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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Quantification of the effect of 4-tert-butylpyridine addition to I-/I-3(-) redox electrolytes in dye-sensitized nanostructured TiO2 solar cells
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Quantification of the effect of 4-tert-butylpyridine addition to I-/I-3(-) redox electrolytes in dye-sensitized nanostructured TiO2 solar cells

机译：量化I- / I-3（-）氧化还原电解质中4-叔丁基吡啶在染料敏化纳米结构TiO2太阳能电池中的作用

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摘要

Addition of 4-tert-butylpyridine (4TBP) to redox electrolytes used in dye- sensitized TiO2 solar cells has a large effect on their performance. In an electrolyte containing 0.7 M LiI and 0.05 M I-2 in 3-methoxypropionitrile, addition of 0.5 M 4TBP gave an increase of the open-circuit potential of 260 mV. Using charge extraction and electron lifetime measurements, this increases could be attributed to a shift of the TiO2 band edge toward negative potentials (responsible for 60% of the voltage increase) and to an increase of the electron lifetime (40%). At a lower 4TBP concentration the shift of the band edge was similar, but the effect on the electron lifetime was less pronounced. The working mechanism of 4TBP can be summarized as follows: (1) 4TBP affects the surface charge of TiO2 by decreasing the amount of adsorbed protons and/or Li+ ions. ( 2) It decreases the recombination of electrons in TiO2 with triiodide in the electrolyte by preventing triiodide access to the TiO2 surface and/or by complexation with iodine in the electrolyte.
机译：向染料敏化TiO2太阳能电池中使用的氧化还原电解质中添加4-叔丁基吡啶（4TBP）对它们的性能有很大影响。在3-甲氧基丙腈中含有0.7 M LiI和0.05 M I-2的电解质中，添加0.5 M 4TBP可使开路电势增加260 mV。使用电荷提取和电子寿命测量，该增加可以归因于TiO2谱带边缘向负电位的移动（负责60％的电压增加）和电子寿命的增加（40％）。在较低的4TBP浓度下，能带边缘的移动相似，但是对电子寿命的影响不太明显。 4TBP的工作机理可以概括如下：（1）4TBP通过减少质子和/或Li +离子的吸附量而影响TiO2的表面电荷。 （2）通过防止三碘化物进入TiO 2表面和/或通过与电解质中的碘络合来减少电解质中的TiO 2中的电子与三碘化物的再结合。

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