Direct synthesis of platelet graphitic-nanofibers as a highly porous counter electrode in dye-sensitized solar cells
| Autor: | Hsieh, Chien-Kuo, 謝建國 |
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| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 Recently, the issues of the shortage of fossil fuels and global warming raised the attention of which looking for the clean and high efficiency energies. Green energy devices will be inevitable to maintain global health and economic. For this purpose, solar cells have been promising candidates for the energy requirement. In the first part of this thesis, we developed the directly synthesis of the graphitic nanofibres (GNFs) on FTO glass at low temperature via the low pressure chemical vapor deposition (LPCVD) method. We investigated the GNFs growth mechanisms as a function of oxygen flow and Ni particle size. We successfully grow the mesoporous-surface platelet-GNFs on FTO glass without conductivity degradation at low temperature. In the second part of this thesis, we investigated the photoconversion efficiency and the electrochemical properties of the dye-sensitized solar cells (DSSCs) by using various counter electrodes. Our direct grown GNFs forest on FTO glass provided a highly porous surface to enhance the electrochemical activity, and promoted the kinetics of charge transfer reactions to improve the photoconversion efficiency of DSSCs. The directly synthesis of graphitic-nanofibers (GNFs) shown the nearly equal performance compared with the Pt film. In the third part of this thesis, we deposited platinum nanoparticles (PtNPs) on the GNFs via electrochemical deposition technology. This three-dimensional (3D) PtNPs/GNFs/FTO hybrid nanostructure combined the advantages of Pt and GNFs, shown the superior JSC and better F.F., resulting in a high photo-conversion efficiency. The photoconversion efficiency of the PtNP/GNF 3D hybrid nanostructure was 17.8% higher than that of the traditional Pt film. Our results provide a new strategy that can be exploited for the fabrication of high performance DSSCs. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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