Lithium iodide effect on the electrochemical behavior of agarose based polymer electrolyte for dye-sensitized solar cell
Lithium iodide effect on the electrochemical behavior of agarose based polymer electrolyte for dye-sensitized solar cell
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DOI：
10.1016/j.electacta.2011.06.032
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发表时间：
2011-08
影响因子：
6.6
通讯作者：
Weijia Wang;Xueyi Guo;Ying Yang
中科院分区：
文献类型：
--
作者：
Weijia Wang;Xueyi Guo;Ying Yang
研究了碘化锂（LiI：0–85wt%）对染料敏化太阳能电池（DSSC）琼脂糖基聚合物电解质电化学行为的影响。采用傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）分别表征聚合物基质和盐之间的相互作用以及琼脂糖电解质的形态。通过交流阻抗谱研究，确定琼脂糖基聚合物电解质的导电行为与低 LiI 含量（0-25wt%）的“聚合物盐”行为和高 LiI 含量（25-85wt%）的“盐聚合物”行为相匹配。还通过采用 EIS 技术对 DSSC 中使用这些琼脂糖电解质发生的特征电化学过程进行了详细分析。阻抗谱表明，DSSC的电子寿命随着LiI浓度的增加而缩短，而电荷转移电阻和电荷复合电阻则随着LiI浓度的增加而降低。
The effect of lithium iodide (LiI: 0–85wt%) on the electrochemical behavior of agarose-based polymer electrolytes for dye-sensitized solar cells (DSSC) was investigated. Fourier Transform Infrared Spectroscopy (FTIR) and scanning electronic microscopy (SEM) were employed to characterize the interactions between polymer matrix and salt and the morphology of the agarose electrolytes, respectively. From the AC impedance spectra study, it was determined that the conduction behavior of the agarose-based polymer electrolyte matches the “salt-in-polymer” like behavior of low LiI content (0–25wt%) and “polymer-in-salt” like behavior of high LiI content (25–85wt%). Detailed analysis of characteristic electrochemical processes occurring in DSSC with these agarose electrolytes was also obtained by employing the EIS technique. The impedance spectra showed that the electron lifetime of DSSC was shortened with increasing LiI concentration, while the charge transfer resistance and charge recombination resistance were reduced when LiI concentration was increased.