| Summary: | 碩士 === 明志科技大學 === 材料工程系碩士班 === 107 === Graphene oxide (GO) and polysulfone (PSF) based nanohybrid membranes (PSF /GO) are developed to serve as porous membranes in vanadium redox flow battery (VRFB). Various ratios of PSF/GO and thickness were investigated to evaluate the optimal voltage efficiency (VE), coulombic efficiency (CE), and energy efficiency (EE) of VRFB. The pore size, distribution and the hydrophilicity of PSF/GO membranes are studied by scanning electron microscope (SEM) images and contact angle test, respectively. Functional groups of GO are evaluated by Raman spectroscopy. The difference of PSF/GO membranes in the glass transition temperature (Tg) and decomposition temperature (Td) were analysed by thermo gravimetric analysis (TGA). The results of tensile tester show that the mechanical properties of the PSF porous membrane with GO nanosheets were significantly improved, indicated that the addition of graphene oxide nanosheets consolidated the internal structure. From the cyclic voltammetry, it displays obvious difference curve after the addition of GO nanosheets. The result shows that EE of VRFB in PSF/GO membrane is higher than that in pristine PSF membrane. Moreover, PSF/GO membranes display great chemical stability during long-term of operation and thus evolve as potential porous membranes for application in VRFB.
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