Preparation of Graphene Quantum Dots and Their Application for Photoanodes of Dye-Sensitized Solar Cells
| Autor: | Yi-Jhen Lin, 林伊眞 |
|---|---|
| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 Graphene has been widely studied since it has been studied by good mechanical stress, high specific surface area, electron transport efficiency and biocompatibility. When we have made graphene in chemical or physical way When it is reduced in size, it will change its nature due to quantum confinement and marginal effects. When its energy level is regulated to the proper range, it may release fluorescence, which is regarded as Graphene Quantum Dots). In addition to the various advantages of graphene as described above, the graphene quantum dots of different sizes were prepared by the different reaction temperature at the reaction time, and the synthesized ferrite quantum dots were mixed with the titanium dioxide nanometer Tube applied to the dye-sensitized solar cell anode. In this study, we investigated the effect of graphene quantum dots with different particle sizes on the photoanitrogenation of dye-sensitized solar cells, and discussed the effect of dye-sensitized solar cells. In this paper, a simple, low - cost and high - yield graphene quantum dots were prepared. The grained graphene was prepared by modified Hummer 's method, the pH value was adjusted to alkaline, and the graphene quantum dots were prepared by hydrothermal method. According to the identification of XRD, SEM, TEM and AFM, the particle size of the graphene quantum dots is 1-3 nm and the number of layers is 1-2 layers. The graphene quantum dots of small particles are easy to enter into the matrix Titanium dioxide nanotubes, is conducive to the working electrode photoelectric conversion efficiency. In terms of components, the photodiode of dye-sensitized solar cells with different sizes of graphene quantum dots and arrayed titania nanotubes with no graphene quantum dots were compared. From the experimental results show that the use of graphene quantum dots to help improve the dye-sensitized solar cell photoelectric conversion efficiency,the best can be achieved 2.13 %. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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