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URN etd-0914115-131321 Statistics This thesis had been viewed 779 times. Download 0 times. Author An-Lin Su Author's Email Address No Public. Department Chemical Engineering Year 2014 Semester 2 Degree Master Type of Document Master's Thesis Language Chinese&English Page Count 84 Title Preparation of NiCo2S4 Counter Electrodein Dye-sensitized Solar Cells via a Facile Solution Approach Keyword NiCo2S4 Counter Electrode Dye-sensitized Solar Cells Dye-sensitized Solar Cells Counter Electrode NiCo2S4 Abstract In this study, NiCo2S4 (NCS) counter electrodes (CEs) were successfully fabricated via a facile dip-coating method for the first time. Prior to the CE preparation, the NCS particles were synthesized via a hydrothermal method. Afterward,the as-synthesized NCS were ball milled and dispersed in de-ionized water or ethanol solutions. The bare fluorine-doped tin oxide (FTO) glass substrates were dipped in the surface-conditioner solution for 1 min and subsequently dipped in the as-prepared NSC suspension solution for different times.TheInductively Coupled Plasma Mass Spectrometry(ICP-MS) results showed the mass loadings for both kinds of NCS CEs first increased with immersion time, and thenretain almost the same while the immersion time was over than 10 min The NCS CEs prepared by dipping in in de-ionized water and ethanolsolutions for 10 min are designated as NCS-W10 and NCS-E10 CEs, respectively.According to the electrochemical and photovoltaic measurements, NCS-W10 CEdemonstrated superiorelectrocatalytic activity to the E10-NCS CE. Moreover, NCS-W10 demonstrated the low charge-transfer resistance of 1.56Ω. As a result, the photovoltaic conversion efficiency ofthe DSSC based on the NCS-W10 CE was up to 8.934 %, significantly higher than that of the DSSC using the NCS-E10 CE (8.520%), which was even comparable to that assembled with the Pt CE (8.812%).
To reduce the particle size of NCS particles for improving their electrocatalytic activity,Polyvinylpyrrolidone(PVP) was added in the NCS precursor solution for hydrothermal method. Interesting, it can be observed that the particle size decreased with increasing the addition of PVP amount. Nevertheless, the mass loadings of the PVP-NCS CEs were found to remarkably decrease mwith increasing the PVP amount in the precursor solution. Therefore, the PVP- NCS CEs showed the poorerelectrocatalytic activity and lower photoelectric conversion efficiency compared to the NCS CEs synthesized in the absent of PVP.It was found that the particle size of the secondary particles increased after ball milling. Furthermore, the result based on the Fourier transform infrared spectroscopy (FTIR) showed that the main functional groups of PVP were found on the PVP-NCS particles surface.This suggests that the PVP still retained on PVP- NCS surface and affected the mass loading of PVP-NCS on the FTO substrate, and cause therelatively poorerelectrocatalytic activity than that of the NCS CE.
Advisor Committee Jeng-Yu Lin - advisor
Chien-Kuo Hsieh - co-chair
Huai-Yi Chen - co-chair
Files Date of Defense 2015-07-14 Date of Submission 2015-09-14