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Effective iron-molybdenum-disulfide counter electrodes for use in platinum-free dye-sensitized solar cells

高效铁钼硫对电极在无铂染料敏化太阳能电池中的应用

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Abstract

Nanocomposites of iron disulfide (FeS2) and molybdenum disulfide (MoS2) with nanosheets structure were successfully grown on the flexible titanium foils through a facile one-step hydrothermal process, and then worked as counter electrodes (CEs) in the dye-sensitized solar cells (DSSCs). X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectrometer were employed to characterize the microstructure and composition of the FeS2/MoS2. Cyclic voltammogram reveals that the catalytic activity of FeS2/MoS2 CE is higher than that of FeS2, MoS2, and platinum (Pt) CEs towards triiodide/iodide (I3/I) redox electrolyte, owing to the superior carrier transfer properties of vertical array structure and abundant catalytic active sites of FeS2/MoS2 nanosheets. Moreover, the FeS2/MoS2 CE maintains its activity after 500 cycles, exhibiting excellent electrochemical stability. Furthermore, the power conversion efficiency (PCE) of FeS2/MoS2 CE reaches 8.67%, which is higher than that of the FeS2 (7.20%), MoS2 (7.38%) and Pt (8.16%) CEs.

摘要

本文通过一步水热法成功地在钛片上生长FeS2和纳米片结构MoS2复合材料, 并且将其应用在染料敏化太阳能电池的对电极上. X-射线衍射, 扫描电子显微镜, 透射电子显微镜和能谱仪被用来表征FeS2/MoS2的微观结构和组成. 循环伏安测试结果表明FeS2/MoS2对电极对I3/I电解液的催化活性比FeS2, MoS2, Pt对电极高, 这可以归因于FeS2/MoS2对电极的垂直序列结构具有较好的电子传输性能和丰富的催化活性位点. 并且, FeS2/MoS2对电极在测试500个周期后能保持一定的活性, 表明其具有较好的稳定性. 此外, FeS2/MoS2对电极的光电转换效率达8.67%, 优于FeS2 (7.20%), MoS2 (7.38%)和Pt (8.16%)对电极.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (61504076, 21574076, and U1510121), National Natural Science Foundation of Shanxi Province (2015021129 and 2014011016-1), Fund of Fujian Key Laboratory of Photoelectric Functional Materials (FJPFM-201502), and Ministry of Science and Technology Taiwan (MOST 106-2923-E-036-002-MY3 and MOST 106-2221-E-036-018). And we are also grateful for the test platform provided by Shanxi University of Scientific Instrument Center.

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Correspondence to Yaoming Xiao  (肖尧明) or Jeng-Yu Lin  (林正裕).

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Lijun Su is currently pursuing her Master degree at the Institute of Molecular Science of Shanxi University. Her research is focused on the dye-sensitized solar cells.

Yaoming Xiao is currently a professor at the Institute of Molecular Science of Shanxi University. He received his PhD degree from the Institute of Materials Physical Chemistry at Huaqiao University in 2013. His current research includes dye-sensitized solar cells and perovskite solar cells.

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Su, L., Xiao, Y., Han, G. et al. Effective iron-molybdenum-disulfide counter electrodes for use in platinum-free dye-sensitized solar cells. Sci. China Mater. 61, 1278–1284 (2018). https://doi.org/10.1007/s40843-018-9260-8

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