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Natural Dye Sensitizer for Gr?tzel Cells: Sepia Melanin

机译：Gr？tzel细胞的天然染料敏化剂：棕褐色黑色素

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The efficiency of Gr?tzel cell can be further improved by the anchoring groups, such as COOH to be adsorbed onto the TiO2 surface with a large electronic coupling. Some of the most efficient sensitizers are synthetic dyes including transition metal coordination compounds such as Ruthenium polypyridyl complexes because of their highly efficient metal-to-ligand charge transfer, suitable ground and excited state energy levels with respect to titanium dioxide conduction band energy. They also have intense and wide range absorption in whole visible range. Even if they present such attractive features, their synthesis process is costly and complicated and they are not environment friendly because they contain heavy rare metals which are undesirable from the point of view of environmental conservation aspects. Natural dye can be the best alternative as they have acceptable efficiency in comparison to that one of transition coordination compounds and their extraction can be done by simple procedures from flowers, leaves, fruits, animals and other natural products. Melanin as the major component Sepia Officinalis ink pigment cause strong interactions with the hydroxyl groups of a TiO2. Melanin possesses a broad band absorbance in UV and visible range up to infrared. It also possesses the COOH and OH groups which would be free to bind to the surface of TiO2. Moreover, melanin polymer has interesting properties such as a considerable spectral absorbance width due to the high degree of conjugation of the molecule. This paper reports results from X-ray diffraction (XRD), UV-Vis as well as Raman spectroscopy of sepia melanin for Gr?tzel cell application.
机译：通过诸如COOH之类的锚定基团可以通过较大的电子耦合吸附到TiO2表面上，从而进一步提高了Grttzel电池的效率。一些最有效的敏化剂是合成染料，包括过渡金属配位化合物，例如钌聚吡啶基配合物，因为它们高效的金属到配体的电荷转移，相对于二氧化钛导带能的合适基态和激发态能级。它们还具有在整个可见光范围内的强烈和宽范围的吸收能力。即使它们表现出这种吸引人的特征，它们的合成过程也是昂贵且复杂的，并且它们不是环境友好的，因为它们包含重稀土金属，从环境保护方面的观点来看，这是不希望的。天然染料可能是最好的选择，因为与过渡配位化合物之一相比，它们具有可接受的效率，并且可以通过简单的方法从花，叶，水果，动物和其他天然产品中提取染料。黑色素是棕褐色墨水颜料的主要成分，可引起与TiO2羟基的强烈相互作用。黑色素在紫外线和可见光范围内（直至红外）均具有宽带吸收。它还具有可自由结合到TiO2表面的COOH和OH基团。而且，黑色素聚合物由于分子的高共轭度而具有令人感兴趣的性质，例如相当大的光谱吸收宽度。本文报道了棕褐色黑色素用于格氏细胞的X射线衍射（XRD），UV-Vis以及拉曼光谱的结果。

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