Investigation of carbon nanotubes decorated with cobalt sulfides of different phases as nanocomposite catalysts in dye-sensitized solar cells
Investigation of carbon nanotubes decorated with cobalt sulfides of different phases as nanocomposite catalysts in dye-sensitized solar cells
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DOI：
10.1016/j.electacta.2014.07.145
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发表时间：
2014-10
影响因子：
6.6
通讯作者：
Sheng-Yen Tai;Man-Ning Lu;H. Ho;Yaoming Xiao;Jeng-Yu Lin
中科院分区：
文献类型：
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作者：
Sheng-Yen Tai;Man-Ning Lu;H. Ho;Yaoming Xiao;Jeng-Yu Lin
在这项研究中，以CNT@CoS1. 097和CNT@Co9S8的形式的硫化钴和碳纳米管（CNT）的纳米复合物通过使用简易的喷涂方法沉积在氟掺杂的SnO 2（FTO）涂覆的玻璃上，然后分别在400和600 °C下在N2气氛下退火;并用作染料敏化太阳能电池（DSC）的对电极（CE）。通过循环伏安法、电化学阻抗谱和Tafel极化测试等电化学性能测试，CNT@Co9S8CE对三碘（I3单键）的还原具有上级的电催化活性.结果，基于CNT@Co9S8CE的DSC实现了令人印象深刻的7.78%的光伏转换效率，这甚至高于用CNT@CoS1.097CE（7.29%）和Pt CE（7.46%）组装的DSC的光伏转换效率。这表明CNT@Co9S8确实是一种高效且具有成本效益的类Pt替代CE，用于DSC中的I3单键还原反应。
In this study, nanocomposites of cobalt sulfide and carbon nanotube (CNT) in the forms of CNT@CoS1.097and CNT@Co9S8were deposited on fluorine-doped SnO2(FTO)-coated glasses by using a facile spray-coating approach, followed by annealing under N2atmosphere at 400 and 600 °C, respectively; and employed as counter electrodes (CEs) for dye-sensitized solar cells (DSCs). According to the electrochemical properties of CEs quantified by cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel polarization measurements, the CNT@Co9S8CE showed a superior electrocatalytic activity towards triiodide (I3single bond) reduction to that of the CNT@CoS1.097CE. As a result, the DSC based on the CNT@Co9S8CE achieved an impressive photovoltaic conversion efficiency of 7.78%, which was even higher than those of the DSCs assembled with the CNT@CoS1.097CE (7.29%) and Pt CE (7.46%). This signifies that the CNT@Co9S8was indeed an efficient and cost-effective Pt-like alternative CE for I3single bondreduction reaction in DSCs.