| Summary: | 碩士 === 國立清華大學 === 工程與系統科學系 === 98 === In this study, we have synthesized gold-silver nanowires, and Ru-Pt core-shell nanoparticles material for applications in dye-sensitized solar cell. First, we used Polyol process to synthesis silver nanowires. The synthesized silver nanowires were used as templates to synthesize porus gold-silver nanostructured wires by reducing gold ions on the surface of silver nanowires. The synthesized gold-silver nanowires were studied by SEM, TEM, and XRD for structural characterization. Fractal-like silver nanomaterials were also synthesized using mixed surfactants of CTAB and SDS. In this study, DSSC anode was fabricated by mixing the commercial titanium dioxide nanoparticles (P25) with the synthesized metallic nanomaterial. It was found that the efficiency of the DSSC with the addition of gold-silver nanowires in the adode could increase from 4.1% to 4.8% for silver nanowires, 4.1% to 4.9% for the 25% replacement nanowires (silver replaced by gold), 4.1% to 4.5% for the 50% replacement nanowires, and 4.1% to 4.3% for 100% replacement nanowires. Although porus gold-silver nanowires have broader and higher absorption spectra at long wavelength, the porus gold-silver nanowires have grain-like structures with many crystal boundaries and defects. These drawbacks might reduce the efficiency of the electron transportation. The overall efficiency may be slightly higher by using the 25% replacement nanowires, and gets worse with 50% and 100% replacement nanowires.
Also, we have synthesized Ru-Pt core-shell catalysts (Rucore-Ptshell) to be used for the DSSC cathode. By using the Ru-Pt core-shell catalysts as the DSSC cathode could significantly enhance the efficiency as compared with the Pt nanoparticle cathode. By using Ru-Pt core-shell catalysts as the cathode, the DSSC efficiency can be increased from 4.3% to 5.7%. By cyclic voltammetry, we found that the Ru-Pt core-shell catalysts could significantly enhance I2/I3- catalysis that the Pt nanoparticles catalysts.
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