色素敏化染料
三碘化物
聚吡咯
辅助电极
材料科学
介电谱
循环伏安法
碳纳米管
氧化锡
化学工程
电化学
电极
电解质
纳米技术
聚合
复合材料
兴奋剂
化学
光电子学
物理化学
工程类
聚合物
作者
Gentian Yue,Lei Wang,Xinan Zhang,Jihuai Wu,Qiwei Jiang,Weifeng Zhang,Miaoliang Huang,Jianming Lin
出处
期刊:Energy
[Elsevier]
日期:2014-04-01
卷期号:67: 460-467
被引量:71
标识
DOI:10.1016/j.energy.2014.01.058
摘要
In our present study, the composite film of MWCNTs/Ppy (multi-walled carbon nanotubes and polypyrrole) was proposed as CE (counter electrode) catalyst in DSSCs (dye-sensitized solar cells) to speed up the reduction of triiodide to iodide. The MWCNTs/Ppy composite film was synthesized and fabricated it on rigid fluorine-doped tin oxide substrates by using a facile electrochemical polymerization route, and served as CE in DSSCs. The unique structural characteristics including rough surface consisted of the numerous MWCNTs coated on Ppy nanoparticles guaranteed fast mass transport for the electrolyte, and enabled the MWCNTs/Ppy CE to speed up the reduction of triiodide to iodide. The electrochemical analyses came from cyclic voltammetry and electrochemical impedance spectroscopy revealed that the MWCNTs/Ppy CE possessed more excellent electrocatalytic activity, electrochemical stability and lower charge transfer resistance of 2.82 Ω cm2 in comparison with a sputtered-Pt CE. The DSSC assembled with the novel MWCNTs/Ppy CE exhibited a high light-electric conversion efficiency of 7.42% under the illumination of 100 mW cm−2, comparable to that of the DSSC based on sputtered-Pt electrode (6.85%). Therefore, the MWCNTs/Ppy composite film can be considered as a promising alternative CE for DSSC due to its high electrocatalytic performance and excellent electrochemical stability.
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