【摘要】 利用紫外-可见吸收光谱对提取的叶绿素和4种天然染料（茶多酚、靛蓝、红花黄、栀子黄）以及叶绿素与4种染料的共敏化进行比较。通过电化学方法,研究单一染料和共敏化染料的氧化还原电位。结果表明,杨树叶子中叶绿素最佳的提取工艺条件为:提取料液比1∶50,提取温度60℃,提取时间3.5h。叶绿素与4种天然染料共敏化后不仅拓宽光谱吸收波长范围,而且染料激发态氧化电位与TiO₂导带能级相匹配。其中叶绿素与栀子黄染料共敏化后,光电化学性能最好。在太阳光模拟下,叶绿素与栀子黄对电池进行共敏化后光电转换效率提高到0.67%,是叶绿素染料单独敏化的2.91倍。更多还原

【Abstract】 The ultraviolet-visible（UV-Vis）absorption spectra of chlorophyll,tea polyphenols,indigo,saffron,crocin and their co-sensitized dyes are compared.The state levels of dyes are measured by the electrochemical method.The results show that the optimum extraction conditions of chlorophyll the solid-liquid ratio of 1∶50,extraction temperature of 60℃and extraction time of 3.5h.The co-sensitized dyes can broaden the range of spectral absorption.Furthermore,the excited state level of co-sensitized dyes matches the couduction band edge of TiO₂.The photoelectrochemical property of the co-sensitization of chlorophyll and crocin is the best.The dye-sensitized solar cells（DSSCs）were fabricated by using natural dyes as sensitizers.Using the co-sensitization of chlorophyll and crocin dyes as sensitizer can improve the photoelectric conversion efficiency to 0.67%,which is 2.91 times larger than that of the chlorophyll.更多还原