| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 103 === Flake-type graphite was used for synthesizing graphene oxide (GO), which was then reduced to a few layers of graphene sheets by using a chemical reduction or thermal reduction method. The thermal reduction method can be divided reduction in the air or nitrogen. The surface morphology, phase crystallization, and defect states of the reduced graphene were determined using electron microscopy and X-ray diffraction and by using Raman and infrared spectra. A dye-sensitized solar cell with the synthesized graphene as the counter electrode was fabricated for evaluating the electrolyte activity and charge transport performance. Intercalated defects that are generally formed during the thermal reduction of GO (tGP) were eliminated by increasing the reduction temperature. Furthermore, the product of the chemical reduction of GO was also in the amorphous phase because substitutional Ti+ ions disrupted the graphene order. Electrochemical impedance spectra showed that increasing the thermal reduction temperature could yield tGP with a lower resistance, increase the electron lifetime, and result in an energy conversion efficiency of approximately 3.22%.Graphene reduction in nitrogen conversion efficiency of approximately 3.318%.
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