| Summary: | 碩士 === 國立聯合大學 === 化學工程學系碩士班 === 103 === This study aim is to develop the electrodes that can be used in the semi-vanadium / iodine redox flow battery (Semi-VIRFB) system and design the Semi-VIRFB stacks to compare with the all-vanadium redox flow battery (All-VRFB) system. The composited electrodes, carbon paper/TiO2/Pd, were modified by the electroless plating method and sol-gel process, and expect that obtain a good electrochemical activity. The basic characteristics of the composited electrodes, such as the surface structural morphology, the metal crystal phases and electrochemical properties, were verified by the cyclic-voltammetry, FE-SEM, EDS, and XRD. This study shows modified electrodes can improve the electrochemical activity of the non-vanadium electrolyte between and the electrodes of the Semi-VIRFB system, and effectively raise its storage ability. The energy efficiency of the semi-VIRFB system is close to 83%, which is higher than the All-VRFB. In addition, Semi-VIRFB stacks were designed through the methods of series or parallel combination that could effectively render the operating voltage and the power capacity increasing linearly. The overall energy efficiency can still be maintained at around 70%. The semi-VIRFB system can reduce the amount of vanadium salt, therefore, it is not only a reduction in cost, but also has a great potential for the development of energy storage systems.
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