Application of SO4- and I- co-Doped Polyaniline Counter Electrode in Dye-sensitized Solar Cells

doi:10.6023/A15040264

Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (10): 1061-1068.DOI: 10.6023/A15040264 Previous Articles Next Articles

Article

SO₄^-和I^-共掺杂的聚苯胺对电极在染料敏化太阳电池中的应用

韩若冰^a,b, 芦姗^a, 王艳杰^a, 张雪华^a, 吴强^b, 贺涛^a

a 中国科学院纳米系统与多级次制造重点实验室国家纳米科学中心北京 100190;
b 上海电力学院环境与化学工程学院上海 200090

投稿日期:2015-04-16 发布日期:2015-07-07
通讯作者: 吴强, 贺涛 E-mail: het@nanoctr.cn; zhangxh@nanoctr.cn; qiangwu@shiep.edu.cn
基金资助:
项目受国家自然科学基金(Nos.21203039,21107069)和科技部国际合作(No.2015DFG62610)资助.

Application of SO₄^- and I^- co-Doped Polyaniline Counter Electrode in Dye-sensitized Solar Cells

Han Ruobing^a,b, Lu Shan^a, Wang Yanjie^a, Zhang Xuehua^a, Wu Qiang^b, He Tao^a

a CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190;
b Shanghai University of Electric Power, Shanghai 200090

Received:2015-04-16 Published:2015-07-07
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21203039, 21107069), and the Ministry of Science and Technology of China (No. 2015DFG62610).

1. Application of SO₄^- and I^- co-Doped Polyaniline Counter Electrode in Dye-sensitized Solar Cells.PDF(398KB)

Abstract

SO₄^- and I^- co-doped polyaniline (PANI) on fluorine-doped tin oxide (FTO) conductive glass substrates were fabricated via electropolymerization with different LiI concentration and used as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). The polymerization was performed via cyclic voltammetry (CV) method (0～1.0 V, vs saturated calomel electrode, SCE) at room temperature in aqueous solution, containing 0.35 mol·L^-1 aniline monomer, 0.25 mol·L^-1 H₂SO₄ and different concentrations of LiI (0, 0.01, 0.02 and 0.03 mol·L^-1). A Pt plate was used as the counter electrode and SCE was used as the reference electrode. The influences of I^- doping and the concentration of LiI on surface morphology, structure, and electrocatalytic activity for I^-/redox reaction of the obtained PANI CEs were thoroughly studied by scanning electron microscopy (SEM), UV-Vis absorption spectroscopy, fourier transform infrared spectroscopy (FT-IR), CV, and electrochemical impedance spectroscopy (EIS). SEM images indicated that the introduction of LiI into the polymerization solution could change the morphology of the obtained PANI CEs, which could provide more electrocatalytic sites for I^-/redox reaction. Meanwhile, the porosity of the as-prepared PANI films was also improved. It is worth noted that I^- co-doping could make it easier for 3I^-↔ +2e^- reaction on PANI electrodes. The sandwich-type DSSCs were comprised of a N719-sensitized TiO₂ working electrode, an as-prepared PANI or Pt electrode as CE, and a redox mediator solution containing 0.1 mol·L^-1 LiI, 0.05 mol·L^-1 I₂, 0.6 mol·L^-1 1,2-dimethyl-3-propylimidazolium iodide, and 0.5 mol·L^-1 4-tert-butylpyridine in acetonitrile. DSSC based on the PANI CE polymerized with 20 mmol·L^-1 LiI showed the best photovoltaic performance, with a solar-to-energy conversion efficiency of 6.52%, which is 93.8% of the efficiency of Pt-DSSC (6.95%) and 116% of that based on PANI CE doped only with SO₄^-. The results suggest that SO₄^- and I^- co-doped PANI CEs can improve the photovoltaic performance of the resultant DSSCs, and may replace Pt CEs in DSSCs in the future.

Key words: polyaniline, co-doping, electrocatalytic activity, counter electrode, dye-sensitized solar cells

Cite this article

Han Ruobing, Lu Shan, Wang Yanjie, Zhang Xuehua, Wu Qiang, He Tao. Application of SO₄^- and I^- co-Doped Polyaniline Counter Electrode in Dye-sensitized Solar Cells[J]. Acta Chim. Sinica, 2015, 73(10): 1061-1068.

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SO₄^-和I^-共掺杂的聚苯胺对电极在染料敏化太阳电池中的应用

Application of SO₄^- and I^- co-Doped Polyaniline Counter Electrode in Dye-sensitized Solar Cells

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SO4-和I-共掺杂的聚苯胺对电极在染料敏化太阳电池中的应用