Pseudo First-Order Adsorption Kinetics of N719 Dye on TiO2 Surface
Pseudo First-Order Adsorption Kinetics of N719 Dye on TiO2 Surface
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DOI：
10.1021/am2001696
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发表时间：
2011-06-01
影响因子：
9.5
通讯作者：
Park, Nam-Gyu
中科院分区：
文献类型：
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作者：
Lee, Chang-Ryul;Kim, Hui-Seon;Park, Nam-Gyu
我们已经研究了Ru基N719染料在染料敏化太阳能电池中使用0.5 mM和mM染料溶液在TiO 2表面上的吸附动力学。染料在Ca.测量5 μ m厚的膜作为浸渍（吸附）时间的函数。吸附量随吸附时间的增加而增加，饱和后保持不变。染料吸附的完成被发现是5倍以上的速度在5 mM比在0.5 mM。由于染料浓度的变化是可以忽略不计相比，TiO 2吸附位点的数量，反应级数和速率常数可以估计从一个假反应。在零阶、一阶和二阶模拟中，对于0.5 mM和5 mM的情况，观察到的数据遵循一阶反应。速率常数估计为0.504 min（-1）（5 mM）和0.094 min（-1）（0.5 mM），这表明染料吸附的完成在5 mM中比在0.5 mM中短约5倍。这与观察到的吸附时间差一致。除了吸附动力学的差异，最佳电池效率是相似的，而不管染料溶液浓度。
We have investigated the adsorption kinetics of Ru-based N719 dye on TiO2 surface in dye-sensitized solar cell using 0.5 mM and mM dye solutions. The amount of adsorbed dye on TiO2 surface of ca. 5 mu m-thick film was measured as a function of immersion (adsorption) time. The amount of adsorbed dye increases with increasing the adsorption time and keeps constant after saturation. Completion of dye adsorption is found to be more than 5 times faster in 5 mM than in 0.5 mM. Since the change of dye concentration is negligible compared to that of number of TiO2 adsorption site, reaction order and rate constant can be estimated from a pseudo reaction. Among the zeroth-, first-, and second-order simulation, the observed data follow first order reaction for both 0.5 mM and 5 mM cases. The rate constant is estimated to be 0.504 min(-1) for 5 mM and 0.094 min(-1) for 0.5 mM, which indicates that completion of dye adsorption is about 5 times shorter in 5 mM than in 0.5 mM. This is consistent with the observed adsorption time difference. Except for the difference in adsorption kinetics, best cell efficiency is similar regardless of dye solution concentration.