Alkali Iodide Deep Eutectic Solvents as Alternative Electrolytes for Dye Sensitized Solar Cells

Hugo Cruz, A. L. Pinto, N. Jordão, L. Neves, L. Branco
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引用次数: 7

Abstract

Different alkali deep eutectic solvents (DES), such as LiI:nEG, NaI:nEG, and KI:nEG, have been tested as electrolytes for dye sensitized solar cells (DSSCs). These DSSCs were prepared using pure DES or, alternatively, DES combined with different amounts of iodine (I2). The most important parameters, such as open circuit voltage (VOC), short circuit current density (JSC), fill factor (FF), and the overall conversion efficiency (η), were evaluated. Some DES seem to be promising candidates for DSSC applications, since they present higher VOC (up to 140 mV), similar FF values but less current density values, when compared with a reference electrolyte in the same experimental conditions. Additionally, electrochemical impedance spectroscopy (EIS) has been performed to elucidate the charge transfer and transport processes that occur in DSSCs. The values of different resistance (Ω·cm2) phenomena and recombination/relaxation time (s) for each process have been calculated. The best-performance was obtained for DES-based electrolyte, KI:EG (containing 0.5 mol% I2) showing an efficiency of 2.3%. The efficiency of this DES-based electrolyte is comparable to other literature systems, but the device stability is higher (only after seven months the performance of the device drop to 60%).
碘化碱深共晶溶剂作为染料敏化太阳能电池的替代电解质
不同的碱深共晶溶剂(DES),如LiI:nEG, NaI:nEG和KI:nEG,已被测试作为染料敏化太阳能电池(DSSCs)的电解质。这些DSSCs是用纯DES或DES与不同量的碘(I2)结合制备的。对开路电压(VOC)、短路电流密度(JSC)、填充系数(FF)和总转换效率(η)等重要参数进行了评价。一些DES似乎是DSSC应用的有希望的候选者,因为在相同的实验条件下,与参考电解质相比,它们具有更高的VOC(高达140 mV),相似的FF值,但电流密度值更小。此外,电化学阻抗谱(EIS)已被用于阐明发生在DSSCs中的电荷转移和输运过程。计算了每个过程的不同电阻(Ω·cm2)现象值和复合/弛豫时间(s)。以KI:EG(含0.5 mol% I2)为基料的电解液效率最高,为2.3%。这种基于des的电解质的效率与其他文献系统相当,但器件稳定性更高(仅在7个月后器件性能下降到60%)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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