两种天然染料共敏化光电化学性能研究

Study on photoelectrochemical property of two natural dyes with co-sensitization

从高原型朱砂垒牡丹和胡萝卜中提取牡丹花染料和类胡萝卜素染料,对提取、提纯的染料进行高效液相色谱分析,牡丹花和类胡萝卜素染料的纯度均达到90%以上。染料利用紫外-可见吸收光谱进行稳定性测试,发现染料稳定性良好,可作为染料敏化太阳能电池中的敏化剂。通过电化学方法对单一染料和共敏化染料进行分析。结果表明:共敏化染料不仅拓宽了光谱吸收范围,而且激发态氧化电位与TiO_2导带能级相匹配。当共敏化比例为1∶1时,共敏染料具有更佳的激发态和基态氧化电位,对其稀释3倍和调节pH=3,光电转换效率提高到0.935%和1.130%,是共敏化比例为1∶1时的1.13和1.37倍。

The dye were extracted from the Tibetan plateau Zhusha lei peony and carrot,which were analysed used the high performance liquid chormatography（HPLC）.The purity of peony and cartoenoid dye were up to 90%.Studied on stability by UV-Vis.The results showed that dye extracted from peony and carrot had high purity and good stability,which could be used as dye sensitizer.The co-sensitized dye were measured by the electrochemical method.The results showed that the co-sensitized dye broaden the spectral absorption range,also,the excited state level of dye matched the couduction band edge of TiO_2 nanoparcryticles.While the volume ratio of co-sensitization was 1∶1,the co-sensitized dye had better the excited state level and the ground state level.While the dilution ratio was three,the photoelectric conversion efficiency was0.935%,which was 1.13 times of the co-sensitized dye.While adjusted pH=3,the photoelectric conversion efficiency was1.130%,which was 1.37 times of it.