materials adhered to a current collector via an adhesive. However, recent studies attribute greater electrical energy storage capacity to transition metal oxides/nitrides: a new generation of electrode materials for use in electrochemical double layer capacitors (super-capacitors) with mixed double-layer and pseudo-capacitive properties. Solution Precursor Plasma Spray (SPPS) deposition is a technique that allows super-capacitor electrodes to be fabricated with fine grain sizes, high porosity levels, and high surface area; characteristics ideal for application as super-capacitor electrodes. SPPS has been employed to synthesize electrode materials from transition metal oxides/nitrides with the desired pore size and a uniform pore distribution. A versatile liquid injection apparatus was designed, assembled and customized based on the rheological properties of the solution to achieve optimal liquid injection into the DC-arc plasma and investigate the effects of various operating parameters such as spray distance, solution concentration and solution flow rate on the chemistry and surface topography of the deposits. Understanding and controlling the evolution of the precursor solution droplets in the DC-arc plasma jet is crucial in producing coatings of the desired structures. SEM-EDX, XRD structure analysis, image analysis and Cyclic Voltammetry analysis performed to characterize the coatings will be discussed, and the suitability of the deposits for use in super-capacitors will be assessed. |