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Synthese and Characterization of TiO_ 2 /SrO Core-shell Nanowire Array and Using It in DSSC

Author: ZhuoYanJun
Tutor: ChiBo
School: Huazhong University of Science and Technology
Course: Materials Science
Keywords: DSSC TiO2 nano-wire hydrothermal reaction nano-array core-shell structure
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 50
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Abstract


Dye sensitized solar cell （DSSC） is a novel solar cell. It has been wildly investigated because of its low-cost, simple produce, materials abundant and environment friendly. Nowadays, using the one-dimensional nano-material with the property of linear electron conduction as the photoanode for DSSC attracts much attention, meanwhile, improving the conversation of cells by modify TiO2 film with large band gap metal oxides which can suppress electron recombination is a trend. So in this thesis, we studied how to prepare TiO2 nanowire array and TiO2 nanowire, and then we mix TiO2 nanowire with P25 to prepare the photoanode for DSSC and measure the performance of the cells, we also study the TiO2/SrO core-shell DSSC.（1） Study the reaction route of Ti foil with alkaline solution to understand how synthesis conditions affect the structure and provide a simple method for fabricating titanate nanostructure array on Ti foil, followed by heating to convert titanate to TiO2 without changing the morphology. The formation mechanism of these nanostructures was also discussed. Finally, we mix TiO2 nanowire with P25 to prepare the photoanode for DSSC and measure the performance of the cells. The results indicated that the hydrothermal parameters such as hydrothermal temperature and alkaline solution concentration had important effect on the morphology of the nanostructure array but reaction time had no obvious effect on the morphology of the nanostructure array.（2） Syntheses of TiO2/SrO core-shell nanowire array film by dipping TiO2 nanowire array into saturated Sr（NO3）2 aqueous solution, and study how the dipping time affect the thick of the shell and how the thick of the shell affect reflectance spectrum of TiO2/SrO nanowire array. The results indicated that the reflectance spectrum change hardly after coating with SrO but when the thickness of SrO very thin, but the thickness almost have no obvious influence on the reflectance spectrum since it is thick enough.（3） Syntheses of TiO2 nanowire through P25 react with alkaline aqueous solution. Then mix it with P25 to prepare photoanode for dye-sensitized solar cells（DSSC） and measure the performance. The results indicated that performance of the cell is improved only when the composition of TiO2 nanowire less. （4） Syntheses of TiO2/SrO core-shell nano-particle film by dipping TiO2 film into saturated Sr（NO3）2 aqueous solution, and study how their affect life of electron, dark-current and performance of the cell. The results indicated that increasing the thickness of the shell, the performance of the cell at first increased and then reduced, the rate of open-voltage reduction decreased, the rate of electron recombination reduced and the life of electron prolonged and TiO2/SrO core-shell can suppress the recombination reaction.

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