Electrochemical characterization of a novel iodine-free electrolyte for dye-sensitized solar cell

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• 作者：Congcong Wu^a ; Yingpeng Gong^a ; Song Han^b ; Tetsuro Jin^c ; Bo Chi^a ; ^{chibo@hust.edu.cn} ; Jian Pu^a ; Li Jian^a
• 关键词：Iodine-free electrolyte ; Recombination ; Ionic diffusion ; Dye-sensitized solar cell
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 June, 2012
• 卷：71
• 期：Complete
• 页码：33-38
• 文件大小：869 K

摘要

The triiodide ions in the triiodide/iodide redox electrolyte have the disadvantages of corrosion and spectrum absorption, which limits the further application of dye sensitized solar cell (DSSC). In this paper, an iodine-free electrolyte without the addition of iodine into iodide-based electrolyte was developed and the electrochemical performance of this novel electrolyte was evaluated by investigating the influence of iodine concentration on the performance of the electrolytes through UV-vis absorbance spectroscopy, Raman spectrum, current-voltage performance (I-V curve) and electrochemical impedance spectroscopy (EIS) methods. The results indicate that the iodine-free electrolyte could serve as an efficient mediator for DSSC operation. Owing to the absent of the triiodides generated by iodine, the iodine-free electrolyte has low charge recombination and fast electron transport characteristics, leading to relative high open circuit voltage (V_oc). However, acceptable short circuit current (J_sc) was obtained due to the mass transport limitation for iodine-free electrolyte. The results indicate that the iodine-free electrolyte has a potential high performance for DSSC.