Mesoporous Electrodeposited-CoS Film as a Counter Electrode Catalyst in Dye-Sensitized Solar
Mesoporous Electrodeposited-CoS Film as a Counter Electrode Catalyst in Dye-Sensitized Solar
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DOI：
10.1149/2.036202jes
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发表时间：
2012-01-01
影响因子：
3.9
通讯作者：
Liao, Jen-Hung
中科院分区：
文献类型：
--
作者：
Lin, Jeng-Yu;Liao, Jen-Hung
在这项研究中，在硫脲（TU）的存在下，使用动电位沉积法在氟掺杂的氧化锡玻璃基底上沉积介孔CoS薄膜，形成染料敏化太阳能电池（DSSC）的对电极（CE）。首次研究了动电位沉积法在制备介孔CoS CE中的作用。结果表明，反向扫描（0.2 ~-1.2 V vs. Ag/AgCl）有利于形成对I-/I-3（-）氧化还原具有良好电催化活性的CoS，正向扫描（-1.2 ~0.2 V vs. Ag/AgCl）有利于形成形貌粗糙的存款，增加其活性表面积。同时发现TU的存在对沉积速率有促进作用，因此TU的浓度确实会影响CoS存款层的表面形貌和电催化性能。在优化TU浓度后，与具有经修饰的Pt CE的DSSC（5.80%）相比，在0.75 M TU中制备的具有CoS CE的DSSC显示出6.22%的上级电池效率。这种提高的效率归因于增加的活性表面积和较低的电荷转移电阻的I-3（-）还原。(C)2011年电化学学会。[DOI：10.1149/2.036202jes]版权所有。
In this study, a mesoporous CoS film was deposited onto a fluorine-doped tin oxide glass substrate to form a counter electrode (CE) in dye-sensitized solar cell (DSSC) using a potentiodynamic deposition in the presence of thiourea (TU). The function of potentiodynamic deposition used to prepare the mesoporous CoS CE was firstly investigated. It can be found that the reverse sweep (0.2 V to -1.2 V vs. Ag/AgCl) can facilitate the formation of CoS with excellent electrocatalytic activity for I-/I-3(-) redox reaction, and the forward sweep (-1.2 V to 0.2 V vs. Ag/AgCl) can profit the deposit with crude morphology to increase its active surface area. Moreover, TU was found to act as an accelerator to enhance the deposition rate, thus the concentration of TU did result in the change in the surface morphology and electrocatalytic behaviors of CoS deposit. After the optimization of TU concentration, a DSSC assembled with a CoS CE prepared in 0.75 M TU showed a superior cell efficiency of 6.22% in comparison to a DSSC with a sputtered-Pt CE (5.80%). This enhanced efficiency was attributed to the increased active surface area and the lower charge transfer resistance for I-3(-) reduction. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.036202jes] All rights reserved.