| Summary: | 碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 104 === Carbon-based materials with large surface area, high conductivity, and porous structure are used as the electrode in vanadium redox flow battery (VRFB). According to these criteria, the graphite felt is suitable to be the electrode in VRFB. However, the graphite felt has a low energy efficiency problem due to its insufficient electrochemical activity and poor reversibility. In order to solve this problem, we focus on the electrode modification to increase the surface area and oxygen-containing functional groups on the surface of GF fibers, which is known to be electrochemically more active sites for vanadium redox reaction.
In the first part, we try to modify the morphology of carbon nanofibers by adding some electrochemical additives and using the electrospinning method, in which its radius, size, length, and texture of carbon nanofiber can be modified by the electrospinning process. In the second part, we plan to improve the energy storage efficiency of graphite felt by using activation process with CO2 gas. By controlling the process parameters, the correlation between the electrode, the morphology, the physical characteristics, the electrochemical behavior, and its application for vanadium redox flow battery can be established.
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