The adsorption of 4-tert-butylpyridine on the nanocrystalline TiO₂ and Raman spectra of dye-sensitized solar cells in situ

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• 作者：Chengwu Shi ; Songyuan Dai ; Kongjia Wang ; Xu Pan ; Fantai Kong and Linhua Hu
• 关键词：4-tert-Butylpyridine ; Nanocrystalline TiO₂ ; Adsorption ; Raman spectra ; Electrolyte ; Dye-sensitized solar cell
• 刊名：Vibrational Spectroscopy
• 出版年：2005
• 期刊代码：113_09242031
• 类别：ms
• 出版时间：2005
• 卷：39
• 期：1
• 页码：99-105
• 文件大小：500 K

摘要

In this article, we studied the adsorption of 4-tert-butylpyridine (TBP) on the nanocrystalline TiO₂ (anatase) powder by Raman, IR and XPS. In Raman spectra, the free TBP and physisorbed TBP showed the totally symmetric ring breathing mode at 996 cm⁻¹ and the vibration of the trigonal symmetry ring stretching mode was too weak to identify, while the coordinated TBP produced the characteristic trigonal symmetry ring stretching mode at 1022 cm⁻¹ and the vibration of the totally symmetric ring breathing mode shifted from 996 to 1007 cm⁻¹. From Raman spectra of dye-sensitized solar cells in situ, the Raman line at 167–169 cm⁻¹ should be assigned to the formation of TBP·I₂ or iodine adsorbed on the dye. Since there were significant differences from 100 to 300 cm⁻¹, we suggested that TBP, besides the adsorption on TiO₂, can also remove iodine adsorbed on the dye to suppress the rate of interfacial electron transfer from the conduction band of TiO₂ to iodine.